大模数齿轮齿条起升机构模拟试验台动力学研究

Dynamics research on simulation test bed of large-module pinion and rack lifting mechanism

大模数齿轮齿条驱动式起升工作平台属于典型低速重载装备,其模数往往超过了模数系列中所规定的标准值,这不仅对现有的设计理论、制造工艺及安装方法提出了新挑战,而且对其安全高效运行和可靠性保障提出了新要求。为了研究齿轮齿条传动副在复杂工况条件下的失效机理和动力学响应特性,揭示设备服役性能退化和可靠性演化规律,以三峡升船机为对象,搭建了一个立式齿轮齿条起升机构传动系统工况模拟试验台,利用三维软件对齿轮齿条传动副进行实体建模,利用有限元方法对其进行静力学强度分析,研究齿轮和齿条应力应变分布规律。以齿轮齿条起升机构的三维建模为基础,对不同工况下的齿轮齿条起升机构的啮合运动进行动力学响应特性分析,得到齿轮齿条啮合传动过程中的速度、加速度和接触力相互耦合作用及运动规律,采用以小推大的思想,为大模数齿轮齿条起升的故障诊断和运行健康评估提供必要的理论和实验依据。

The large-module pinion and rack driven lifting platform is a typical low-speed heavy-duty equipment,and its module often exceeds the standard value stipulated in the module series,which not only poses new challenges to the existing design theory,manufacturing process and installation method,but also puts forward new requirements for its safe and efficient operation and reliability guarantee.In order to study failure mechanism and dynamic response characteristics of the pinion and rack transmission under complex conditions,illustrate the evolvement equipment service performance degradation and reliability,focusing on the subject of three gorges ship lift,a vertical pinion and rack lifting mechanism transmission system operating mode simulation test bed,was built using 3D software for pinion and rack driving pair of entity modeling,using finite element method for static strength analysis of the pinion and rack and the distribution regularity of stress and strain.With pinion and rack lifting mechanism based on 3D modeling,analysis of dynamic response characteristics under different working conditions of the meshing of pinion and rack lifting mechanism motion was carried out,pinion and rack transmission speed,acceleration and contact force in the process of mutual coupling effect and the motion law were obtained,the idea of"small push big"for the fault diagnosis of large modulus pinion and rack hoisting and run the health assessment provides the necessary theoretical and experimental basis.