基于磁流变技术的压桩机吊机回转启动冲击控制

Control of Shock Vibration of Crane Slewing System of Pile Driving Machinery based on Magnetorheological Technology

针对压桩机吊机回转启动冲击载荷损坏设备的现象,提出一种基于磁流变技术的冲击振动控制方法。根据压桩机吊机回转启动工况特点和磁流变联轴器工作原理,运用键合图理论建立回转系统的动力学模型。基于MATLAB仿真平台分析输入电流不同时联轴器的传动特性及其对回转系统启动冲击载荷的抑制规律。研究结果表明:小电流时联轴器刚度系数小,系统响应滞后,大电流时联轴器趋近于刚性连接,系统响应快速;联轴器阻尼系数小,传递能量损耗少,对系统传动效率影响很小;联轴器磁滞效应可有效控制系统压力幅值和脉宽,降低齿轮啮合力冲击峰值,提高系统工作稳定性。

Aiming at the impact loads caused by sudden start of the crane slewing system of pile driving machinery, a method for controlling the shock vibration is put forward based on magnetorheological technology. According to the start working characteristics of the crane slewing system and the working principle of the magnetorheological coupling, the bond graph model of the slewing system is established, and the dynamic mathematic model of rotary transmission process is derived from the bond graph model. The transmission characteristics of the coupling and its effect on slewing system are analyzed based on MATLAB software. The results show that the stiffness coefficient of the coupling is small when the input current is small, which causes the system response to lag;the coupling tends to stiffen the connection when the input current is large, which causes the fast response of the system. When the damping coefficient of coupling is small, its energy dissipation is less, which has little impact on the system transmission efficiency. The magnetic delay effect of the coupling can effectively control the impact load peak value and the pulse width, and increase the service life of the slewing gear.