A method for real-time measurement of cable natural frequency and cable force
A technology of natural frequency and real-time measurement, applied in the field of real-time measurement of the natural frequency of the cable and the cable force, can solve the problems of unrealistic, inconvenient operation, and cumbersome process of on-site loading of the cable, and achieve good real-time performance and accuracy. High, easy on-site calibration results
Active Publication Date: 2022-04-05
NINGBO UNIV
View PDF23 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Therefore, the magnetic flux method requires pre-calibration of U s The linear relationship between F and F, and in the pre-calibration, the cable force needs to be known. It will be very inconvenient to load the cables step by step on site, especially for in-service bridges. obviously unrealistic
The current common practice is to pre-install the magnetic flux sensor on the cable, and then transport the cable to the site and install it on the bridge after the calibration is completed in the factory. bridge
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0046] Embodiment: a method for measuring the natural frequency of the cable and the force of the cable in real time, comprising the following steps:
[0047] (1) if figure 2 As shown, the acceleration sensor 2 and the magnetic flux sensor 3 are respectively installed on the cable 1, the acceleration sensor 2 is installed near the middle of the cable 1, the magnetic flux sensor 3 is installed at the bottom of the cable 1, and the magnetic flux sensor 3 adopts a pulse excitation method to pull The cable 1 performs real-time excitation, the sampling frequency of the acceleration sensor 2 is greater than 1000 Hz, the excitation frequency of the magnetic flux sensor 3 is 0.5-1 Hz, and the duty cycle is 50%;
[0048] (2) Calibrate the natural frequency model of cable 1, the specific steps are:
[0049] A. Set the total number of times of loading and the variable of the number of times of loading, record the total number of times of loading as m, and the variable of the number of ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for measuring the natural vibration frequency and force of a cable in real time. By setting an acceleration sensor and a magnetic flux sensor on the cable at the same time, the natural vibration frequency model of the cable is calibrated by using the acceleration sensor and the magnetic flux sensor to construct a The theoretical model between natural frequency and induced voltage makes the two basic physical quantities of cable force measurement form a one-to-one correspondence, and in the case of unknown cable force, it can be realized only by applying different loads on the bridge deck The calibration of the natural vibration frequency model of the cable overcomes the shortcomings of the difficulty in field calibration of the magnetic flux method, especially for the field calibration of in-service bridges. Here, the acceleration sensor only plays a role in calibration. The present invention is essentially based on the vibration frequency Based on the measurement principle of the method, the magnetic flux sensor is used to realize the real-time measurement of the cable natural frequency and cable force; the advantages are good real-time performance, high precision, and simple on-site calibration.
Description
technical field [0001] The invention relates to a technique for measuring the natural frequency and force of a cable, in particular to a method for measuring the natural frequency and force of a cable in real time. Background technique [0002] In recent years, long-span bridges have continued to be built. Cable-stayed bridges and suspension bridges are currently two of the more common types of long-span bridges, and multiple cables are symmetrically installed on them. As the main bearing member of the bridge, the cable force of the cable directly controls the internal force distribution and alignment of the whole bridge. Therefore, in the process of bridge construction and operation, the cable force of each cable must meet the design requirements, otherwise it will seriously affect the safety and stability of the bridge structure. [0003] At present, the methods of cable force measurement in engineering mainly include pressure gauge method, pressure sensor method, vibrati...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02
CPCG01D21/02
Inventor 刘小锋冯志敏胡海刚冯少玉徐俊峰
Owner NINGBO UNIV