A Loading Control Method for Structural Test

Abstract

The invention discloses a loading control method for structural testing. The loading control method comprises the following steps that: step one, a test piece is processed by discretization to generate control points and the control points of the test piece are obtained; step two, loading targets, actuators and sensors of the test piece are allocated to all control points; and step three, outer loop controlling is carried out on each control point until the experiment is completed. According to the invention, the control point concept is put forward. The control point is defined to be a pointcapable of representing the real motion or response of the structure and all loading targets, actuators and displacement meters are allocated to all control points; and a control-point-based test loading control method is established. For each control point, a nonlinear coordinate transformation matrix is calculated according to the coordinates of all actuators and the coordinates of the displacement meters on the control point; and the adaptability to random reasonable actuator arrangement plan and displacement meter arrangement plan is high. A universal loading control process is provided for various test piece types and loading plans that may occur in the actual test.

Description

technical field [0001] The invention relates to civil engineering technology, in particular to a loading control method for structural tests. Background technique [0002] The existing loading control method for structural tests regards the loading targets on all degrees of freedom of the specimen as a whole, and establishes a loading control outer loop to achieve the target. The main process and principle are as follows. Firstly, according to the specific layout scheme of the actuator and sensor in the test, the coordinate transformation relationship between the loading target of the structure and the loading target of the actuator, and the coordinate transformation relationship between the measured value of the sensor and the actual displacement of the structure are determined; then , define two coordinate transformation relationships in the loading control system, and design the outer loop of loading control; finally, start the loading control system and carry out the tes...

AI Technical Summary

Problems solved by technology

[0003] First, its loading control scheme is directly related to the specific layout scheme of actuators and sensors, and for different types of specimens, the layout scheme is usually different, so a single test loading control scheme often cannot be directly used for other tests , not universal;

[0004] Second, this method assumes that the coordinate transformation relationship between the structure loading target and the actuator loading target remains unchanged during the test, while the moving direction of the actuator is constantly changing in the actual test, and a fixed coordinate transformation relationship is adopted It will not be able to reflect the real situation of the test and bring errors to the test results;

Due to the diversity of test schemes, these custom configurations involve many aspects such as force-displacement mixing or switching control, outer loop controller design, etc., which are complicated to implement and also not universal.

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