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A Construction Method of Static and Dynamic Stiffness Models of Inclined Suspension Cables

A technology of stiffness model and construction method, applied in the construction of dynamic stiffness model, static field, can solve the problems of neglected components, lack of stiffness, inaccuracy, etc., to achieve the effect of high calculation efficiency and convenient modeling

Active Publication Date: 2022-07-12
HARBIN INST OF TECH
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Problems solved by technology

In the field of power grid transmission engineering, Japanese scholars simplified the wire as a massless spring, and the spring stiffness was taken as EA / L, which was too conservative and inaccurate; VELETSOS et al. obtained a closed expression of the in-plane horizontal stiffness through dynamic analysis of inclined suspension cables , but this expression is the concept of frequency response function in random vibration theory, which includes the phase difference of velocity and acceleration, and does not have the physical meaning of stiffness, and the component of the cable's own weight along the chord direction is ignored in the derivation process, making the inclination angle relatively small Large time errors cannot be ignored

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  • A Construction Method of Static and Dynamic Stiffness Models of Inclined Suspension Cables
  • A Construction Method of Static and Dynamic Stiffness Models of Inclined Suspension Cables
  • A Construction Method of Static and Dynamic Stiffness Models of Inclined Suspension Cables

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specific Embodiment approach

[0333] The present invention proposes a method for constructing a static and dynamic stiffness model of an inclined suspension cable. The use process of the method is as follows: Figure 5 shown. The specific implementation is as follows:

[0334] Description of the problem: There are 8 split high-voltage transmission wires suspended on both sides of the top cross arm of a drum-shaped transmission tower. The transmission wire model is LGJ500 / 35, the tower height is 56.15m, and the transmission wire span is 100m. Only one side of the transmission tower is considered. An 8-degree rare earthquake analysis is carried out for the transmission tower considering the effect of the transmission wire.

[0335] The steps of applying the present invention to establish the stiffness model of the transmission wire (inclined suspension cable) are as follows:

[0336] Step 1: Establish the static stiffness K of the inclined suspension cable st

[0337] According to the formula Calculate...

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Abstract

The invention provides a method for constructing a static and dynamic stiffness model of an inclined suspension cable, which includes the following steps: step 1, establishment of problem description and cable shape function; step 2, establishment of the motion equation of the cable element; step 3, solving Equation of motion to obtain the frequency response function; Step 4, static stiffness K st Step 5, the establishment of the dynamic coefficient of the cable; Step 6, the establishment of the static and dynamic stiffness model of the inclined suspension cable. The present invention fully considers the dynamic characteristics of the cable structure, including the damping and the minimum number of necessary vibration modes, and forms a mechanical model of the stiffness of the inclined suspension cable with the participation of multi-order vibration modes. Injury rapid assessment.

Description

technical field [0001] The invention belongs to the technical field of power grid transmission engineering and cable-stayed bridges, in particular to a method for constructing a static and dynamic stiffness model of an inclined suspension cable. Background technique [0002] At present, some scholars have carried out research on the overall structure of cable-stayed bridge or transmission tower line system. Among them, in the field of cable-stayed bridge research, the cable is simulated by truss element, and the elastic modulus of the material is corrected by the Ernst formula to consider the sag effect of the cable. The derivation process of Ernst formula ignores the component of the cable's own weight along the chord direction, and belongs to the result of static analysis, without considering the dynamic effect of the cable. In the field of power grid transmission engineering, Japanese scholars simplified the conductor as a massless spring, and the spring stiffness was ta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F119/14
CPCG06F30/23G06F2119/06Y02T90/00
Inventor 支旭东龚俊商文念范峰
Owner HARBIN INST OF TECH
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