Logic : Jurnal Rancang Bangun dan Teknologi

The Effect of Sengon Wood Powder Particle Size and Composite Composition on The Performance of Non-Asbestos Brake Linings

Robby Ridwan — 2025-03-30

The purpose of this study was to determine the effect of particle size and composite composition on the mechanical properties of non-asbestos brake linings. This type of research uses quantitative experiments. There are 3 kinds of variables used, namely a) independent variables consisting of particle size and composite composition; b) dependent variables consisting of hardness value and wear rate value; c) controlled variables consisting of shore D durometer method and Wear Rate with 800 rpm, 120 seconds time, and 20 psi pressure. The data analysis technique uses the factorial anova method because it is to determine the effect of the interaction between particle size and composite composition on brake lining. Data analysis was carried out twice, namely hardness test data and wear rate tests. After that, the data obtained was processed using the Minitab application. The results showed that particle size and composite composition affect the hardness and wear of brake lining. Smaller particle size increases hardness, especially in specimens using Fe composition. The use of iron powder resulted in higher hardness. Iron powders with better mechanical properties showed lower wear rates. The interaction effect of particle size and composite composition on brake lining performance is that the interaction of the two independent variables has a significant effect on brake lining performance.

The Effect of Injection Pressure and Injection Temperature in The Compression Moulding Process on Flashing Defects of Shoulder Products

Moh Hartono — 2025-03-30

Plastic objects are everywhere: toys, household utensils, playthings, and cosmetic containers. One of the processes used was the plastic production process in the compression molding process to make a cover (shoulder) on the tube. Flashing defects are one of the biggest defects that can cause a product to fail in the assembly of shoulder extrusion tube products in PT. XYZ. This research was to determine the effect of injection pressure and injection temperature parameters on flashing defects in shoulder extrusion tube products. This research uses quantitative research and experimental research methods to collect data. Varying parameter settings carry out this method with an injection pressure of 4 bar, 5 bar, and 6 bar as well as injection temperatures of 250°C, 260°C, and 270°C. The results of the study show that both parameters have significant effects on the flashing defects in shoulder extrusion tube products. The combination of injection pressure of 4 bar and injection temperature of 250°C resulting in flashing defects of 0 mm or no defects.

Construction of A Thermoelectric Coolbox System With Ice Pack Modification for Mango Storage Based on The Internet of Things

Fauzan Amri — 2025-03-30

This study aims to design a thermoelectric system for a coolbox utilizing additional ice pack components for mango storage by leveraging a TEC1-12706 Peltier element based on IoT technology. Thermoelectric is an energy conversion technology that directly converts thermal energy into electrical energy and vice versa through thermoelectric materials. The system operates based on the Peltier effect, which generates a temperature difference between two sides of the material when an electric current is applied. Based on the test results, the developed thermoelectric system achieved a cabin temperature of up to 12.6 ºC within 60 minutes, according to the ideal storage temperature requirements for mangoes (12–15 ºC). The addition of an ice pack plays a significant role in accelerating the temperature reduction inside the cabin. The cold sink and heatsink components function effectively in absorbing and releasing heat to the environment. This system achieved a COP of 0.60 with an efficiency of 60%. The thermoelectric system has also been successfully integrated with IoT technology through the Blynk application, enabling users to monitor temperature and humidity in real-time via an internet-connected smartphone, thereby facilitating the control of mango storage conditions.

Analysis of Leakage Test Results on Flange-Gasket Piping System Simulator Device

Syamsul Hadi — 2025-03-30

Fluid leaks in piping installations often occur in the industrial sector which is detrimental due to the selection of gasket materials, flanges, and improper tightening torque of flange bolts. The fluids that are flowed can be clean water, palm oil with a fatty acid content at an acidity level (pH) of around 4, oil, solutions with a certain pH or fuel. The purpose of the simulator device analysis is to obtain data on the level of tightening torque of bolts-nuts on 1 inch pipe flanges-gaskets and the volume of leakage. The analysis method includes setting the working pressure of the fluid on the globe valve at 1 Bar, 1.3 Bar, and 1.5 Bar on the flange-gasket piping system simulator device, measuring the lowest tightening torque at which the fluid starts to leak to the highest at a condition where there is no leak at all, and two-way Anova analysis on the distribution data. The results of the study showed that the lowest bolt-nut tightening torque at 2 Nm for three M8 bolts-nuts as flange-gasket pair locks resulted in an average fluid droplet leakage of 120 ml/hour and at a torque of 4 Nm the leakage level was about a quarter of that, namely 36 ml/hour and finally at a torque of 5 Nm there was no leakage at all. Implications in industries that use fluid flow with sufficient tightening torque of nuts-bolts on flanges-gaskets can reduce-stop losses due to leakage that occurs in their piping systems.

Lean Ergonomic Approach to Ergonomic Risk Analysis for Workplace Assessment

Isana Arum Primasari — 2025-03-30

IKM NN Aluminum is a metal foundry that produces woks. Based on observations, it appears that the moulding workstation has the highest workload as the operators work in a standing position for 8 hours a day. In addition, the operator lifts a 35 kg mould. This results in un-ergonomic working postures such as excessive bending, head bending and twisting of the body, resulting in waste that has the potential to cause fatigue, physical injury and health problems. The aim of this study is to identify the factors that can cause motion waste, to assess the posture of workers during frying pan moulding activities and to analyse the health implications of the posture assessment. The approach used in this research is lean ergonomics, which combines the principles of lean manufacturing and ergonomics to identify and reduce waste. The methods used are process flow maps to determine the flow of production activities, REBA to identify non-ergonomic postures, and smartwatches for heart rate monitoring to measure worker fatigue. Based on the results of the study, the factor causing motion waste at the moulding workstation is due to the size of the frying pan moulding tool, whose height does not match human anthropometry. Work activities at the moulding station have a high REBA score of 11, which has the potential to cause occupational musculoskeletal disorders. The Pearson correlation test showed a significant relationship between the REBA score and the fatigue level of the workers as measured by heart rate.

Determination The Cooling Capacity of The Fan Coil Unit (FCU) in A Hotel Room - Based on Heat Transfer Analysis

Luh Putu Ike Midiani — 2025-03-30

Fan Coil Unit (FCU) with the appropriate cooling capacity is needed to obtain room thermal comfort. FCU installed based on the cooling load of the room. Cooling load is affected by room volume, material of : wall, floor, roof, equipment in a room, ventilation, infiltration, windows, outdoor air temperature and humidity, indoor air temperature and humidity. Appropriate and correct FCU installation will have an impact on the energy use of a building. Energy saving efforts are made when determining FCU capacity by calculating cooling load by analyzing heat transfer. This paper investigates and analyzes the amount of room cooling load using the CoolPack application. Calculation of cooling capacity using the CoolPack application is carried out after determining the thermal conductivity and material thickness, thermal resistance of the inner surface and outer surface of the wall, roof, floor, and heat transfer coefficient. Based on the results of calculations and analysis, it was concluded that the total cooling load was 3.58 kW. Furthermore, the FCU capacity to be installed must match the FCU capacity available on the market and be greater than the total cooling load in order to achieve the expected comfort. Proper and correct installation of FCUs will have an impact on energy use in a building is an effort to implement energy saving.

Mold Design for Injection Molding Machine Using Recycled Aluminum

Amadeus Renaldy — 2025-03-30

The use of aluminum is widely spread from beverage cans, car parts, airplanes, trains, and household furniture. This is due to its lightweight and good corrosion resistance. However, as a metal aluminum waste is difficult to be decomposed naturally. Aluminum metal takes 80 to 100 years to decompose. So the accumulation of untreated scrap aluminum can pollute the environment. One of the solutions is to recycle aluminum by melting and re-casting it into a new shape: a mold for polymer processing. The waste of beverage cans was cleaned from any dirt and adhesive. Then, they were turned into small parts by a crusher. The melting process was done at 650^oC. The molten aluminum was poured into a sand mould in the shape of mould of a tensile testing specimen. The recycled product can be used to prepare tensile testing samples of polymer or polymer-based composite with injection molding technique. To evaluate the quality of recycled aluminum, a hardness test was done with a value of 69.31 + 3.02 HB. This value is lower than first-use aluminum. This is due to a combination of microstructural changes due to repeated heating, the presence of additives and impurities, and the effects of heat treatment and open cooling. Metallographic testing was carried out to evaluate the microstructure of the material resulting from the smelting of scrap aluminum using sand molds. In this test, the etching solution used consisted of 100 ml of water and 20 g of sodium hydroxide. The results of the metallographic images on the recycled aluminum material show the presence of a stand-alone silicon (Si) element and an aluminum-copper alloy (CuAl₂).

The The Role of Aluminium Nitride as Reinforcement Material for Phase Change Materials (PCMS)

I Kadek Ervan Hadi Wiryanta — 2025-03-30

The improvement of thermal energy storage and management has become a significant focus in various industrial applications, including EV battery thermal management, solar energy storage, and high-power electronics. Phase Change Materials (PCM) are widely used for thermal energy storage due to their capacity to absorb and release latent heat. However, organic-based PCMs like paraffin have limited heat conductivity (~0.2 W/mK), limiting their efficiency. This research investigates the potential of Aluminum Nitride (AlN) as a reinforcing material to improve the thermal conductivity and stability of PCM composites. AlN has strong thermal conductivity (~300 W/mK), chemical stability, and oxidation resistance, making it a promising material for increasing PCM thermal performance. Several synthesis methods, including Carbothermal Reduction Nitridation (CRN), sol-gel, hydrothermal, and thermal plasma procedures, have been investigated to produce AlN nanoparticles with appropriate characteristics for integrating into PCM matrices. Furthermore, multiple dispersion strategies, including ultrasonication, surface functionalization, and surfactant-assisted dispersion, are studied to ensure uniform distribution and prevent sedimentation. The use of surfactants like Sodium Dodecyl Sulfate (SDS) and Sodium Stearoyl Lactylate (SSL) further improves dispersion and stability, preventing phase separation and maintaining long-term efficiency. In applications such as EV battery thermal management, AlN-enhanced PCMs demonstrate superior heat dissipation, reducing battery peak temperatures by 19.4% compared to conventional air-cooled systems. Further research is recommended to explore hybrid nanocomposites, optimize AlN particle size and morphology, and develop advanced dispersion techniques to maximize the efficiency of PCM-AlN composites.

Application of Anthropometric Data on Redesign of Lightweight Brick-Cutting Tools to Reduce Workers' Musculoskeletal Complaints

I Gede Bawa Susana — 2025-03-30

The work of cutting lightweight bricks manually with the help of cutting tools still leaves problems. Unnatural working postures are a form of problems faced by workers. This causes musculoskeletal complaints that have an impact on comfort at work. To overcome this, a redesign of the lightweight brick-cutting tool was carried out using worker anthropometric data. The redesign was carried out on the pedal switch and work chair because this caused complaints from workers. The results of the redesign reduced the musculoskeletal complaints of workers who did lightweight brick-cutting work by an average of 49.36%. This figure was obtained from measurements after working on the old and new tools. The decrease occurred from an average of 62.8 when using the old tool to 31.8 after the intervention. The study results can be used as a guideline for workers doing manual work to create a comfortable and sustainable working atmosphere.