Abstract
With the development of the traditional semi-active suspensions, different kinds of control algorithms have been proposed and applied, including skyhook (SH), acceleration-driven-damper (ADD), power-driven-damper (PDD), the mixed SH and ADD (SH-ADD), mixed SH and PDD (SH-PDD), and others. Among them, the vibration suppression in a wide frequency domain is realized by the SH-ADD or the SH-PDD, but the latter is more effective. Subsequently, the vehicle inertial suspension has been found to have better vibration suppression performance than the conventional suspension in the low frequency band. In order to suppress body vibration in a wide frequency domain to improve overall ride comfort, the inertial suspension using SH-PDD is proposed to further improve the vibration isolation performance due to its superiority of low frequency resistance in this article. First, an inertial suspension model of SH-PDD strategy is established, and the superior characteristics of an inertial suspension in a low frequency range are verified in numerical analysis. Then, the impact of the damping coefficient of the SH-PDD control strategy on the dynamic output performance of an inertial suspension is studied. In addition, the parameters of the proposed inertial suspension are optimized by means of the particle swarm optimization (PSO) method. By designing the error dynamic equation and sliding mode switching function, a sliding mode variable structure controller for an inertial suspension is finally constructed. Simulation results show that compared with the SH-PDD conventional suspension and the conventional suspension, the RMS value of body acceleration of the SH-PDD inertial suspension is reduced by 16.6% and 32.2% respectively, and the reduction is mainly in a low frequency range. Therefore, the proposed inertial suspension possesses better attenuation ability for the vehicle body vibrations to improve ride comfort.
Highlights
Since 1973, first proposed by Karnopp and Crosby, the semiactive vehicle suspension has been widely studied to improve ride comfort
To isolate a wider frequency vibration of the inertial suspension system, the SH and PDD (SH-PDD) strategy is combined with an inertial suspension, and the active control mechanism of the controllable inertial suspension is constructed to suppress the amplitude of the vehicle body acceleration in a wide frequency bands to further improve the vehicle ride comfort
Before deriving the SH-PDD control law of an inertial suspension, it is necessary to analyze the abilities of a vehicle suspensions from the perspective of the energy dissipation between the sprung mass and the unsprung mass
Summary
Since 1973, first proposed by Karnopp and Crosby, the semiactive vehicle suspension has been widely studied to improve ride comfort. In recent years, many control algorithms have been developed, but the performance improvement space of the semi-active conventional suspension has reached a bottleneck, which is caused by the "spring-damping" parallel inherent structure. Due to the low frequency resistance of the inerter, the inertial suspension can better suppress vibration to improve ride comfort compared with traditional suspension at the vehicle body bias frequency. To isolate a wider frequency vibration of the inertial suspension system, the SH-PDD strategy is combined with an inertial suspension, and the active control mechanism of the controllable inertial suspension is constructed to suppress the amplitude of the vehicle body acceleration in a wide frequency bands to further improve the vehicle ride comfort.
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