纱线束横向动态振动特性仿真与实验

纱线束振动噪声是簇绒地毯织机噪声源之一，为了识别纱线束振动噪声信号，实现地毯生产空间的噪声控制，研究了簇绒地毯织机纱线束横向动态振动特性。应用Burger四元件本构模型建立粘弹性纱线束轴向运动的横向振动方程。采用Galerkin方法离散横向振动偏微分方程，然后使用Runge-Kutta法对该方程数值求解。设置不同的提花轮转速，分别求解振动方程得到不同的纱线束横向振动频率。设置与仿真求解相同的条件下，采用激光测振仪测试纱线束横向振动特性。测试结果显示仿真结果和实验结果存在倍频关系且频率较低。结果表明：该振动方程适用于研究纱线束横向动态振动特性，且仿真信号为纱线束振动的基频信号；同时，纱线束横向动态振动特性属于低频振动。

Simulation and experiment on transverse dynamic vibration characteristics of yarn bundle

Yarn bundle vibration noise is one of the noise sources of tufted carpet loom. In order to identify the noise of the yarn bundle and realize the noise control of the carpet production environment, the transverse dynamic vibration characteristics of the yarn bundle of carpet loom were studied. Burger four-element constitutive model was applied to establish transverse vibration equation of axial motion of viscoelastic yarn bundle.Galerkin method was used to discretize the partial differential equations of lateral vibration, and then the Runge-Kutta method was used to solve this equation numerically. By setting different jacquard wheel speeds, respectively, the vibration equation was solved toacquir different transverse vibration frequency of yarn bundle. Under the same conditions as the simulation solution, the transverse vibration characteristics of the yarn bundle were measured by laser vibration meter. The simulation results are matched with the experimental ones in frequency multiplication while the latter is low. The results show that the vibration equation is suitable for studying the transverse dynamic vibration characteristics of the yarn bundle, and the simulation signal is the fundamental frequency signal of the yarn bundle vibration. At the same time, the transverse dynamic vibration characteristics of the yarn bundle are low frequency vibration.