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題名 | 力木對古箏面板自由振動的影響=Influence of Bass Bar on the Free Vibration of Ku-Zheng Top Plate |
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作 者 | 鄭德淵; 辛玫芬; 陳周宏; | 書刊名 | 林產工業 |
卷期 | 26:4 2007.12[民96.12] |
頁次 | 頁245-253 |
分類號 | 436.187 |
關鍵詞 | 古箏; 力木; 自由振動; Ku-Zheng; Bass bar; Free vibration; |
語文 | 中文(Chinese) |
中文摘要 | 中國之彈撥樂器的面板材料大多使用泡桐類(Paulownia),目前的古箏幾乎都於面板背面黏貼一至二根的力木。古箏面板長103~130 cm、寬30~34.5 cm,內部置有三個音樑將箏體隔成四個小空間;古箏的彈奏位置(激發琴弦振動處)靠近前岳山處,即驅動力來源到面板尾端的振動距離約100~125 cm。影響面板優劣的主要因素是傳振速度,次為振動模式的影響。力木的設置有助於箏體結構的補強作用,其存在亦影響琴板的振動性質。進行面板自由振動的測試研究結果顯示,古箏面板內面黏貼力木,其振動頻率響應在70~400 Hz之間增強。不論力木的黏貼位置為何,均以順時鐘旋轉30°角(與雁柱排列方向相同)為佳。而以力木位置L33的響應最佳(以激振點5比較)。而力木位置距離高音頻區邊板和岳山(前樑)愈遠,面板的自由振動反應則愈不明顯。 |
英文摘要 | Paulownia is mostly used in the top plate of Chinese plucked stringed musical instruments, current Ku-Zheng always pastes one or two bass bar at the back of the top plate. The top plate of Ku-Zheng has 103~130 cm in length, and 30~34.5 cm in width, separated the body into four small spaces by three inside sound beams. The playing position of the Ku-Zheng (stimulation string vibration place) is near Yue Shan, distance between the driving power source and the end panel vibration is about 100~125 cm. The major influence factor for quality of top plate is the speed of vibration transmission, then the vibration mode. Support with the bass bar is helpful to the reinforcement structure function of the Ku-Zheng's body, its existence also effected the vibration properties of top plate. The conduct of the free vibration tests of top plate, the results are as fallows: with the addition of bass bar to the back of Ku-Zheng's top plate, its frequency response area increased between 70~400 Hz. No matter where the bass bar does paste to, the 30° clockwise rotation (and same bridge orientation) is better. While the position of bass bar is at L33, it has the best response (compared with rapping point #5). The farther the bass bar position from the high sidewall and Yue Shan (front beam) the free vibration response of top plate is not very significant. |
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