Dynamic calibration method for linearity of collision force measurement force sensor

Abstract

The invention discloses a dynamic calibration method for the linearity of a collision force measurement force sensor. The implementation method comprises the steps that the head installation positionof the variable-mass trolley is adjusted till the collision face is perpendicular to the ground; fixing a standard sensor and a sensor to be calibrated on the iron plough plate embedded in the collision wall in a back-to-back manner, so that the collision bearing surface is parallel to the collision surface of the trolley, and the centers of the collision bearing surface and the collision surfacecoincide; installing the end head with the buffer pad on the sensor to be calibrated; setting a collision mass and collision speed range to form m groups of test working conditions with unchanged collision mass and speed from small to large; the trolley is connected with the traction system to realize the set test, and output signals of the two sensors are synchronously acquired; fitting data in astraight line; calculating a nonlinear deviation maximum value under a certain collision mass according to the fitting equation, and calculating the linearity of the sensor under the collision mass according to the nonlinear deviation maximum value; changing the collision mass, repeating the above steps, and obtaining the linearity and linearity relation under different collision masses, therebyrealizing the dynamic calibration.

Description

technical field [0001] The invention relates to a dynamic calibration method for the linearity of a force sensor used for collision force measurement, and belongs to the field of force sensor calibration methods. Background technique [0002] Linearity, also known as nonlinearity, characterizes the degree of deviation between the sensor output-input calibration curve (or average calibration curve) and the selected fitting straight line as the working straight line. This index is usually expressed as a relative error: [0003] [0004] In formula (4): ξ L is linearity; ΔL max is the maximum deviation between the output average calibration curve and the fitted straight line; [0005] the y F.S is the theoretical full-scale output. [0006] The calibration methods currently used for the linearity of force sensors can be divided into three categories: step type, pulse type, and sinusoidal type according to the different excitation forms of the dynamic force generating dev...

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Problems solved by technology

[0006] The calibration methods currently used for the linearity of force sensors can be divided into three categories: step type, pulse type, and sinusoidal type according to the different excitation forms of the dynamic force generating devices. However, if these dynamic force generating devices are used to measure the collision force There are many deficiencies in the calibration of force sensors, such as the accuracy of the sinusoidal force generated by the vibrating table-type sine force source is not high enough, and the force value is not large enough; the step-type force source has the problem of non-standard amplitude sensitivity calibration method; the pulse-type force source cannot guarantee The force condition of the equipment under high-speed impact is consistent with the normal situation, which is easy to cause large errors. At present, there is no complete force sensor calibration / calibration system for measuring collision force in China. This is mainly because it affects the force sensor for measuring collision force. There are many factors for calibration / calibration, especially the loading conditions of the collision force, the installation environment of the sensor, the structural parameters of the equipment, etc.; with the development of traffic safety technology, the detection content of the anti-destruction ability of the equipment has been born, which needs to detect the anti-collision structure Correspondingly, the resistance under destructive collision conditions requires a collision force measurement system and a dynamic calibration method for force sensors that meet the requirements of the collision force loading conditions, equipment installation environment, and equipment structural parameters. The dynamic calibration of the linearity of the force sensor for collision force measurement, the calibration result obtained is closer to the actual working state of the force sensor

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