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하이포이드 기어의 소음원인규명을 위한 디플렉션 테스트와 전달에러 측정에 대한 연구
최병재(Byungjae Choi),오재응(Jae-Eung Oh),박상길(Sang Kil Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Hypoid gears are widely used in rear drive and 4WD vehicle axles. Investigation of their sensitivity to deflections is one of the most important aspects of their design and optimization procedures. The deflection test is performed in the actual gear mounting using completely processed gear. This test should cover the full operating range of gear loads from no load to peak load. Under peak load the contact pattern should extend to the tooth boundaries without showing a concentration of the contact pattern at any point on the tooth surface. Transmission error is tested on an axle assembly triaxial real car load condition.
최병재(Byungjae Choi),한인규(In-kyu Han),조정욱(Jeong-wook Cho) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Abnormal cab vibrations in the Y direction in commercial vehicles during driving(70~90kph) are not common vibrations that happen to vehicles during driving and can be an obstacle to normal driving. This study conducted Operation Deflection Shape(ODS) testing to identify the causes of those abnormal cab vibrations and find solutions for them and also a sine sweep test to find resonance and frequency in the cab suspension system and set directions for improvement. The study also altered the shape of the bush inner part for changes to the rigidity features of the cab bush in the Y direction and revised the design with optimal rigidity in the Y direction, thus improving abnormal cab vibrations in the Y direction during driving.
최병재(Byungjae Choi),한인규(In-kyu Han),조정욱(Jeong-wook Cho) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
This paper presents an investigation into the reduction of steering wheel vibration in large commercial vehicles. Since commercial vehicles have a complex steering system unlike passenger cars, there are limitations in approaching them with the old simple experimental methods or analytical modeling methods to simplify the system. In the present study, the investigators thus employed the Muller-BBM O.T.P.A. (Operational Transfer Path Analysis). The problems with the steering wheel vibration stem from excessive vibration in the loading- and driving-based engine blast and idle state. Those vibrations make the palms of the driver feel a tickle or stinging sensation. The investigators experimentally acquired the transfer function of complex steering wheel vibrations as a source or path according to the vibration size at each location of measurement with a source in case of large vibration size and a path in case of small vibration size. The transfer functions were then compared, and the contribution of each vehicle system was analyzed in the problematic sections. The physical properties of a system whose contribution was the biggest were changed to test the O.T.P.A. results and reduce the vibrations in the problematic sections of steering vibration.
최병재(Byungjae Choi),오재응(Jae-Eung Oh),박상길(Sanf Kil Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Hypoid gears are widely used in rear drive and 4WD vehicle axles. The investigation of their sensitivity to deflections is one of the most important aspects of their design and optimization procedures. A deflection test thus performed in this study, in the actual gear mounting, using completely processed gear. This test covered the full operating range of gear loads, from "no load" to "peak load." Under peak load the contact pattern extended to the tooth boundaries without showing a concentration of the contact pattern at any point on the tooth surface. The transmission error was tested on an axle assembly triaxial-real-car-load condition.