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Method for obtaining inherent frequency of Coriolis flowmeter

A Coriolis flowmeter and natural frequency technology, applied in the field of signal processing, can solve the problems that the model cannot handle complex problems and the amount of calculation is large, and achieve the effect of increasing design difficulty, simple model, and good noise resistance

Active Publication Date: 2022-01-28
中国空气动力研究与发展中心设备设计与测试技术研究所
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Problems solved by technology

However, the above method has the following technical problems: its model is simple and cannot deal with complex problems, and its calculation load is large

Method used

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  • Method for obtaining inherent frequency of Coriolis flowmeter
  • Method for obtaining inherent frequency of Coriolis flowmeter
  • Method for obtaining inherent frequency of Coriolis flowmeter

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Embodiment Construction

[0062] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments may be combined with each other without conflicting with each other.

[0063] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from the scope of this description. Therefore, the protection scope of the present invention is not limited by the following disclosure. limitations of specific examples.

[0064] Please refer to figure 1 , figure 1 It is a schematic flow chart of a method for obtaining the natural frequency of a Coriolis flowmeter. The present invention provides a meth...

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Abstract

The invention discloses a method for obtaining inherent frequency of a Coriolis flowmeter, and relates to the field of signal processing. The method comprises the following steps: obtaining a sampling signal based on a vibration signal of the Coriolis flowmeter in a free attenuation state, truncating the sampling signal to obtain a truncated signal, and performing fast Fourier transform on the truncated signal to obtain an inherent frequency of the Coriolis flowmeter; obtaining an index of a frequency spectrum maximum value of the truncated signal; carrying out two-point interpolation calculation on the frequency spectrums of the truncated signal and the sampling signal in sequence to obtain a sampling signal frequency spectrum offset and an attenuation factor preliminary estimation value so as to obtain an initial parameter of a noise reduction filter; constructing a prediction relational expression by using the linear prediction property of the sinusoidal signal, and further inhibiting the influence of noise through a noise reduction filter to obtain a prediction matrix after noise reduction; and solving the matrix to obtain a prediction coefficient so as to obtain the inherent frequency of the Coriolis flowmeter. According to the method, the Coriolis flowmeter inherent frequency estimation precision can be improved, the calculated amount is reduced, and the inherent frequency obtaining speed is increased.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method for obtaining the natural frequency of a Coriolis flowmeter. Background technique [0002] The digital driver starts the flow tube with the self-excited signal. When the vibration amplitude reaches a certain value, it stops the excitation and enters the zero drive state. At this time, the flow tube is in a free attenuation state; then the natural frequency of the flow tube is obtained by using the parameter estimation algorithm; finally, according to The frequency synthesized drive signal, combined with the nonlinear amplitude control algorithm, drives the flow tube to vibrate with steady amplitude. [0003] The key point of this scheme is that after the excitation is stopped, the natural frequency of the flow tube can be obtained quickly and effectively. When the flow tube is in the state of free attenuation, the vibration model is a single-frequency attenuation real s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G01F1/84
CPCG01F1/8436G06F2218/00G06F2218/04G06F2218/08
Inventor 陈鹏常伟乐开白
Owner 中国空气动力研究与发展中心设备设计与测试技术研究所
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