Affiliation:
1. Warsaw University of Technology, Faculty of Transport , Koszykowa Street 75 , Warsaw , Poland
2. Łukasiewicz Research Network – Automotive Industry Institute PIMOT , Jagiellońska Street 55 , Warsaw , Poland
Abstract
Abstract
The 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.
Subject
Electrical and Electronic Engineering,Mechanical Engineering,Aerospace Engineering,General Materials Science,Civil and Structural Engineering,Environmental Engineering
Reference9 articles.
1. Stańczyk TL, Jurecki R. [Comparative analysis of testing methods of hydraulic shock absorbers]. Proceedings of the Institute of Vehicles, Warsaw University of Technology. 2014;4(100):25-45. Polish.
2. Zdanowicz P. Assessment of vehicle shock-absorbers’ condition having considered dry friction in the suspension [dissertation]. Warsaw: Warsaw University of Technology; 2012.
3. Calvo JA, Diaz V, San Román JL. Establishing inspection criteria to verify the dynamic behaviour of the vehicle suspension system by a platform vibrating test bench. International Journal of Vehicle Design. 2005;38(4):290-306.
4. Lozia Z, Zdanowicz P. Simulation assessment of the impact of inertia of the vibration plate of a diagnostic suspension tester on results of the EUSAMA test of shock absorbers mounted in a vehicle. IOP Conference Series: Materials Science and Engineering. 2018;421(2):1-10.
5. Lozia Z, Mikołajczuk J. Ocena przydatności testu diagnostycznego stanu amortyzatorów zamontowanych w pojeździe, wykorzystującego wymuszenie kinematyczne w kontakcie koła z podłożem. The Archives of Automotive Engineering. 1997;2:3-24. Polish.