• 제목/요약/키워드: torsional spring

검색결과 95건 처리시간 0.03초

디젤엔진축계 진동저감을 위한 스프링-점성 댐퍼의 매개변수 결정 연구 (Study on the Parameter Decision of Spring-viscous Dampers for Torsional Vibration Reduction of Diesel Engine Shafting System)

  • 이동환;정태영;김영철;신윤호
    • 한국소음진동공학회논문집
    • /
    • 제20권12호
    • /
    • pp.1168-1175
    • /
    • 2010
  • Excessive torsional vibrations from marine engine shafting systems can be reduced by using torsional vibration dampers. But in order to be tuned effectively, the dampers should be designed through the optimum design procedure. In this paper, the procedure to get the optimum values of system parameters of spring-viscous dampers using effective modal mass of inertia and stiffness is suggested and the damping is determined by the exact algebra optimization method. The validity of the suggested method is confirmed through the application to a 1800 kW four cycle diesel engine and generator system.

Influence of torsional rigidity of flexible appendages on the dynamics of spacecrafts

  • Chiba, Masakatsu;Magata, Hidetake
    • Coupled systems mechanics
    • /
    • 제8권1호
    • /
    • pp.19-38
    • /
    • 2019
  • The influence of torsional rigidity of hinged flexible appendage on the linear dynamics of flexible spacecrafts with liquid on board was analyzed by considering the spacecraft's main body as a rigid tank, its flexible appendages as two elastically supported elastic beams, and the onboard liquid as an ideal liquid. The meniscus of the liquid free surface due to surface tension was considered. Using the Lagrangian of the spacecraft's main body (rigid tank), onboard liquid, and two beams (flexible appendages) in addition to assuming the system moved symmetrically, the coupled system frequency equations were obtained by applying the Rayleigh-Ritz method. The influence of the torsional rigidity of the flexible appendages on the spacecraft's coupled vibration characteristics was primary focus of investigation. It was found that coupled vibration modes especially that of appendage considerably changed with torsion spring parameter ${\kappa}_t$ of the flexible appendage. In addition, variation of the main body displacement with system parameters was investigated.

인공위성 태양전지판 전개 시스템 동적 모델링 (Dynamic Modeling of Satellite with Deployable Solar Arrays)

  • Seok Heo;Moon K. Kwak;Kim, Hong-B;Sang M. Moon;Sung H. Woo;Lee, Sang S.
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2002년도 추계학술대회논문초록집
    • /
    • pp.373.2-373
    • /
    • 2002
  • This research is concerned with dynamic modeling of satellite with deployable solar arrays equipped with strain energy hinges (SEH). It is found from experiments that the SEH has nonlinear dynamic characteristics and complex buckling behavior, which is difficult to explain theoretically In this paper, we use an equivalent one dimensional nonlinear torsional spring for the SEH. Lagrangian equations of motion are used for the derivations.

  • PDF

주행시 비틀림진동 저감을 위한 클러치 비틀림특성 연구 (A Study on Clutch Torsional Characteristics for the Torsional Vibration Reduction at Driving)

  • 정태진;홍동표;태신호;윤영진;김상수
    • 소음진동
    • /
    • 제5권1호
    • /
    • pp.75-83
    • /
    • 1995
  • The fluctuation of the engine torque appears to be the major source of the torsional vibration of the automotive driveline. The reduction of this torsional vibration has become a significant problem, due to an increase in the fluctuation of the torque of recent light weighted and high powered engines, along with the requirements of higher performance. The torsional vibration of the automotive driveline can be reduced by smoothing the fluctuation by adjusting the torsional characteristics of the clutch-disc. This paper presents an experimental and theoretical research on the clutch-disc torsional characteristics for the reduction of the torsional vibration at driving. The effects of clutch-damper on diminishing the torsional vibration were investigated experimentally. A dynamic model for the automotive driveline was developed, and the engine torque of the model were evaluated with experimental data. By executing a simulation using the model, it has become possible to obtain the clutch-disc torsional characteristics and the clutch-disc torsional characteristics for reducing the torsional vibration has been suggested. The results are as follows: (1) By exceuting simulations using nonlinear model of four degrees of freedom, a design technique to determine the clutch-disc torsional characteristics for reducing the torsional vibration at driving was developed. (2) The influence of barious torsional characteristics of the clutch has been studied in examining design parameters, which indicates that the domain to minimize the torsional vibration at driving depends on the characteristics of the clutch-damper, i. e., spring constant and hysteresis.

  • PDF

차량주행시 동력전달계의 강제진동 해석 (Computer Simulation of Powertrain Forced Torsional Vibration)

  • 최은오;안병민;홍동표
    • 소음진동
    • /
    • 제7권5호
    • /
    • pp.853-860
    • /
    • 1997
  • For this study, the multi-degree of freedom analysis model of torsional vibration was developed. This model is combined with mass moment of inertia and torsional spring in two wheel drive and four wheel drive vehicle. We compared and analyzed torsional vibration characteristics by natural frequencies and mode shapes which are obtained by free vibration analysis of this model. And we studied torsional vibration contribution of driveline elements by performing the forced vibration analysis of engine excitation torque. The validity of this model is demonstrated by the field test. The reduction effect of the torsional vibration along the driveline design factor is presented by the analytical results.

  • PDF

매개변수 변동을 갖는 2관성 시스템의 강건제어 (Robust Control of Two Mass Spring System with Parameter Variations)

  • 조도현;이종용;이상효
    • 제어로봇시스템학회논문지
    • /
    • 제4권6호
    • /
    • pp.729-737
    • /
    • 1998
  • In this paper, using $\mu$ synthesis algorithm with structured uncertainty, we design controller and apply it for the Two-Inertia resonance(TMS: Two Mass Spring) system. The TMS system is one of the simplest models which generate a torsional vibration. In this system, it is required to design a controller achieving the control performance while suppressing the torsional vibration. Furthermore, when vibration frequency for the system is varying by reason of parameter variations, we should consider parameter variations in controller design. Then, we design two other controller schemes of the PI controller and the standard $H_{\infty}$ controller and compare these controllers with the controller designed by the $\mu$ synthesis robust control method by using simulations and experiments.

  • PDF

2관성 공진 시스템의 강건제어 (The Robust Control of Two Mass Spring System)

  • 조도현;이종용;이상철
    • 전자공학회논문지T
    • /
    • 제35T권3호
    • /
    • pp.76-86
    • /
    • 1998
  • 2관성 공진(TMS: Two-Mass Spring) 시스템은 비틀림 진동을 다루기 위하여 고려할 수 있는 가장 간단한 모델이다. 이러한 시스템은 비틀림 진동을 억제하며, 원하는 특성을 달성하기 위한 제어기 설계가 요구된다. 본 논문에서는 2관성 공진 시스템에 대하여 상태 피드백을 고려하고, 각 상태가 응답성능에 미치는 영향을 살펴본다. 이 결과와 상태 피드백의 이득을 이용하여 제어기의 설계 매개변수와 LQ 및 H/sub ∞/ 제어의 하중함수 결정에 대한 기본 지침을 제시한다.

  • PDF

점성-스프링 댐퍼 최적화 설계를 이용한 엔진 증속지연 특성을 갖는 추진축계 비틀림진동 제어 (Control of torsional vibration for propulsion shafting with delayed engine acceleration by optimum design of a viscous-spring damper)

  • 김양곤;황상재;김영환;김상원;조권회;김의간
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제40권7호
    • /
    • pp.580-586
    • /
    • 2016
  • 추진효율 향상을 위해 개발된 초장행정 엔진은 저속에서도 큰 출력을 낼 수 있는 장점이 있는 반면에 이전에 비해 비틀림진동의 기진력은 상당히 증가하였다. 따라서 이전에는 튜닝 휠 또는 플라이휠만으로도 제어가 가능하였던 선박들도 연료절약형 초장행정 엔진이 탑재되는 경우에는 비틀림진동 댐퍼를 적용해야만 제어가 가능하다. 본 논문에서는 비틀림진동 제어를 위해 적용된 점성-스프링 댐퍼의 동특성을 확인하고 해당 축계에 최적 동특성을 갖는 점성-스프링 댐퍼를 설계하여 비틀림진동 특성을 검토하였다. 또한, 일부 엔진증속 지연현상을 지닐 우려가 있는 선박의 경우에는 대상축계의 진동 특성을 고려하여 최적댐퍼 설계이론에 따라 선정된 파라미터를 적절히 조정함으로써 과도한 피로누적에 따른 축 절손현상을 방지할 수 있는 축계 비틀림진동 제어 방안을 제시하였다.

4륜구동 차량구동계의 비틀림진동 특성에 관한 연구 (A study on the characteristics of torsional vibration for 4*4 vehicles drivetrain)

  • 최은오;김희송;홍동표
    • 대한기계학회논문집A
    • /
    • 제21권11호
    • /
    • pp.1957-1964
    • /
    • 1997
  • Torsional vibration is to vibrate strongly when the ignition pulses of the engine is excited with natural frequency of driveline. Torsional vibration like this can cause various noises as rattle and booming. For this study multi-degree of freedom analysis model of torsional vibration, which is combined with mass moment of inertia and torsional spring, was developed toward two wheel drive, four wheel drive and torsional vibration characteristics were compared and analyzed through the natural frequences, mode shapes and frequency response characteristics which was acquired by the simulation of it. The pertinence of that model was proved by the field test and the outcome of the simulations coincided with feeling test. Therefore, four wheel drive simulation model is considered to be useful thing for reducing torsional vibration of driveline and developing full-time four wheel drive vehicles.

클러치 댐퍼용 원심 진자 흡진기의 비틀림 진동 절연 성능 평가 (Torsional Vibration Isolation Performance Evaluation of Centrifugal Pendulum Absorbers for Clutch Dampers)

  • 송성영;신순철;김기우
    • 한국소음진동공학회논문집
    • /
    • 제26권4호
    • /
    • pp.436-442
    • /
    • 2016
  • This paper presents the torsional vibration isolation performance evaluation of a centrifugal pendulum absorbers (CPAs) that has a continuously varying resonance frequencies proportional to engine firing (excitation) order. CPAs are commonly used to suppress torsional vibrations in rotating machinery and internal combustion engines. In this study, they are employed on the current spring type torsional damper inside a torque converter of automotive vehicle. To evaluate the effectiveness of designed resonance tuning order, the torsional vibration transmissibility based on torque measurements with respect to different engine firing orders is experimentally measured with a lower-inertia dynamometer. The torsional vibration transmissibility with respect to different frequencies with engine order of 2 is also evaluated. It has been demonstrated that the significant vibration reduction over operational frequency range of interest can be achieved by attaching simple pendulums. Future research direction includes the study on theoretical analysis, improved design of pendulum etc.