Calibration device and method of cable force measuring instrument

Abstract

A calibration device and method of a cable force measuring instrument belong to the field of vibration frequency calibration of stay ropes. A present calibration method of the cable force measuring instrument via a standard vibration table cannot obtain the vibration frequency of the standard vibration table in the low frequency range due to the fact that a standard vibration sensor of the standard vibration table is extremely low in the measuring capability in the low frequency range of 0.3 to 10Hz, a practical calibration result has a large error, and according to existing literatures, the uncertainty of the present standard vibration table in measuring the low frequency of the cable force measuring instrument is not lower than 10%. An introduced uncertainty component is composed of a waveform disc processing precision and separation time of a waveform disc and a contact rod. A negative feedback structure composed of a boundary rotator, a boundary block, a boundary block carriage, arod table joint, the contact rod, a displacement record module, a main controller and a contact determiner can reduce the separation time to less than 0.08 second, and the uncertainty of the calibration device can be reduced to 2.5%.

Description

technical field [0001] The invention belongs to the field of calibrating the vibration frequency measurement capability of a cable force dynamic measuring instrument. Background technique [0002] With the rapid development of my country's economic construction and opening to the outside world, the continuous progress of bridge technology and people's requirements for bridge aesthetics, cable technology is increasingly widely used in long-span bridges. Typical applications include main cables and suspension cables of suspension bridges, inclined cables of cable-stayed bridges, suspension cables of arch suspension bridges, etc. As the core component of the above-mentioned large-scale bridge structure, most of the weight of the bridge span structure and the live load on the bridge are transmitted to the tower column through the cables. According to incomplete statistics, there are more than 300 long-span cable-type bridges in my country, and most of the cables have various de...

AI Technical Summary

Problems solved by technology

[0009] 1) The standard shaking table system is expensive. Taking the LF-01 standard shaking table produced by the China Institute of Metrology and the Institute of Engineering Mechanics of the China Earthquake Administration as an example, the total price needs to be at least one million yuan

[0010] 2) Poor low frequency vibration capability

The quality of the motion signal generated by the current standard shaking table in the low frequency range is not good. Generally, it can only generate a vibration frequency above 10Hz, while the vibration frequency of the long cable is generally lower. The standard shaking table method cannot meet the calibration needs of low frequency vibration measurement.

[0011] 3) The standard shaking table method needs to be equipped with a standard sensor to obtain the standard vibration frequency value. The frequency response range of the required standard sensor generally needs to cover 0.1Hz-200Hz. The sensor with this technical index is difficult to equip and has low accuracy.

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