Active control of vehicle’s interior sound field by using multichannel H_∞ robust controller

Abstract

The sound level inside an automobile cabin plays a major role in the passengers’ comfort. Active noise control has been widely used to reduce the sound level inside the car cabin. This article presents a design of an active and robust sound control system that can still be efficient despite the changes inside the passengers’ compartment caused by the movement of the occupants. Initially, the coupled acoustic structural analysis is done on a simplified model of an automobile cabin by using finite element and modal coupling methods. Then, the uncertainty of the sound field inside the car, due to the presence of the occupants and the displacement of their heads, is investigated. A multi input multi output robust feedback control strategy, using the H∞ method and considering the unstructured uncertainty of the acoustic structural system, is proposed to reduce the sound pressure level at the ears of all the occupants. In order to achieve performance targets in a broad bandwidth and to reduce the waterbed effect, an optimization is performed on the weight function coefficients. The results show that in the frequency range of 0–334 Hz, the controller has an acceptable performance which is robust to changes in the interior sound field.

Decentralized robust control of a vehicle’s interior sound field

“…The performance of the designed controller is compared with the multiple-input and multiple-output (MIMO) centralized controller which is investigated in the authors’ previous work (Ghanati and Azadi, 2020). Figures 12 to 19 show the SPL before and after decentralized and centralized control at the passengers’ ear positions.…”

Design, analysis, control simulation, and experiment of novel electromagnetic hybrid vibration absorber

“…the performance of the feedback controller remained balanced in the frequency domain. 25 In these frequency bands, EHVA can work in passive state to obtain better damping effect.…”

Research on the parameter design and calibration and control of EV in-vehicle active sound generation system

“…Thanks to the fact that the technology in ASGS is constantly upgrading, the sound of vehicle's interior becomes more enjoyable. Ghanati, G. et al [ 18 ] designed an sound control system, and proposed a robust feedback control strategy using multiple inputs and outputs to reduce SPL experienced by all occupants. Anthony, M. et al [ 19 ] introduced an ANC system, performing real-time experiments.…”