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A Time Domain Calibration Method of High Frequency Base Force Balance Signal

A calibration method and technology of balance, applied in the field of instrument calibration, can solve the problems of inability to perform time history analysis, inability to obtain time history data of aerodynamic loads, inability to process data online in real time, etc., and achieve the effect of real-time online decoupling

Active Publication Date: 2021-10-26
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0006] Among the above methods, method 1 adopts the frequency domain method, which can only correct the power spectrum of the uncoupled signal aerodynamic load in the frequency domain, but cannot obtain the time history data of the corrected aerodynamic load, and cannot perform time history analysis
Method 2 uses a batch processing algorithm to decouple the signal, but this algorithm is an offline algorithm, and all data is used for each operation, and the data cannot be processed online in real time
To sum up, although existing methods 1 and 2 can perform effective dynamic calibration on uncoupled and coupled signals respectively, there are still deficiencies

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  • A Time Domain Calibration Method of High Frequency Base Force Balance Signal
  • A Time Domain Calibration Method of High Frequency Base Force Balance Signal
  • A Time Domain Calibration Method of High Frequency Base Force Balance Signal

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Embodiment Construction

[0061] The present invention will be further described in detail through specific embodiments below, but the embodiments of the present invention are not limited thereto.

[0062] A method for time-domain calibration of high-frequency base force balance signals such as figure 1 shown, including:

[0063] Step 1: Input observation signal x(t)=[x(1),x(2),...,x(k)].

[0064] Step 2: Decouple the observed signal x(t) in real time to obtain the decoupled modal signal q(t).

[0065] In one embodiment, the process of decoupling the measurement signal in real time is as figure 2 shown, including:

[0066] Step 2-1: Initialize signal separation matrix B 0 , set the iteration step size μ(k).

[0067] Step 2-2: Receive the observation signal x(t) point by point in real time, and iterate the received observation signal.

[0068] Step 2-3: Update the signal separation matrix point by point:

[0069] B(k+1)=B(k)+μ(k)[I-y(k)y T (k)-g(y(k))y T (k)+y(k)g T (y(k))]B(k);

[0070] Whe...

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Abstract

The invention belongs to the technical field of instrument calibration, and discloses a time-domain calibration method for a high-frequency base force balance signal, comprising: step 1: inputting an observation signal x(t); step 2: decoupling the observation signal x(t) in real time , to obtain the decoupled modal signal q(t); Step 3: Identify the modal parameters of the modal signal q(t) under the modal coordinates; Step 4: Construct a digital filter according to the modal parameter identification results Correct the modal signal q(t); Step 5: Obtain the corrected aerodynamic load time history y(t) by reverse deduction according to the corrected modal signal. The invention adopts an adaptive blind source separation algorithm to decouple the measurement signal online, identify the natural frequency and modal damping ratio of the modal signal obtained by decoupling, and then construct the corresponding digital filter, and finally get the correction The final real aerodynamic load time history is convenient for further time history analysis. The invention makes up for the deficiency that the existing correction method can only decouple the signal off-line and cannot obtain the time history of the corrected aerodynamic load.

Description

technical field [0001] The invention belongs to the technical field of instrument calibration, and relates to a time-domain calibration method for a high-frequency base force balance signal. Background technique [0002] The high frequency base force balance (HFFB) method is one of the main technical means to evaluate the wind load and wind-induced response of super high-rise buildings. However, this method also has its own shortcomings. The balance model system (BMS) often has a dynamic amplification effect on the measured aerodynamic load. In order to obtain accurate aerodynamic load, a correction method should be used to eliminate this signal distortion and obtain a wider frequency band. aerodynamic signal. HFFB belongs to the category of multi-component balance. Due to the mutual coupling between the components of the balance, the difficulty of signal correction is further increased. Therefore, it is necessary to decouple the coupled measurement signal before signal cor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01G23/01
CPCG01G23/01
Inventor 胡晓琦谢壮宁张乐乐石碧青
Owner SOUTH CHINA UNIV OF TECH
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