Test Rig Design and Initial Silent Chain Noise Measurement

• Main Author: Laksono, Mugi
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/38397
• Institution: Institut Teknologi Bandung

Number of sold motorcycles in Indonesia has increased significantly in recent years. Indonesian Motorcycle Industry Association estimated that the number of motorcycle sales will reach 5.4 million units at the end of 2008. Economic crisis and the rise of oil price drive most Indonesian to choose motorcycle as their main transportation means, since it consumes less energy. In addition, it is easier to get through the traffic jam by motorcycle. One of industrial sector that supports motorcycle production is autopart industry. One of the main components of motorcycle that can be manufactured in Indonesia is silent chain. Its main function is to deliver torque from crankshaft to camshaft which is used to drive valve mechanism. The advantage of using silent chain rather than roller chain as a cam chain is that it is produces less noise and impact when chain parts are in contact with the sprocket. In order to support continuous development in silent chain design, one important parameter that has to be monitored is its noise. In order to perform noise measurement, a tailormade test rig is needed. In this research work, en existing silent chain elongation test rig is converted into noise measurement test rig. The rig is supplied by PT. FSCM Mfg Indonesia. After performing standard procedure, the third design is finally selected from three design alternatives. The prototype was manufactured in the workshop of Mechanics and Mechanical Construction laboratory. The test rig consisted of an insulated section, microphone, electric motor and inverter (to adjust the speed), belt transmission, and frame. The data acquisition system consisted of soundcard and a freeware data logging software. Data processing was performed using MATLAB. The analysis shows that dominant noise signals come from the silent chain and the frequencies agree with theoretical vibration signal.