丝鸣的特征和机理  

Characteristics and Mechanism of Scrooping Sound of Silk

作　　者：武谦[1] 冯志华[1] 冯鸿生 郭佩和 

机构地区：[1]苏州丝绸工学院,苏州215005

出　　处：《纺织基础科学学报》1991年第3期234-244,共11页

摘　　要：对丝鸣频谱的测定和理论分析得出: 1 丝鸣振动主要由粘滑振动(S-S振动)、自由衰减振动(F-V振动)和特征高频振动①(S-C振动)组成。 2 丝鸣鸣音主要取决于F-V及S-S振动,属中低频音,S-C振动对鸣音的影响极小。 3 建立了丝鸣波动方程,并导出了粘滑周期等有关物理量的理论计算公式。 4 产生粘滑振动的临界条件应该是μ_s-μ_k>0。In this study a measurement instrument of scrooping sound has been developed. The following results were obtained by means of measurement and analysis of the frequency spectrum of scrooping sound of silk: 1.The scrooping vibration is mainly composed of S-S (stick-slip vibration), F-V (free damping vibration) and S-C (characteristical high frequency vibration) vibrations. 2.The scrooping sound of silk mainly depends on F-V and S-S vibrations and belongs to lower frequency sound. The effect of S-C vibration is very small. 3.The wave equation of scrooping sound and the vibration equation of x=x_0=l/2 were established. The following formulas were obtained on the above basis: the slip distance is equal to the stick distance, i.e. s=(T_1/T_2) l (u_s-u_k) cos[(180°-θ)/2] The slip period t_(sl)=(1/n)(ρ/T_2)^(1/2) The mean slip velocity (?)=[nT_1/(ρT_2)^(1/2)](μ_s-μ_k)cos[(180°-θ)/2] The stick period t_(s2)=(T_1l/T_2v_o)( μ_s-μ_k)cos[(180°-θ)/2] The stick-slip period t_(s-s)=t_(sl)+t_(s2) 4. The critical condition producing stick-slip vibration is (u_s-u_k)>0.

关 键 词：丝鸣 粘滑振动 波动方程 粘滑周期 

分 类 号：TS141[轻工技术与工程—纺织材料与纺织品设计]