Steel plate spring stiffness and arc height measuring system and measurement compensation method

Abstract

The invention discloses a measurement system of stiffness and camber of a steel plate spring, and a compensating measurement method thereof. The system is characterized by comprising a horizontal reference table which is supported with a measured steel plate spring by pulleys positioned at the two ends; a compression bar which is positioned above the measured steel plate spring and at the central position of the measured steel plate spring, is vertically arranged and can move upwards and downwards, wherein, the bottom part of the compression bar can exert pressure on the measured steel plate spring by a pressure head; a pressure transducer which is used for measuring the pressure that is exerted by the compression bar on the measured steel plate spring by virtue of the pressure head; and a displacement transducer which is used for measuring the displacement of the pressure head in relation to the reference table. In the method and the system, the camber measurement error is compensated according to the linear relation between the elastic deformation and the pressure of the steel plate spring. A threshold pressure is preset so as to effectively reduce self zero output error and external interference errors of the transducer, and the errors resulting from the dead weight of a guide bar, the pressure head, the pressure transducer and the like.

Description

technical field [0001] The invention relates to the measurement of the stiffness and arc height of leaf springs, and more specifically relates to a measurement system and a measurement compensation method for measuring the stiffness and arc height of automobile leaf springs. Background technique [0002] The automobile leaf spring is one of the main components of the automobile, which elastically connects the frame and the axle, and its main function is to transmit all forces and moments between the wheels and the frame, and to ease the impact load transmitted to the frame from uneven roads , to ensure that the car runs smoothly and normally. Leaf springs need high yield strength and fatigue strength because they are subject to large stress and impact loads, and the stiffness and zero-load arc height of leaf springs are important parameters to measure yield strength and fatigue strength, so accurate measurement of leaf springs Stiffness and arc height become extremely impor...

AI Technical Summary

Problems solved by technology

[0004] 1. The load borne by the automobile leaf spring is very large, so the selected pressure sensor has a relatively large range. The large sensor range leads to low sensitivity of the sensor, especially when it acts on a small leaf spring. When the small leaf spring has obvious deformation, while the sensor may have no output

In addition, each sensor has its own zero output error, which leads to a random jump in the deformation of the leaf spring in the actual measurement. External disturbances such as temperature and electromagnetics during the test also have a certain impact on the accuracy of the arc height measurement.

[0005] 2. The sensor, the indenter, the guide rod of the indenter and other auxiliary devices will exert a certain load on the leaf spring due to their own weight. However, the sensor adjusts the gap when the indenter and the leaf spring are just in contact. cause the sensor to be unable to eliminate the gravity and gap

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