Follow-up passive servo loading device and load obtaining method

Abstract

The invention relates to a follow-up passive servo loading device and a load obtaining method. The device comprises a loaded object sliding rail and a substrate, wherein the loaded object sliding rail is fixedly installed on the substrate, and a loaded object is installed on the loaded object sliding rail, and can slide on the loaded object sliding rail. The loaded object makes contact with a follow-up mechanism which is used for obtaining the displacement and moves along with the loaded object synchronously. The follow-up mechanism is connected with a pressure output mechanism which is used for obtaining the size of a loading force. According to the invention, the follow-up mechanism makes close contact with the loaded object, and obtains the displacement of the loaded object. The follow-up mechanism is used for driving the pressure output mechanism to move, and obtains the size of the loading force through the pressure output mechanism. The device collects the pressure timely and accurately, is sensitive to the displacement of the loaded object, and is also sensitive to a load. The response frequency of the system is far greater than the movement frequency of the loaded object, and can improve the timeliness and accuracy of system response.

Description

technical field [0001] The invention belongs to the technical field of test platforms, and in particular relates to a follow-up passive servo loading device and a load acquisition method. Background technique [0002] With the society's increasing demand for large-scale high-precision equipment, the demand for parts loading test benches also increases, and the requirements for the timeliness and accuracy of obtaining loads are also increasing. The traditional passive loading test bench uses a hydraulic cylinder with a flow valve. The main problem with this loading system is that it can only be applied to the state of the loaded object with small stiffness. [0003] F=kx [0004] For the state of the loaded object with small stiffness, k is a finite value, and when F is constant, then x can be precisely controlled. [0005] For the state of the loaded object with large stiffness, k is infinite, and when F is constant, x is very small and cannot be precisely controlled. [...

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Problems solved by technology

[0005] For the state of the loaded object with large stiffness, k is infinite, and when F is constant, x is very small and cannot be precisely controlled

[0006] The performance of the pressure valve itself is only related to the size of the hydraulic cylinder cavity, and its response bandwidth is much smaller than the corresponding bandwidth of the flow valve, which cannot meet the requirements when the motion frequency of the loaded object is high.

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