Oscillating method for monitoring the technical condition of the hydraulic cylinders of manipulator machines

Abstract

Abstract The substantiation of the oscillatory method for monitoring the technical condition of the hydraulic cylinders of manipulator-type machines is presented on the example of the boom hydraulic cylinder of a John Deere 1470 forest machine. The results of numerical simulation of dynamic processes in pressure cavities of hydraulic cylinders of manipulator-type machines are described on the basis of a developed mathematical model based on the method of theoretical description of the hydraulic drive structural components using hydromechanical circuits. The hydraulic system of the hydraulic drive boom was adopted as the calculated one. For the formation of dynamic processes in the pressure cavity of the hydraulic cylinder of the boom drive of the described machine, a shut-off valve installed in the drain line is used. This valve made it possible to provide an almost instantaneous stop of the piston, resulting in a hydraulic shock. The calculations also used the method of forming a hydraulic shock with an almost instantaneous stop of the piston at the end of its stroke. The research allowed us to justify the most informative parameter for monitoring the current technical condition of hydraulic cylinders in the functional mode-the logarithmic decrement of damped oscillations, as well as to develop a new hydro-shock method for monitoring the technical condition of hydraulic cylinders.