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Rotational freedom frequency response function computing method of complex mechanical structure

A technology of frequency response function and mechanical structure, which is applied in computing, electrical digital data processing, special data processing applications, etc., and can solve problems such as low precision, high requirements for T-block installation, and inconvenient implementation.

Active Publication Date: 2013-01-16
XI AN JIAOTONG UNIV
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Problems solved by technology

This method has high requirements for the installation of the T-shaped block, which is inconvenient to implement, complicated in the calculation process, and low in accuracy.

Method used

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  • Rotational freedom frequency response function computing method of complex mechanical structure
  • Rotational freedom frequency response function computing method of complex mechanical structure
  • Rotational freedom frequency response function computing method of complex mechanical structure

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Embodiment Construction

[0069] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0070] see figure 1 , decompose the complex mechanical structure to be analyzed into substructure A and substructure B, substructure A can be accurately modeled by the finite element method, select the first measuring point on substructure A, on the joint surface of substructure A and B Select the second measuring point;

[0071] Further, the aforementioned substructure A and substructure B are combined through damping, rotational stiffness and translational stiffness.

[0072] When it comes to frequency response functions, be sure to point out the excitation point and response point corresponding to the frequency response function. The first measuring point and the second measuring point can be selected according to the excitation point and the response point. If the frequency response fu...

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Abstract

The invention relates to a rotational freedom frequency response function estimation method based on the response coupling technology. The method is mainly suitable for estimation of rotational freedom frequency response function in a complex mechanical structure. The method includes: utilizing the receptance coupling technology, estimating rotational freedom frequency response function according to needs, decomposing the complex mechanical structure into a substructure A and a substructure B, choosing a first measuring point, at a position convenient for measuring, on the substructure A, and choosing a second measuring point on a joint surface of the substructure A and the substructure B; utilizing the hammer impact excitation method to measure frequency response function of three translational freedom degrees, and solving a frequency response function matrix on the joint surface of the substructure A and the substructure B; and calculating to obtain all frequency response functions at the two measuring points related to rotational freedom. The rotational freedom frequency response function estimation method based on the response coupling technology is convenient to implement and accurate in calculation result and provides another effective technology for estimation of rotational freedom frequency response function.

Description

technical field [0001] The invention belongs to the technical field of analysis of complex mechanical structures, and relates to a calculation method for frequency response functions of rotation degrees of freedom of complex mechanical structures. Background technique [0002] The widely used finite element technique can achieve high precision when analyzing simple mechanical structures, but it is difficult to obtain satisfactory results when using it to model and analyze complex mechanical structures. One of the reasons is that people do not have a clear understanding of the coupling relationship between subsystems in complex structures, and often unreasonably simplify it when modeling, resulting in low accuracy of the established model and difficult to match the experimental results. Therefore, for the finite element model of complex mechanical structure, it needs to be corrected to improve the accuracy. [0003] A high-quality frequency response function is the basis for...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 曹宏瑞何正嘉訾艳阳陈雪峰张周锁李兵
Owner XI AN JIAOTONG UNIV
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