• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2023, Vol. 59 ›› Issue (11): 189-200.doi: 10.3901/JME.2023.11.189

Previous Articles     Next Articles

Nonlinear Dynamic Reliability Analysis for a Controllable Metamorphic Palletizing Robot

WANG Rugui1, CHEN Huiqing1,2, DONG Yichen1   

  1. 1. College of Mechanical Engineering, Guangxi University, Nanning 530004;
    2. College of Mechanical and Control Engineering, Guilin University of Technology, Guilin 541006
  • Received:2022-06-29 Revised:2022-09-28 Online:2023-06-05 Published:2023-07-19

Abstract: Metamorphic mechanism has the advantages of multiple configurations. It will inevitably suffer internal impact during configuration transformation, and resonance will occur seriously. Its dynamic reliability is the key to ensure the normal operation of multiple configurations in engineering application. A controllable metamorphic palletizing robot for workpiece handling is taken as the research object. On the basis of establishing the elastic dynamic model of the working process of the robot by using the finite element method, the resonance frequency of the model is obtained by the improved L-P method. Multiple failure modes, uncertain variables and nonlinear vibration factors are considered. An analysis method for nonlinear dynamic reliability is proposed. In case study, the input angle deviations and output load are taken as uncertain variables, and the reliability variation after the configuration transformation of the robot is calculated. The calculated results are compared with those obtained by the neural network-based Monte-Carlo method and experimental data, the deviations are small. It shows that the proposed method has certain accuracy. Furthermore, considering the frequency of internal impact force as an uncertain variable, the range of uncertain variables corresponding to avoiding failure is obtained in the frequency range containing resonance. This work provides a reliability theoretical reference for the practical application of task-oriented metamorphic mechanisms.

Key words: metamorphic mechanism, palletizing robot, dynamic reliability, uncertain variables, nonlinear

CLC Number: