Active control of radiated sound using nearfield pressure sensing |
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作者姓名: | CHENKe'an YINXuefei |
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作者单位: | CollegeofMarineEngineering,NorthwesternPolytechnicalUniversityXi'an710072 |
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基金项目: | the National Natural Science Foundation of China(10274060)and the
Aeronautic Science Foundation of China(01I50307). |
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摘 要: | Based on nearfield sound pressure sensing to pick up error information, an approach for constructing active acoustic structure to effectively reduce radiated sound power at low frequency is proposed. The idea is that a nearfield pressure after active control is used as error signals and transformed into an objective function in adaptive active control process.Firstly sound power expression using near-field pressure radiated from a flexible structure is derived, and then three kind of nearfield pressure based active control strategies,i.e.minimization of radiated sound power, minimization of sound power for dominant radiation modes and minimization of sound power for modified dominant radiation modes are respectively presented and applied to active control of radiated single and broadband noise. Finally computer simulations on sound power reduction under three strategies are conducted and it is shown that the proposed active control strategies are invalid and considerable reduction in radiated sound power can be achieved.
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关 键 词: | 近场声压传感 主动噪声控制 声学系统 结构声学控制 |
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