Cable force measuring method based on linear model coefficient transmission
A linear model and measurement method technology, applied in the direction of tension measurement, force/torque/work measuring instrument, measuring device, etc., can solve the problems that other cables of the same type cannot be applied and limit the application range, etc.
Active Publication Date: 2018-11-23
哈尔滨开博科技有限公司
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Problems solved by technology
[0007] However, the above method still has some problems in practical engineering applications: the linear model established by the cable can only measure the cable force of the cable, and cannot be applied to other cables of the same type. To predict the cable force of the same type of cables, it is necessary to carry out two-stage tension calibration for each cable to obtain the linear model of each cable, and then to predict the cable force of each cable. However, in actual engineering In , the two-stage tensioning of each cable severely limits the applicability of the method
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[0027] The method will be further described in detail below by taking the tension test of a cable of model PES 7-139 as an example.
[0028] The two ends of the cable are loaded with tension through the numerical control jack. The cable of this example is PES 7-139 type, and the gap and the outside are wrapped by polyethylene (PE). Cable 1 length l=68.03m, cable 2 length l=53.608m linear density m=42kg / m, cross-sectional area A=5349mm 2 , the limit cable force T lim =8993kN, this calculates the bending stiffness EI=455.37kN·m.
[0029] According to the above test data, the implementation effect of this method is verified.
[0030] Step a. During the construction tensioning process, apply two levels of cable force to cables 1 and 2 of the same type, and calibrate the cable force T of the cables to be tested respectively. ij and with Cable T ij The corresponding k-order vibration frequency f i11 , f i12 ,..., f ijk (i represents the number of the cable, j represents the ...
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Abstract
A cable force measuring method based on linear model coefficient transmission belongs to the civil engineering technical field; the method comprises the following steps: a, calibrating a cable force Tij of a to-be-measured cable and a k-order vibration frequency corresponding to the cable force Tij; b, respectively fitting a linear regression coefficient of each cable Tij with respect to (see description); c, linearly fitting coefficients between calibrated cables; d, fitting to obtain a linear regression coefficient of Aik with respect to Li; e, introducing the linear regression coefficientsobtained in step d into a linear model, thus obtaining a cable force calculation formula of the cable of this type; f, testing a vibration frequency of a to-be-tested cable of the same type at a random length; g, introducing the frequency fi1 '..fik '..fin ' obtained in step f into the formula of step e, thus calculating the cable force of a random cable of the same type. A conventional linear model cable force measuring method needs to carry out two-stage tension of each cable, thus severely limiting the usage scope of the method; the method of the invention can solve said problems.
Description
technical field [0001] The invention relates to a method for measuring the force of a vibrating cable, belonging 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. Cable force is one of the important parameters in the design of cable system bridges, and it is also an important index for bridge construction control and evaluation of the normal service status of bridges. The accuracy of cable force measurement is affected by many factors, such as cable length, linear density, bending stiffness, boundary conditions, and measured frequency. [0003] In order to improve the test accuracy of the cable force, the existing patent "Cable Force Measurement Method Based on Linear Model Vibration Method", the patent application number is: 201510357998.5, proposes a linear model-based vibration method to measure the c...
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IPC IPC(8): G01L5/04
CPCG01L5/042
Inventor 曾森王建飞李大军陈少峰
Owner 哈尔滨开博科技有限公司