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An Accurate Algorithm for Measuring Cable Force by Frequency Method

A frequency method and precise technology, applied in the direction of measuring devices, force/torque/work measuring instruments, instruments, etc., can solve the problems that affect the accurate calculation of axial tension, the bending stiffness is not easy to accurately determine, and there is no calculation of axial tension of cable members Methods and other issues, to achieve the effect of convenient and practical measurement of cable force, satisfactory accuracy, and improvement of calculation accuracy

Active Publication Date: 2018-06-29
SHANGHAI TONGJI CONSTR QUALITY INSPECTION STATION
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Problems solved by technology

Therefore, the bending stiffness of the cable member is a quantity that is not easy to be accurately determined, which will affect the accurate calculation of the axial tension
[0004] At present, there is no simple, convenient and accurate method for calculating the axial tension of cable members

Method used

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  • An Accurate Algorithm for Measuring Cable Force by Frequency Method
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  • An Accurate Algorithm for Measuring Cable Force by Frequency Method

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Embodiment Construction

[0030] In order to better clearly express the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0031] figure 1 According to a specific embodiment of the present invention, a schematic flow chart of an accurate algorithm for measuring cable force by frequency method is shown. Those skilled in the art understand that the calculation method is based on the well-known cable vibration mechanism in the field of engineering mechanics, and adopts clever calculation ideas. An effect of avoiding the uncertainty of the bending stiffness and accurately calculating the cable force is achieved. Specifically, in such an embodiment, the following steps are mainly included:

[0032] First, execute step S101 to acquire the vibration signal of the cable. Further, the acquisition of the vibration signal can use a set of detection devices, and the detection device is fixed on the cable to be tested i...

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Abstract

The present invention provides an accurate algorithm for measuring cable force by frequency method, comprising the following steps: obtaining the vibration signal of the cable; analyzing the signal to obtain the vibration frequencies f1, f2, ..., fn of the first n orders; determining the cable force The first relational function between the nth-order vibration frequency fn and the nth-order frequency fcn when only considering the geometric stiffness and the n-th-order frequency fbn when only considering the bending stiffness; determine the nth-order vibration frequency based on the first relationship function The second relational function between fn and the first-order frequency fc1 when only considering the geometric stiffness and the first-order frequency fb1 when only considering the bending stiffness; determine the third relational function between the frequency fc1 and the cable force T: T= F(fc1); calculate the cable force T based on the second relational function and the third relational function. The invention eliminates the influence of the bending stiffness on the vibration frequency by determining the relationship function between the vibration frequency of the cable and the geometric stiffness and bending stiffness, thereby accurately calculating the cable force of the cable and improving the calculation accuracy of the cable force.

Description

technical field [0001] The invention relates to the technical field of cable force detection of cable-stayed bridges, suspension bridges, and mid- and under-connected tied-bar arch bridges, and is an accurate algorithm for measuring cable forces by the frequency method. Specifically, when cable components When the boundary conditions at both ends can be simplified as hinged support, an accurate method for calculating the axial tension of cable-like components is obtained from the first few orders of natural frequencies of the cable. Background technique [0002] Using the vibration frequency method to measure the axial tension of cable members has been widely used at home and abroad. For cable members that do not consider the bending stiffness, the axial tension force of the cable member with sufficient accuracy can be obtained from the measured vibration frequencies of the first few orders by using a simplified calculation method. When the boundary conditions at both ends ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00
Inventor 姚胜秦司奎蒋洪新高敏张杰
Owner SHANGHAI TONGJI CONSTR QUALITY INSPECTION STATION
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