Bridge impact coefficient optimization method based on parameter identification technology

A technology of parameter identification and impact coefficient, applied in electrical digital data processing, design optimization/simulation, special data processing applications, etc., to achieve the effect of improving comfort, reducing bridge damage, and providing good technical support

Inactive Publication Date: 2017-11-17
ZHENGZHOU UNIV
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Problems solved by technology

[0004] The invention proposes a bridge impact coefficient optimization method based on parameter identification technology, which solves the calculation of the bridge impact coef

Method used

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  • Bridge impact coefficient optimization method based on parameter identification technology
  • Bridge impact coefficient optimization method based on parameter identification technology
  • Bridge impact coefficient optimization method based on parameter identification technology

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specific Embodiment approach 1

[0154] Table 4 Optimization results

[0155]

[0156] A schematic diagram of an underground pipeline such as Figure 10 As shown (the notch is to see the longitudinal section clearly), Figure 11 It is a detailed drawing of the longitudinal section of the pipeline. The pipeline is composed of a base and a steel strip. The pipeline parameters: the diameter of the pipeline is 1800mm, the length of each unit L=140mm, LC=70mm, the parameters of the steel strip: B=30mm, C=50mm, height H=60mm. The pipeline is buried underground, and the coupled vibration of the vehicle and the road will have a dynamic effect on the pipeline, and the pipeline will have a greater response than the static load. If the pipeline deforms too much, it will cause great harm to the road, so the deformation of the pipeline should be controlled at a certain level. When the deformation of the pipeline is certain, the method of this paper can be used to optimize the thickness of the steel strip of t...

specific Embodiment approach 2

[0157] Specific implementation mode 2: Optimization of bridge bearings.

[0158] The bearing is an important part of the bridge. It supports the superstructure and transmits the load on the bridge pier, so as to ensure the expected displacement function of the superstructure under the action of load, temperature change or other factors. The support must have sufficient bearing capacity to ensure safe and reliable transmission of the support reaction force. When the vehicle is running on the bridge surface, it will generate coupled vibration with the bridge, and the support reaction force should be included in the impact force. Apply the method in this paper to optimize the circular plate rubber bearing, such as Figure 12 As shown, the circular plate rubber bearing is composed of a stiffened steel plate 1 and a rubber layer 2, which can reduce the reaction force of the bearing and reduce the plane area required for the design of the bearing. The plane area of ​​the optimized...

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Abstract

The invention provides a bridge impact coefficient optimization method based on the parameter identification technology, solving the problems in the calculation of impact coefficient and the optimization of impact coefficient sensitivity in stochastic dynamics, which can reduce the damage of bridge. The method is carried out in this manner: (1) defining a vehicle model, (2) deriving the equation of motion MU<..>+CU<.>+KU=F<g>+F<w>, according to the D'Alembert's principle; using the PIM method to solve deterministic response and using the PEM to calculate random response, U(t)=integral H(t-[tau], t)(F<g>([tau])+F<w>([tau])) differential [tau], t belongs to (0, t). The invention provides an effective optimization method for non-stationary random vibration of a vehicle-bridge coupling system, and improves comfort and safety of the vehicle and the bridge. The method of the invention has both accuracy and efficiency, and can provide better technical support for vehicle-bridge coupling vibration sensitivity analysis and optimization. The computational time required by the PEM-PIM numerical method is more than ten times that of the Newmark method when the computational accuracy is the same, and the method of optimizing the sensitivity of the self-identification design variables is proposed.

Description

technical field [0001] The invention belongs to the field of vehicle-bridge coupling random vibration, and in particular relates to a new method for evaluating a vehicle-bridge coupling system. Background technique [0002] For the optimal design of structural dynamic response under random excitation, it is quite difficult and complicated to solve because it involves both structural random response analysis and optimal design. There have been many research works on the sensitivity analysis of dynamical optimization problems. For example, Pantelides et al. proposed the MISA (modified iterated simulated anneding) algorithm to solve structural optimization problems with dynamic stress and dynamic displacement constraints, and Chen et al. proposed a perturbation method for solving dynamic response sensitivity, but these methods are severely limited due to heavy calculations practical application. In order to obtain the global optimal solution, it is necessary to analyze the se...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 徐文涛张泽通王鲲鹏廖敬波唐光武陈勇杰王红鲁
Owner ZHENGZHOU UNIV
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