Global sensitivity analysis of hydraulic system parameters to a hydraulically interconnected suspension's dynamic responses

A 4- DOF anti-roll half-car model was used to derive a mechanical-hydraulic coupled system's dynamic equations in frequency domain here. The system's frequency response functions and a road surface imput model were set up to achieve its responses,such as,bounce acceleration power spectral density and roll acceleration power spectral density. By applying a method of global sensitivity analysis called Sobol,the levels of sensitivities of hydraulic parameters to bounce response and roll response were calculated. The obtained results indicated that the valves connected to hydraulic chambers have a large impact on bounce modal vibration and the accumulator and the valves connected to it make a large impact on roll modal vibration. The study results provided a theoretical basis for car ride estimation and further parametric optimization of hydraulically interconnected suspensions.