• Title/Summary/Keyword: Idle Vibration

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A Study on the Quality Deviation of Passenger Cars using the Robust Design (강건 설계 기법을 이용한 승용차의 품질 산포에 관한 연구)

  • Kim, Ki-Chang;Kim, Chan-Mook
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.05a
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    • pp.110-113
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    • 2006
  • This paper describes the development process of body and full vehicle for reduced idle vibration through the data level of frequency and sensitivity. The vibration mode map is used to separate body structure modes from resonance of engine idle nm and steering system. This paper describes the analysis approach process to reduce the variation of uncertainties for idle vibration performance at initial design stage. The robust design method is performed to increase the stabilization performance under vehicle vibration. It is used to predict the effects of the stiffness deviation according to the spot welding condition of the body structure. The tolerance associated with hood over slam bumper is analyzed for the quality deviation of the moving system in full vehicle. And the glass sealant stiffness and weight difference is considered for the deviation characteristic. The design guideline is suggested considering sensitivity about body and full vehicle by using mother car at initial design stage. It makes possible to design the good NVH performance and save vehicles to be used in tests. These improvements can lead to shortening the time needed to develop better vehicles.

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A Study on the System Parameters to Reduce the Idle Gear Rattle (기어 래틀 저감을 위한 시스템 파라미터 연구)

  • 안병민;장일도;최은오;홍동표;정태진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.3
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    • pp.88-96
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    • 1998
  • The rattle noise is the most significant in many kinds of manual gearbox nioses, which is generated at the idle stage of the engine operation. The main torsional vibrat- ion source of the driveline is the fluctuation of the engine torque. The gear rattle is impacts generating in the backlash of the free gear due to this torsional vibration. Many researchers reported the clutch torsional characteristic optimization method to reduce the idle gear rattle but only few of them give sufficient consideration to the system parameters like gear backlash, drag torque, system inertia, inertia distribution, engine torque fluctuation, idle engine rotation speed, and accessory load. In this paper, influence rate of system parameters on the gear rattle is presented and counterplans like backlash reduction, drag torque increase, inertia addition, inertia distribution modification and engine torque characteristic control are suggested.

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Vibration Analysis of an Exhaust System with Bellows Using the Component Mode Synthesis (부분구조 합성법을 이용한 배기계의 진동해석)

  • Lim, Jae-Moon;Kim, Min-Soo;Lee, Kwi-Young
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.7 s.94
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    • pp.1833-1840
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    • 1993
  • An efficient vibration analysis method, Component Mode Synthesis(CMS), for an exhaust system with bellows is presented. Analyses are performed for two types of bellows, where characteristics of vibration modes affecting idle shake and interior noise of a vehicle are examined. Also analyzed are the contributions of an exhaust and engine mounting system to the idle shake and interios noise. Comparison between the analysis and test is in good agreement, hence the CMS method is shown to be efficient and valid.

Evaluation of Ride Comfort of the Passenger Vehicle Seat on Idle Vibration by Virtual Seat Method (Virtual Seat Method를 이용한 승용차량 시트의 정차시 진동에 대한 승차감 평가)

  • Lee, Jae-Young;Ahn, Se-Jin;Jeong, Wei-Bong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.7
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    • pp.631-639
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    • 2013
  • Virtual seat method(VSM) which is an evaluation method combined objective and subjective process is used in this study in order to determine seat comfort index of idle vibration of passenger vehicle. The VSM is implemented by two steps which are for objective index in the first step and for subjective estimation in the second step. In the study, two seats mounted on passenger vehicle was compared in terms of dynamic seat comfort by six subjects employed for the VSM method as well as SEAT value which is a conventional objective method. It is concluded that the dynamic comfort index by the VSM is more reliable than the SEAT value thanks to adding subjective evaluation on top of the objective result.

An Experimental Study of Engine Mount Optimization to Improve Noise and Vibration Quality of F.R. Vehicle (후륜구동 차량의 소음 진동 성능향상을 위한 엔진마운트 최적설계에 관한 실험적 연구)

  • 이준용;김찬묵
    • Journal of KSNVE
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    • v.7 no.4
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    • pp.681-688
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    • 1997
  • The purpose of engine mount system is to reduce the noise and vibration caused by engine vibration, and to decouple the roll and bounce mode at idle. To reduce the noise and vibration level in a vehicle, it is important to make the design optimization of engine mount system that consider the moment of inertia and inclination of mount rubber. As a result, according to the definition of Torque Roll Axis (TRA), the vibration axis at idle must be on the TRA or very close to it. In this paper, we studied the effect of the design optimization of engine mount system. And we have achieved good improvements in noise and vibration quality of F.R. vehicle.

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Experimental Study of Engine Mount Optimization to Improve NVH Quality (NVH 성능향상을 위한 엔진마운트 최적설계에 관한 실험적 연구)

  • 이준용
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1996.10a
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    • pp.330-337
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    • 1996
  • The purpose of engine mount system is to reduce the noise and vibration caused by engine vibration, and to decouple the roll and bounce mode at idle. To reduce the noise and vibration level in a vehicle, it is important to make the design optimization of engine mount system that considered the moment of inertia and inclination of mount rubber. As a result, according to the definition of Torque Rool Axis (TRA), the vibration axis at idle must be on the TRA or very close to it. In this paper, we studied the effect of the design optimization of engine mount system. And we have a good NVH performance.

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On the Modeling and Simulation of Friction for an Automotive Clutch (자동차 클러치의 마찰 모델과 시뮬레이션)

  • 이병수;이재천
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.2
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    • pp.116-125
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    • 2003
  • Four models for stick-slip friction are presented and are adopted for a numerical simulation study for a manual transmission clutch damper in idle mode. Meaning of parameters for friction models are explained and proper values are suggested. Also explained ate the reason why those specific values for the parameters are chosen. Preferable model for the clutch damper In Idle mode is discussed in terms of calculation efficiency and fidelity of the model based on real measured data. For clutch damper idle mode simulation studies, all four models perform equally well.

A Study on the Clutch Damper Design Technique (클러치 댐퍼 설계 기법 연구)

  • 안병민;장일도;최은오;홍동표;정태진
    • Journal of KSNVE
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    • v.7 no.6
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    • pp.1031-1037
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    • 1997
  • The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is generated by an impact in the backlash due to this torsional vibration. Optimization of the clutch torsional characteristic is one of the effective methods to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the detail clutch modeling and clutch design parameters (stiffness, hysteresis torque, preload, first stage length). This paper pays attention to the gear impact mechanism and clutch design parameters to reduce the idle gear rattle with computer simulation.

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A Study on the Design Technique to Reduce the Rattle Vibration (래틀 진동을 위한 설계 기법 연구)

  • 안병민;장일도;홍동표;정태진
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.562-566
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    • 1997
  • The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is impacts generating in the backlash of the free gear due to this torsional vibration Optimization of the clutch torsional characteristic is one of the effective methods to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the full clutch design parameters(stiffness, hysteresis torque, preload, first stage length) and drag torque This paper pays attention to the gear impact mechanism, clutch design parameters and drag torque to reduce the idle gear rattle with computer simulation.

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Investigations on Improvement of Vehicle Design Feature on Idle Shake with Automatic Transmission (자동변속기 장착 차량의 아이들 셰이크 진동 성능 개선 대책에 대한 고찰)

  • Choi, Cheon;Suh, Myung-Won;Kim, Young-Gin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.4
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    • pp.110-120
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    • 2000
  • In order to improve the vibration characteristics of mid sized passenger car automatic transmission at idle experimental and theoretical studies have been carried out. Idle shake in "D" range occurs by various reasons such as characteristics of body bending resonance between subsystems and engine mounts etc. Using full vehicle finite element analyses and modal tests we introduce the way to reduce the idle shake in the early design stage. It shows that the exciting forces are the 2nd order torque and force of engine. A powertrain system modes in "D" range are entirely effected by the additional boundary conditions of drive line. As a result the frequencies of subsystems are arranged to be lined up at the idle frequency range in order to avoid the resonances with subsystems To reduce the idle shake mounts of radiator are tuned to act as a dynamic damper to 1st bending frequency of the body. In addition a hydraulic mount which is optimized by Phase Shift Method is applied to the rear engine mount.e rear engine mount.

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