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dc.contributor.author張芸瑄en_US
dc.contributor.authorChang, Yun-Hsuanen_US
dc.contributor.author金大仁en_US
dc.contributor.authorKam, Tai-Yanen_US
dc.date.accessioned2014-12-12T02:36:03Z-
dc.date.available2014-12-12T02:36:03Z-
dc.date.issued2012en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#GT070051039en_US
dc.identifier.urihttp://hdl.handle.net/11536/72811-
dc.description.abstract平面揚聲器在中音域附近易有一聲壓落差,稱為音谷,音谷的產生會影響揚聲器表現。因此本文利用附加對稱質量及改變激振方法改善聲壓曲線,減少音谷產生。以古典板理論及Rayleigh-Ritz數值方法結合總域極小值最佳化理論設計附加對稱位置質量的最佳位置,探討碳纖揚聲板附加質量對聲壓曲線及振動模態之影響,達到欲改善的聲壓區間曲線平滑,且探討該質量位置對振動模態之影響。本文亦研究片狀激振器之製作,此新型之激振器可隨意更改激振方式與位置,在揚聲器的研製上可有相當大的應用,以最佳化方法找出最佳之激振位置,另依分析的結果實際製作出揚聲器並量測其聲壓曲線,結果顯示其確有較平滑的聲壓曲線表現。 本文歸納出可依據不同尺寸之揚聲板選擇適當的方法改善聲壓曲線。zh_TW
dc.description.abstractPanel-speakers may have dips in mid frequency range on the sound pressure level (SPL) curve. In general, such dip can be harmful to the sound quality of the loudspeakers. In this thesis, the mid-frequency SPL dips are suppressed or eliminated using two different methods. In the first methods, point or distributed masses are attached to the plate at different locations to improve the smoothness of the SPL curve in a specific frequency range. An optimal design method is used to determine the locations of the masses. In the optimal design process, the vibration analysis of the sound radiation plate is accomplished using the Rayleigh-Ritz method, the sound pressure produced by the sound radiation plate is calculated using the first Rayleigh integral, and the optimal excitation location is determined using a global optimization technique. In the second method, the K-exciter is used to excite the sound radiation plate. The advantages of K-exciter are that it can be put anywhere on the plate and the shape of excitation force can be in any form. The optimal excitation locations are obtained in the optimal design. The feasibility and applications of the proposed methods have been validated by experimental results.en_US
dc.language.isozh_TWen_US
dc.subject附加質量zh_TW
dc.subject激振位置zh_TW
dc.subject最佳化zh_TW
dc.subject平面揚聲器zh_TW
dc.subjectMass attacheden_US
dc.subjectLocation of Excitaionen_US
dc.subjectOptimalen_US
dc.subjectPanel-Speakeren_US
dc.title矩形揚聲板受不同激振方式之最佳化設計zh_TW
dc.titleOptimal Design of Rectangular Laminated Composite Sound Radiators under Different Excitationsen_US
dc.typeThesisen_US
dc.contributor.department機械工程系所zh_TW
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