Stepper motor based feedback-control vibrating table

Abstract

The invention discloses a stepper motor based feedback-control vibrating table. The vibrating table comprises a vibrating table body and a controller, wherein the vibrating table body consists of a stepper motor, a shaft coupling, a fixed guide rail, a vibrating table top, an orthogonal decoder and a base, and a control system consists of a single-chip microcomputer and a demodulator. According to the vibrating table, the stepper motor is adopted to carry out driving, and the control system adopts feedback-control regulation, so that the problems of the existing vibrating tables that the size is large, the initialized calibration is complicated, the upgrading cost is high, and the like are overcome.

Description

technical field [0001] The invention belongs to the technical field of vibration testing, and in particular relates to a feedback control vibration table based on a stepping motor, which is suitable for vibration detection and testing in vibration detection and instrument calibration. Background technique [0002] In the field of vibration detection and instrument calibration, a vibration table is often required as a vibration source for vibration testing or instrument calibration. For example, in some vibration tests, it is necessary to use a shaking table to generate a specified vibration signal, such as a seismic wave signal, to determine the response of the test object under the excitation, and then determine the parameters of the test object. The vibration table is also often used in instrument calibration. For example, when the vibration pickup is calibrated, the vibration table generates a vibration excitation signal and inputs it to the sensor of the vibration pickup...

AI Technical Summary

Problems solved by technology

[0003] 1. The volume is large. Due to the complex structure and high manufacturing precision requirements of the air-floating guide rail, the projected area of ​​the instrument is large and the space occupied is too large;

[0004] 2. The initial calibration of the instrument is cumbersome. Under the action of the uneven air-floating guide rail, the amplitude-frequency curve of the acceleration sensor will deviate from the theoretical flat line. Along the direction of frequency reduction, there will be upturning or downturning, which will seriously reduce the vibration calibration accuracy. It is necessary to measure the smoothness of the guide rail with a linear grating ruler before use, and compensate for the influence caused by the unevenness of the guide rail;

[0005] 3. The cost of maintenance and use is high. Air-floating guide rails use air as the lubricating medium. Due to the compressibility of air, compared with guide rails with other media, its bearing capacity, pressure distribution, and motion damping are more easily affected by internal and external factors. Therefore, air The floating rail vibration table has high requirements for storage, use environment and performance maintenance;

[0006] 4. The cost of function upgrade is high, and the vibration table of the air-floating guide rail is limited by the structure. The vibration accuracy in the medium and high frequency range of 100-500Hz is high, while the vibration accuracy in the low-frequency range is greatly reduced; if low-frequency vibration is to be realized, the structure and vibration of the air-floating guide rail need to be changed method, that is, the hardware needs to be replaced accordingly

[0007] The existence of the above problems has greatly restricted the utilization rate and application range of the vibration table. With the popularization of vibration detection technology, the demand for vibration detection instruments with strong applicability, low use and maintenance costs, easy upgrade and operation is increasing.

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