Dynamic calibration method for high-frequency force balance

A calibration method and balance technology, applied in aerodynamic tests, machine/structural component testing, instruments, etc., can solve problems affecting signal separation effect, rough approximation, modal damping ratio identification error, etc., and achieve reliable separation effect , good power calibration effect, and simplified test steps

Active Publication Date: 2017-05-24
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0007] Among the above methods, the BMS natural frequency and damping ratio identified by the conventional tapping method in method 1 cannot reflect the influence of wind-structure interaction (WSI). This problem also exists in method 2. Ignoring the WSI effect will lead to the BMS natural frequency In particular, the error in the identification of the modal damping ratio will affect the correction effect of the measurement signal at the cross-resonance peak, so that the signal cannot be effectively corrected across the resonance region; method 2 uses a preconceived method to assume the mode shape of the BMS, This is equivalent to thinking that the signal separation matrix of the

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  • Dynamic calibration method for high-frequency force balance
  • Dynamic calibration method for high-frequency force balance
  • Dynamic calibration method for high-frequency force balance

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Embodiment 1

[0069] A dynamic calibration method for high-frequency base force balances for proportional damping, such as figure 1 , including the following steps:

[0070] Step 1: Whiten the measured signal x(t) to obtain the whitened signal z(t);

[0071] Step 2: Seek the orthogonal matrix V so that z(t)=Vq(t), and then calculate the separation signal q(t);

[0072] Step 3: Under the modal coordinates, identify the natural frequency and modal damping ratio of the separated signal;

[0073] Step 4: Correct the separation signal according to the identified parameters;

[0074] Step 5: Inversely infer from the corrected separation signal to obtain the corrected aerodynamic load.

[0075] Specifically, let the mixed model be

[0076] x(t)=Φq(t) (1)

[0077] where x(t), Φ and q(t) are the model base load (overturning moment, torque and shear force), mixing matrix and source signal (ie, modal response signal) measured by HFFB, respectively. The source signal q(t) obtains the observed sig...

Embodiment 2

[0145] A method for dynamic calibration of high-frequency base force balances for non-proportional damping, such as figure 2 , including the following steps:

[0146] Step 1: Signal preprocessing: shift the phase of the measurement signal x(t) by 90° to get x 90 (t), and then assemble the two into a complex signal;

[0147] Step 2: Whiten the assembled complex signal;

[0148] Step 3: Find the orthogonal matrix V, calculate the complex mixing matrix Φ and the complex separation matrix B, and then obtain the complex separation signal q(t);

[0149] Step 4: Under the modal coordinates, perform modal parameter identification on the complex separation signal;

[0150] Step 5: Correct the complex separation signal according to the identified parameters;

[0151] Step 6: Inversely infer from the corrected complex separation signal to obtain the corrected aerodynamic load.

[0152] For non-proportional damping, some improvements need to be made on the basis of the method in Exa...

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Abstract

The invention discloses a dynamic calibration method for a high-frequency force balance, which comprises the steps of performing whitening on a measurement signal x(t) to acquire a whitened signal z(t); seeking an orthogonal matrix V, enabling the whitened signal z(t) to equal to Vq(t), and thus acquiring a separated signal q(t); performing natural frequency and modal damping ratio recognition on the separated signal in modal coordinates; correcting the separated signal according to recognized parameters; and inversely deducing according to the separated signal to acquire a corrected pneumatic load. According to the invention, separation is performed on a coupling signal, and for independent components acquired by separation, natural frequency and modal damping ratio recognition is performed on the separated signals one by one by adopting a curve fitting method through combining aerodynamic characteristics, so that a dynamic amplification effect of a modal coupling system is corrected and eliminated, a real aerodynamic load spectrum density matrix is acquired finally, the reliability of parameter recognition and corresponding HFFB (High-Frequency Force Balance) dynamic signal calibration can be improved to the maximum extent, and an important basis is laid for subsequent accurate estimation for high-rise building prototype wind-induced responses.

Description

technical field [0001] The invention belongs to the technical field of instrument calibration, and in particular relates to a dynamic calibration method of a high-frequency base force balance. Background technique [0002] The high-frequency base force balance (HFFB) technology is widely used in the wind resistance test research of super high-rise buildings due to its simple model making and short test period. HFFB belongs to the category of multi-component (usually five-component or six-component) balances. Multi-component balances will have problems of mutual interference or coupling between components to varying degrees. Usually, it is necessary to calibrate before leaving the factory to determine the simulation of each component and the corresponding sensor output. The transformation matrix of the signal finally achieves decoupling. Strictly speaking, this calibration technique is only suitable for static measurement. When the balance is installed on the measured model,...

Claims

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Application Information

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IPC IPC(8): G06K9/00G01M9/06
CPCG01M9/06G06F2218/00
Inventor 张乐乐谢壮宁余先锋石碧青
Owner SOUTH CHINA UNIV OF TECH
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