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Dynamic Analysis of Gimbal Structure System Including Nonlinear Elastic Rubber Vibration Isolator with Shock Acceleration

비선형 탄성 방진 고무부에 충격 가속도를 받는 짐발 구조 시스템의 동적 해석

  • Lee, Sang Eun (Seeker & E/O IR R&D Lab., LIG Nex1 Co., Ltd.) ;
  • Lee, Tae Won (Dept. of Mechanical Design Engineering, Kumoh Nat'l Institute of Technology)
  • 이상은 (LIG 넥스원 연구개발본부 탐색기&광학연구센터) ;
  • 이태원 (금오공과대학교 기계설계공학과)
  • Received : 2015.10.28
  • Accepted : 2016.01.26
  • Published : 2016.04.01

Abstract

When shock acceleration is applied to a mechanical system, it may cause malfunctioning and damage to the system. Hence, to prevent these problems when developing a gimbal structure system for observation reconnaissance, the MIL-STD-810G shock standard must be satisfied as a design specification. Rubber vibration isolators are generally assembled on the base of the system in order to reduce the shock transferred from the aircraft. It is difficult to analyze the transient behavior of the system accurately, because rubber has a nonlinear load-deformation curve. To treat the nonlinear characteristic of the rubber, bilinear approximation was introduced. Using this assumption, transient responses of the system under base shock acceleration were calculated by the finite element method. In addition, experiments with a true prototype were performed using the same conditions as the analytical model. Compared with experimental data, the proposed numerical method is useful for the transient analysis of gimbal structure systems, including rubber vibration isolators with nonlinear stiffness and damping.

Keywords

Rubber Vibration Isolator;Nonlinearity;Shock Acceleration;Bilinear Approximation;Transient Response Analysis

Acknowledgement

Supported by : 금오공과대학교

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