Unsmooth dynamic compensation method for ultralow-frequency horizontal vibration table guide rail

Abstract

The invention discloses an unsmooth dynamic compensation method for an ultralow-frequency horizontal vibration table guide rail. The unsmooth dynamic compensation method comprises the following steps: measuring unsmooth dynamic characteristics of the ultralow-frequency horizontal vibration table guide rail and output uori t of a calibrated acceleration sensor in real time by taking a horizontal direction as reference; constructing a guide rail unsmoothness dynamic compensation system, and removing a gravitational acceleration component in the output of the calibrated sensor generated by pitching of a sliding table from the original output of the calibrated sensor in real time in the vibration calibration process; calibrating a calibrated acceleration sensor by adopting the compensated output ucomt of the calibrated sensor, calculating to obtain a compensated amplitude-frequency curve, and finishing vibration calibration of the calibrated sensor. The unsmooth dynamic compensation method has the advantages that the calibration result deviation of the acceleration sensor with zero frequency response caused by guide rail unsmoothness based on the ultralow-frequency horizontal vibration table can be compensated in real time in the vibration calibration process, so that the precision of ultralow-frequency vibration calibration is improved.

Description

technical field [0001] The invention relates to a dynamic compensation method for the irregularity of the guide rail of an ultra-low frequency horizontal vibrating table. technical background [0002] With the continuous development of science and technology, the problem of ultra-low frequency vibration traceability needs to be solved urgently. For example, the measurement lower limit of various vibration sensors widely used in aerospace, building monitoring, earthquake prediction, resource exploration and other fields is mostly lower than 0.1Hz, or even As low as zero frequency, accurate calibration of the relevant characteristics of these ultra-low frequency vibration sensors is a prerequisite for their correct application. Therefore, people's demand for ultra-low frequency vibration calibration systems is becoming more and more urgent. [0003] The ultra-low-frequency vibration table is an important part of the ultra-low-frequency vibration calibration system. Its functio...

AI Technical Summary

Problems solved by technology

Under ultra-low frequency conditions, the sinusoidal vibration acceleration component applied horizontally to the vibrating table and the gravitational acceleration component generated by the pitching of the moving parts (in the present invention only refers to the direction along the sensitive axis of the sensor to be calibrated, the same below) have similar amplitudes, so that The calibration principle of single-axis sinusoidal steady-state excitation is not satisfied, and it also brings difficulties and deviations to the extraction and processing of signals

It is easy to ensure the straightness of the guide rail within the range of motion travel; but under ultra-low frequency conditions, in order to improve the signal-to-noise ratio of the output vibration signal, the stroke of the vibration table is often increased (even At this time, due to the limitation of processing, installation and other technological levels, this requirement will be difficult to meet, or the implementation cost will be high, which will seriously affect the accuracy of ultra-low frequency vibration calibration, and even the ultra-low frequency based on the vibration table. Affects the feasibility of vibration calibration

Images