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Spectral-based Substructure Transfer Path Analysis of Steady-state and Transient Vibrations

Jiang, Wenwei

Abstract Details

2010, MS, University of Cincinnati, Engineering : Mechanical Engineering.
Automotive NVH (Noise, Vibration and Harshness) refinement can be implemented by utilizing TPA (Transfer Path Analysis) for steady state and transient vibrations analysis in frequency domain and time domain, respectively. In frequency domain, a new spectral-based multi-substructure theory is formulated to compute the frequency responses of mechanical systems that can be subdivided into multiple inter-connected substructures. The proposed spectral-based approach employs the free substructure frequency response functions at the coupling, response and excitation coordinates of interest to construct the complete system model using a single efficient coupling step. Even though this proposed spectral-based approach is conceptually similar to the conventional transfer path analysis, it is more extensive because of the ability to analyze systems with arbitrary numbers of substructures and coupling coordinates. Hence, the methodology can be applied to treat complex multi-substructure mechanical structures commonly found in automotive and aerospace systems. In the present study, several lumped parameters mass-spring-damper systems are analyzed to validate the proposed theory. On the other hand, in time domain, a new time domain transfer path analysis is formulated to deal with a class of weakly nonlinear, transient structural dynamics problems. It combines the versatility of the frequency domain transfer path analysis for tracking vibration transmission between substructures and the generality of the time domain analysis for treating nonlinear transient dynamic response. It is suggested that the developed approach can be applied to analyze practical transient dynamic problems in automotive systems. Also, the proposed time domain methods are applied to a lumped parameter mass-spring-damper dynamic system, and the results are shown to compare with the calculations results from the complete system method and a classical direct numerical integration routine.
Teik Lim, PhD (Committee Chair)
Ronald Huston, PhD (Committee Member)
David Thompson, PhD (Committee Member)
93 p.

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Citations

  • Jiang, W. (2010). Spectral-based Substructure Transfer Path Analysis of Steady-state and Transient Vibrations [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1273168454

    APA Style (7th edition)

  • Jiang, Wenwei. Spectral-based Substructure Transfer Path Analysis of Steady-state and Transient Vibrations. 2010. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1273168454.

    MLA Style (8th edition)

  • Jiang, Wenwei. "Spectral-based Substructure Transfer Path Analysis of Steady-state and Transient Vibrations." Master's thesis, University of Cincinnati, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1273168454

    Chicago Manual of Style (17th edition)