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題名 | The Evaluation of Cost Functions for Active Sound Radiation Control of a Simply-Supported Beam=簡支樑之主動聲音輻射控制之成本函數評估 |
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作者 | 王栢村; | 書刊名 | 中華民國音響學刊 |
卷期 | 4:1 1996.12[民85.12] |
頁次 | 頁39-61 |
分類號 | 448.11 |
關鍵詞 | 簡支樑主動聲音輻射控制; 成本函數; 感測技術; |
語文 | 英文(English) |
中文摘要 | 本文基於現有感測技術提供選用成本函數之分析,考慮一具有無長剛體屏障之簡 支樑受一簡諧點力作用,應用最小平方前饋控制方式,以壓電驅動器為控制源,分別以加速 度計、麥克風或壓電膜為感應器,也考慮理想式感應器,如振動能量、聲音輻射能量或超音 波波數,以及以一系列之加速度計或壓電薄膜感應器,取其傅立葉波數轉換以作波數模式感 應,本文共定義十種成本函數配合作結構聲音輻射控制,針對共振激振為例,分別以聲音輻 射指向圖及波數域分析,探討其控制特性,並對不同之激振頻率以比較其控制效果,本文基 於不同之感測技術,提供一系統性選擇成本函數之分析,應用於樑聲音輻射之主動控制,並 評估不同成本函數之控制效果,將來亦可應用至其它結構系統。 |
英文摘要 | This paper provides a general idea for selecting cost functions regarding to the availability of sensing techniques. A simply-supported beam with infinite rigid baffle subject to harmonic point force is considered. The PZT actuator is applied as control inputs in conjunction with the adoption of LMS leedforward control algorithm. Either accelerometers, microphones or strip PVDF film sensors can be used as error sensors. Ideal sensors such as vibrating energy, radiated acoustic power and supersonic wavenumber transform components are also considered. In particular, the discrete Fourier wavenumber transorm (DFWT) approach with the use of a series of accelerometers or PVDF film sensors is also presented and compared. Ten types of cost functions are defined and to be minimized in order to perform sound radiation control. Control mechanisms are shown through the radiation directivity patterns and wavenumber analysis for an on-resonance excitation case. A wide range of different excitatiion frequencies is also presented to show their control effectiveness. This work provides a systematic approach for selecting the cost function regarding to the different sensing approaches for active sound radiation control of the beam. The control characteristics of different cost functions are also shown. |
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