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Generation of transfer functions of subsystems using the test results of the whole system

Saadat Foumani, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. This paper presents a new experimental-numerical method for deriving the transfer functions of a half-automobile model, containing: chassis, body, engine, engine mount and steering wheel, with five degrees of freedom. In this method different parts of system are not required to be disassembled from the main system and the transfer functions of subsystem are obtained through testing of the whole system. This method is based on the experimental results and does not need a mathematical model of the half-automobile. In this method, transfer functions of various parts of chassis are calculated through obtaining the response of secondary elements mounted on the chassis to the displacement input from the road and the force of engine, in different frequencies. This is important especially when the large and heavy systems cannot be easily separated from the main system. The method is applied to a half-automobile model in a simulated test and the results are compared with the exact values. The comparison shows a good compatibility between the transfer functions obtained from the method and those of the exact values. Also the effect of noise on the computations is considered and a way to decrease the effect of noise on the computed transfer functions is suggested. © 2009 Society for Experimental Mechanics Inc
  4. Keywords:
  5. Half-automobile model ; Different frequency ; Engine mount ; Good compatibility ; Heavy systems ; Linear subsystems ; Simulation ; Steering wheel ; Chassis ; Exhibitions ; Mathematical models ; Structural dynamics ; Transfer functions
  6. Source: Conference Proceedings of the Society for Experimental Mechanics Series, 9 February 2009 through 12 February 2009 ; 2009 ; 21915644 (ISSN) ; 9781605609614 (ISBN)
  7. URL: http://semimac.org/wp-content/uploads/2015/12/sem.org-IMAC-XXVII-Conf-s75p004-Generation-Transfer-Functions-Subsystems-Using-Test-Results-Whole.pdf