Abstract
AbstractThe work deals with usability of the half-power bandwidth method in the diagnostic testing of automotive shock absorbers. In all the simulation tests, the front and rear suspension system of a present-day medium-classmotor car was considered. At the first stage, calculations were made in the frequency domain for a linear “quarter-car” model with two degrees of freedom; then, simulations were carried out in the time domain with using a similar but strongly nonlinear model. In the latter case, actual characteristics (corresponding to those obtained from test rig measurements) of shock absorber damping, suspension and tire elasticity, sliding friction in the suspension, and “wheel hop” were considered. The calculations were carried out every time for twelve levels of viscous damping in the suspension system, which made 48 calculation series in total. The factors of gain in the vertical force between the tester’s vibration plate and the vehicle tire (relative to the input force applied) and the dimensionless coefficients of viscous damping in the suspension system, determined by the half-power bandwidth method, were thoroughly analyzed. The calculation results were presented in graphical form. Attention was also paid to the distortions caused by the force of inertia of the tester’s vibration plate.
Highlights
The technical condition of automotive shock absorbers is essential for vehicle motion safety and occupants’ comfort
In consideration of the above, the authors, when searching for new “on-vehicle” shock absorber assessment methods and having reviewed the literature, paid particular attention to publications [3, 6], where a suggestion was made to introduce some modifications to the EUSAMA testers and to use the half-power bandwidth method for determining the dimensionless coefficients of damping in the motor vehicle suspension system
The authors decided to assess the usability of this method in diagnostic testing of automotive suspension systems, where the relative damping coefficient reaches and even exceeds a value of 0.3
Summary
The technical condition of automotive shock absorbers is essential for vehicle motion safety and occupants’ comfort. In consideration of the above, the authors, when searching for new “on-vehicle” shock absorber assessment methods and having reviewed the literature, paid particular attention to publications [3, 6], where a suggestion was made to introduce some modifications to the EUSAMA testers and to use the half-power bandwidth method for determining the dimensionless coefficients of damping in the motor vehicle suspension system. This method is derived from modal analysis [7]. A novelty in relation to publications [3, 6] is here the use of a linear and a strongly nonlinear quartercar model
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
