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Research on Dynamics Modeling and Simulation of Constrained Metamorphic Mechanisms

  • Yanyan Song
  • Boyan Chang
  • Guoguang JinEmail author
  • Zhan Wei
  • Bo Li
  • Yongjie Zhu
Research Paper
  • 25 Downloads

Abstract

This paper presents a method for establishing a unified dynamics model of constrained metamorphic mechanisms. Based on the equivalent resistance, the influences of geometric constraints and/or force constraints on metamorphism are discussed, and the kinematic characteristics of metamorphic joints are described and analyzed in detail. On this basis, the metamorphic configurations of augmented Assur groups can be classified into three types, including non-collision, internal collision and external collision configurations, and the configuration complete dynamics models of augmented Assur groups are established. Then, the dynamics models of active parts, Assur groups and augmented Assur groups are summarized into a unified mathematical framework, and the unified dynamics model of constrained metamorphic mechanisms can be obtained. Based on the research mentioned above, the initial conditions of all components and the motion law of the active parts are given. The motion laws of all components, the driving force/torque of the active parts and the constraint force/torque of the metamorphic joints can be obtained by iteration and solution based on the theory that velocity and acceleration are same in an extremely brief period. Taking the planar double-folded metamorphic mechanism and the metamorphic nipper swing mechanism as examples, the computer numerical analysis and dynamic simulation are carried out to verify the correctness and effectiveness of the proposed theory and method.

Keywords

Constrained metamorphic mechanisms Augmented Assur groups Dynamics Iterative algorithm 

Notes

Acknowledgements

This research was sponsored by the National Natural Science Foundation of China (Nos. 51275352, 51475330), Natural Science Foundation of Tianjin (Nos. 17JCQNJC03900, 18JCQNJC05300) and the Program for Innovative Research Team in University of Tianjin (No. TD13-5037).

Compliance with Ethical Standards

Conflict of interest

The authors have declared that no competing interests exist.

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Copyright information

© Shiraz University 2019

Authors and Affiliations

  • Yanyan Song
    • 1
    • 2
  • Boyan Chang
    • 1
    • 2
  • Guoguang Jin
    • 1
    • 2
    Email author
  • Zhan Wei
    • 1
    • 2
  • Bo Li
    • 1
    • 2
  • Yongjie Zhu
    • 1
    • 2
  1. 1.School of Mechanical EngineeringTiangong UniversityTianjinChina
  2. 2.Tianjin Key Laboratory of Modern Electromechanical Equipment TechnologyTianjinChina

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