Study On Mechanical Quantity Of Sensing And Measurement Technology In Multiple Factors

Mechanical testing is an important research means and components of mechanical discipline. The final goal is to obtain and extract information which can reflect the nature of the test subject or phenomenon. The extration of mechanical phenomenon nature is a process from complex mechanical environment. The success of the mechanical test depends on the means and methods of mechanical information, the characterization of mechanical information, the analysis and application of mechanical information and human factors during the test.With the rapid develoment of socio-economic and scientific technology, on the one hand, the areas and complexity of mechanical tests are increasing rapidly. On the other hand, the research and engineering requires much more accuracy and reliability of experiment. There are many issues to be resolved such as improvement the precision of the expriment and the testing methods. And effectively reduce and eliminate errors from the entire testing process. It is a very scientific and pratical study including complex mechanical quantity sensing and testing, uncertainty of measurement controling and effective information application.In this paper, the research follows the integrated error control and information extraction and application of mechanical testing. The paper researches deep into the precision of the deformation test methods; the design of special torsion/tension load cell; constitutive experimental and mechanical quantity testing of biomechanics; mechanical quantities feature recognition and so on. The detailed work and outcomes are as following:â‘ It discussed the two most important measured quantities of mechanical testing techniques: force and deformation. And a deep analysis carried out for the most common strain of a deformation sensor in the standard test - electronic extensometer, particularly in the choice of materials and the design of structure. In order to eliminate the impact of the eccentric tensile, a two-side high-precision electronic extensometer was designed. At the same time, the impact of upper and lower clamp's offset to deformation was systematic studied by using theoretical analysis and finite element method in the metal standard tensile test. The reversal phenomenon of electronic extensometer was analyzed and verified.â‘¡A load cell with large ratio of tensile traction to torque is developed for biaxial tension-torsion test of thin-walled microtubes, which is based on the separation of tensile / bending deformation of 4 symmetrically distributed thin strips, on each of which there is a hole in the middle. It solve a lot of problems in this particular application, and meet the need of test requirements. It provides a valuable example for similar sensor design of low-torque / high-tensile.â‘¢The biological soft tissue is delamination and multi-bundle fasciculi, high water content, easily damaged by conventional clamping. Aiming at the problems of bio-mechanics constitutive experiment, a freezing clamp was designed for the biological soft tissue. Combining the anterior cruciate ligament tension measurement experiment, a mixed numerical-experimental method for identify the constitutive parameters was carried out. A good result was achieved in parameters acquisition and correction.â‘£A new mechanical characteristics recognition method of biological feature was designed. It uses the keystroke actions, combined with the sense of keystroke mechanical characteristics, data acquisition and features storage. The time-varying characteristics of the signal intensity were analyzed by morphological characteristics curve analysis method. The identification between different people and different states of keystroke behavior was put in practice.