Semi-Active Vibration Control Based on a Smart Exciter with an Optimized Electrical Shunt Circuit

Yi Wang,Thomas Kletschkowski

doi:10.3390/app11209404

Yi Wang, Thomas Kletschkowski

Open Access

https://doi.org/10.3390/app11209404

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Journal: Applied Sciences	Publication Date: Oct 11, 2021
Citations: 2	License type: CC BY 4.0

Affiliation: HAW Hamburg, Universität Hamburg

Abstract

A smart exciter coupled to cabin panels can be used as a new type of loudspeaker for emergency announcements in the aircraft cabin. The same device can also be used as a semi-active vibration control system which is effective in reducing the amplitude of structural vibration. The objective of this paper is to investigate the potential of vibration reduction using a smart exciter in combination with an optimized resistive-inductive shunt circuit, which serves as an absorbing network. First, the vibration reduction effect has been analyzed numerically using a simulation framework realized with COMSOL and MATLAB/Simulink. In a second step, the reduction effect of the smart exciter together with a resistive-inductive shunt circuit, which is produced by the Center of Applied Aeronautical Research (Zentrum für Angewandte Luftfahrtforschung GmbH, Hamburg, Germany), has been investigated experimentally. The results presented here prove that the smart exciter together with a resistive-inductive shunt can be highly effective in reducing structural vibrations.

Highlights

Published: 11 October 2021Flight comfort is greatly influenced by the noise level in the aircraft cabin
The advantages of using a smart exciter (SE) as a vibration reduction device are: (i) it adds almost no additional weight to the cabin, (ii) it requires no additional power supply and (iii) several single systems can be used at the same time without crosscoupling effects (known from multiple-input-multiple-output (MIMO) systems applied for active control of sound) because noise reduction is obtained by dissipation of kinetic energy
We find that the SE with the RL-shunt that the vibration reduction effect is most at the first Amplitude natural frequency, can reduce the vibrations in significant a short period of time

Summary

Introduction

Flight comfort is greatly influenced by the noise level in the aircraft cabin In this respect, it is always an important aim to reduce the level of noise in the cabin, which is produced by the propulsion system and aero-acoustic effects. A smart exciter (SE) [1] attached to the cabin sidewall panels can function as a new type of loudspeaker for emergency announcements in the aircraft cabin [2]. It may act as a semi-active system for the reduction of vibrations in aircraft structures. It is easier to adapt to different problems than a purely active system, as described in [3,4], due to the missing cross-coupling as well as its low energy and cost requirements [5,6]

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