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題 名 | The Performance of Accelerometers, Microphones and PVDF Sensors in Active Structural Acoustic Control: Theoretical Analysis=加速度計、麥克風和壓電薄膜在主動結構噪音控制之評估 |
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作 者 | 王柏村; | 書刊名 | 力學 |
卷 期 | 10:3 1994.09[民83.09] |
頁 次 | 頁191-199 |
分類號 | 445.6 |
關鍵詞 | 加速度計; 麥克風; 壓電薄膜; 聲音輻射; 控制; Acceleroneter; Microphone; PVDF; Sound radation; Control; |
語 文 | 英文(English) |
中文摘要 | 本文理論性探討加速度計、麥克風、壓電薄膜在主動結構噪音控制之效果,一諧 振動點力作用於一無限長剛體屏障之簡支樑為干擾源,壓電驅動器黏貼於樑表面則作為控制 源,以減小樑之聲音輻射,為達成聲音輻射控制,分別使用幾種不同的感應器,採用一最佳 化程序,以求得輸入壓電驅動器之最佳電壓,使得成本函數最小化,此成本函數則為誤差感 應器信號之最小平方值。結果顯示,如果適當地選擇驅動器及感應器可以減小樑之聲音輻射 ,此外,麥克風比加速度計或壓電薄膜在聲音輻射控制更有效果,但是由於壓電薄膜輕巧且 低成本使得比加速度計或麥克風更有實用價值。 |
英文摘要 | This paper analytically demonstrates the performance of accelerometers, microphones and PVDF sensors in active structural sound radiation control. A harmonic point force disturbance applied to a simply-supported beam mounted with an infinite rigid baffle is considered as the primary source. The piezoelectric actuators bonded to the beam surface are used as secondary sources to attenuate the sound radiation through the beam. Different types of error sensors are used to perform active coutrol to reduce sound radiation level. An optimal process is applied to obtain the input voltages of piezoelectric actuators so that the cost funciton can be minimized. The cost function which is the least mean square value of the sensor signal is constructed based on the type of error sensor. Results show that a reduction of sound radiation through the beam can be successfully achieved, if the proper type, number and position of sensors and actuators are selected. Additionally, a comparison shows that microphones provide more effective control of sound radiation than accelerometers and PVDF sensors; however, PVDF sensors have practical advantages over accelerometers and microphones because of their low cost and light weight. |
本系統中英文摘要資訊取自各篇刊載內容。