Jurnal Teknik Mesin Indonesia

Defleksi Vertikal Poros Turbin Angin Multi Blade di Daerah Pedesaan Bagian III: Kaji Teoritik dan Numerik

2024-06-07T21:06:28-07:00

The multi-blade wind turbine is a type of wind turbine that has been used by salt farmers in Paccelang Village, Bangkala District, Jeneponto Regency, South Sulawesi Province. In operation, the turbine often experiences resonance due to excessive vertical deflection of the shaft. This article examines and identifies the parameters that cause vertical shaft deflection. Research was carried out theoretically and numerically. Theoretically, the research was carried out by entering the appropriate parameters into the described shaft vertical deflection equation. Numerically, research was carried out using autodesk inventor software. The parameters that cause excessive vertical deflection of the shaft and are sorted based on their contribution are reduction in shaft diameter, extension of the shaft, and increase in external load

Proses Produksi Soft Magnetic Composite (SMC) Berbahan Dasar Fe

2024-10-05T20:43:31-07:00

This study discuss in various production methods of iron-based Soft Magnetic Composite (SMC) and to identify the most effective production. The increase in carbon emissions and the need for alternative energy drive the development of electromagnetic technology, including the use of SMC in electric motors. The method used in this study is a literature review, by reviewing relevant articles from national and international journals. The results of the study indicate that traditional production methods and Additive Manufacturing (AM) are the two main methods used in SMC production. Among these methods, the traditional production method with Powder Metallurgy (PM) technology proved to be more effective in producing SMC with better quality and more efficient production processes. This research provides in-depth insights into various SMC production techniques and can serve as a foundation for future research in the development of electromagnetic materials.

Pengujian Konsumsi Energi Baterai pada Sepeda Motor Listrik Konversi Tipe Mid Drive 2 kW

2024-10-05T20:15:57-07:00

A convertible electric motorcycle is a motorcycle that has undergone a change from a fuel-driven motor to an electric motor. When testing on a converted electric motorcycle, the battery indicator shows a significant decrease when passing an uphill track. This study aims to calculate battery energy consumption on a converted electric vehicle using a BLDC motor with a 2 kW mid drive type, both without and with the addition of internal gear. The process of testing and collecting data from battery energy consumption on a converted electric motorcycle is carried out by road tests on a flat track and a track that has an extreme climb. The test results on a converted electric motorcycle without the addition of internal gear with a distance of 100 meters on a flat road are 2,016 Wh, elevation 15° of 3,909 Wh, elevation 28° of 4,449 Wh, and elevation 40° of 5,059 Wh. While the test results of the converted electric motorcycle with the addition of internal gear on a horizontal track amounted to 2,421 Wh, elevation 15° of 4,240 Wh, elevation 28° of 5,528 Wh, and elevation 40° of 5,599 Wh.

Pemanfaatan Serbuk Sabut Kelapa Sebagai Bahan Alternatif Pembuatan Kampas Rem Non-Asbestos Pada Sepeda Motor

2024-10-13T18:04:59-07:00

This study is an experimental study in the manufacture of composite materials with coconut fiber powder reinforcement from coconut waste and aluminum powder from industrial waste. From this study, the characteristics of composite materials will be obtained with variations in the composition of coconut fiber powder and aluminum powder as reinforcement with a polyester resin matrix. This study is considered necessary to find composite materials that are not only superior in mechanical properties, but also optimal and utilize waste materials in large quantities that require proper management so as not to cause problems. The manufacture of this composite material uses coconut fiber powder, aluminum powder and polyester resin with a volume ratio of 30% coconut fiber powder, 30% aluminum powder, 40% resin, 40% coconut fiber powder, 20% aluminum powder, 40% resin, 45% coconut fiber powder, 15% aluminum powder, 40% resin, 50% coconut fiber powder, 10% aluminum powder, 40% resin, 60% coconut fiber powder, 0% aluminum powder, 40% resin. The process of making this composite material uses a press method with a vertical force pressure of 2,500 kg with sintering at a temperature of 150oC for 30 minutes. The characterization carried out includes the hardness and wear of each material composition. The hardness value closest to the hardness value of the comparative brake pads is the KL45AL15 specimen with an average hardness value of 33.1 kg/mm² with a composition of 45% coconut fiber powder, 15% aluminum powder, and 40% resin. And in the results of the brake pad wear test, the wear value closest to the wear value of the comparative brake pads is the KL60AL0 specimen with a wear value of 0.00252. with a composition of 60% coconut fiber powder, 0% aluminum powder, and 40% resin.

Analisis Desain dan Pembuatan untuk Alat Uji Shock Absorber Berbasis Mikrokontroler

2024-07-17T19:31:43-07:00

A microcontroller is one of the most important electronic devices in the electronics industry. The research aims to design, develop and analyze innovative test devices to evaluate shock absorber performance. The test equipment is based on the use of microcontrollers and state-of-the-art sensor technology as well as providing accurate measurements and effective solutions to analyze shock absorber retardation characteristics. The process uses two variables, the time and the value of the deflection. There are two such variations that are used to carry out the data collection experiment on the shock absorber test device.The results of this study are expected to be able to provide real-time values or parameters on electronic devices for a national standard shock absorber test device capable of being an automatic reader for a good shock-absorber test.

Pengaruh Ulir Pada Lubang Nozzle dan Karakteristik Api Pembakaran Berbahan Bakar Lpg

2024-09-19T19:21:05-07:00

Given Indonesia's growing population and economic development, the country is experiencing a greater need for fuel. There are now a number of alternative fuels available to lessen the ongoing need on fuel oil. One of the most affordable, cleaner, and readily available fuels worldwide is liquefied petroleum gas, or LPG. The geometric design of the burner, the flow dynamics contained in the non-premix flame flow structure and its function to stabilize the combustion process play an important role in the mixing process between fuel and air. The purpose of this research is to ascertain how nozzle thread changes affect the flame characteristics of burning LPG (liquified petroleum gas) fuel. In order to create an effective and efficient burner design, thread variations can be used to establish the properties of the diffusion combustion flame, such as flame stability and combustion temperature. Data collecting findings indicate that nozzles with threads have a greater temperature value than nozzles without threads. The proportion of.

Analisis Radiography dan Macro Structure Baja Karbon EH36 dengan Grade A Terhadap Hasil Pengelasan FCAW Variasi Ampere

2024-10-24T00:32:04-07:00

Ship superstructure or commonly called superstructure in welding fabrication found problems arising from the welding process. Problems caused by welding such as defects on the surface of the weld and defects in the weld. Defects inside the weld require radiography and macro structure testing to see indications that arise such as porosity, slag inclusion and incomplete fusion. The purpose of this research is to determine the results of Flux Cored Arc Welding (FCAW) between Grade EH36 carbon steel material and Grade A with V Groove connection type and for backing material using ceramic strip without gouging. The research process that has been carried out includes welding the two materials with the Flux Cored Arc Welding (FCAW) method using parameters 160 A, 200 A and 250 A. Non Destructive Test (NDT) testing used is Radiography Test while Destructive Test (DT) testing is Macro Structure Test, both of which aim to find indications of defects in the weld. The conclusions found after the Radiography and Macro Structure tests were found no indication of defects in the weld metal at parameter variations of 160 Ampere, 200 Ampere and 250 Ampere.

Pengaruh Preventive Maintenance Terhadap Performa Unit Excavator Komatsu PC 200-8 di PT PP Presisi Jobsite Main Hauling Road PT Hengjaya Mineralindo

2024-11-05T14:57:36-08:00

Excavators are multi-purpose equipment that has various functions. To keep the excavator in top condition even though it’s used continuously, it’s necessary to carry out preventive maintenance on the excavator unit. Preventive maintenance is maintenance carried out on a unit to prevent unexpected damage and to find conditions that could cause damage when using the unit. The reality in the field is that there are many delays in implementing preventive maintenance on excavator. Delays that occur will have an impact on the excavator both in terms of unit condition and unit productivity. This study aims to analyze the effect of preventive maintenance on excavator units in the period February to June 2023 using the Physical Availability, Mechanical Availability, and Effective Utility calculation methods, as the potential lost costs that the company will incur if there is a delay in preventive maintenance on the excavator unit. The analysis results show that units with timely preventive maintenance have a higher average value of 28% for PA, 31.7% for MA, and 24.8% for EU. Delays in preventive maintenance affect the condition of the unit, where the lifetime of a component should be used longer. The estimated losses experienced by the company were estimated at IDR 433,700,000 per unit during the data collection period, from the total units that experienced delays in preventive maintenance.

Pengaruh Kuat Tekan dan Daya Serap Air Laut Pada Material Komposit Sandwich Serat Sabut Kelapa

2024-11-21T19:22:13-08:00

The need for boards as a material for furniture is increasing, therefore alternative materials are needed to replace wooden boards, such as sandwich composite boards. Coconut is a tropical plant that has long been known by Indonesian people. Coconut is one of the plants that can be used as a composite board, namely coconut fiber. This research aims to make composite boards from coconut fiber to determine the compressive strength and absorption capacity of sea water. The materials for this research are coconut fiber and polyester resin. Coconut fiber is a waste that is rarely used so the waste can become serious waste. This research uses the Compressing Molding method at room temperature where the mold is loaded. In this research, compression testing uses ASTM D 659 standards and seawater absorption testing uses ASTM D 570 standards. The results of this research show optimal conditions at a volume fraction of 20% with a core thickness of 6 mm, namely 8,230 MPa in compression testing and 25% thickness. The 8 mm core in the Sea Water Absorption Capacity test had the lowest absorption capacity at 0.16%.

Pengaruh Kandungan Serbuk Sekam Padi, Serbuk Kulit Kacang Tanah, dan Serat Ijuk Terhadap Kekuatan Impak dan Mikrostruktur Komposit Matriks Resin

2024-12-04T23:04:14-08:00

This study is driven by the utilization of organic materials of rice husk powder, peanut shell powder, and palm fiber for the needs of environmentally friendly composite materials. This research seeks to ascertain the largest percentage within the impact test resistance of each material and the characteristics of the composite microstructure. This research was conducted using the experimental test method at Mercu Buana University’s Mechanical Engineering Laboratory, where the examination is carried there was an utilizing the Charpy to test the impact method, while the microstructure characteristics were carried out using optical microscopy (OM). The experiment was employed in this investigation by dividing into 9 composition variations on the impact test specimen by manual molding using a specimen mold and drying it under sunlight for 1-2 hours, after which an impact test was conducted in order to assess the durability of the specimen and analyze the microstructure of the specimen. Based on the studies that have been conducted, the specimen with the highest toughness is combination B which has a toughness value of 20 kJ/m2

Kekuatan pergelangan kaki prostetik pergelangan kaki dengan bahan baja dan aluminium

2024-12-04T23:10:13-08:00

Leg prosthetics as a device to increase the mobility of people with disabilities need to be supported in their development, especially in terms of comfort. Modifications to make prosthetics more comfortable to use are by utilizing the elastic properties of springs and base plate materials and dampers. This study analyzes the strength of steel and aluminium prosthetic base components in bearing the dynamic load of user's body. The analysis uses computational techniques with the finite element method. Computational results show that the most critical part of prosthetic, i.e. the base, is safe with maximum working stresses of 31,56 MPa for steel and 44,03 MPa for aluminium. Both materials are able to withstand the working stress.

Analisis kekerasan material alternatif kampas kopling berbahan komposit resin diperkuat limbah kaca dan serat alami

2024-08-26T00:42:24-07:00

Clutch discs in motor vehicles are commonly made from asbestos, a material that is hazardous and environmentally unfriendly. Therefore, there is a need for more eco-friendly alternatives by utilizing waste materials, such as glass waste and natural fibers. This study aims to evaluate the use of resin-based composites reinforced with natural fibers and glass waste as alternative materials for clutch discs. We tested various combinations of resin, natural fibers (coconut fiber, coir fiber), and glass powder to determine which composite offers the best hardness properties. Samples were divided into two groups with different compositions and tested for hardness using the Rockwell method. The results showed that the composite with a composition of 20% glass waste powder, 20% coir fiber, 20% glass powder, and 40% resin achieved the highest hardness, with a Rockwell hardness value of 70 HRB, which closely approaches the standard hardness for automatic transmission clutch discs.This research reveals the significant potential of using natural fibers and glass waste as sustainable and high-performance composite materials. The findings contribute to the development of green composite materials and offer a more environmentally friendly alternative in the automotive industry.

Pengaruh fraksi volume terhadap kekuatan tarik hibrid komposit serat pelepah pisang - serat kaca bermatriks epoksi

2024-09-11T20:19:04-07:00

Banana leaf is a part of the banana that is rarely utilized and even used as waste by the Indonesian people. Inside the banana leaf there are fibers that can be used as a hybrid composite reinforcement material. The choice of glass fiber is because it has good strength value, light weight, and low price. This study has a goal to determine the effect of volume fraction on the tensile strength of hybrid composites of banana leaf fibers and epoxy-matrixed glass fibers. The fibers were soaked in 5% NaOH water. The volume fractions used were 40%, 50%, and 70% fiber. The specimen size standard used is ASTM D638-14 and the composite manufacturing method uses the Hand lay-up method. After conducting the tensile testing process, it was found that the 70% volume fraction had the highest tensile strength value with a stress value of 80.2 MPa and a strain value of 0.07%.

Studi Kasus Perancangan Rangka Motor Listrik Tipe Naked Bike Menggunakan ANSYS

2023-09-14T07:09:32-07:00

The function of the frame on the electric motorcycle is to support the rider's load and where several motor components are combined, and also acts as the basic form of the motorcycle itself. The design of the electric motorcycle frame design also needs a finite element analysis. The analysis computes and produces formulas to estimate the actions that can be performed on the object, where this method involves dividing the structure into smaller elements connected by nodes or in other words, the discretization of elements. The objective of this research is to analyze the yield strength level of the electric motorcycle frame design under static loading conditions in accordance with the load safety standards of two-wheeled vehicles in Indonesia. The subject of this research is an electric motorcycle frame design with a naked bike frame type. The material used in the frame is aluminum alloy 6061 T6. The total loading during simulation is 265 kg. The quality of element discretization obtained in the electric motorcycle frame design is 0,278 with the size of each element of 5,5 mm. The maximum von Misses stress obtained is 125,3 MPa with a maximum deformation of 0,08618 mm and the safety factor is 2,154. The results of this study provide a statement that the electric motor frame design is able to withstand the load during simulation.

Analisis Aspek Ergonomi pada Prototipe Alat Peraga Pendidikan Batang Truss untuk Mata Kuliah Kekuatan Material

2024-10-28T21:22:34-07:00

Educational aids are very helpful in improving students' understanding of abstract subjects such as exact sciences. The Strength of Materials (SOM) course in the Manufacturing Design Engineering Department is supported by practical activities in the SOM studio using teaching aids, including truss bar tests. However, the currently used teaching aids have been complained about by students due to their complexity. Therefore, the development of a more user-friendly truss teaching aid prototype is needed. This article focuses on the evaluation of the impact of the developed teaching aid on its suitability for use in easier operations. The method used is observation techniques and interviews with students who have tried the previous teaching aids and the prototype being developed. The results showed that the prototype developed was better than the previous tool, because the procedure for using the tool was simpler and the duration of disassembling and assembling the test specimens was faster. Thus, it can be stated that the developed truss test teaching aid prototype is easier for students to use than the previous tool used in the SOM studio. Therefore, the development process and performance tracking of the developed prototype can be carried out at the next development stage.

Rancang Bangun Sistem Transmisi Belt dan Pulley Pada Mesin Crusher Plastik High Density Polyethylene (HDPE)

2024-11-13T15:53:49-08:00

High-Density Polyethylene (HDPE) plastic is one of the most widely used types of plastic, commonly found in products such as bottles, containers, and pipes. However, if not managed properly, HDPE plastic waste poses a significant environmental challenge. An HDPE plastic crusher machine is a tool designed to shred HDPE plastic waste into fine powder, facilitating recycling and its use in composite materials. The objective of this research is to design and construct an efficient and effective HDPE plastic crusher machine. The HDPE plastic crusher machine features a rotary knife and a robust steel frame. The rotary blade is crafted from a hard, sharp material, while the steel frame provides support for the machine's body and drive motor. The machine is powered by a 3 HP electric motor operating at a speed of 1400 RPM. Power transmission is achieved through a belt and pulley system. The machine functions by transferring power from the main 3 HP electric motor to the shaft of the crusher knife. Direct testing of the HDPE plastic crusher machine was conducted using shredded HDPE plastic. The testing process was divided into two types: one without HDPE plastic and one with HDPE plastic. The results indicated that the machine produced 100 grams of fine powder in 30 minutes. The belt and pulley transmission system demonstrated a maximum tension of 216.5 N and a working tension of 176.4 N.

Perhitungan Teoritis Kinerja Mesin GLP III Sport Dibandingkan dengan Hasil Dynotest

2024-08-29T21:21:49-07:00

In reciprocating internal combustion engines, the air-fuel mixture significantly influences the thermodynamic changes in the engine and the performance of its components. This study aims to compare the performance of standard and modified engines using Pertalite fuel. The experimental results are also compared with theoretical calculations to evaluate the impact of the modifications on engine performance. The method used in this research is experimental, conducted on both standard and modified Honda GLP III Sport engines. Measurements were performed using a dynotest and unloaded stop tests to obtain data on power, torque, engine speed (rpm), and specific fuel consumption (SFC). The results show that the modified engine exhibits significant increases in power and torque, along with a reduction in SFC compared to the standard engine. At an engine speed of 5000 rpm, the power output of the standard engine is 4.35 kW, while the modified engine reaches 9.11 kW, representing a 109.42% increase. The torque produced by the standard engine is 8.32 N.m, whereas the modified engine achieves 17.4 N.m, indicating an increase of 109.13%. The specific fuel consumption of the standard engine is 482.896 g/kW.h, whereas the modified engine has a specific fuel consumption of 323.38 g/kW.h, showing a decrease of 33.03%. In conclusion, the modifications made to the Honda GLP III Sport engine positively impact its performance, with significantly higher power and torque and improved fuel efficiency. These modifications are proven to enhance engine performance based on both experimental and theoretical results.

The Effect of Funnel Angle on Density, Hardness, and Calorific Value in Briquette Pressing Machine

2024-08-22T20:14:27-07:00

Efforts to find new energy sources continue, including Renewable Energy Sources (RES). Biomass is an alternative source of renewable energy and one example of biomass is briquettes. Briquettes are solid fuels made from renewable organic materials derived from plants such as mangrove wood, coconut shells, and palm kernel shells. Thus, briquettes can serve as an alternative energy source to replace fossil fuels like coal. In this study, briquettes were produced using a briquette pressing machine with a screw conveyor method. The briquette materials used were palm kernel shell charcoal dan mangrove wood charcoal, with variations in funnel angles to observe the impact on briquette quality. The funnel angles tested were 55̊, 60̊ and 70̊. Three tests were conducted : density, hardness and Water Boiling Test (WBT),with five data points for each test. The best results were obtained for mangrove wood briquettes at a 55̊ funnel angle, with an average density of 1,12 grams/cm³, average hardness of 38,34 kg/cm² and average WBT value of 5.785,02 kJ/kg. Funnel angle significantly influenced the quality of the produced briquette.

Advanced Modeling and Static Load Simulation of Chair Design: A SolidWorks-Based Approach

2025-02-17T20:08:22-08:00

In-depth analyses are the purpose of this writing, which studies the part of Computer-Aided Engineering (CAE) in stool structural examinations. The focus is on numerous inquiries regarding the mechanical properties of varied substances, such as balsa, oak wood, or alloys, including alloy steel and AISI 304 stainless steel. The SolidWorks application made it possible to run simulations; repeated attempts were made to quantify displacement, stress, and strain. The Von Mises model is used for stress, URES was the tool most used to examine displacement, while for recording strain, the method used was estrn. Assessing mechanical behavior is the goal concerning various materials, which are viewed as a stepping stone to significantly improving the furniture design process's material selection strategies. The results of the study showed significant differences between the four materials. High stress and considerable changes were seen in oak and balsa wood; their biggest total displacement was recorded vertically. AISI 304 and alloy steel, on the contrary, showed impressive mechanical resistance, with lower stress and slightly bigger deformation occurring. In scenarios demanding rigidity and structural stability, this is suitable, emphasizing the utmost importance. Stressed is the designing of chair-making materials that strive to achieve usage-related functionality and aesthetic satisfaction

Pengujian dan Pengembangan Driving Cycle di Area Solo untuk Simulasi Kinerja Baterai Pack Kendaraan Listrik

2025-02-17T20:07:12-08:00

Driving cycle testing is a crucial step in measuring the performance of battery electric vehicles (BEVs), especially in terms of energy efficiency and battery design optimization. This article discusses the driving cycle testing conducted in the Solo area, Central Java, to obtain a route that can be used in battery pack testing. The proposed driving cycle testing data shows good results, where the generated route pattern closely resembles the data in the model, with a difference of less than 3% between the field data and simulator data. The testing scheme using a 14.8 A load has met the applicable testing standards. Field test data recordings show an energy consumption value of 22.3 Ah, while simulation data shows a value of 22.8 Ah, with a difference of 2.2%. These recorded results provide consistent and relevant data to be used as input in electric vehicle simulators, allowing for more accurate simulations of battery performance under various real-world operational conditions. Therefore, this driving cycle data serves not only as a measure of vehicle efficiency but also as a valid basis for evaluating battery performance in simulator-based testing.

Rancang Bangun Sistem Transmisi Poros Pisau Penghancur Pada Mesin Crusher Plastik High Density Polyethylene (HDPE)

2025-03-18T19:19:08-07:00

The amount of plastic waste continues to rise alongside the increasing use of plastic packaging products. To mitigate the plastic problem in Indonesia, one approach is to recycle HDPE plastic waste into powder that can be utilized for composite materials. The initial step in producing powder from HDPE plastic waste involves shredding the HDPE plastic into small flakes. These plastic flakes are then ground into fine powder. The HDPE plastic crusher machine is powered by a 3 HP electric motor and operates at a rotational speed of 1400 rpm. The design of the blades on this machine features sharp and wide edges, with a total of eight blades. Additionally, the machine body is designed with a wider shape to optimize the plastic crushing process. The transmission system used to transfer rotation consists of a pulley, V-belt, and shaft. Proper planning of the shaft is essential to determine the appropriate diameter for the HDPE plastic crusher machine. Based on the planning results, the shaft diameter selected is 25 mm, with a minimum required diameter of 16.24 mm. The final rotational speed of the crusher blade shaft is 2800 rpm, with a torque of 13,410 N·mm applied to the shaft.

Homogenization of Bricket Dough: A Study on Horizontal Helical Ribbon Mixer

2025-03-25T23:57:42-07:00

The design of this briquette dough mixer machine is designed to mix briquette dough with a horizontal stirrer, the mixing knife used is a helix with two blades with different directions and sizes. This mixing machine uses a 1 HP AC motor with a motor speed of 1,400 Rpm, the engine also uses a 1:20 ratio gearbox, the rotation is obtained at 70 Rpm then reduced again to 50 Rpm using the pulley ratio so that the rotational speed achieved is 50 Rpm. The capacity of the mixing tube made is 10 kg in one mixing process, to be able to reach a capacity of 10 Kg requires matching the composition of the dough which consists of 5.75 Kg of charcoal, 0.287 Kg starch and 4.025 Kg water. In the process of mixing the dough, the starch is first dissolved in hot water, then slowly poured into the drum which has been filled with charcoal powder. Data collection was carried out by comparing 3 time variations, namely 10, 20 and 30 minutes. After mixing, the dough from each time variation was divided into 4 samples weighing 2.5 kg each and placed in different places. We can compare each time variation in terms of shape, texture and color so that we can analyze it. It was found from field experiments that to produce quality briquette dough, the mixing time was 30 minutes with an average power consumption of 2.49 KwH.

Karakteristik Uji Tarik dan Struktur Makro Plastic Waste dan Serat Bambu

2025-03-15T20:38:26-07:00

Plastics are widely used in wrapping food, drinks, and household furniture. This research uses materials in the form of shredded HDPE plastic, PET plastic seeds, and ori bamboo fiber. The composition of the mixture used is based on the weight fraction of a 65 gram specimen of mixed material. The main matrix of the mixture was HDPE; PET was added to increase stiffness; and bamboo fiber, as a natural reinforcement that strengthens the bond between components. Which strengthens the bond between the components. Results tensile test results showed the highest average value in specimen composition 1, which is 533.37 N with a tensile stress of 27.77 MPa. In specimen composition 5, the average value of the tensile test was 409.33 N and a tensile stress of 21.31 MPa. Due to the stronger nature of HDPE to bind the bamboo fibers, the tensile strength of the bamboo fibers will increase as the PET content decreases. With decreasing PET content. Macro test results showed that many air bubbles were trapped in the center of the tensile test sample which were not visible from the surface. not visible from the surface. PET plastic is not well mixed in the sample, while the bamboo fibers were well mixed in the test sample.

Perancangan Checking Fixture Sebagai Alat Inspeksi Komponen Underwing Tank Enclosure Pada Pesawat Fixed-Wing

2025-04-15T00:23:14-07:00

The underwing tank enclosure is a component of fixed-wing aircraft that was originally manufactured by a Spanish aerospace company, so all the tools and references were not available to the Indonesian aerospace company, one of which is the inspection process tool. This study aims to design a checking fixture to meet requirements and support the production process of the underwing tank enclosure component, ensuring efficient and compliant inspection processes for the Indonesian aerospace company. The research utilized CAD software to design the checking fixture and CAE software to analyze the structural strength of the main fixture frame using the Finite Element Method (FEM). The results include a checking fixture design employing checking pins to validate the dimensional contours of the underwing tank enclosure against specified geometric specifications. Structural strength analysis revealed a maximum Von Mises stress of 1,1119 MPa, a maximum deformation of 0,0074696 mm, and a minimum safety factor of 211,34, while the checking plate deformation analysis shows that the longitudinal checking plate component only experiences a maximum deformation of 0,0010525 mm, confirming that the main structural frame of the checking fixture and checking plate components are safe for use.

Keywords: Design, Checking fixture, Inspection, FEM.

Strength Analysis of Light Vehicle Rim Design Using Finite Element Method: An Innovative Approach for Safety and Efficiency

2025-04-15T00:28:49-07:00

Car wheels are critical components responsible for bearing vehicle loads and ensuring stability during driving. This study aims to analyze the strength of car wheels using the Finite Element Method (FEM) with Solidworks 2020 software. The analyzed parameters include von mises stress, equivalent strain, displacement, and safety factor. Simulation results show a maximum stress of 1.978 × 10⁵ N/m² and a maximum strain of 2.449 × 10⁻⁶, within the safe limits of aluminum alloy material. A maximum displacement of 5.687 × 10⁻⁴ mm indicates sufficient structural stiffness of the wheel. The minimum factor of safety, 1.087 × 10³, suggests a high tolerance against failure. This study confirms that the wheel design is safe, efficient, and meets safety standards. The finite element method effectively identifies critical areas and optimizes the design before production. Validation through physical testing is recommended to ensure alignment with real-world conditions.

Studi kekuatan kekerasan dan kekuatan impact pada komposit diperkuat serat sansevieria dengan variasi penambahan amilum 6%-10%

2025-03-25T23:49:23-07:00

Natural fiber reinforced polymer composites have become one of the areas of research that attract attention because of their superior and environmentally friendly mechanical properties. This study aims to determine the effect of adding starch 6%, 7%, 8%, 9%, 10% on the characteristics of the mechanical properties of composites reinforced with sansevieria fibers. The manufacture of this composite uses the hand lay up method with a fiber weight fraction volume of 30% and alkali treatment of sansevieria fibers with a concentration of 5% NaOH for two hours. This alkali treatment aims to reduce the content of lignin, hemicellulose, and dirt layers on the fiber surface. Testing the characteristics of mechanical properties in this study is the impact test and Shore D hardness test. In the good impact test results without the addition of starch, because the increasing concentration of starch can reduce the density of molecular bonds in the polymer matrix, so that the bond strength between molecules decreases. While the results of the Shore D hardness test are better adding starch, because starch acts as a filler that reduces local deformation on the composite surface when tested with an indenter on the Shore D hardness tester.

Study of the effects of active and passive control treatments on vehicle drag

2024-11-05T14:34:05-08:00

Increasing fuel consumption efficiency and controlling fuel price increases and environmental impacts challenge manufacturers to think outside conventional vehicle systems by focusing on aerodynamic drag. Various efforts can be made to reduce aerodynamic drag, one of which is by delaying flow separation. Separation delay can be done by providing passive control treatment in the form of dimple and spoiler and active control in the form of blowing. This study aims to analyze aerodynamic drag by applying dimple, spoiler, and blowing to the upper side of the rear of the vehicle model using a computational method. Computational tests are carried out at an upstream speed of U0 = 20 m / s. Flow pattern analysis is presented to support the results of the drag coefficient (Cd) obtained. The results of the analysis show that the application of dimple, spoiler, and blowing to the upper side of the rear of the model successfully delays separation and reduces backflow and reduces the amount of drag (Cd).

Efek Carburizing Terhadap Sifat Mekanik Limbah Drum Oli sebagai Bahan Baku di Industri Kecil Pande Besi

2024-10-04T20:02:05-07:00

Oil drum waste, cheap but not yet optimally utilized. This waste has the potential to be a substitute for carbon steel base material for making metal crafts through heat treatment. This research aims to determine the effectiveness of the influence of beef bone and barium carbonate as an energizer on the sharpness of coconut shell charcoal carbon diffusion into used oil drum waste after the pack carburizing process. The used drum test specimen with a content of 0.0379% C, was placed in a carburizer environment of coconut shell charcoal powder mixed with 20%, 25%, and 30% beef bone meal energizer and 20% barium carbonate (BaCO3) heated at a temperature of 800 0C, 850 0C and 900 0C with a holding time of 30 minutes immediately quenched. The effectiveness of carbon diffusion and macro structure were evaluated using a "Desktop Metals Analyzer" and an optical microscope, while the hardness was "Micro Vickers Hardness Tester" at a load of 200 gf with a pressing time of 5 seconds. The test results show, for a mixture of 1kg of carburizer, energizer 30%, 25%, 200%, and barium carbonate 20%, the carbon element has increased to 0.442%C, 0.335%C, and 0.322%C from the original 0.0379%C, while the hardness becomes 1043.73 VHN0.20, 964.03 VHN0.20, and 885.55 VHN0.050, from the initial hardness of 150.68 VHN0.050 in a matrix of martensite and bainite with other phases ferrite and pearlite.

Analisis Efektivitas Produksi dengan Metode Total Productive Maintenance (TPM) Pada Mesin Ring Spinning (Studi Kasus : PT. XYZ)

2025-04-21T16:26:57-07:00

PT. XYZ is a textile manufacturer specializing in polyester/cotton-blended fabrics and yarns. A critical machine in its production process, the ring spinning machine, frequently experiences maintenance issues and breakdowns, resulting in decreased productivity. Production effectiveness was analyzed using the Total Productive Maintenance (TPM) approach, with Overall Equipment Effectiveness (OEE) and the Six Big Losses as key indicators. This study aims to calculate the OEE, identify the most significant losses affecting machine performance, and determine the main factors contributing to low productivity. Results show that the average OEE from June 2024 to January 2025 was 85%, with Availability at 93%, Performance at 92%, and Quality at 99%. Although these values are within a good range, improvements are needed to reach optimal efficiency. The dominant losses were Reduce Speed Losses and Idling & Minor Stoppages (each 7%), followed by Set Up and Adjustment Losses (5%). These were mainly caused by slow production, minor disruptions, and inefficient setup times. Strategic recommendations were proposed to enhance operational efficiency and reduce downtime.

Reliability-Centered Maintenance (RCM) Approach in Fleet Maintenance To Enhance Transportation Efficiency and Safety

2025-03-18T19:21:28-07:00

Efficient and reliable public transportation systems, particularly bus services, played a crucial role in regional mobility and economic development. However, maintenance challenges impacted service quality, as seen in PT. SPS – Solo’s Scania fleet. Traditional reactive maintenance methods proved insufficient, leading to increased operational costs and unexpected failures. This study applied Reliability-Centered Maintenance (RCM) to optimize maintenance policies, identifying critical components and establishing effective strategies. Failure Mode and Effect Analysis (FMEA) revealed the brake chamber as the most critical component, followed by the stabilizer and tie rod/slack adjuster. Maintenance interval analysis recommended Time-Directed (TD) intervals from 26,090 km to 35,084 km and Condition-Directed (CD) intervals from 25,900 km to 70,168 km, based on component degradation patterns. Cost analysis highlighted air bellows as the highest-cost component (Rp. 2,350,000), while brake chambers had the lowest cost (Rp. 150,000). The study demonstrated that RCM improved fleet reliability and reduced maintenance costs. Implementing structured maintenance schedules, training programs, and condition monitoring systems was recommended. These findings provided a foundation for enhancing longdistance bus operations and could be adapted for other transportation sectors to achieve cost-efficient and reliable fleet management.

Digitalization of TQM: From Manual to Smart Quality System

2025-04-20T22:08:08-07:00

The digital transformation of Total Quality Management (TQM) represents a paradigm shift from traditional manual practices to data-driven, intelligent quality systems. This systematic literature review (SLR) examines the trajectory of TQM digitalization by analyzing 52 peer-reviewed articles published between 2011 and 2023. The review explores three main themes: (1) the transition from traditional to digital and intelligent quality tools; (2) the enablers and barriers to implementing digital TQM, including technological readiness, organizational culture, and data infrastructure; and (3) the evolving role of quality professionals in the era of Industry 4.0. Findings show that while automation and digital tools improve efficiency and decision-making, successful integration requires strategic alignment of human, technological, and managerial capabilities. The study also highlights gaps in empirical evidence regarding the long-term impact of smart quality systems on organizational performance. This review contributes to the understanding of digital quality transformation, and provides a conceptual framework to guide future research and practical implementation in quality management.