Applied Mathematics and Mechanics (English Edition) ›› 2017, Vol. 38 ›› Issue (9): 1233-1246.doi: https://doi.org/10.1007/s10483-017-2234-8

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Bifurcation characteristics analysis of a class of nonlinear dynamical systems based on singularity theory

Kuan LU1,2, Yushu CHEN1, Lei HOU1,3   

  1. 1. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China;
    2. College of Engineering, The University of Iowa, Iowa City, IA 52242, U. S. A.;
    3. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2016-10-16 修回日期:2017-02-15 出版日期:2017-09-01 发布日期:2017-09-01
  • 通讯作者: Kuan LU,E-mail:lukuanyyzb@163.com E-mail:lukuanyyzb@163.com
  • 基金资助:

    Project supported by the National Basic Research Program of China (973 Program)(No.2015CB057400),the National Natural Science Foundation of China (No.11602070),and the China Postdoctoral Science Foundation (No.2016M590277)

Bifurcation characteristics analysis of a class of nonlinear dynamical systems based on singularity theory

Kuan LU1,2, Yushu CHEN1, Lei HOU1,3   

  1. 1. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China;
    2. College of Engineering, The University of Iowa, Iowa City, IA 52242, U. S. A.;
    3. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
  • Received:2016-10-16 Revised:2017-02-15 Online:2017-09-01 Published:2017-09-01
  • Contact: Kuan LU E-mail:lukuanyyzb@163.com
  • Supported by:

    Project supported by the National Basic Research Program of China (973 Program)(No.2015CB057400),the National Natural Science Foundation of China (No.11602070),and the China Postdoctoral Science Foundation (No.2016M590277)

摘要:

A method for seeking main bifurcation parameters of a class of nonlinear dynamical systems is proposed. The method is based on the effects of parametric variation of dynamical systems on eigenvalues of the Frechet matrix. The singularity theory is used to study the engineering unfolding (EU) and the universal unfolding (UU) of an arch structure model, respectively. Unfolding parameters of EU are combination of concerned physical parameters in actual engineering, and equivalence of unfolding parameters and physical parameters is verified. Transient sets and bifurcation behaviors of EU and UU are compared to illustrate that EU can reflect main bifurcation characteristics of nonlinear systems in engineering. The results improve the understanding and the scope of applicability of EU in actual engineering systems when UU is difficult to be obtained.

关键词: rigid line inclusion, elastic circular inclusion, stress intensity factor, interface stress, universal unfolding (UU), bifurcation, engineering unfolding (EU), nonlinear dynamics, singularity

Abstract:

A method for seeking main bifurcation parameters of a class of nonlinear dynamical systems is proposed. The method is based on the effects of parametric variation of dynamical systems on eigenvalues of the Frechet matrix. The singularity theory is used to study the engineering unfolding (EU) and the universal unfolding (UU) of an arch structure model, respectively. Unfolding parameters of EU are combination of concerned physical parameters in actual engineering, and equivalence of unfolding parameters and physical parameters is verified. Transient sets and bifurcation behaviors of EU and UU are compared to illustrate that EU can reflect main bifurcation characteristics of nonlinear systems in engineering. The results improve the understanding and the scope of applicability of EU in actual engineering systems when UU is difficult to be obtained.

Key words: singularity, rigid line inclusion, elastic circular inclusion, stress intensity factor, interface stress, nonlinear dynamics, bifurcation, universal unfolding (UU), engineering unfolding (EU)

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