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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/34049

Title: 小提琴琴弦之摩擦振動的時頻分析
Authors: 周昭昌;林厚丞;范哲維
Contributors: NTOU:Department of Mechanical and Mechatronic Engineering
Keywords: 希爾伯特-黃轉換,時頻分析,摩擦振動,小提琴,自相關函數
Hilbert-Huang transform,time-frequency analysis,friction-induced vibration,violin,autocorrelation function
Date: 2012-06
Issue Date: 2013-10-03T03:14:21Z
Publisher: 第二十屆中華民國振動與噪音工程學術研討會(CSSV20th),六月十六日,大葉大學,台灣彰化
Abstract: 本研究透過特別設計的實驗裝置,在控制各種弓毛狀態,配合不同的負載與運弓速度之操作條件,以非接觸式雷射都卜勒技術量測小提琴弦(G弦與E弦)的摩擦振動訊號。運用希爾伯特-黃轉換處理,這種具有非線性與非穩態特性的時頻訊號,經總體平均模態分解技術處理成數個本質模態函數分量後,再計算各分量的頻譜及其自相關函數。實驗結果除了說明弓毛塗抹松香以提高接觸表面黏滯力的重要性外,亦探討琴弦之振動特性與音質的關係,最後並根據實驗結果歸納出評價琴弓品質的判斷準則。
This study used a unique test rig to measure the friction-induced vibration of a violin's strings by a non-contact laser Doppler vibrometer. The state of the contact surface, the normal load, and the sliding speed of the bow on two different strings, i.e. G and E strings, were investigated. Hilbert-Huang transform with ensemble empirical modal decomposition was implemented to calculate the intrinsic modal functions of these vibration signals. The role of robin on the bow and the characteristic of the string's vibration as the origin of a violin's sound were discussed. In conclusion, the guidelines for evaluating the quality of a violin's bow were addressed.
Relation: I-03, pp.294-300
URI: http://ntour.ntou.edu.tw/handle/987654321/34049
Appears in Collections:[機械與機電工程學系] 演講及研討會

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