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

A static compensation and ultra-low frequency technology, applied in vibration testing, measuring devices, testing of machine/structural components, etc., can solve the problems of increasing the stroke of the vibration table, high cost of implementation, and difficult to meet, and achieve the goal of reducing the accuracy of the guide rail Requirement, improvement of compensation effect, effect of obvious compensation effect

Active Publication Date: 2014-05-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 this patent only refers to the direction along the sensitive axis of the sensor to be calibrated, the same below) have the same amplitude, so that The calibration principle of single-axis sinusoidal steady-state excitation is not satisfied, and it also brings difficulties and deviations to signal extraction and processing
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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, two levels are used to measure the pitch angle of the moving part (sliding table) of the vibrating table, and a linear grating ruler is used to measure the real-time displacement of the sliding table as an example. figure 1 and 2 shown.

[0036] The static compensation method for the irregularity of the guide rail of the ultra-low frequency horizontal vibrating table includes the following steps:

[0037] (1) The static performance of the uneven guide rail of the ultra-low frequency horizontal vibration table is measured:

[0038] (1.1) Place the two spirit levels 1 and 2 symmetrically on the slide 4 of the ultra-low frequency vibration table 3, push the slide 4 to move along the guide rail 5, and measure and record the two statically at certain distances within the entire range of motion of the slide 4. The average pitch angle of slide 4 output by levels 1 and 2 θ (Refer to the horizontal direction, the same below);

[0039] (1.2), while perfor...

Embodiment 2

[0055] Embodiment 1 uses a level to detect the pitch angle of the moving part of the vibrating table (sliding table), calculates the resulting gravitational acceleration component, and then calculates the pitch of the sliding table based on the assumption that the influence of the unevenness of the guide rail on the high-frequency vibration calibration can be ignored. to the output signal of the sensor to be calibrated, and this embodiment takes the output signal of the sensor to be calibrated by directly detecting the pitch of the sliding platform by using the sensor to be calibrated with zero frequency response, and using a linear grating ruler to measure the real-time displacement of the sliding platform as an example illustrate.

[0056] The static compensation method for the irregularity of the guide rail of the ultra-low frequency horizontal vibrating table includes the following steps:

[0057] (1) Install the sensor to be calibrated on the sliding table of the ultra-lo...

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Abstract

The invention discloses an unsmooth static compensation method for an ultralow-frequency horizontal vibration table guide rail. The method comprises the following steps: measuring the unsmooth static performance of the ultralow-frequency horizontal vibration table guide rail, wherein unsmooth static performance is represented in a formula I as shown in the specification, and in the formula I, a formula II is represented as an output signal of a displacement sensor, x refers to different positions in which a sliding table is positioned along the vibration direction, Sgra is the sensitivity of the displacement sensor, and theta is an inclination angle of the sliding table at the position x; performing static compensation on the unsmooth ultralow-frequency horizontal vibration table guide rail as a sampling time point, wherein ti serves as a sampling time point, uati serves as the output voltage of the calibrated sensor at the moment ti after compensation, uatti serves as the output voltage of the calibrated sensor before compensation, ugti is output voltage which is superposed on the calibrated sensor due to the unsmooth guide rail and is caused by a gravitational acceleration component, a formula II as shown in the specification is a sampling value of a formula III as shown in the specification at the moment ti, and SaH is a theoretical value of the sensitivity of the calibrated sensor. The method has the advantages that the calibration result deviation caused by the unsmooth guide rail can be corrected, and the precision of ultralow-frequency vibration and calibration is improved.

Description

technical field [0001] The invention relates to a static 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 function...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
Inventor 何闻张旭飞王春宇贾叔仕
Owner ZHEJIANG UNIV
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