The flow induced oscillation in a cavity exposed to external high speed flow and its suppression by means of sound excitation at the leading edge of the cavity are experimentally studied.

实验研究了矩形空腔在外部高速气流作用下诱导的空腔内流动振荡问题，以及从空腔前缘加入纯音声激励以抑制空腔内流动振荡的技术。

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Studies of the sound radiation and vibration of the ring stiffened cylindrical shell under the circumferential excitation are important to predict the noise of the underwater naval craft.

周向激励下加筋圆柱壳体振动和声辐射特性的研究是预测水下航行器壳体噪声的关键环节。

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With forceful, clear, and smooth reverberated sound as well as special harmonic excitation functions, the noise frequency domain is obviously reduced, thus playing vocal perfectly and easy.

它不仅混响声音雄浑、清晰流畅，而且特有的谐波激励功能，能明显改善噪音的频域，使人的声音更加完美，演唱起来更加轻松。

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