Linear continuous static force loading control method

Abstract

The invention discloses a linear continuous static force loading control method for a nonlinear integration element-free hydraulic loading system. The linear continuous static force loading control method comprises a precise linear continuous static force loading control method, a method of improving the linearity of the static force loading process and a method of achieving continuous loading inthe static force loading process. The linear continuous static force loading control method provided by the invention meets the precise linear continuous static force loading demand of an active pressure storing function free hydraulic device of a small high pressure hydraulic cavity and also meets the precise linear continuous static force loading demands of other nonlinear or integration element-free hydraulic devices. The linear continuous static force loading control method primarily aims to solve the problem that the static force cannot be precisely and linearly loaded in a load open-loop control process by taking a load as a control quantity and a proportional overflow valve as an executing element and solves the problem that the static force cannot be loaded continuously as a result of load value oscillation in an existing load closed ring control process taking the load as a control quantity, a proportional overflow valve as an executing element and a real-time load as a feedback quantity.

Description

technical field [0001] The invention relates to the technical field of control algorithms, in particular to a linear continuous static loading control method. Background technique [0002] During the research process of some materials, its static strength level needs to be evaluated. Therefore, it is necessary to study a scientific research test instrument for material strength testing. [0003] The hydraulic press is the most commonly used device to provide large tonnage, precision, high inertia, continuous type, and strong stability. It is a common loading and driving method for safe, large tonnage, and ultra-precision static loading devices. Compared with the hydraulic press used in material forming, the hydraulic loading system of static simulation equipment used in scientific research and testing instruments generally requires the characteristics of precise performance, simple function, and compact size. [0004] A static loading simulation device currently developed f...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings in the above-mentioned background technology, and provide a linear continuous static loading control method, which is suitable for the precise linear continuous static loading requirements of hydraulic devices with no active pressure accumulation function in small high-pressure hydraulic chambers, and is also applicable to other The requirement for accurate linear continuous static loading of nonlinear or non-integral link hydraulic devices is mainly to solve the problem of inaccurate linear static loading in the existing load open-loop control process with the load as the control variable and the proportional relief valve as the actuator. Loading problem, and to solve the problem that the load value can not be continuously loaded due to the fluctuation of the load value in the current load closed-loop control process with the load as the control amount, the proportional relief valve as the actuator, and the real-time load as the feedback amount. The linear, non-integral link hydraulic loading system requires accurate linear continuous static loading control of the load, including: the overall method of accurate linear continuous static loading control, the method of improving the linearity of the loading process and the realization of continuous static loading during the loading process. Methods

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