Model modification method with damp considered based on basic stimulation response data
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A technology of stimulus response and model correction, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as increasing test costs, reducing product design efficiency, and reducing the accuracy of dynamic response predictions
Inactive Publication Date: 2014-06-25
HARBIN INST OF TECH
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[0005] The present invention is to solve the problem that the damping correction is not considered in the existing response-based model correction method, which leads to a decrease in the prediction accuracy of the model f...
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specific Embodiment approach 1
[0033] Specific implementation mode 1: The damping-based model correction method based on the basic excitation response data of this implementation mode is implemented in the following steps:
[0034] 1. First, use the finite element software to establish the finite element simulation model of the system. After the finite element simulation model is established, the stiffness K, structural damping G, viscous damping C and mass matrix M in the physical matrix are exported to obtain a system considering damping Kinetic equations:
[0035] ([K]+i[G]+iω[C]-ω 2 [M]){u}={f}
[0036] Among them, the stiffness K, structural damping G, viscous damping C, and mass matrix M are partitioned according to the connection with the shaking table in the finite element simulation model, and the sub-matrix is obtained:
[0037] [ K ] = [ ...
specific Embodiment approach 2
[0053] Embodiment 2: This embodiment is different from Embodiment 1 in that: the finite element software in the step 1 is MSC.Nastran.
[0054] Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0055] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is:
[0056] In the first step, for the viscous damping C, the Rayleigh damping assumption is used to fit the viscous damping coefficient:
[0057] The damping matrix is Rayleigh damping, and Rayleigh damping assumes that the damping is linearly related to the mass matrix and stiffness matrix;
[0058] C=αM+βK
[0059] where α, β are viscous damping coefficients, same as modal damping ξ i (Can be determined by modal test or identified by telemetry signal)
[0060] The relationship is as follows
[0061] ξ i = 1 2 ω i ( α + β ω i 2 )
[0062] The constants α, β were det...
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Abstract
The invention discloses a model modification method with damp considered based on basic stimulation response data and relates to model modification methods with damp considered. The model modification method with the damp considered based on the basic stimulation response data aims to solve the problem that damp modification is not considered in the prior art and comprises the steps that (1) a finite element model is established, and partitioning is conducted on a physic matrix of the model; (2) a transfer function based on basic stimulation is obtained by means of matrix transformation; (3) test data are introduced, and a deviation function of the test data and simulation data is established; (4) a model modification equation is established according to the relation between the deviation function and physic parameter deviation, and required modification can be obtained by solving the equation; (5) a modification parameter obtained in the step (4) is plugged into the finite element simulation model, and then a modified finite element simulation model is obtained. The model modification method with the damp considered based on the basic stimulation response data is applied to the field of finite element simulation of structures as well as the relevant fields such as the test field and the design field.
Description
technical field [0001] The present invention relates to a method of model revision considering damping. Background technique [0002] With the continuous development of industrial technology, the traditional method of product design relying on experimental technology is far from meeting the needs of designers. Utilizing the modern high-speed development of computer technology, it has been widely used by designers to realize the prediction of products through computer simulation. Finite element technology is a computer simulation technology with strong engineering practical application value. The use of finite element model can quickly realize the prediction of various mechanical environments and characteristics of products. [0003] Finite element model correction is an important research content in the field of modern mechanical simulation, especially for large and complex structures (satellites, rockets, spacecraft, etc.), model correction can effectively improve the pred...
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