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Chinese Journal of Mechanical Engineering

, Volume 26, Issue 5, pp 861–872 | Cite as

Effects of joint on dynamics of space deployable structure

  • Hongwei Guo
  • Jing Zhang
  • Rongqiang Liu
  • Zongquan Deng
Article

Abstract

Joints are necessary components in large space deployable truss structures which have significant effects on dynamic behavior of these joint dominated structures. Previous researches usually analyzed effects of one or fewer joint characters on dynamics of jointed structures. Effects of joint stiffness, damping, location, number, clearance and contact stiffness on dynamics of jointed structures are systematically analyzed. Cantilever beam model containing linear joints is developed based on finite element method, influence of joint on natural frequencies and mode shapes of the jointed system are analyzed. Analytical results show that frequencies of jointed system decrease dramatically when peak mode shapes occur at joint locations, and there are cusp shapes present in mode shapes. System frequencies increase with joint damping increasing, there are different joint damping to achieve maximum system damping for different joint stiffness. Joint nonlinear force-displacement is described by describing function method, one-DOF model containing nonlinear joints is established to analyze joints freeplay and hysteresis nonlinearities. Analysis results show that nonlinear effects of freeplay and hysteresis make dynamic responses switch from one resonance frequency to another frequency when amplitude exceed demarcation values. Joint contact stiffness determine degree of system nonlinearity, while exciting force level, clearance and slipping force affect amplitude of dynamic response. Dynamic responses of joint dominated deployable truss structure under different sinusoidal exciting force levels are tested. The test results show obvious nonlinear behaviors contributed by joints, dynamic response shifts to lower frequency and higher amplitude as exciting force increasing. The test results are further compared with analytical results, and joint nonlinearity tested is coincident with hysteresis nonlinearity. Analysis method of joint effects on dynamic characteristics of jointed system is proposed, which can be used in optimal design of joint parameters to achieve optimum dynamic performance of jointed system.

Key words

deployable structure joint dynamic mode shape experiment 

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Copyright information

© Chinese Mechanical Engineering Society and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Hongwei Guo
    • 1
  • Jing Zhang
    • 1
  • Rongqiang Liu
    • 1
  • Zongquan Deng
    • 1
  1. 1.School of Mechanical and Electrical EngineeringHarbin Institute of TechnologyHarbinChina

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