A validated suspension seat equipped with a controllable MR damper is employed to investigate the performance potentials of a controllable MR damper, and to synthesise and evaluate the proposed control algorithms. A 'hi-lo' semi-active control algorithm (SC) is formulated on the basis of the well-known skyhook control to modulate the control current from 'zero' state to the 'hi' state, which is proportional to instantaneous relative velocity response of the suspension. Owing to the significant transient oscillations caused by current switching, a CM algorithm is proposed to achieve smoother transition from 'hi' to 'lo' state. The results attained under deterministic and random excitations of continuous and transient nature revealed the effectiveness of the smoothing function in limiting the switching oscillations. Furthermore, the SC damping suspension resulted in superior performances under harmonic, transient and random vehicular excitations. It is concluded that a gain value of 3 would yield adequate compromise between the vibration attenuation and end-stop impact performance of the suspension. In order to further improve the shock attenuation performance, an integrated control scheme is synthesised by introducing a relative position control to the semi-active skyhook-based control algorithm. The results show that the integrated control scheme could improve the shock attenuation performance of seat under high intensity excitations by limiting the frequency and severity of end-stop impacts. The proposed IC algorithm does not affect the suspension performance under lower intensity excitations. A HIL test platform was developed in the laboratory to evaluate the performance characteristics of the proposed 'hi-lo' skyhook-based controller (SC). Experiments were conducted to achieve the measured responses of the suspension seat with the proposed SC control under harmonic, transient and random vehicular excitations of different magnitudes. The SC damping suspension resulted in superior performances under different excitations. The results generally revelead good agreements between the computed and measured results. The results also reveal the role of the controller gain and the effectiveness of the semi-active control in enhancing both the shock and vibration isolation performance.


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    Title :

    Synthesis of a semi-active suspension seat for attenuation of Whole-Body Vibration and shock


    Additional title:

    Synthese eines Sitzes mit einer halbaktiven Federung zur Ganzkörperschwingungs- und Stoßbegrenzung


    Contributors:

    Published in:

    Publication date :

    2008


    Size :

    19 Seiten, 10 Bilder, 1 Tabelle, 24 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English