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| 1 | Fractional beamforming of dense spacing array for time-frequency mix显示文摘The model of time-frequency mixed processing and the towing experimental results airs discussed in the paper for the fractional beamforming of a dense spacing array. The results show that the theoretical model is in agreement with the experimental results and it can.be realized easily in the engineering mode. The Performance Figure of the experimental subarray system is increased about 17 dB in comparison with that of traditional array with halfwavelength spacing between elements under the same conditions, when the flow noise is a dominant component in the background noise received by a sub-array. | SHAN Bingyi ZHENG Guolun ZOU Tengrong (State Key Laboratory of Ocean Acoustics, Hangzhou Applied Acoustics Institute Hangzhou 310012) | 2000 | Chinese Journal of Acoustics2000，19，2： | 3 |
| 2 | 旋转运动声源的频率波动修正波束形成方法显示文摘针对前飞状态的旋翼气动噪声信号频率存在周期性波动,且频域波束形成方法只能应用于稳态声源的问题,提出一种频率波动声源的波束形成方法。该方法利用已知的声源频率变化规律进行频率修正,在时域将频率波动信号等效为单频信号,基于该单频信号进行波束形成声源定位,实现了旋转运动的频率波动声源准确定位。数值仿真结果表明,提出的方法能够在频率波动幅值为127 Hz的情况下准确呈现出声源分布情况.在旋翼模型的风洞试验中,利用提出的频域波束形成方法其声成像结果中声源最大能董位置均在旋转轨迹上,而未进行频率修正的波束形成方法结果无法准确呈现出声源的位置.该方法扩展了频域波束形成方法中的单频声源假设,实现了旋转运动声源在频率波动状态下的波束形成,适用于前飞状态下旋翼气动噪声源的声源定位。 | 高建正 陈正武 莫品西 蒋伟康 | 2021 | 声学学报2021，46，4： | 1 |
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