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진동 및 소음 저감을 위한 루프 제진재 설계 프로세스 연구
김기창(Kichang Kim),김찬묵(Chanmook Kim),김진택(Jintaek Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes the design process of roof damping material optimization to reduce vibration and noise. The vehicle studied in the present research was a 1,800 cc passenger car with a 4-cylinder engine. The interior noise generated in the wide-open throttle valve (WOT) of the vehicle during acceleration was mainly by 2nd-order components with respect to the engine RPM; as for frequency components, it was less than 200 ㎐. This paper presented that the roof panel is one of the sensitive components that the sound pressure level of the rear seat relative to the front seat is high. The optimized damping treatment configuration is validated by comparing the location and the size of the treatment with that of an experimental modal test conducted on roof compartment.
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.
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/>
AE(Acoustic Emission) 기법을 통한 재료 피로파괴 감지 장치 개발
최정황(Junghwang Choi),김대용(Daeyong Kim),손민영(Minyoung Son),김찬묵(Chanmook Kim),이성욱(Seangwock Lee),강호인(Hoin Kang),나완용(Wanyong Rha) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this work is to obtain fundamental data about material fatigue crack detection system using AE method. The acoustic emission as a nondestructive evaluation is one of the tests for realtime monitoring in the advanced countries such as US, Japan, Russia, etc. Characteristic evaluation of AE signal, AE frequency and RMS analysis for state monitoring is also presented in the paper. This test provided the fundamentals of AE method such as crack frequency when applying vibration on the welded pipe.
구조 음향 상반 원리를 이용한 승용차 차체 소음 민감도 측정 및 실내 소음 개선
전준식(Junsik Jeon),허승진(Seungjin Heo),김찬묵(Chanmook Kim),국형석(Hyungseok Kook),고강호(Kangho Ko) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents a experimental method for reduction of interior noise in compartment of passenger car. Though results in Wide-Open Throttle valve(WOT), the studied vehicle has a Interior noise problem at rear passenger seats. In order to identify the Noise transfer path of interior noise, Noise transfer function(NTF) of panels is fulfilled. The NTF obtained by experiment using Vibro-acoustic reciprocity. Using this methods, it has been founded that rear part of the roof and rear window shield glass of the test car were a noise source for the Interior noise. Based on these results, we verified that it is identical with Panel contribution analysis(PCA).