微型揚聲器與音腔之動態建模與實驗驗證

Dynamic Modeling and Experimental Verification of a Micro-speaker with Enclosure

許龐淵(Yuan Hsu-Pang)

指導教授 ： 趙昌博

中原大學/工學院/機械工程研究所/碩士(2006年)

https://doi.org/10.6840/cycu200600879

摘要

本研究之目的主要為分析並探討改變振膜皺摺角度( corrugation angle )之情況下，此一因素對頻率響應之影響。以及動圈式微型揚聲器( Moving-coil Type Micro-speaker )在流體和固體耦合( fluid-structure interaction )之情況下分析。本文探討結合動態、電磁、聲學效應之下，分析微型揚器之振膜在不同的皺摺角度時，其頻率響應圖之曲線分佈，在論文最後亦會提出討論造成此部份之曲線趨勢背後之物理因素。此外，為了使模擬微型揚聲器之頻率響應圖與實驗結果在高頻部份相互得到驗證，在此，本研究亦提出了微型揚聲器振膜與其前後音腔之流-固耦合作用分析。

關鍵字

流-固耦合 ； 皺摺角度 ； 動圈式微型揚聲器 ； 音腔 ； 振膜

並列摘要

In this study, the simulation results of the diaphragm of the micro-speaker considered with different corrugation angles, 15, 45, 75 degrees, respectively, are presented in the study using dynamic analysis, which includes electromagnetic, mechanical, and acoustical modeling for respective subsystems. The frequency responses of the three cases can be obtained and discussed the discrepancy of the results. On the other hand,　the moving-coil type micro-speaker considered with fluid-structure interaction of the diaphragm and the air within the micro-speaker is also investigated. In order to predict the response of the experiment data at high frequency, the air enclosure within the micro-speaker is taken into account. To simplify the building process of finite element model of the air enclosure, the corrugated profiles of the diaphragm is neglected. The simulation result can be obtained via ANSYS harmonic analysis and compared with the experiment data.

並列關鍵字

air enclosure ； fluid-structure interaction ； corrugation angles ； moving-coil type micro-speaker ； diaphragm

參考文獻

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