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Frequency-independent radiation modes of interior sound radiation: Experimental study and global active control

机译:室内声辐射的频率无关的辐射模式:实验研究和全球主动控制

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Active control of structural sound radiation is a promising technique to overcome the poor passive acoustic isolation performance of lightweight structures in the low-frequency region. Active structural acoustic control commonly aims at the suppression of the far field radiated sound power. This paper is concerned with the active control of sound radiation into acoustic enclosures. Experimental results of a coupled rectangular plate-fluid system under stochastic excitation are presented. The amplitudes of the frequency-independent interior radiation modes are determined in real-time using a set of structural vibration sensors, for the purpose of estimating their contribution to the acoustic potential energy in the enclosure. This approach is validated by acoustic measurements inside the cavity. Utilizing a feedback control approach, a broadband reduction of the global acoustic response inside the enclosure is achieved. (C) 2017 Elsevier Ltd. All rights reserved.
机译:结构声辐射的主动控制是克服低频区域中轻质结构的无源声学隔离性能差的有希望的技术。 主动结构声学控制通常旨在抑制远场辐射声功率。 本文涉及声辐射到声学外壳的主动控制。 提出了随机激发下耦合矩形板流体系统的实验结果。 使用一组结构振动传感器实时确定频率无关内部辐射模式的幅度,以估计它们对外壳中的声学势能的贡献。 这种方法通过腔内的声学测量来验证。 利用反馈控制方法,实现了外壳内的全局声学响应的宽带减小。 (c)2017 Elsevier Ltd.保留所有权利。

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