Multi-dimensional force sensor dynamic experiment device based on stable-state sine exciting force

Abstract

The invention provides a multi-dimensional force sensor dynamic experiment device based on a stable-state sine exciting force, comprising a T-shaped rack and an L-shaped rack, wherein when a force sensor to be detected is fixedly arranged on the an end face of a horizontal plate of a base and is loaded by the T-shaped rack, the loading of the exciting force or an exciting force moment is realized; when the force sensor to be detected is fixedly arranged on the end face of a vertical plate of a base and is loaded by the L-shaped rack, the L-shaped rack is used as a switchover piece of the force sensor to be detected and the T-shaped rack and is used for changing a stressing direction of the force sensor to be detected and realizing different combined types of loading. When a motor is rotated at a certain rotating speed, sine exciting forces with different amplitudes can be obtained through adjusting the position of an adjusting block in a diameter-changing slide groove in an eccentric exciting block, so as to realize an amplitude-frequency property test. In the rotation process of the eccentric exciting block, a permanent magnet steel block periodically stimulates a Hall sensor to output a pulse signal and utilizes a pulse signal triggering moment to determine the maximum value time slot of a component force amplitude of an eccentric force at a certain stressing direction, so as to recover the known sine exciting force signal and realize a phase-frequency property test.

Description

Technical field: [0001] The invention relates to the field of force sensor testing, in particular to a multi-dimensional force sensor dynamic experiment device based on steady-state sinusoidal excitation force. Background technique: [0002] At present, with the rapid development of aviation, aerospace, robotics and other industries, higher requirements are put forward for the comprehensive performance indicators of multi-dimensional force sensors, especially the dynamic characteristics under actual use conditions. Therefore, dynamic calibration and parameter testing of multi-dimensional force sensors have become important. research topics. At present, the dynamic experiment method of multidimensional force sensor is divided into step response method, impulse response method and frequency response method according to the different forms of standard dynamic force source. The step response method and the impulse response method test the dynamic characteristics of the multi-di...

AI Technical Summary

Problems solved by technology

The structure of the test bench is complex and difficult to adjust, especially for multi-dimensional force sensors with small range and small dimensions, it is difficult to ensure the precise loading position, and when two or more electromagnetic force generators work at the same time, it is difficult to ensure that the excitation force is loaded synchronously

[0008] The literature [The results of comparisons between two different dynamic force measurement systems", Measurement, Vol.10, No.3, 1992] proposes an electromagnetic vibrating table for dynamic testing of force sensors, in which a sine wave of a certain frequency is generated by a signal source The periodic signal drives the electromagnetic vibrating table to work. An accelerometer is installed on the load mass to measure the excitation force applied to the force sensor. This device can change the frequency of the output signal of the signal source within a certain frequency range to obtain different frequency points. Sensitivity of the sensor, but it is difficult to realize the dynamic force of large value and wide frequency band, and there are errors in the calculation method

[0009] The above-mentioned force sensor dynamic test devices based on the frequency domain all use a sinusoidal periodic signal of a certain frequency generated by the signal generator to excite the electromagnetic force generator, which is greatly affected by power fluctuations and external environmental interference, and voltage changes cause large changes in the excitation force. , the test accuracy is low

[0010] So far, the frequency response method has been rarely used at home and abroad to carry out dynamic experimental research on multi-dimensional force sensors. The main problem is that the standard force source is difficult to achieve, and there is a lack of corresponding dynamic standard force source devices, that is, to obtain stable amplitude, easy adjustment, and frequency. Continuously varying incentives are difficult, as evidenced by literature search results

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