• Title/Summary/Keyword: Torsional Vibration Damper

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A Study on the Torsional Vibration Damper of the Small Internal Combustion Engine Driving System(Part I) - Development of the Optimum Viscous-Rubber Damper- (소형내연기관축계의 비틀림진동댐퍼에 관한 연구 제1보 최적점성.고무탄성댐퍼의 개발)

  • 전효중;김유종;김의간;김동혁
    • Journal of Advanced Marine Engineering and Technology
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    • v.15 no.2
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    • pp.44-52
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    • 1991
  • The crankshaft system of engine is a complex vibratory object and its vibration modes are consisted of torsional, axial and their coupled vibration. Among them, the torsional vibration causes engine noise as well as serious fatigue faillures of crankshaft. If the troules of noises and crankshaft strength are forecasted by torsional vibration calculation in the design atage of crankshaft, the torsional damper is adopted as the final countermeasure. In this paper, some computer program to calculate crankshaft torsional vibration of engine are developed and with developed programs, an efficient rubber-viscous damper for automobile and with developed programs, an efficient rubber-viscous damper for automobile engine is designed and manufactured, and then it is fitted on the actual automobile engine to confirm its calculated efficiency. By comparing the measured result (with damper and without damper) with the calculated one, the reliability of developed computer programs and the performances of manufactured damper are confirmed.

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Optimum Design of Viscous Fluid Damper for Reducing the Torsional Vibration of Propulsion Shaft System (추진축계 비틀림 진동 감쇠를 위한 점성 댐퍼의 최적 설계)

  • Park, Sang-Yun;Han, Kuk Hyun;Park, Ju-Min;Kwon, Sung Hun;Song, Ohseop
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.9
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    • pp.606-613
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    • 2015
  • In this study, the torsional vibration analysis for a marine propulsion system is carried out by using the transfer matrix method(TMM). The torsional moment produced by gas pressure and reciprocating inertia force may yield severe torsional vibration problem in the shaft system which results in a damage of engine system. There are several ways to control the torsional vibration problem at hand, firstly natural frequencies can be changed by adjusting shaft dimensions and/or inertia quantities, secondly firing order and crank arrangement are modified to reduce excitation force, and finally lower the vibration energy by adopting torsional vibration damper. In this paper, the viscous torsional vibration damper is used for reducing the torsional vibration stresses of shaft system and it is conformed that optimum model of the viscous damper can be determined by selecting the geometric design parameters of damper and silicon oil viscosity.

Evaluation of Torsional Vibration Isolation Damper in Automotive Transmissions Based on In-situ Torque Measurement (토크 측정을 이용한 차량 변속기용 비틀림 진동 절연 댐퍼 평가)

  • Kim, Gi-Woo;Jang, Jae-Duk
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.4
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    • pp.377-382
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    • 2012
  • This paper presents a proof-of-concept study on the evaluation of torsional vibration isolation performance through in-situ output torque measurement by using a non-contacting magneto-elastic torque transducer installed in the vehicle driveline system. The de-trending processing is first conducted to extract the torsional vibration from the measured driveline output torque. In order to estimate the transmissibility, primary performance indicator of a vibration isolator, the magnitude of transmitted torsional vibration with different frequencies is compared. From the conservative estimation results, the torsional damper built in a lock-up clutch of a torque converter is identified to be a vibration isolator. The evaluation results show that the fluid damping by torque converter outperforms the vibration isolation function of a torsional damper, and the isolation performance needs to be enhanced.

Experimental Study for Torsional Vibration Monitoring System Development of Diesel Engine (디젤엔진의 비틀림진동 모니터링 시스템 개발을 위한 실험적인 연구)

  • 이돈출;김상환;장석기
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11b
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    • pp.640-646
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    • 2001
  • The torsional vibration monitoring system(TVM) for large diesel engines was developed and applied by manufacturers of torsional vibration damper, flexible coupling and diesel engine since 1990s. And demands of TVM have been steadily increased to operate safely engine and to extend maintenance interval of damper and flexible coupling. In this paper, the experimental methods and algorithms of TVM development which used the existing PC, turning wheel and speed sensors in ship are introduced.

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A study on the design of the torsional vibration viscous damper for the crankshaft and developing of its performance simulation computer program (크랭크축 비틀림진동점성댐퍼의 설계와 댐퍼 성능시뮬레이션프로그램개발)

  • 이충기;전효중
    • Journal of Advanced Marine Engineering and Technology
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    • v.13 no.1
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    • pp.77-96
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    • 1989
  • In diesel engines, it is inevitable that the torsional vibration is produced by the fluctuation of engine torque. Therefore, if the occurence of torsional vibration is confirmed in the design stage or the torsional vibration is observed on the bed of test run, it is necessary to establish some preventive measures to avoid dangerous conditions. Major preventive measures are as follows : 1. Changing the natural frequency of shaft system. 2. Repressing the vibration amplitude by the damping energy. 3. Counterbalancing the exciting torque by the resistant torque. 4. Counterbalacing the harmonic component of exciting energy. In above methos, the damper is the last measure to be used for controlling the torsional vibration. In this thesis, the design of viscous damper that absorbs the exciting energy is investigated and a number of problems associated with the design of viscous damper are treated and a computer pregram for the process of damper design is developed. A viscous damper for a high speed diesel engine is designed and its effect is simulated by the author's computer program.

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Process Analysis and Test for Manufacturing the Sleeve Spring Type-Torsional Vibration Damper (슬리브 스프링 형식 비틀림 진동감쇠기 제조를 위한 공정해석 및 시험)

  • Hwang, Beom-Cheol;Bae, Won-Byong;Jang, Young-Jun;Kim, Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.12
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    • pp.1471-1481
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    • 2009
  • In diesel engines, it is inevitable that the torsional vibration is produced by the fluctuation of engine torque. Therefore, it is necessary to establish preventive measures to diminish the torsional vibration. The sleeve spring type damper is one of the preventive measures for reducing the torsional vibration. In this study, the closed form equations to predict the spring constant of a sleeve spring and the torsional characteristics of the torsional vibration damper are proposed to calculate stiffness of the damper and verified their availability through the finite element analysis and experiments. And the stability of the sleeve spring torsional vibration damper is verified by analyzing the inner star and outer star, which are the core parts of the damper, and 2-roll bending process is proposed to manufacture sleeve spring. The program to calculate the initial radius including spring-back effect is developed, and the FEA method to analyze elasto-plastic problem was verified through analysis of 90$^{\circ}$bending process. The results of the analysis are in good agreements with those of the experiments. The newly proposed method can be used as an advanced technique that remarkably curtails cost of production and replaces the conventional forming.

Optimum Design of Viscous Torsional Vibration Damper Using Random Tabu Search Method (Random Tabu 탐색법을 이용한 점성 비틀림 진동감쇠기의 최적설계)

  • 김유신;양보석
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1996.10a
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    • pp.301-306
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    • 1996
  • A torsional damper is generally used to reduce the torsional vibration which occurs at a crankshaft of a multi-cylinder high speed diesel engine. Vibration amplitude should be estimate by the appropriate simulation model to determine the optimum specifications of damper. In this paper a new method which was based on the random tabu search method(RTSM) would be introduced for the viscous damper design to optimize the damping performance. The result was ascertained by comparing with conventional rubber damper.

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Evaluation of Torsional Vibration Isolation Performance Using In-situ Driveline Output Torque Measurement (구동 출력 토크 측정을 이용한 비틀림 진동 절연 성능 평가)

  • Kim, Gi-Woo;Jang, Jae-Duk
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.382-387
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    • 2012
  • This paper presents a proof-of-concept study on the evaluation of torsional vibration isolation performance through in-situ output torque measurement by using a non-contacting magneto-elastic torque transducer installed in the vehicle driveline system. The de-trending processing is first conducted to extract the torsional vibration from the measured driveline output torque. In order to estimate the transmissibility, primary performance indicator of a vibration isolator, the magnitude of transmitted torsional vibration with different frequencies is compared. From the conservative estimation results, the torsional damper built in a lock-up clutch of a torque converter is identified to be a vibration isolator. The evaluation results show that the fluid damping by torque converter outperforms the vibration isolation function of a torsional damper, and the isolation performance needs to be enhanced.

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A Study of Structural Analysis and Torsional Characteristic of the Sleeve Spring Type-Torsional Vibration Damper (슬리브 스프링형식 비틀림 진동감쇠기의 구조 해석 및 비틀림 특성에 관한 연구)

  • Hwang, Beom-Cheol;Kim, Chul;Bae, Won-Byoung
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.2
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    • pp.94-100
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    • 2009
  • In diesel engines, it is inevitable that the torsional vibration is produced by the fluctuation of engine torque. Therefore, it is necessary to establish preventive measures to diminish the torsional vibration. The sleeve spring type damper is one of the preventive measures for reducing the torsional vibration. In this study, a closed form equation to predict spring constant of the sleeve spring and torsional characteristic of the torsional vibration damper was proposed to calculate stiffness of the damper and verified their availability through the finite element analysis. The theoretical values have a good agreement with the results obtained by the finite element analysis. The results obtained from the equation derived enable the designers in actual fields to be more efficient.

Influence on the Torsional Vibration of Input Shaft and the Vibration of Vehicle by Damper Clutch in Auto-Transmission (자동변속기의 댐퍼 클러치가 Input Shaft 의 비틀림 진동 및 차체 진동에 미치는 영향 연구)

  • Jung, Byung-Hwan;Hwang, Seon-Yang;Kang, Koo-Tae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.344-350
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    • 2009
  • According to torsional vibration characteristic of a damper clutch in auto-transmission, the input shaft system have occurred breakdown for the duration cycle and over-vibration happened on vehicle at specific condition. This paper describes the improvement of the torsional vibration of input shaft and the vehicle vibration by tuning of the damper clutch and suggests to the guide line about torsion characteristic on the design of damper clutch.

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