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"Event-Triggered H∞Controller for a Semi-active Seat Suspension to Enha" by Xiangjun Xia, Nong Zhang et al.

This article proposes a disturbance observer-based event-triggered H∞ controller for a semi-active seat suspension that equips an advanced electromagnetic damper (EMD) system. Automated driving is one of the leading technologies of the automotive industry. However, automated vehicles (AVs) may increase the incidence of motion sickness (MS) and deteriorate motion comfort. This article investigates a semi-active seat suspension system and an advanced controller to improve the motion comfort of AVs. The disturbance force of the seat suspension has considerable influence on the system dynamic, and applying a constant model to describe the real-time disturbance force is unreliable. Therefore, a disturbance observer is designed to estimate the seat suspension disturbance force, and it is used to compensate the controller. The Bouc-Wen model is selected to compare with the disturbance observer and validate its effectiveness. Then an event-triggered H∞ controller combined with the disturba ....

Disturbance Observer , Electromagnetic Damper , Vent Triggered Scheme , Motion Sickness , Obust Controller , Eat Suspension ,

"Friction observer-based hybrid controller for a seat suspension with s" by Xiangjun Xia, Minyi Zheng et al.

Abstract
This paper proposes a hybrid controller for a seat suspension equipped with an advanced electromagnetic damper (EMD) system to meet the requirement with vibration isolation and energy saving. The friction of seat suspension has considerable influence on the system dynamic. Applying a constant model to describe the friction is unreliable due to the long term wear and tear. Therefore, an observer is designed to estimate seat suspension friction, and it is used to compensate for the frictional influence in a H controller. The friction observer applies the acceleration, relative displacement and circuit current, which are measurable in engineering. Then, a hybrid controller is further proposed, in which the low-frequency vibration is controlled with the friction observer-based H controller, and the system will switch to passive state with low damping at high frequency based on the dominant frequency of the vibration. In order to validate the effectiveness of the propose ....

Electromagnetic Damper , Riction Observer , Hybrid Control , Obust Controller , Eat Suspension ,