Multi-degree-of-freedom loading method based on parallel mechanism driving force closed loop

Abstract

The invention provides a multi-degree-of-freedom loading method based on parallel mechanism driving force closed loop. The multi-degree-of-freedom loading method comprises the following steps: converting force and moment, which are required to be applied to a tested element, into driving force for loading each actuator of a six-degree-of-freedom parallel mechanism; and then carrying out force closed loop control on each actuator of the parallel mechanism so as to achieve the control on the multi-degree-of-freedom load of the tested element. The loading method also can comprise the steps of carrying out force positive solution operation on the driving force of the parallel mechanism, and resolving the force and moment which are applied to the tested element, thereby achieving accurate multi-degree-of-freedom force loading on the complex stressed tested element by the six-degree-of-freedom parallel mechanism. Thus, under the condition of not using a six-degree-of-freedom sensor, the force and moment on the tested element can be measured; the complicated multi-degree-of-freedom stress and moment of the tested element can be loaded in a static mode or in a dynamic mode; moreover, the loading force and moment, which are applied to the tested element, can be calculated accurately.

Description

technical field [0001] The invention relates to mechanical and hydraulic technology, specifically a multi-degree-of-freedom loading method based on a closed-loop driving force of a parallel mechanism. Background technique [0002] The multi-degree-of-freedom loading test system is an important load simulation and component performance testing equipment. With the rapid development of my country's machinery, aerospace, construction and other industries, various new materials and new structures have been widely researched and applied. The various components in these new materials and new structures usually have more complex stress states , the constitutive relationship obtained by the conventional uniaxial loading test will cause a large analysis error, and in severe cases, it will mislead the scheme selection and structural design, resulting in serious losses. However, limited by the existing test equipment and methods, there is no suitable test equipment for the constitutive ...

AI Technical Summary

Problems solved by technology

With the rapid development of my country's machinery, aerospace, construction and other industries, various new materials and new structures have been widely researched and applied. The various components in these new materials and new structures usually have more complex stress states , the constitutive relationship obtained by the conventional uniaxial loading test will cause a large analysis error, and in serious cases, it will mislead the scheme selection and structural design, causing serious losses

However, limited by the existing test equipment and methods, there is no suitable test equipment for the constitutive relationship test under complex stress conditions, especially for the constitutive relationship test research of large-scale components under complex force conditions. Multi-degree-of-freedom loading test equipment

And for the loading test of large and complex structures, it is necessary to measure the force or moment they are subjected to. The common method is to use a six-degree-of-freedom sensor for measurement, but the six-degree-of-freedom sensor not only has a very limited measurement range, but also is very expensive. At present There is no suitable solution

Images