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Vibration method stay cable force measuring method by employing sinusoidal vibration exciter and video instrument with introduction of vibration displacement

A technology of vibration displacement and measurement method, applied in the direction of tension measurement, etc., can solve problems such as the inability to meet the requirements of accurate cable force

Active Publication Date: 2018-05-08
哈尔滨开博科技有限公司
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Problems solved by technology

Therefore, when the boundary conditions have a great influence on the cable force, the existing vibration method cable force measurement method cannot meet the requirements of accurate cable force

Method used

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  • Vibration method stay cable force measuring method by employing sinusoidal vibration exciter and video instrument with introduction of vibration displacement
  • Vibration method stay cable force measuring method by employing sinusoidal vibration exciter and video instrument with introduction of vibration displacement
  • Vibration method stay cable force measuring method by employing sinusoidal vibration exciter and video instrument with introduction of vibration displacement

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Embodiment Construction

[0030] The specific embodiments of the present invention are further described in detail below.

[0031] A kind of utilization sinusoidal exciter and video instrument of the present embodiment, the method for measuring the cable force of the vibratory method that introduces vibration displacement, comprises the following steps:

[0032] Step a: Estimate the basic natural frequency (hereinafter referred to as fundamental frequency) f 1 possible range [f D , f U ]. where f D is the fundamental frequency f 1 The lower bound of the possible range, f U is the fundamental frequency f 1 The upper bound of the possible range. where the range [f D , f U ], which can be calculated by the following formula

[0033]

[0034]

[0035] In the formula, L is the cable length (m), EI is the bending stiffness of the cable section (N m 2 ), m is the mass per unit length (kg / m), T 1 is the estimated lower limit of cable tension (N), T 2 is the estimated cable tension (N) upper ...

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Abstract

The invention provides a vibration method stay cable force measuring method by employing a sinusoidal vibration exciter and a video instrument with the introduction of vibration displacement, and belongs to the technical field of civil engineering. The method includes: firstly, estimating the fundamental frequency range of the cable, installing the vibration exciter at the position of half of thelength of the cable, enabling the vibration exciter to perform frequency sweeping excitation in the estimated fundamental frequency range, recording the exciting frequency at the moment as the cable self-vibration frequency f1 when resonance occurs to the cable, observing and recording the vibration displacement [phi]i of a certain section of the cable at a certain instant by employing the video instrument, and finally calculating the cable force by employing a vibration mode cable force recognition model. According to the method, a value calculating method is proposed by employing a certain self-vibration frequency f of the cable and several vibration mode components of corresponding vibration modes, and the pulling force of the stay cable can be recognized in the condition of unknown boundary conditions.

Description

technical field [0001] The invention relates to a method for measuring cable force of a vibration method combined with vibration displacement, and belongs to the technical field of civil engineering. Background technique [0002] Cable system bridges mainly transmit and distribute force through cables, and cables are the main force-bearing components of cable system bridges. The cable force of the cables is an important indicator for the construction control of cable system bridges and the evaluation of the normal service status of bridges. [0003] Two key problems need to be solved when the cable force test of the vibration method is used: 1) the identification of the natural frequency of the cable, and 2) the determination of the corresponding relationship between the cable force and the natural frequency. Under the conditions of existing measuring instruments and analysis means, the accuracy of measuring frequency can reach 0.005Hz. Therefore, the accuracy of frequency...

Claims

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Application Information

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IPC IPC(8): G01L5/04
Inventor 曾森陈少峰李大军王建飞
Owner 哈尔滨开博科技有限公司
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