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Rapid determining method of structural response driven by broadband and unsteady-state signal

An unsteady, dynamic response technology, applied in special data processing applications, instruments, electrical digital data processing, etc.

Inactive Publication Date: 2013-07-24
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

If the selection of Δt is not considered, this discretization may also cause great problems in the calculation of broadband and non-stationary excitation signals

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  • Rapid determining method of structural response driven by broadband and unsteady-state signal
  • Rapid determining method of structural response driven by broadband and unsteady-state signal

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Embodiment Construction

[0026] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the invention.

[0027] figure 1 It shows the implementation process of the method for determining the structural response under the wavelet decomposition broadband and unsteady signal excitation provided by the embodiment of the present invention.

[0028] The determination method includes the following steps:

[0029] Step S101, select a wavelet basis function, and determine the scale factor and phase factor;

[0030] Step S102, comparing with the signal in the analysis period, calculating the wavelet transform coefficient at this moment;

[0031] Step S103, adjust the phase factor and the analysis time period of ...

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Abstract

The invention discloses a rapid determining method of structural response driven by broadband and an unsteady-state signal and is based on wavelet decomposition. The method is based on structural response calculation of drive signal decomposition angles, the facts that engineering precision of calculated results is satisfied and the stability of the computational results is ensured are well achieved, and computational efficiency is significantly improve. The method comprises the following steps of (1) selecting a wavelet basis function, conducting the wavelet decomposition on a drive signal, and obtaining narrow-band and steady signals of different frequency bands; (2) adopting a mode superposition method to calculate low-frequency excitation response, adopting a Newmark method to calculate intermediate frequency excitation response and adopting an immediate integration method to calculate high-frequency excitation response; (3) adopting a linear interpolation method to conduct interpolation, and conducting dynamic response interpolation on a low-frequency drive signal, an intermediate frequency drive signal and a high-frequency drive signal in step (2); and (4) conducting linear superposition of dynamic response interpolation on the low-frequency drive signal, the intermediate frequency drive signal and the high-frequency drive signal, and obtaining dynamic response, driven by original broadband and unsteady-state load signals, of a linear system.

Description

technical field [0001] The invention belongs to the technical field of structural response calculation, and in particular relates to a method for determining structural response under wavelet decomposition broadband and unsteady signal excitation. Background technique [0002] With the continuous development of modern machinery and equipment in the direction of large-scale, high-speed, lightweight and heavy-duty, the working environment is becoming more and more complex, and the dynamic loads on the structure, that is, the excitation signals, are becoming more and more diverse. The excitation signals involved in the calculation of the structural response have gradually expanded from the original linear steady-state signals to unsteady-state signals; from the perspective of frequency, the previous low-frequency signal excitations have gradually changed to intermediate-frequency and high-frequency signal excitations; from the frequency band From a perspective, the excitation s...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 吕中亮安培文汤宝平周传德黎泽伦
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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