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Dynamics calculating method of frequency varying characteristic damping rod structure

A calculation method and damping rod technology, applied in the fields of calculation, special data processing applications, instruments, etc., can solve problems such as unproven and unprovided cantilever damping rod poles

Inactive Publication Date: 2014-08-20
FUDAN UNIV +1
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Problems solved by technology

However, Zhou Shaochong’s paper did not give the number of poles in the rational polynomial of the dynamic stiffness of the free end of the cantilever damping rod, nor did he prove that the five residue matrices in the rational polynomial expression of the dynamic stiffness of the free end of the damping rod are rank-2, rank -4, rank-2, rank-1 and rank-1 matrices

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  • Dynamics calculating method of frequency varying characteristic damping rod structure
  • Dynamics calculating method of frequency varying characteristic damping rod structure
  • Dynamics calculating method of frequency varying characteristic damping rod structure

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Embodiment Construction

[0094] The technique of the invention can carry out model polycondensation on the frequency-variable characteristic damping rod, greatly reducing the degree of freedom of the damping rod model, thereby improving the calculation efficiency of dynamic analysis of the structure containing the damping rod. The specific implementation process includes the following steps:

[0095] (1) Numerical calculation of the restraint reaction force (and reaction moment) of the cantilever damper rod under the excitation of simple harmonic displacement (and rotation angle)

[0096] A general-purpose program is used to calculate the three-dimensional finite element model of a cantilever damper rod excited by harmonic displacement (and rotation angle) at several frequencies (such as figure 1 shown) constraint reaction force, there are four groups of excitation states (such as figure 2 shown). The excitation frequency is determined according to the approximation effect. In this example, three e...

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Abstract

The invention belongs to the technical field of structural dynamics and finite element calculation, and particularly relates to a dynamics calculating method of a frequency varying characteristic damping rod structure. The method includes the specific steps that firstly, functional approximation is conducted on the finite element calculation result of the constraint reaction generated when a cantilever damping rod is stimulated by harmonic displacements of different states at the free end, so that a five-pole rational polynomial expression of the dynamic stiffness of the end is obtained; secondly, the five-pole rational polynomial expression of the dynamic stiffness of the end of a free damping rod is obtained by the adoption of the condition that the free damping rod does not generate constraint reaction under the situation of rigid body motion; finally, the three-dimensional finite element dynamics model of the damping rod is condensed to be of twenty-two degrees of freedom, the damping rod is assembled with the stiffness and damping matrices of other parts of the structure, then a dynamics equation of an integrated system is established, and thus the related dynamics calculation of the frequency varying damping rod structure is carried out. By the method, the calculation efficiency of the dynamics problem containing the damping rod structure is greatly improved.

Description

technical field [0001] The invention belongs to the technical fields of structural dynamics and finite element calculation, and in particular relates to a structural dynamics calculation method of a damping rod with frequency-variable characteristics. Background technique [0002] Zhou Shaochong introduced the modeling method of the condensation model of the viscoelastic damping element in his dissertation "Analysis Method and Design Technology of Bracket Type Passive Damping Star-Arrow Adapter" (Fudan University, May 2009). However, Zhou Shaochong’s paper did not give the number of poles in the rational polynomial of the dynamic stiffness of the free end of the cantilever damping rod, nor did he prove that the five residue matrices in the rational polynomial expression of the dynamic stiffness of the free end of the damping rod are rank-2, rank -4, rank-2, rank-1 and rank-1 matrices. The invention clarifies the specific expression form of the rational polynomial of the dyn...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张美艳陈斌刘靖华狄文斌林剑锋唐国安
Owner FUDAN UNIV
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