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Structural topology optimization design method under random acceleration excitation based on large mass method

A technology of topology optimization and design method, applied in the direction of design optimization/simulation, calculation, instrument, etc., can solve the problems of poor practicability and achieve the effect of strong practicability

Active Publication Date: 2019-10-22
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of existing structural topology optimization methods under random loads, the present invention provides a structural topology optimization design method based on large mass method under random acceleration excitation

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  • Structural topology optimization design method under random acceleration excitation based on large mass method
  • Structural topology optimization design method under random acceleration excitation based on large mass method
  • Structural topology optimization design method under random acceleration excitation based on large mass method

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Embodiment Construction

[0040] refer to figure 1 . The specific steps of the structural topology optimization design method based on the large mass method under random acceleration excitation in the present invention are as follows:

[0041] (a) Establish the finite element model of the design space: divide the rectangular planar structure with length, width, and thickness of 0.8m, 0.4m, and 0.005m into a square grid of 80×40, and impose a mass of 3×10 on the node where the large mass point is located. 7 The large mass point of kg constrains all degrees of freedom except the vertical direction at the large mass point. Set the topology design variable η h The initial value is 0.5. The total number of structural units N h =3200. Given material density ρ=7800kg / m 3 , Young's modulus E=200GPa, the upper limit of mass constraints

[0042] (b) Set the excitation load as a random load f(t) acting vertically upward on the node at the point where the large mass is applied, and the structure has only...

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Abstract

The invention discloses a method for topologically optimally designing structures under random acceleration excitation on the basis of large-mass processes. By the aid of the method, the technical problem of poor practicality of existing methods for topologically optimizing structures under random load can be solved. The technical scheme includes that the method comprises converting multipoint acceleration excitation into force excitation by the aid of the large-mass processes and applying the force excitation onto the structures; computing displacement response root mean squares under random excitation by the aid of pseudo-excitation processes and mode-acceleration processes; designing the structures under constraint effects of structure masses to achieve the purpose of minimizing the displacement response root mean squares of specified positions of the structures. Compared with design methods in the prior art, the method has the advantages that multipoint random acceleration excitement can be implemented, and the method is not limited to carrying out single-point loading on the structures; clear and effective structure configuration can be ultimately designed, accordingly, design requirements of engineering practice on consideration of multipoint acceleration loading can be met, and the method is high in practicality.

Description

technical field [0001] The invention relates to a structural topology optimization method under random loads, in particular to a structural topology optimization design method based on a large mass method under random acceleration excitation. Background technique [0002] Structures in practical engineering are often subject to variable frequency and amplitude loads of various peak and valley sizes and sequences randomly appearing, that is, random loads. For example, the wind excitation in nature, the aerodynamic excitation of aerospace vehicles when they are in service, the road surface excitation due to uneven road surface during driving, and earthquake excitation, etc. Random excitation has a great influence on the normal operation of the structure, and even destroys the structure. Therefore, it is very important to consider the performance of the structure under random excitation when designing the structure configuration. [0003] Document 1 "Zhang W.H., Liu H, Gao T....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 朱继宏何飞张卫红郭文杰杨开科
Owner NORTHWESTERN POLYTECHNICAL UNIV
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