Stress relaxation performance is an important performance indicator for evaluating elastic materials or components. The accuracy of relaxation testing machines directly determines the accuracy of the detection results of relaxation tests, which affects the effectiveness and reliability of the detection results. For a long time, the calibration work of the relaxation testing machine has not been carried out, and the testing and testing institutions cannot grasp the accuracy of the relaxation testing machine equipment itself. To achieve the calibration of the relaxation test force value system, the requirements for calibration parameters were clarified, and a calibration test for the relative error of force value indication was designed, and its uncertainty was evaluated.
In statistics, the evaluation of measurement uncertainty is used as the technical carrier for the quality evaluation of measurement results of automatic testing equipment. In this paper, the uncertainty of the measurement results of the automatic testing system of Twin-wheel side force coefficient, which is an important testing equipment for pavement lateral force coefficient, is evaluated according to the testing methods specified in the Chinese transportation industry standards. The sources of uncertainty are analyzed, and the calculation steps of uncertainty combination are simplified. The purpose of this paper is to solve the scientific problems such as insufficient basic data and heavy calculation encountered by engineering inspectors in the evaluation of uncertainty, and to provide support for the evaluation of road traffic engineering inspection quality.
KEYWORDS: Cements, Calibration, Error analysis, Standards development, Resistance, Time metrology, Testing and analysis, Reliability, Control systems, Analytical research
Carry out research on calibration technology for cement mortar strength flexural and compressive testing machine. On the basis of clarifying the test force as the main calibration parameter, the measurement performance requirements of the relevant parameters are put forward, the calibration method is designed, the measurement standard instrument is developed, and the uncertainty evaluation method is formed. The research results lay a foundation for the calibration of the test force of the cement mortar strength flexural and compression testing machine and improve the reliability of the cement mortar strength test results.
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