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대형 승용차량용 연료펌프의 소음특성에 대한 실험적 고찰
사종성(Jongsung Sa),강태원(Taewon Kang) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.5
The comfort and quietness of vehicle has been improved greatly due to the development of technology in automobile industry. Some of noise reductions, for example, are driven by the improvement in the power-train system. Due to better in all performance, it is required to reduce more noise in automobile components. One of them is related to the fuel pump system including a pump and a tank. Therefore, this study is focused on investigating the characteristics of fuel pump and fuel tank first, and then comparing the data before and after installation of fuel pump system in a testing vehicle. Additionally, the measured data will be analyzed to identify the problems and provide knowledge to reduce the level of noise and vibration in fuel pump system.
구동축의 등속조인트 방식에 따른 진동특성의 실험적 연구
사종성(Jongsung Sa),안태길(Taekil Ahn),강태원(Taewon Kang) 한국생산제조학회 2019 한국생산제조학회지 Vol.28 No.1
The vibrational characteristics of automotive idling and driving were investigated experimentally using various types of constant velocity joint. Plunging force (PF) and generating axial force (GAF) are the most influential quantities related to vibration characteristics of constant velocity joint. The results of the MTS test set and vibration test show that PF has higher values and GAF aggravates the automotive idling and shudder vibration characteristics. Furthermore, the variation amplitude and the harmonic periods of the vibrational characteristics in the axial direction of the shaft affect the significantly idle vibration of the drive shaft. The measured apparent mass and acceleration data are useful in calculating the PF of the drive shaft, which has no dynamic absorber.
사종성(Jongsung Sa),강태원(Taewon Kang) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.4
This study aims to understand the applied forces and related vibrational characteristics of a tripod joint (TJ), which is mostly used in front-drive-type middle-sized sedans in South Korea. The plunging force (PF) and generated axial force (GAF) are the most influential quantities related to the vibrational characteristics of a driveshaft. To obtain meaningful data, specially designed tests were performed using MTS test sets. The results of direct measurements reveal that higher PF and GAF values appear to worsen the vibrational characteristics of the vehicle. On the other hand, the measured apparent mass is useful for calculating the applied forces for a short driveshaft that has no dynamic vibration absorber. Among diversely controlled samples, it shows that the viscosity and tight fit are very sensitive to shudder vibrations of the vehicle. Therefore, these are good design factors for quality controls in the production line of constant-velocity joints.
사종성(Jongsung Sa),신양현(Yanghyun Shin),강태원(Taewon Kang),김찬묵(Chanmook Kim) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.2
This paper deals with the characteristics of idle vibration due to the type of constant velocity joints. Based on the kinematics model of constant velocity joints, a offset between the tripod center and tullip center plays a important role in generating unwelcome forces. Moreover, it induced additional forces in lateral direction of a vehicle movement according to the angle of the spider in idle vibration. The difference of mass for each constant velocity joint types affect the natural frequency of the driveshaft and the powertrain. When the static torque is applied to the constant velocity joints, the natural frequencies of the driveshaft are reduced nearby 50㎐. There will be a big opportunity that the dirveshaft and constant velocity joints would be a transfer path of idle vibration at D or R gear range. Experiments indicate that TJ type is better than SFJ and DOJ in idle vibration.
스포츠 레저용 차량의 진동절연을 위한 고무제품의 특성에 관한 연구
사종성(Jongsung Sa),김찬묵(Chanmook Kim) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.5
Elastomers, which are used engine mounts and body mount rubbers, are traditionally designed for NVH use in vehicles, and for vibration isolation in specific frequency range. According to the measurement of the characteristics of the SUV's engine mounts, there are variability in same engine mount properties. Static and dynamic stiffness of the SUV's engine mounts are changed due to the driving miles accumulated. The pre-load of body mount rubbers are changed due to the empty vehicle weight, passenger's weight and gross vehicle weight. And the dynamic stiffness of body mount rubbers arc changed very hard above 150Hz frequency range.<br/>
자동차 루프의 진동제어를 위한 제진재의 위치 및 두께에 대한 실험적 연구
이정균(Jeongkyun Lee),김찬묵(Chanmook Kim),사종성(Jongsung Sa) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.6
This paper presents an experimental study on vibration characteristics of an automotive roof with damping material. The goal of the study is to extract modal parameters (natural frequency, loss factor, and mode shape) of automotive roof with damping materials treatment. To determine the effective positions and thickness of the damping material on a roof, vibration tests have been carried out for six cases; an aluminum plate with damping material on maximum strain energy positions, and an aluminum plate with damping material on nodal lines. From the result of aluminum plate, it is found that the damping material should be placed on the location with maximum strain energy part. For the automotive roof, patches of constrained damping material, which has two different density, have been attached to the positions of the maximum strain energy with four kinds of thicknesses. This paper shows that the proper positioning of the damping material is very important and the effective thickness is about twice that of the roof panel.
판넬 기여도 해석을 이용한 승용차 실내 소음 분석 기법에 관한 연구
진용선(Yongsun Jin),김찬묵(Chanmook Kim),고강호(Kangho Ko),허승진(Seungjin Heo),국형석(Hyungseok kook),사종성(Jongsung Sa) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper. the panel contribution analysis is used to identify the noise contribution of each sub-panel of car body to the total radiated noise. The accelerations of panels are measured in the normal direction on the outer surface of car body during operation. Acoustic transfer function, which has great influence on the panel contribution, is experimentally measured. In this procedure, volume acceleration of loudspeaker is defined by the application of equivalent area and a manifestation of the vibro-acoustical reciprocity. The panel contribution method is validated by comparing the radiated interior noise with the calculated radiated noises from each sub-panel. Contribution of panels for interior noise is ranked and problematic sub-panels of the car can be re-designed or reinforced according to the results.