• Title/Summary/Keyword: 감쇠력

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A Study on the Characteristics of Damping Force in a Hydraulic Actuator for Vehicle Active Suspension System (차량 능동 현가 장치용 유압 액추에이터의 감쇠력 특성에 관한 연구)

  • 윤영환;최명진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.2
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    • pp.150-158
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    • 2002
  • Through experimental works, the damping force vibration problem was investigated, which results from valve and surge pressure in the oil return line of the hydraulic circuit of an active suspension system in a passenger cu. Experiments were carried out under passive system, where an orifice valve was closed and non-active system, where an orifice valve was opened, using a pressure control valve controlled by solenoid. The effects of parameters of the valve overlap and accumulator on smoothing surge pressure was elucidated. It was proved that the apparent variation of damping force due to the overlap amount of pressure control valve is the most important factor to control the damping force variation. The procedure of the experimental works shows the development process of a proportional pressure control valve in the hydraulics system of an active suspension system of passenger car.

A study on the variable damping characteristics of the continuous controlled semi-active suspension system and the effect analysis of the vehicles motion performance (연속제어방식의 반능동형 전자제어 현가장치의 가변댐퍼 감쇠력 특성 연구 및 차량 운동성능에 미치는 효과 분석)

  • 소상균;조경일
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.8
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    • pp.190-198
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    • 1999
  • Continuously controlled semi-active suspension system may improve ride and handling properties. Here, as a mechanism to control the fluid flow solenoid valve mechanism is introduced and added to the basic passive damper to create damping forces of the shock absorbers. The system may produce continuously controlled damping forces in both solenoid valve only and combination with passive shock absorber including fluid flow is studied, and then the combined model is added to the full vehicle model to evaluate its ride and handling performance. Finally, the simulation results are compared to the vehicle models having similar suspension system.

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Transonic Aeroelastic Analysis of a Airfoil with Friction Damping (마찰 감쇠를 고려한 에어포일의 천음속 공탄석 해석)

  • Yoo, Jae-Han;Lee, In
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.11
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    • pp.1075-1080
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    • 2010
  • For the aeroelastic analysis of a wing with friction damping, coupled time integration method was used to obtain time responses in the subsonic and transonic regions. To take into account aerodynamic nonlinearity induced by shock wave on the lifting surface, transonic small disturbance equation with in-phase periodic boundary condition was used for unsteady aerodynamic calculation. For 2-DOF airfoil system with displace-dependent friction dampers, the effects of normal load slope and Mach number on flutter boundary were investigated.

Design of Lead-Shear Damper for Stay Cables (사장교 케이블 진동감소용 납-전단 댐퍼의 설계)

  • 안상섭
    • Journal of the Earthquake Engineering Society of Korea
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    • v.5 no.1
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    • pp.31-36
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    • 2001
  • 본 논문에서는 지점근처에 납-전단 댐퍼(LSD)가 설치된 케이블의 동적 거동에 대해 다루었다. 이러한 동적 거동에 대한 파악은 케이블의 진동 감소 목적으로 댐퍼를 설계하는 경우 중요한 절차중 하나이다. 납-전단 댐퍼와 같은 이력형 댐퍼의 실제 이력곡선에 기초하여 본 연구에서는 납-전단 댐퍼의 이력곡선을 완전 탄소성으로 가정하였다. 납-전단 댐퍼의 역학적 모델은 등가 켈빈 모델을 사용하였으며 케이블의 새그 효과를 고려하였다. 납- 전단 댐퍼의 용량이라고 할 수 있는 항복력을 설계변수로 선택하고 케이블에 최적의 감쇠효과를 부여하는 동적학적 관계에 대해 연구하였다. 또한 댐퍼가 케이블에 설치되는 지점과 케이블의 장력에 대한 댐퍼의 감쇠효과에 대해서도 연구하였다. 매개변수 해석결과 케이블의 기하학적 형상 및 댐퍼의 설치조건에 따라 납-전단 댐퍼가 케이블에 부가하는 감쇠의 크기가 변함을 알 수 있었으며, 이때 최대의 감쇠성능을 발휘하는 최적 항복력이 존재하는 것을 알았다.

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A Study on the Nonlinear Dynamic Modeling and Analysis of Damping Force Characteristics of Automotive Shock Absorber (차량용 충격흡수기의 비선형 동적거동 모델링 및 감쇠력 특성해석에 대한 연구)

  • 이춘태;곽동훈;정봉호;이지걸
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.1
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    • pp.104-111
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    • 2003
  • The performance of shock absorber is directly related to the car behaviour and performance, both for handling and comfort. In this study, a mathematical nonlinear dynamic model and computational method are introduced to study the flow and performance of shock absorber. The flow characteristics of components(piston and body valve) are investigated and applied to dynamic modeling of shock absorber to predict the damping force. The simulation results agree with the test data well. The shock absorber model proposed in this paper is applicable as a part of a full vehicle suspension simulation.

The effect of a pole length on damping force of MR engine mount (MR엔진마운트의 전극 길이가 감쇠력에 미치는 영향에 대한 실험적 연구)

  • Kang, Yung-Suk;Lee, Hyun-Chang;Lee, Hyung-Sik;Park, Woo-Cheul
    • Proceedings of the KAIS Fall Conference
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    • 2007.11a
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    • pp.323-325
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    • 2007
  • 본 연구에서는 MR유체를 적용한 엔진마운트 시스템을 제안하고, 자지장이 형성되는 전극의 길이변화가 엔진마운트의 감쇠력 변화에 미치는 영향에 대하여 실험적으로 고찰하였다. 가진주파수가 증가할수록 마운트로부터 전달되는 힘은 감소하지만, 공급하는 전류의 세기가 증가할수록 전달되는 힘은 증가하였다. 그러나 전극부의 길이변화는 전달되는 힘의 변화에 영향을 거의 미치지 않음을 확인하였다.

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Dynamic Stability Analysis of Nonconservative Systems for Variable Parameters using FE Method (유한요소기법을 이용한 비보존력이 작용하는 보-기둥 구조의 다양한 제변수 변화에 따른 동적 안정성 해석)

  • Lee Jun-Seok;Min Byoung-Cheol;Kim Moon-Young
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.17 no.4
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    • pp.351-363
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    • 2004
  • Equation of motion of non conservative system considering mass matrix, elastic stiffness matrix, load correction stiffness matrix by circulatory force's direction change and Winkler and Pasternak foundation stiffness matrix is derived. Also stability analysis due to the divergence and flutter loads is performed. And the influence of internal and external damping coefficient on flutter load is investigated applying the quadratic eigen problem solution. Additionally the influence of non-conservative force's direction parameter, internal and external damping and Winkler and Pasternak foundation on the critical load of Beck's and Leipholz's and Hauger's columns are investigated.

Configurations of the Friction Dampers Installed in a Reinforced Concrete Shear Wall-Moment Frame System (철근콘크리트 전단벽-모멘트골조 형식 건물에 대한 마찰형 감쇠기 설치방식 비교연구)

  • Park, Ji-Hun;Kim, Gil-Hwan
    • Journal of the Earthquake Engineering Society of Korea
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    • v.12 no.2
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    • pp.53-67
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    • 2008
  • In this study, seismic control performance of friction dampers installed in a reinforced concrete shear wall-moment frame system, of which main lateral force resisting system is a shear wall, is investigated. Three configurations of friction dampers are investigated. One is a diagonal brace type reinforcing the shear wall directly, another is a diagonal brace type reinforcing the moment frame without the shear wall, and the other one is a vertical boundary element type installed at both ends of the shear wall. In addition, various levels of the total friction force and its distribution methods are examined. Time history analysis considering material nonlinearity is conducted for seismic loads increased by the enhanced design code compared to the initial design loads, and energy dissipation, lateral loads and structural member damages are analyzed. As a result, the shear wall-reinforcing diagonal brace type with the total friction force of 30 % of the reference friction force gives the best performance on the whole, and the distribution methods of the friction force do not have remarkable difference in effects. Also, concentrated installation in adjacent four stories shows just a little compromised control performance compared to the entire story installation.

Case of Developing Analysis Model for Recoil System for Automatic Gun (자동포용 주퇴복좌장치의 해석모델 개발 사례)

  • Noh, Dae-Kyung;Kang, Young-Ky;Ji, Jae-Do;Park, Jin-Saeng;Jang, Joo-Sup
    • Journal of the Korea Society for Simulation
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    • v.24 no.4
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    • pp.35-41
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    • 2015
  • Recoil system for 40mm automatic gun is a device developed to absorb the shock of explosion. It is impossible to conduct pinpoint strike due to recoil if very high explosive shock, which is generated when an automatic gun fires shells, can't be absorbed. This study covers development and verification of analysis model for recoil system by utilizing a multi-domain software. The research process is as in the following. First, an analysis model is developed to verify damping characteristics through understanding of design intention. Second, environment which is identical to a field test is set up on analysis tool after putting explosive force that is measured through the test into the analysis model. Finally, the analysis model for recoil system using the multi-domain software is verified if it has effectiveness with a comparison between internal pressure of the recoil system along with displacement of gun barrel and the field test result.

충격식 감쇠기의 감쇠특성에 관한 연구

  • 김원철;전순기;양보석;문덕홍
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1992.04a
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    • pp.285-290
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    • 1992
  • 기계 구조물의 과도한 진동은 기계의 성능 및 수명에 나쁜 영향을 미치며 기계및 부품의 파괴까지 유발하게 되는 원인이되므로 이를 제진하기위한 각종 방법이 오래전부터 연구되고 있다. 본 연구에서는 현재까지 진행된 충격식 댐퍼의 이론을 기초로 한 사이클당 두번의 충돌이일어난다는 가정하에, 파라메타 의 변화에따른 최적 감쇠특성을 얻기위한 최적간극과 최적 질량비를 쉽게구할 수 있는 식을 유도하였다. 그리고, 실험에 의하여 공진상태에 있어서 불의 충격력에 의한 감쇠특성을 조사하였고, 이론으로구한 식과 비교 검토함으로서, 실제 현장등에서 간편하게 근사식을 이용하여 최적조건을 구하고, 이 자료를 기초로하여 설계, 제작시 보다 간편하게 사용할 수 있도록 하였다.