Friction force and friction coefficient experiment and measurement device and measurement method

Abstract

The invention relates to a friction force and friction coefficient experiment and measurement device and method. A measurement end of the measurement device comprises a friction bearing board, a supersonic wave speed measurement sensor, a motor stop switch, a foundation, a circuit board, a single-chip microcomputer, a resistor strain type sensor, an AD converter, a wireless transceiver module, a DC motor, an LED indication lamp, a pulley and a weighing disc, wherein the resistor strain type sensor I is provided with the weight disc, one end of the resistor strain type sensor is provided with the pulley, an output shaft of the DC motor has a coiling wheel, non-elastic wire is wound through the coiling wheel and is then connected with a detected object, a PID algorithm is utilized by the single-chip microcomputer to adjust PWM driven by the motor to pull the detected object to do uniform motion, and a display control end of the measurement device comprises a single-chip microcomputer, a lithium cell, a liquid crystal display screen, a wireless transceiver module, a button, a buzzer and an LED indication lamp. The measurement device is advantaged in that quick, simple, visual and accurate measurement can be realized, not only can the measurement device be applied to physics experiment teaching, but also the measurement device can be applied to professional friction force and smoothness detection.

Description

technical field [0001] The invention relates to a friction force and friction coefficient measurement device, in particular to a friction force and friction coefficient experiment and measurement device and a measurement method. Background technique [0002] The measurement of friction force has always been a difficult point in the design of physical experiments. The traditional methods for measuring friction force in physical experiments include the inclined plane method and the horizontal method. The slope method is to place the measured object on a platform, and then gradually increase the tilt angle of the platform. When the measured object starts to slide due to gravity, measure the tilt angle, and calculate the friction force and friction coefficient according to the decomposition of the force. . The horizontal method is to place the measured object horizontally on a horizontal platform, apply traction to make the measured object move at a uniform speed, and the tract...

AI Technical Summary

Problems solved by technology

However, there are also deficiencies in horizontal measurement. The most prominent is the provision of traction. The most primitive is manual traction, that is, the movement of the measured object is pulled by hand, but the force provided by the hand is not balanced, and it is difficult to make the object move along the horizontal direction. uniform motion

Later, people also improved the friction measurement device, using heavy objects or electric motors to pull, the traction provided by these two methods is constant, but since we are measuring the magnitude of friction, we cannot predict the traction provided. How much traction should be, which causes traction is not equal to friction, so the final measurement result is also wrong

In addition, in this method, the dynamometer moves with the measured object during measurement, which causes inconvenience in reading, and the accuracy of most dynamometers is not enough, and the error is large

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