The interaction mechanism between violin bow and string is very complicated due to the stick-slip friction action, and it forms a complex vibration system. In this paper, the vibration characteristics of violin strings are studied through theoretical analysis and experimental method. In order to measure the three dimensional vibration configuration of the strings, an optical noncontact measurement system based on high-speed photography was designed. Some color marks are set on string and then get the vibration images when bow and pluck violin string. As a result, the string vibration characteristics of two different action mechanisms of plucked and bowed string are investigated, including vibration displacement, velocity and space trajectory of the mark point on string. After compare the displacement curves data among the different points on string, the variety of the ratio of positive process time to negative time of vibration sawtooth waveform are studied, and also the formation process of vibration enveloping curve. Finally the factors affecting the vibration amplitude of violin string are analyzed.
Key words
string vibration /
high speed video photography /
Helmholtz motion /
stick-slip friction /
motion track
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