VEHICLE DYNAMICS: IDENTIFICATION IN THE FREQUENCY DOMAIN

FAHRZEUGDYNAMIK: IDENTIFIKATION IM FREQUENZBEREICH

A method to identify the behavior of nonlinear systems in the frequency domain was developed. If random signals are used as inputs the resulting frequency response is also a random signal due to the nonlinear effects. For composite frequency input signals, satisfying requirements on their phae angles, each spectral line is shown to be approximately a normally distributed random variable, the mean value of which is a linearized system, optimal in a mean-squares sense. The variance can be calculated via the ordinary coherence function. This approach was extended to multivariable systems. Using the multiple coherence, conditioned power spectral densities and partial coherence, the variation areas for each of elements in the frequency response matrix can be calculated, even in the presence of correlated inputs. The application of this method to vehicle dynamics is illustrated by an axle undergoing random excitation on a test bench.

• Supplemental Notes:
  • In Dfvir, System Identification in Vehicle Dynamics, p 141-152. Order as N88-26518/WTS.
• Corporate Authors:

  Technical University of Darmstadt, West Germany

  Fachbereich Regelsystemtheorie
  61 Darmstadt,   Germany 
• Authors:
  • Tews, V
• Publication Date: 1987

Language

• German

Media Info

• Pagination: 12 p.

Subject/Index Terms

• TRT Terms: Frequency response; Multivariate analysis; Nonlinear systems; Vehicle dynamics
• Uncontrolled Terms: Nonlinearity
• Subject Areas: Data and Information Technology; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 00480530
• Record Type: Publication
• Source Agency: National Technical Information Service
• Files: TRIS
• Created Date: Mar 31 1989 12:00AM