Experimental characterization and dynamic simulation of a quadra link independent rear automotive suspension system.

摘要

Quantification of the road input spectrum is determined by characterization studies of the various loading conditions (stresses, forces, moments, etc.) at the hard attachment points of an automobile suspension system. The hard attachment points of the suspension system are especially troublesome due to the random nature of the road-input spectrum.; The current research details the work and results of a quadra-link rear suspension system characterization study. The study involved the designing of a portable, stand-alone measurement system, as well as, the calibration and installation into the test vehicle where data collection was performed. The characterization study also involved the collection of test data and the design of experiments to characterize fully the response of the suspension system over a broad spectrum of road conditions.; Modeling that predicts the loading results experienced from actual road testing provided additional insight. The modeling identifies the response of the suspension system by characterizing the force transfer characteristics at the hard attachment points between the automotive body and the various suspension components. Two methods for modeling a specific case condition are detailed: A four degree of freedom MathCad mathematical model and a Working Model 3D dynamic simulation program model. Both models estimate the expected loads at hard attachment points, as well as the displacement, velocity, and acceleration response of the quadra-link suspension system. Both the MathCad model and the Working Model 3D dynamic simulation model provide authentication and correlation for the collected data as well as a useful tool for parametric design studies of the rear suspension system.