• Title/Summary/Keyword: 스프링강성

Search Result 257, Processing Time 0.023 seconds

Modeling Negative Stiffness Mechanism of Vestibular Hair Cell by Applying Gating Spring Hypothesis to Inverted Pendulum Array (게이팅 스프링 가설을 적용한 전정기관 유모세포의 반강성 메커니즘 모델)

  • Lim, Ko-Eun;Park, Su-Kyung
    • Proceedings of the KSME Conference
    • /
    • 2007.05a
    • /
    • pp.405-408
    • /
    • 2007
  • Vestibular hair cells, the sensory receptors of vestibular organs, selectively amplify miniscule stimuli to attain high sensitivity. Such selective amplification results in compressive nonlinear sensitivity, which plays an important role in expanding dynamic range while ensuring robustness of the system. In this study, negative stiffness mechanism, a mechanism responsible for the selective amplification by vestibular hair cells, is applied to a simple mechanical system consisting of an array of inverted pendulums. The structure and working principle of the system have been inspired by gating spring hypothesis proposing that opening and closing of transduction channels contributes to the global stiffness of vestibular hair bundle. Parameter study was carried out to analyze the effect of each parameter on the compressive nonlinearity of suggested model.

  • PDF

Prediction of Dynamic Characteristics of Railway Vehicle by Stiffness Variation of Chevron Rubber Spring (세브론 스프링의 강성 변화에 따른 철도차량의 동특성 예측 연구)

  • You, Wonhee;Park, Joonhyuk;Park, Namcheol;Koo, Jeongseo
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.27 no.2
    • /
    • pp.162-167
    • /
    • 2017
  • The chevron rubber spring is used for subway vehicle as a primary suspension. Generally, the primary suspension has an influence to the running performance and not so much effect on the ride comfort in railway vehicle. But the stiffness of chevron spring is harder and harder as time goes on because of rubber characteristics. Therefore the dynamic characteristics such as ride comfort and derailment coefficient should be reviewed according to the stiffness variation of chevron rubber spring. In this paper the effect of chevron rubber spring on dynamic characteristics was studied by considering multi-body dynamics of railway vehicle on one straight line and seven curved lines.

Prediction and Evaluation of Stiffness of Chevron Spring for Rail Vehicle (철도차량용 세브론 스프링의 강성 예측 및 평가)

  • 김완두;김완수;우창수;정승일;김석원;김영구
    • Journal of the Korean Society for Railway
    • /
    • v.4 no.4
    • /
    • pp.123-130
    • /
    • 2001
  • A chevron rubber spring is used in primary suspension system for rail vehicle. The chevron spring support the load carried and reduces vibration and noise in operation of rail vehicle. The computer simulation using the nonlinear finite element analysis program MARC executed to predict and evaluate the load capacity and stiffness for the chevron spring. The appropriate shape and the material properties are proposed to adjust the required characteristics of chevron spring in the three modes of flexibility. Also, several samples of chevron spring are manufactured and experimented. It is shown that the predicted values agree well the results obtained from experiment.

  • PDF

An Experimental Investigation on the Characteristics of An Automotive Air Spring (자동차 공기스프링의 특성에 대한 실험적 고찰)

  • Lee, J.C.;Liu, H.
    • Transactions of The Korea Fluid Power Systems Society
    • /
    • v.8 no.2
    • /
    • pp.17-22
    • /
    • 2011
  • The analysis of an air spring characteristics is necessary to design and control automotive air suspension system properly. A mathematical model of an air spring was derived in light of energy conservation first. Then static and dynamic experiments of the air spring have been fulfilled. The static stiffness with various initial pressures and effective areas were obtained from the static experimental results. Theoretical static stiffness obtained by using the mathematical model and effective area data is in close accordance with the experimental estimation. The dynamic experimental results show that the hysteresis in displacement-force cycle decreases when the frequency of the harmonic displacement excitation signal increases, but it does not change too much as the frequency is higher than 1Hz. And the dynamic stiffness goes up with increasing of the initial pressure and the excitation frequency.

Equivalent mechanical model of smart actuators and optimal operating conditions (지능형 공진작동기의 기계적상사와 최적작동조건)

  • Kim, Jun-Sik
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • 2011.04a
    • /
    • pp.285-287
    • /
    • 2011
  • 본 논문에서는 지능형 작동기의 효율적 설계와 특성예측을 위하여 기계적 상사 모델을 개발하고, 작동기의 최적작동 조건을 고찰한다. 먼저 지능형 작동기의 기계적 상사는 단순한 2자유도 스프링-메스-뎀퍼 시스템으로 등가 시스템을 구현하였다. 이 때 스프링 강성계수는 시스템의 강성 또는 전기-기계 연성계수 등으로 상사되며, 전기회로 구성품 등은 질량, 뎀퍼 등으로 상사되어진다. 단순화된 기계적 상사모델을 이용하여 작동조건에서의 전기회로 구성품의 튜닝을 최적화 할 수 있다. 특히 작동기의 공진주파수에서의 특성을 고려하여 최적조건을 도출함으로써 그 성능을 극대화 할 수 있다.

  • PDF

A Study on the Stiffness Design for a Steel Spring Torsional Vibration Damper (강판 스프링형 비틀림 진동댐퍼의 강성설계 연구)

  • Lee, D.H.;Chung, T.Y.;Kim, Y.C.
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.23 no.11
    • /
    • pp.996-1002
    • /
    • 2013
  • Conditions of stiffness for a steel spring torsional vibration damper are difficult and ambiguous. Nevertheless correct estimation of stiffness is essential and important in the damper design for the damper to activate properly in the field. In this paper, to build up the estimation method of steel spring torsional vibration damper a miniaturized model was developed for modelling between a spring and inner star of the damper. The method obtained from the results through the experiment and analysis of it was applied to the prototype torsional damper.

Experiment characterization of the improvement of the rotational stiffness of the double-folded springs for MEMS structures (MEMS용 double-folded 스프링의 회전강성 개선 및 실험 평가)

  • Hwang I.H.;Kim C.I.;Wang S.M.;Lee J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2005.10a
    • /
    • pp.888-891
    • /
    • 2005
  • Compared to the simple-beam springs, double-folded springs have advantages of the linearity even at the long stroke, so that they have been widely used for optical components such as optical switches and optical attenuators. Until now only the stiffness of the double-folded springs dn the perpendicular direction of the shuttle movement has been considered for the stable operation, however, the rotational stiffness of the splings has not been researched as much. Therefore, this paper suggests the double-folded springs of the maximum rotational stiffness with the constant stiffness in the stroke direction using the reliability based topology optimization (RBTO), whose operation properties were experimentally characterized.

  • PDF

두께감소 판형 홀다운스프링 집합체의 탄성강성도 해석

  • 송기남;이진석;서정민;서금석;장흥순
    • Proceedings of the Korean Nuclear Society Conference
    • /
    • 1996.11b
    • /
    • pp.487-493
    • /
    • 1996
  • 판(leaf)의 너비가 일정하고 두께가 균일하게 감소하는 두께감소 홀다운스프링집합체(Tapered-Thickness Holddown spring Assembly ; TT-HDS)에서 단순 보 이론과 Castigliano의 정리를 이용하여 TT-HDS의 탄성강성도를 해석적으로 구할 수 있도록 종래에 유도되었던 탄성강성도 평가식을 수정하고 확장하였으며 TT-HDS의 기하학적 설계자료를 이용하여 탄성강성도를 평가하였다. 아울러 ANSYS code 의 접촉요소를 이용하여 TT-HDS을 유한요소 모델링하여 탄성강성도를 수치적으로 평가하였다. 평가 결과 전단력 및 축력이 TT-HDS의 탄성강성도에 미치는 영향은 약 0.09∼0.16%정도로서 TT-HDS의 탄성강성도는 주로 굽힘모우멘트에 의해 지배되고 있음이 확인되었다. 또한 접촉요소로 유한요소 모델링하여 평가한 결과는 확장된 평가식으로 평가한 탄성강성도와 매우 잘 일치하고 있음을 발견하였다.

  • PDF

Analysis and Design of Constant-Force Mechanisms Using a Linear Spring (선형 스프링을 이용한 상력 메커니즘의 분석 및 설계)

  • Kim, Whee-Kuk;Kim, Hae-Soo;Kim, Min-Gun;Yi, Byung-Ju
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.27 no.2
    • /
    • pp.215-222
    • /
    • 2003
  • In this paper, kinematic analysis and design of constant force mechanisms which employ a linear spring are studied. Firstly, sufficient conditions for the mechanisms to be the constant force mechanisms are derived in terms of displacement variables through the kinematic analysis. Secondly, a few conceptual mechanisms satisfying these constraints are proposed.