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Method for measuring blast time-frequency characteristic of structure roof of low-rise building

A measurement method and roof technology, which are applied in the field of wind engineering, can solve the problems that the time and frequency resolution of the short-time Fourier transform window function cannot be optimized at the same time, and the physical meaning is unclear.

Inactive Publication Date: 2018-08-17
CHONGQING JIAOTONG UNIVERSITY
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Problems solved by technology

Although this method can perform time-frequency analysis on the signal, it is limited by the W. Heisenberg uncertainty criterion, so that the time and frequency resolution of the short-time Fourier transform window function cannot be optimal at the same time.
Although the Hilbert-Huang transform has good precision, its physical meaning is still unclear

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  • Method for measuring blast time-frequency characteristic of structure roof of low-rise building
  • Method for measuring blast time-frequency characteristic of structure roof of low-rise building
  • Method for measuring blast time-frequency characteristic of structure roof of low-rise building

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Embodiment Construction

[0075] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0076] 1 Stationary test

[0077] 1.1 Stationary test method

[0078] Signal stationarity testing methods mainly include run analysis and trend analysis (Levitan, 1988). Among them, the trend analysis is suitable for the analysis of the monotone signal, and the run length analysis is more suitable for the analysis of the pulsating signal, so this paper adopts the run length analysis method. The specific analysis process is as follows:

[0079] (1) Sampling is performed first to obtain a series of data samples.

[0080] (2) Calculate the sample average study positive and negative situation. like It is recorded as "+", if Recorded as "-".

[0081] (3) Call the consecutive "+" or "-" as a run. Remember N 1 is the number of occurrences of "+", N 2 is the number of occurrences of "-", N=N 1 +N 2 , U is the total number of runs....

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Abstract

The invention relates to a method for measuring a blast time-frequency characteristic of a structure roof of a low-rise building, and belongs to the field of wind engineering. The method comprises thefollowing steps of S1) detecting the smoothness; S2) detecting the pulsated wind speed smoothness; S3) carrying out continuous and discrete wavelet transformation; and S4) analyzing the time-frequency characteristic. Thus, the blast time-frequency characteristic of the structure roof of the low-rise building is measured effectively, and determination basis is provided for construction of the structure roof of the low-rise building.

Description

technical field [0001] The invention belongs to the field of wind engineering, and relates to a method for measuring time-frequency characteristics of wind pressure on a low building roof. Background technique [0002] In the field of wind engineering, statistical characteristics such as expectation and variance are generally used to characterize the statistical characteristics of wind load signals, and the power spectrum based on Fourier transform is used to characterize the energy distribution of each frequency component in the signal, but the above are all based on the signal The stationarity assumption of the signal, that is, the statistical characteristics of the signal do not change with time, and the frequency domain characteristics do not change with time, so that the time domain and frequency domain of the signal can be analyzed independently. However, in practical engineering, wind load signals often show non-stationarity, and methods such as Fourier transform cann...

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Application Information

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IPC IPC(8): G01M9/06
CPCG01M9/067
Inventor 王旭钱骥李华强
Owner CHONGQING JIAOTONG UNIVERSITY
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