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題 名 | Hybrid Active and Passive Control for Structural Sound Radiation=結構聲音輻射之混合主動與被動控制 |
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作 者 | 王栢村; | 書刊名 | 中華民國音響學刊 |
卷 期 | 2:2 1994.07[民83.07] |
頁 次 | 頁1-16 |
分類號 | 334.5 |
關鍵詞 | 樑; 聲音輻射; 控制; Beam; Sound radiation; Control; |
語 文 | 英文(English) |
中文摘要 | 本文探討一具有無限長剛體屏障簡支樑的聲音輻射之混合主動與被動控制,假設 一諧振點力作用於結構為干擾源,集中質塊為被動控制元件,加於結構可改變結構之模態性 質,壓電驅動器黏貼於結構上作為控制源,而以壓電薄膜作為近場結構感應器,主動控制係 以最小平方前饋控制為主,以一最小化程序計算輸驅動器之最佳控制電壓,若將被動控制與 主動控制同時作用稱為混合控制。聲音輻射能量在頻率之響應作為評估被動、主動和混合控 制之控制效果,結果顯示主動控制在接近共振邀振頻率時可達到良好控制,如能適當選用被 動元件,混合控制可比主動或被動控制達到較佳之聲音輻射控制,本文証明了結合主動與被 動控制在結構聲音輻射之混合控制的可行性。 |
英文摘要 | This paper analytically studies the hybrid active and passive control of sound radiation through a simply-supported beam mounted with an infinite rigid baffle. A harmonic point force is applied to the strudture as the primary source (disturbance). A concentrated mass, a passive element, is added to the structure to restructure the modal properties. The piezoelectric actuator bonded to the structure surface is applied as the secondary source (control force), while the PVDF film is used as the near-field structural sensor. Active control is performed in conjunction with the use of LMS feedforward control algorithm. A minimization process is employed to calculate the optimal control voltage applied to the actuator. Both the passive element and active control are applied simultaneously and termed as the hybrid control. The radiated power verse ercitation frequencies is plotted to evaluate the effectiveness of passive, active and hyrid control. Results show that active control can provide sufficient control for excitation near the resonance. With the proper selection of pasive element, hybrid control can achieve better sound radiation control than passive or active control alone. This work demonstrates the feasibility to combine the active control mean and passive element applied to structural sound radiation control. |
本系統中英文摘要資訊取自各篇刊載內容。