Dynamic response simulation through system identification.

Roberts, David E and Hay, Neil (2006) Dynamic response simulation through system identification. Journal of Sound and Vibration, 295 (3-5). pp. 1017-1027. ISSN 1095 8568


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Nonlinear dynamic systems, such as those associated with structural testing of vehicles, are considered. The vehicle, or a substructure, is mounted in a test rig that is normally driven by servo-hydraulic actuators. The specimen and test rig form a nonlinear dynamic system. These test systems assure the durability of vehicles by reproducing a structural response time history that has been measured in a road test of a vehicle. For this, a force or displacement input to the actuators’ control system must be determined as a function of time.

Current practice employs an iterative algorithm, using a frequency response function to represent the system. The conventional iteration is a particular version of well established numerical techniques for solving nonlinear systems. However, the success of the iteration is dependent on the degree of nonlinearity and on the level of noise in the signals coming from the system.

This paper advocates identifying the system to improve its representation in the iterative algorithm. The theory underpinning the alternative algorithm is presented and a comparison is made between the performances of the two algorithms, using computer simulations based on Duffing's equation. These simulations show that, even for this simple model, the alternative algorithm is faster, more reliable and more tolerant of response noise.

Item Type: Article
Print ISSN: 1095 8568
Related URLs:
Uncontrolled Keywords: Non-linear dynamic systems; Vehicle test-rig; Frequency responses; Solutions; Iterative algorithm; Numerical analysis; Noise effects; System noise; New algorithm; Duffing's equation; Computer simulation; Evaluation;
University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
Dewey Decimal Subjects: 600 Technology > 620 Engineering > 629 Vehicle engineering
500 Science > 510 Mathematics > 518 Numerical analysis
000 Computer science, information & general works > 000 Computer science, knowledge & systems > 004 Data processing & computer science
Library of Congress Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Q Science > QA Mathematics > QA76 Computer software
Item ID: 1858
Depositing User: RAE Import
Date Deposited: 16 May 2008 09:06
Last Modified: 21 Mar 2013 14:09

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