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A High-Precision Dynamic Measuring Method of Tension in Damping Suspension Rod System

A high-precision, boom-based technology, applied in force/torque/power measuring instruments, measuring devices, instruments, etc., can solve problems such as insufficient precision, and achieve the effect of increasing the matrix condition number, increasing the condition number, and increasing stability

Active Publication Date: 2022-04-12
HOHAI UNIV
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  • Claims
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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a high-precision dynamic measurement method for the tension of the damping boom system, so as to solve the problem of insufficient precision in the prior art

Method used

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  • A High-Precision Dynamic Measuring Method of Tension in Damping Suspension Rod System
  • A High-Precision Dynamic Measuring Method of Tension in Damping Suspension Rod System
  • A High-Precision Dynamic Measuring Method of Tension in Damping Suspension Rod System

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Embodiment

[0184]The application of this method is illustrated below in conjunction with the examples, and compared with the practical formula method proposed by Zui et al. (1996). The practical formula proposed by Zui et al. (1996) is as follows:

[0185]

[0186] in:

[0187] In this embodiment, the problem of force measurement by vibration method of two actual arch bridge suspenders is discussed. The boom is composed of 91 steel wires with a diameter of 7mm. The elastic modulus of the steel wire is 1.95e+005MPa, the mass per unit length of the boom is 27.48kg / m, and the cross-sectional area of ​​the boom is 0.0035mm 2 . Table 1 gives the mechanical parameters of two booms, one of which is a short boom (2.34m) and the other is a long boom (10.2m). The boundary rotation and lateral stiffness of the boom are respectively 12EI / l and 48EI / l 3 . The stiffness and damping values ​​of the damper are selected according to the normal range. At this time, the short boom and long boom ...

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Abstract

The invention discloses a high-precision dynamic measurement method for the tension of a damping boom system, comprising the following steps: establishing a vibration control differential equation and a dynamic eigenvalue equation of the boom system considering the influence of additional mass, boundary rotation stiffness and shock absorber ; The dynamic eigenvalue equation in matrix form is obtained by solving the finite difference method; the derivative function of the frequency of the boom system to its tension, bending stiffness, boundary rotation stiffness and shock absorber damping is solved based on the derivative of the matrix eigenvalue; based on the frequency of the boom The derivative function constructs the parameter sensitivity matrix; establishes the inversion algorithm of the boom system parameters according to the parameter sensitivity matrix and the least square method; obtains multiple target frequency values ​​​​by the method of additional mass; calculates and obtains multiple estimated frequencies according to the estimated system parameters; The system parameters at a given frequency are calculated according to the target frequency value, estimated frequency and inversion algorithm. The method provided by the invention solves the difficult problems of force measurement with short suspenders and system with damped suspenders in actual engineering.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a high-precision dynamic measurement method for the tension of a damping suspender system. Background technique [0002] The test of cable force and hanger force is an important issue in bridge inspection and construction monitoring, and its test accuracy is of great significance for the safety monitoring of bridges in construction and operation stages. The existing cable force testing methods include oil pressure gauge method, pressure sensor method, vibration frequency method and magnetic flux method, among which the vibration frequency method has been widely used in engineering because of its convenience and speed. However, the accuracy of the vibration frequency method is affected by factors such as the sag effect of the cable, bending stiffness, boundary conditions and dampers, and the range of application of the theoretical formula is limited. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/23G01L5/00G06F119/14
CPCG06F30/13G06F30/23G01L5/00G06F2119/14
Inventor 马麟许辉
Owner HOHAI UNIV
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