Controllable loading spectrum hydraulic loading method and loading device therefor

Abstract

The invention relates to a controllable loading spectrum hydraulic loading method and a loading device therefore. The loading device comprises a loading cylinder, which is provided with a first oil chamber and a second oil chamber, with hydraulic fluid ports of the first oil chamber and the second oil chamber being connected to an oil pump and an oil tank respectively through a three-position four-way reversing valve; an accumulator is disposed between the three-position four-way reversing valve and the oil pump; a loading piston rod is provided with a force transducer; and the loading devicealso comprises a microcomputer control system for controlling the reversing of the three-position four-way reversing valve. Signals of the force transducer are output to the control system. The method comprises the steps of inputting the to-be-loaded loading spectrum in the microcomputer control system during the loading, controlling the three-position four-way reversing valve to reverse through the microcomputer control system, for acquiring the required loading on the loading piston rod of a loading piston, detecting the loading on the loading piston rod through the force transducer and transmitting a detection result to a microcomputer loading system for comparison, determining whether the loading on the loading piston rod meets the requirement, and adjusting a working position and reversing time of the three-position four-way reversing valve according to a comparison result.

Description

technical field [0001] The invention relates to a hydraulic loading method capable of adding a controllable load spectrum, and simultaneously the invention also relates to a loading device of the loading method. Background technique [0002] With the development of industrial technology, a loading device with a controllable load spectrum is required in many occasions. For example, when simulating the railway pantograph-catenary system, due to the influence of factors such as the span of the overhead line, the speed of the vehicle, the quality of the overhead line, the structure and characteristics of the pantograph, the pressure of the pantograph on the conductor changes with different laws. Therefore, the loading device of the simulation system is also a loading device with a variable load spectrum, and the magnitude, frequency and waveform of the load loaded by the loading device all change. [0003] The ways to achieve variable load loading include electromagnetic loadin...

AI Technical Summary

Problems solved by technology

Electromagnetic loading method The pulsating load excitation signal is greatly disturbed by the outside world, the loading force is not easy to control, and the loading force is small; the traditional hydraulic method is used to realize pulsating loading, the system response is slow and easy to lag, and it is impossible to achieve medium and high frequency loading; traditional mechanical loading is mostly used Polarization type or transmission type, the frequency and size of the load generated by this type of loading device are not easy to adjust, and the noise is relatively large during use

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