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Large-Scale Structure Design Method under Random Excitation

A technology of random excitation and structural design, applied in computing, special data processing applications, instruments, etc., can solve problems such as poor practicability

Active Publication Date: 2017-06-13
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] In order to overcome the shortcomings of poor practicability of existing structural design methods, the present invention provides a large-scale structural design method under random excitation

Method used

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  • Large-Scale Structure Design Method under Random Excitation
  • Large-Scale Structure Design Method under Random Excitation
  • Large-Scale Structure Design Method under Random Excitation

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Embodiment Construction

[0051] refer to Figure 1-2 . The specific steps of the large-scale structure design method under random excitation of the present invention are as follows:

[0052] (a) Establish a design space finite element model: Divide a rectangular planar structure with length, width, and thickness of 0.8m, 0.4m, and 0.001m into a 120×60 square grid, and the left boundary of the structure is fixed. Set the topology design variable η h The initial value is 0.5, the total number of structural units N h =7200. Given material density ρ=7800kg / m 3 and Young's modulus E=200GPa. Given a quality constraint upper bound

[0053] (b) Set the excitation load as a random load f(t) acting vertically downward at the midpoint of the right boundary of the structure, and the structure has only p=1 force load, so the power spectral density matrix S of the random load f (ω) is a 1-dimensional matrix, and its value is set to 2500N 2 / (rad / s), the excitation frequency band of the load is [0, 1884]ra...

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Abstract

The invention discloses a large-scale structural design method under random excitation to solve the technical problem of poor practicality of existing structural design methods. The technical scheme includes that calculating displacement response root mean square under random excitation by means of combination of a pseudo excitation method and a modal acceleration method, and performing structural design by taking the displacement response root mean square of a structural designated position as a target and taking structural quality as constraint. Compared with design method in the background art, analysis precision of random displacement response root mean square is evidently improved to finally design a distinct and effective structural configuration, and accordingly design requirements of large-scale structures in engineering practice can be met. Amount of degrees of freedom of a structure in an embodiment is 14762 and is 3.9 times of that of a structure in the background art, the amount of degrees of freedom of the structure in the background art is 3782, and the structural configuration obtained by the design method is easy to use in practical engineering.

Description

technical field [0001] The invention relates to a large-scale structure design method, in particular to a large-scale structure design method under random excitation. Background technique [0002] Structures in engineering practice are often subject to various random vibration excitations, such as wind excitation in nature and aerodynamic excitation of aerospace vehicles in service. The event of structure failure under random excitation occurs frequently, so it is very important to consider the performance of the structure under random excitation when designing the structure configuration. [0003] The literature "Zhang Q, Zhang WH, Zhu JH, Gao T.Layout optimization of multi-component structures under static loads and random excitations.EngineeringStructures.2012.43:120-128" discloses a displacement response of a structure-specified position under random excitation The root mean square minimization is the goal and the structural volume is the constraint of the structural co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 张卫红刘虎牛草蔡守宇高彤
Owner NORTHWESTERN POLYTECHNICAL UNIV
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