变刚度条件下隧道掘进机撑靴液压缸的动态特性

Vibration Performance Analysis for the Gripper Cylinder of Tunnel Boring Machine with Variable Stiffness

全断面岩石隧道掘进机(Tunnel Boring Machine,TBM)的振动将造成其撑靴液压缸损伤,进而影响TBM的掘进.考虑液压缸的结构及其工作过程中的变刚度特性,基于拉格朗日方法建立了TBM撑靴液压缸集中参数动力学模型,分析了活塞杆伸出量、撑靴界面刚度和油液等效刚度等因素对液压缸振动的影响,并分析了TBM工作过程中,撑靴液压缸内部的载荷特性.结果表明:随着活塞杆伸出量的增加,液压缸的固有频率略有下降;随着撑靴界面刚度和导向铜套的等效刚度增加,液压缸的固有频率略有提高;活塞杆密封和油液等效刚度对撑靴液压缸的振动固有频率的影响最明显.通过分析TBM撑靴液压缸的动态特性,可以得到撑靴液压缸的振动载荷规律,为研究液压缸的损伤提供了载荷基础.

The vibration of full face hard rock tunnel boring machine（TBM）can cause the damages of the gripper cylinder that may result in breakdown of the whole system.A lumped-mass parameter dynamic model of the gripper cylinder in TBMs is established based on the Lagrange method,and the variable stiffness behavior of the structures in the cylinder and the working conditions are considered in the model.The dynamic performance and load transmission of the gripper cylinder are numerically discussed with the influence of the piston rod extension,the equivalent stiffness of the rock and seals and the copper guide sleeve.The results show that the natural frequency of the gripper cylinder decreases with the extension length of the piston rod.The natural frequency has the positive correlation with the equivalent stiffness of the rock,the seal,the copper guide sleeve and the oil.The equivalent stiffness of the oil and seals are the most important factor.The characteristics of the vibration load can be achieved in terms of the analysis of the vibration performance of hydraulic cylinder,and may provide the basement of the damage analysis for the hydraulic cylinder.