A Modal Adjustment Method of Finite Element 3D Model Based on Modal Test Results
A modal test and three-dimensional model technology, applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve the problems of complex structure of launch vehicle, complex connection of cabin sections, large gaps, etc., and achieve the effect of high engineering application value
Active Publication Date: 2019-01-08
BEIJING LINJIN SPACE AIRCRAFT SYST ENG INST +1
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Problems solved by technology
However, due to the complex structure of the launch vehicle and the complex connection of the cabin sections, the modes calculated by the finite element model are generally different from those obtained by the test.
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[0042] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments.
[0043] The present invention is a kind of finite element three-dimensional model modal adjustment method based on modal test results, realizes the automatic adjustment of the finite element model modal of launch vehicle, comprises the following steps:
[0044] Step 1, collect the actual shape and physical size of the solid structure of the launch vehicle, and set up a finite element grid for modal calculation; in this specific embodiment, in the process of establishing the finite element grid, three-dimensional solid elements, shell elements, beams Combination of unit and mass unit.
[0045] Step 2, collecting the modal test results of the solid structure of the launch vehicle; the modal test method is well known in the industry; the modal test results of this step refer to the natural frequencies of each order mode;
[0046] Step 3. In the fin...
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The invention belongs to a test result-based finite element model modal adjusting method, and specifically relates to a carrier rocket modal test result-based finite element model modal adjusting method. According to the method, the adjustment of the modal of a finite element three-dimensional model is realized through automatically adjusting the key parameters which influence the rigidity of the finite element model by taking a carrier rocket modal test result as basis. The method has the following advantages in two aspects: (1) automation: after extracting the key parameters which influence the modal of the finite element model, the modal of the finite element three-dimensional model is optimized and adjusted through an optimization algorithm so as to ensure that the modal of the finite element three-dimensional model agrees with the modal test result; and (2) high efficiency: through the method, the optimization algorithm is combined with a modal calculation method, so that the modal of the finite element three-dimensional model can be adjusted in a relatively short time. The method has the characteristic of openness and has high engineering application value.
Description
technical field [0001] The invention belongs to a finite element model mode adjustment method based on test results, in particular to a finite element model mode adjustment method based on launch vehicle modal test results. Background technique [0002] In the development of launch vehicles, structural dynamics calculations play a vital role in the design. In the calculation of structural dynamics, the finite element method has become the main method; with the development of computer and computing technology, the three-dimensional finite element method has been widely used in the development of launch vehicles. However, due to the complex structure of the launch vehicle and the complex connections of the cabins, the modes calculated by the finite element model generally differ greatly from those obtained by the test. In practical engineering applications, the stiffness of the finite element model needs to be corrected so that the low-order modes are consistent with the moda...
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IPC IPC(8): G06F17/50
Inventor 郑昭虎胡东飞王欢欢龚春叶
Owner BEIJING LINJIN SPACE AIRCRAFT SYST ENG INST