Sifat Mekanis pada Kompon Karet Alam Variasi Campuran Serbuk Ban Bekas untuk Aplikasi Bantalan Mesin

Rubber is a good material used for engine mounting because it has good elastic and damping properties. To obtain good mechanical and damping properties, fillers can be added such as carbon black, nylon powder and silica. In this study used used tire crumb as filler material. With the method of adding used tire powder 0 phr, 6 phr, 12 phr, 18 phr sequentially on natural rubber compound A, B, C, and D. Rubber compounds made in this process are tested to determine the mechanical properties and Dumping vibrations. Tests carried out namely, strength and elongation at break, hardness, tearing strength, flex crack resistance and dumping vibration ( ability to reduce acceleration of vibration propagation ). The test results show a decrease in the strength of 21.7 N / mm², 20.9 N / mm², 20.3N / mm², 20.5 N / mm², and also at the elongation at break test with an average of 430%, 415%, 423%, 425%. Sequentially on A, B, C and D vulcanizates. Trends of hardness test chart to increase 61 Shore A, 63 Shore A, 64 Shore A and 65 Shore A, while the tear strength also shows an increase and decrease with an average yield of 12.5 N / mm², 12.6 N / mm², 11.3 N / mm², 13.3 N / mm² on A, B, C and D vulcanizates.

Studi Komparasi Performa Mesin SI Berbahan Bakar Pertalite dan Plastic Pyrolysis Oil (PPO)

This study aims to evaluate the performance of gasoline engines using pure fuel (pertalite) with plastic pyrolysis oil (PPO) fuel from low-density polyethylene (LDPE) plastic waste. The test was carried out on a four stroke, single cylinder test bed machine. The research begins with the manufacture of fuel from low-density polyethylene (LDPE) plastic waste using the pyrolysis method. The performance parameters evaluated are torque, power and specific fuel consumption (BSFC). The results of the test show that the engine performance using LDPE type plastic waste fuel is relatively lower than pertalite. However, the consumption of LDPE fuel is lower than pertalite.

Studi Numerik dan Eksperimen Aerodinamika Airfoil NACA 24112

This study aims to investigate experimentally and numerically the characteristics of the NACA 24112 airfoil. This study focuses on investigations of lift coefficient (CL), drag coefficient (CD), and CL / CD ratio and pressure, including flow visualisation around the airfoil. The study was conducted at an angle of attack ranging to -15°-20° and various Mach number at 0.0728 and 0.0809. The experimental test used a test specimen with a span dimension of 20 cm and a chord of 10 cm with an open wind tunnel. A total of 376,500 square elements with values ∆y + to 9.6 were successfully generated to achieve the accuracy of the simulation. The results showed that the CL and CD values obtained from the experimental and simulation results showed a similar trend. The CD value of the experimental results is greater than the simulation results. The CL and CD values will increase with increasing flow velocity and increasing the angle of attack. A stall occurs at an attack angle of 20°.

Studi Eksperimental Pergerakan Temperatur Radiator Terhadap Putaran Mesin (RPM) dengan Kecepatan Kipas Constant

The research aims to evaluate the engine rotation (rpm) against changes in radiator temperature. Radiator used is compact heat exchanger tube and fins type. The study was conducted using an experimental method on a BMW E.36 car with a stop state. The research scheme we use consists of radiator water reservoir tanks, water pumps, and radiators. Measuring instruments used are anemometer, thermocople, stopwatch and reader. Data retrieval is carried out at the radiator entrance temperature, radiator exit temperature and the temperature on the radiator wall that hits the fan. In this study we did variations of engine rotation (rpm) of 1000, 1500, 2000, 2500 and 3000 rpm. The results showed that in the use of fans at a speed of 6.5 m / s able to throw heat into the environment well, this proved to be obtained the highest temperature value at the 10th minute of 57.5 oC at a fan speed of 3.5 m / s. Meanwhile, in the 10th minute the lowest temperature was obtained from a speed of 6.5 m/s of 40 oC.

Analisis Tingkat Efisiensi pada Sistem Pengkondisian Udara Gedung Auditorium di Universitas Muhammadiyah Pontianak

Observing various events such as the angle of sunlight, measuring the temperature of the outer wall, various accessories available and the types of activities carried out. Then do the calculations with CLTD (Cooling Load Temperature Difference) method based on ASHRAE 1997. The results obtained are cooling loads from such as brick walls with plaster layers, glass, aluminum alloy roofs, concrete and ceramic floors, lamps, occupants, electronic equipment. and 1,500 maximum number of people in the Pontianak Muhammadiyah Auditorium Building was 349.772,358 Watt or 132,60 PK. The current installed air conditioner has a capacity of 40 PK, so it needs 92,6 PK PK more or 19 units of cooling equipment, each of which has a capacity of 5 PK so that cooling in the room is more efficient.