盾构掘进机推进速度控制性能分析

Analysis of Speed Control Performance for Thrust System in Shield Tunneling Machine

在分析基于压力和速度复合控制原理的盾构掘进机推进液压系统基础上,以推进系统分区控制中的单组推进液压缸为控制对象,建立了速度控制的数学模型,并进行了相应的动态特性分析,进一步分析了液压油液体积弹性模量、系统总泄漏以及土质特性等内部和外部不确定因素对控制性能的影响。在模拟实验台上完成了模拟地面10m以下不同地质状况中的掘进实验。结果表明,采用比例调速阀和比例溢流阀分别构成推进速度和压力闭环控制的盾构掘进机推进系统能够消除推进遇到的各种不确定因素的影响,较好地完成不同地质条件下的掘进控制任务。

A thrust hydraulic system adopted in shield tunneling machine was described based on the compound control of advance speed and thrust pressure. Took one group control of the thrust system controlled in groups in practice as an example, the theoretical modeling for speed control as well as the relevant dynamic simulations was conducted respectively. The influence of the uncertain internal and external factors such as effective bulk modulus of hydraulic oil, leakage flow and soil characteristics on the performances of the control systems was investigated. The excavating experiment was carded out on a shield simulation test rig to simulate the excavation in clay and sandy soils with an overburden depth of 10m. The experimental results show that the thrust system can achieve good control performance even in different geological conditions, by means of the proportional flow and pressure control valves making up the speed and pressure closed loop control systems separately.