多弹性支承-轴向运动导纱梳栉的振动模型

Vibration model of elastically-supported axially moving guide bar

针对经编机导纱梳栉由于弯曲振动造成导纱针与舌针摩擦的问题,基于连续梁理论从静态和动态方面建立了导纱梳栉的振动模型。通过能量法获得导纱梳栉的振动方程,通过边界条件和连续性条件获得导纱梳栉的特征方程和模态函数。在静态情况下,研究了不同材料和支承刚度对导纱梳栉固有频率和振型的影响;在动态情况下,研究了轴向速度、加速度和横移时间对导纱梳栉固有频率的影响。研究结果表明,材料和支承刚度对导纱梳栉振动的影响显著,而速度、加速度和横移时间的影响较小。研究结果可为减小导纱梳栉的弯曲振动和优化经编机的横移系统提供参考。

Aiming at the friction problem between guide needle and latch needle caused by the bending vibration of guide bars in a warp knitting machine,the vibration model of the thread guide bar was established from static and dynamic perspectives based on the continuous beam theory.The vibration equation of the guide bar was obtained by energy method,and the characteristics equation and mode function were built based on the boundary conditions and continuity conditions.In the case of static loading,the effects of materials and support stiffness on the frequencies and mode shapes were investigated.When the dynamical loading was considered,the effects of axial velocity,acceleration,and the transverse time on the natural frequencies were evaluated.The study shows that the influences of the materials and support stiffness are significant,while the influences of the velocity,acceleration,and transverse time are small,which provide reference for reducing the bending vibration of guide bar and optimizing the guide bar shogging system in the warp knitting machine.