Study Of Multi-axial Loading And Stiffness-measuring Control System

Stiffness-measuring plays a crucial part in the full development of industrial products,which also affects their potential applications. However, there are some obvious obstacles in well-established measuring methods, such as low loading precision, lacking of detection for the coupled deformation parameters, and poor universality. In this paper, we devised a high precision loading stiffness-measuring device, which is suitable for most mechanical parts or units. It has great potential in engineering domain. Our work is also meaningful for the study of super loading stiffness-measuring equipment.Firstly, the latest development and research on loading stiffness-measuring device have been summarized; we also introduce the basic principles of multi-axial loading and stiffness measurement. We focus on the combination of multi-axial loading and least square method based inductive displacement transducers, offering the coupled deformation parameters, then we finish the design of the mechanical structure of the device.Secondly, we provide a reference for designing electric elemental chart of the loading system. We studied the control process of the close-loop and calibrate the coordinates of the probe, the control of the cameras in close-loop, and the control process of data collection. We also finished the work of hardware selection.Thirdly, base on the structure of hardware, we accomplished the design of the software.There are several modules which is one to one correlation with the hardware. We studied the operating principles and workflow of the functional parts. We further discussed the incremental PID algorithm, the servo reactance feedback data, and the proximity correction of the probe location parameters.At last, we accomplished the assembly of the mechanical structure and control cabinet of the test machine. We tested the performance of the loading unit and had some stiffness-measuring experiments. Based on the results of the relevant experiments, we verified the performances of the loading unit of the test machine, and made a few adjustments in the software part.