This paper presents an example of a vibration control system for a semi-active seat suspension system. The object of the study is a mass-produced seat with a viscoelastic suspension system, whose vibration isolation properties are shaped through semi-active control of the magneto-rheological damper force. The designed control system and the procedure for optimizing its settings contribute to the simultaneous minimization of conflicting vibration isolation criteria: the seat vibration transmissibility coefficient and the relative displacement of the suspension system.The operation of working machines exposes their operators to the harmful effects of vibrations, which most often result from the machines moving over uneven surfaces [1]. The lack of elements reducing the harmful effects of vibrations in machines without suspension (the road wheels are directly connected to the vehicle chassis) means that solutions to the vibration isolation problem must be sought only in the seat suspension [2].
The vibrations of the operator’s cabin floor often lie within the frequency ranges of the seat’s natural vibrations and, in many cases, are unfortunately amplified (the resonance problem of passive seat suspensions) rather than damped [4]. (…)
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Source: Logistyka Magazine 2/2011