喷气织机打纬机构及墙板的振动特性

针对喷气织机四连杆打纬机构随着转速的不断提高会引起的强烈振动和噪音问题，采用理论分析、数值模拟和实验相结合的方法对打纬机构及墙板的振动特性进行研究。分析四连杆打纬机构的动力学特性，基于有限元法分析四连杆打纬力对织机墙板振动的影响，建立打纬机构的曲柄旋转角度与打纬力、织机墙板最大振动应力和加速度的关系，确定织机墙板上最大振动以及最大应力产生的位置。结果表明，墙板发生共振的频率约为44?5 Hz，与喷气织机主振频率非常接近，墙板的最大振动主要集中在打纬机构附近，而最大应力主要集中在墙板中部和下部，并非墙板的最大振动处。

Vibration characteristics of wallboard and four-bar linkage beating-up mechanism of air-jet loom

For four?bar linkage beating?up mechanism of the air?jet loom, strong vibrations and noise will be caused by the increased speed. In this paper, the vibration characteristics of beating?up mechanism and wallboard were analyzed by theoretical analysis, numerical simulation and experiments. Firstly, the dynamic characteristics of the four?bar linkage beating?up mechanism were analyzed. And the influence of the four?bar linkage beating?up mechanism on the vibration of the loom wallboard was analyzed based on the finite element method. Through analysis, the relationship of the crank angle of rotation and the forces of beating?up mechanism, the maximum vibration stress and acceleration of loom wallboard were established. Lastly, the location of the maximum vibration and the maximum stress were determined. The results show that the resonance frequency of the wallboard is about 44?5 Hz, which is very close to the main vibration frequency of the air jet loom. The maximum vibration of the loom wallboard is mainly concentrated near the beating?up mechanism. However, the maximum stress is mainly concentrated near the middle and lower part of the loom wallboard instead of the largest vibration of the loom wallboard.