and its successive differentiations without going through the numerical differentiation to avoid the numerical errors. It is shown that the method of superposition of harmonics is a flexible and powerful technique for generating the Gaussian random signal from spectral description as it can handle any practical shape of spectral density not only continuous but discrete split spectrum also. In addition, the use of higher sampling frequency has negligible effect on the contribution of high frequency spectral either in elevation or, especially in gradient of the generated profile as contrast to the method of white noise filtration.
A novel control scheme for the active suspension in a 4-DOFs half-car model is presented. A force cancellation control scheme is used to isolate the sprung and the unsprung masses. Skyhook damper and virtual damper concepts are employed to stabilise the sprung and unsprung masses respectively. Road-following springs are applied for the sprung mass to follow the trend of the road surface condition and to maintain the suspension stroke within a reasonable range. For efficiency, genetic algorithm is employed to search for the parameters like damping ratio and spring constant to achieve an optimum trade off among ride comfort, handling quality, and suspension stroke simultaneously for random input. Computer simulations are performed using MATLAB software to verify the proposed control scheme and effectiveness of the applied genetic algorithm.
This paper presents a half-car model (4-degrees-of-freedom) employing nonlinear passlve sequential damper. The vibration isolation and transmrssibility effect on the vehicle's centre of gravity (C.G.) has been studied. The results have been compared for transmissibility, displacement, and velocity transient response for half-car model having nonlinear passive sequential hydropneumatic damper under different terrain excitation.
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