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이창호(Changho Lee),박원식(Wonsik Park),이정근(Jungkeun Rhee) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
In general, customers prefer gasoline vehicle to diesel because of the noisy sound of diesel engine. So, many studies have been conducted to reduce the combustion noise of the diesel engine. According to the big progress of the combustion noise reduction technology, the mechanical noise form diesel engine is getting more noticeable. Therefore automakers should improve the mechanical noise as well as the combustion noise from diesel engine. The present study deals with the rattle noise from timing driving system of mid-size diesel engine, which is hard to separate from combustion noise. By using the angle domain analysis, the rattle noise source was defined as the scissors gear of the timing drive system. Although the scissors gear was used, unexpected rattle noise occurred from the gear during idle and low speed driving. From this study, we found that the pre-load of the scissors gear should be optimized to remove unintended rattle noise.
이창호(Changho Lee),김홍주(Hongjoo Kim),이정근(Jungkeun Rhee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Internal combustion engine noise is primarily composed of combustion and mechanical noise shares. There are many sources for mechanical noise in internal combustion engines. These can be categorized as being related to either the valvetrain(valves, timing chain, etc.) or the cranktrain(piston, connecting rod, crankshaft, etc.). These noises can be radiated due to the characteristics of mechanical structure and the quality deflection of the component. To minimize the noise due to the quality deflection, we can sort the good quality part controlling the factor that caused noise in the product process. This study shows that the chattering noise might be radiated by characteristics of the cam lobe profile. For improvement of the chattering noise, we find out root cause of it by NVH test and measurement of the cam lobe profile. From these results, we can find out the correlations between cam lob profile and noise degree(subjective evaluations). Then, we will be able to select the good quality cam shaft for chattering noise.
이한승(Hanseung Lee),이창호(Changho Lee),이정근(Jungkeun Rhee) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Nowadays, high efficient and low emission vehicle was developed due to the depletion of petroleum resources and solving the environmental pollution in the automotive industry. In addition to that, the quiet and comfortable vehicle has developed for deflecting customers concerns about NVH(noise, vibration, harshness). Shuffle mode is one of the common phenomena of the vehicle driveline NVH. Also, the vehicle shuffle can influence driveline clunk with manual transmission. The aim of this study is to reduce driveline clunk with the several influence factors. The moment of inertia of flywheel, gear ratios and characteristics of clutch disc are the key influencing parameters for driveline shuffle and clunk. In this paper, torsional vibration of driveline system has been simulated using AMESim program and experimented in a front wheel drive, manual transmission vehicle. The simulation result was compared with the test data. Based on the above simulation and test results, the optimal driveline system could be determined with robust NVH performance enablers when integrated into vehicle in early design stage of the vehicle.