丝鸣中粘滑振动的理论分析

本文对丝鸣的粘滑振动进行了理论分析,建立了丝鸣波动方程和粘滑振动方程,并由此确认:1.粘滑周期可由所导出的理论方程予以预测,其实验值和理论值基本吻合.2.其滑动周期、滑动位移与弦长成正比,平均滑动速度与弦长无关,而粘附周期则与驱动速度成反比.3.产生粘滑运动的临界条件应该是μ_1-μ_k>0.     

聚酯仿真丝纤维的丝鸣化处理及其工艺

对聚酯仿真丝纤维的丝鸣化处理进行了探讨,取得以下结果:(1)制备了具有较好发声效果的聚酯纤维丝鸣处理液;(2)制订了相应的工艺措施以提高丝鸣处理效果的耐水洗性能;(3)在同样的处理条件下,模量较低、纤度较小的异形CDPET纤维(阳离子可染聚酯纤维)具有较好的发声效果.     

丝鸣的特征和机理

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。     

THE SCROOPING TREATMENT OF POLYESTER SILKLIKE FIBERS

In this paper the mechanism producing scrooping sound has been discussedtheoretically.It has been recognized that the continuous stick-slip vibrationhaving a certain period and the bigger △E(△E——enery released by stick-slipvibration at one time)are the requisite and surfficient conditions producingscrooping sound.For fiber sample,its surface properties and internal structureare two principal factors influencing scrooping sound. Considering the surface properties of polyester fiber after scrooping treatmentare the synthetic reflection of the properties used treatment reagents and thesurface properties of the fiber,how selecting proper reagents for scroopingtreatment would be the key factor influencing the scrooping effect.Sometreatment solutions having better scrooping effect have been obtained in the paper. In order to cause better scrooping effect,not only the treatment reagent andsurface properties of the fiber,but also the internal structure of the fiber must beconsidered,It has been shown in prac     

Characteristics and Mechanism of Scrooping Sound of Silk

In this study a measurement instrument of scrooping sound has been develope.Thefollowing results were obtained by means of measurement and analysis for the frequencyspetrums 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( characteristic high frequency vibration) vibrations. 2 The scrooping sound of silk mainly depends on F- V and S- S vibrations and be-longs to lower frequency sound,while the effect of S- C vibration is limited. 3 The wave and the vibration equations as well as some fromulas of relative physicalproperties have been established on the discussion about the stick- slip vibration. 4 The critical condition producing stick- slip vibration is( μs- μd)> 0.