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A load identification method based on numerical operation and an improved regularization algorithm

A technology of load identification and algorithm, which is applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of tediousness, acquisition, and the limitation that the excitation point cannot be excited, and achieve good applicability, simple and convenient operation, The effect of high recognition accuracy

Active Publication Date: 2019-06-18
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

[0004] In the load identification research, people usually obtain the transfer function matrix of the structure through the hammering method. This method is cumbersome to operate, and is often limited by the structure of the target system. Some excitation points cannot be excited, and the transfer function cannot be obtained. the acquisition of

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  • A load identification method based on numerical operation and an improved regularization algorithm
  • A load identification method based on numerical operation and an improved regularization algorithm
  • A load identification method based on numerical operation and an improved regularization algorithm

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Embodiment Construction

[0055] Combine below Figure 4 with Figure 5 The present invention is further described by the load experiments of two cantilever beams in .

[0056] figure 1 is a flow chart of a load identification method based on numerical calculation and improved regularization algorithm of the present invention. The method uses the parameters of the cantilever beam to establish a regularization model for the load identification of the cantilever beam, and uses the measured acceleration response signal to calculate The dynamic load applied to the cantilever beam can be identified.

[0057] The specific operation steps are as follows:

[0058] 1) Establish the discretized finite element model of the system, and use the load identification algorithm based on explicit Wilson-θ to obtain the load identification model of the structural system.

[0059] The cantilever beam structure is as figure 2 with image 3As shown, assuming that the cantilever beam is a plane beam, the cantilever be...

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Abstract

A load identification method based on numerical operation and an improved regularization algorithm comprises the following steps: step 1, establishing a discrete finite element model of a system, andutilizing an explicit Wilson-theta based load identification method to obtain a load identification model of the structure system through a load identification algorithm; 2, applying a dynamic load tothe structure, and measuring the response of the dynamic load; Step 3, constructing a load identification regularization model; Step 4, determining regularization parameters of the load identification model by using an L curve method, and substituting the regularization parameters into the load identification model to carry out calculation of load identification; 5, calculating is finished, and outputting a load identification result. The method is simple and convenient to operate in practical application, only the parameter data of the structure needs to be known, a corresponding load identification regularization model is established, and an unknown dynamic load can be identified by utilizing a response signal obtained through measurement; In addition, a traditional Tikhonov regularization method is improved, and the dynamic load identification precision of the improved regularization method is higher.

Description

technical field [0001] The invention belongs to the technical field of mechanical structure vibration source identification, and in particular relates to a load identification method based on numerical calculation and improved regularization algorithm. Background technique [0002] The dynamic load is the initial input parameter of the mechanical structure and the power source of various vibrations during the operation of the structure. The acquisition of dynamic load plays an important role in the fields of structural health monitoring, fault diagnosis, active control of vibration and reliability analysis. Only by obtaining accurate and reliable dynamic load can we further use various advanced methods to ensure the reliability of engineering structures and security. [0003] In actual engineering, due to the influence of technical level and measurement conditions, the dynamic load acting on the structure is often difficult to measure directly, and some even cannot be direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 范玉川赵春雨樊潮鲁艳陈晔张宝卢泽宸李朕均于洪晔
Owner NORTHEASTERN UNIV LIAONING
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