CN-117516764-B - In-phase feedback excitation method and system for vibrating wire sensor

CN117516764BCN 117516764 BCN117516764 BCN 117516764BCN-117516764-B

Abstract

The invention discloses an in-phase feedback excitation method and system of a vibrating wire sensor, comprising the following steps: first, the frequency of the sine wave signal is measured to obtain the vibration frequency of the oscillation signal generated by the vibrating wire sensor. Then, by a phase adaptive compensation algorithm, a phase delay between an excitation signal and an oscillation signal of the vibrating wire sensor due to filtering or the like is calculated from the measured vibration frequency. The sending time of the excitation signal of the next period can be determined according to the calculated phase delay, and when the detection time reaches the sending time, the sine wave excitation signal with the same frequency and the same phase is generated according to the vibration frequency to excite the vibrating wire sensor, so that the phase difference between the excitation signal and the sensor oscillation signal is eliminated. The vibration amplitude of the vibrating wire sensor in the detection process can be prevented from weakening by the circulation.

Inventors

HU JIANAN
DUAN MIN
REN QUANLI
YANG NAIHENG
CHEN JINGWEN
OU ZUGUO
ZHU RONGJIANG
XIA QI

Assignees

重庆物康科技有限公司

Dates

Publication Date: 20260508
Application Date: 20231113

Claims (8)

1. An in-phase feedback excitation method of a vibrating wire sensor is characterized by comprising the following steps of: acquiring a sine wave signal generated by a vibrating wire sensor under the action of an excitation signal in the previous period, and performing frequency measurement on the sine wave signal to obtain the vibration frequency of the vibrating wire sensor; Calculating phase delay between an excitation signal and an oscillation signal of the vibrating wire sensor by adopting a phase self-adaptive compensation algorithm according to the vibration frequency, and determining the sending moment of the excitation signal of the next period through the phase delay; when the detection time reaches the sending time of the excitation signal, the excitation signal with the same frequency and phase is generated to excite the vibrating wire sensor according to the vibration frequency; The phase adaptive compensation algorithm includes: adopting a corresponding phase delay function, and respectively calculating phase delays corresponding to all links in the excitation process according to the vibration frequency; And calculating the phase delay between the excitation signal and the oscillation signal by combining the phase delay corresponding to each link, wherein the specific calculation formula is as follows: ; Wherein, the For the coil resistance of the vibrating wire sensor, Is the inductance of the LC low frequency filter, Is the capacitance of the LC low frequency filter, Is a constant value, and is used for the treatment of the skin, In order to be a cut-off frequency, , Is the vibration frequency.
2. The method of in-phase feedback excitation of a vibrating wire sensor of claim 1, wherein frequency measuring the sine wave signal comprises shaping the sine wave signal into a rectangular wave signal of equal frequency and equal amplitude.
3. An in-phase feedback excitation system for a vibrating wire sensor, comprising: The filtering and amplifying module is configured to filter and amplify a voltage signal generated by the vibrating wire sensor under the action of an excitation signal in the previous period to obtain a sine wave signal; the self-adaptive compensation module is configured to perform frequency measurement on the sine wave signal to obtain the vibration frequency of the vibrating wire sensor and obtain the vibration frequency of the vibrating wire sensor; Calculating phase delay between an excitation signal and an oscillation signal of the vibrating wire sensor by adopting a phase self-adaptive compensation algorithm according to the vibration frequency, and determining the sending moment of the excitation signal of the next period through the phase delay; When the detection time reaches the sending time, the self-adaptive compensation module generates an excitation digital signal with the same frequency and phase according to the vibration frequency; an analog-to-digital conversion module configured to convert the excitation digital signal to an analog voltage signal; a power amplification and filtering module configured to perform power amplification and smoothing filtering on the analog voltage signal; The phase adaptive compensation algorithm includes: adopting a corresponding phase delay function, and respectively calculating phase delays corresponding to all links in the excitation process according to the vibration frequency; And calculating the phase delay between the excitation signal and the oscillation signal by combining the phase delay corresponding to each link, wherein the specific calculation formula is as follows: ; Wherein, the For the coil resistance of the vibrating wire sensor, Is the inductance of the LC low frequency filter, Is the capacitance of the LC low frequency filter, Is a constant value, and is used for the treatment of the skin, In order to be a cut-off frequency, , Is the vibration frequency.
4. The vibrating wire sensor in-phase feedback excitation system of claim 3, wherein the filter amplification module comprises a second order butterworth filter.
5. The vibrating wire sensor in-phase feedback excitation system of claim 4, wherein the second order butterworth filter is a low pass filter.
6. The vibrating wire sensor in-phase feedback excitation system of claim 3, further comprising a signal shaping module configured to convert the sine wave signal into a constant amplitude rectangular wave signal of the same frequency, the adaptive compensation module performing frequency measurement on the constant amplitude rectangular wave signal to obtain the vibration frequency of the vibrating wire sensor.
7. The vibrating wire sensor in-phase feedback excitation system of claim 3, wherein the adaptive compensation module comprises: The frequency measurement unit is configured to perform frequency measurement on the sine wave signal to obtain the vibration frequency of the vibrating wire sensor; The phase compensation unit is configured to calculate the phase delay between the excitation signal and the oscillation signal of the vibrating wire sensor by adopting a phase self-adaptive compensation algorithm according to the vibration frequency, determine the sending time of the next period excitation pulse through the phase delay, and generate an excitation digital signal with the same frequency and the same phase according to the vibration frequency when the detection time reaches the sending time; and the excitation control unit is configured to control the working time sequence of the frequency measurement unit and the phase compensation unit.
8. The vibrating wire sensor in-phase feedback excitation system of claim 3, wherein the power amplification filter module comprises an LC low frequency filter.

Description

In-phase feedback excitation method and system for vibrating wire sensor Technical Field The invention relates to the technical field of measurement by adopting electricity or magnetism, in particular to an in-phase feedback excitation method and system of a vibrating wire sensor. Background The vibrating wire sensor is a resonant sensor with a tensioned metal wire as a sensing element. After the length of the string is determined, the change of the natural vibration frequency of the string can be used for representing the tension of the string, and an electric signal which has a certain relation with the tension can be obtained through a corresponding measuring circuit. With the development of the structure monitoring technology, the vibration wire sensor acquisition is gradually developed from static acquisition to dynamic acquisition. Patent application publication No. CN106802161A discloses an excitation method of a vibrating wire sensor, and specifically discloses that an optimal excitation method is selected from a plurality of high-voltage pulse excitation methods and a plurality of low-voltage pulse excitation methods according to the excitation voltage condition for measurement. However, in this technical solution, a filter amplifier is provided to amplify and filter the vibration signal of the collected vibrating wire sensor, and a low frequency scanning circuit is provided to output excitation. And the introduction of the filter amplifier and the low-frequency scanning circuit can cause a larger phase delay of the finally read vibration signal. When the phase delay is in a certain interval, the generated excitation voltage can cause the vibration amplitude generated by the vibrating wire sensor to be gradually reduced, and finally the vibrating wire sensor is caused to stop oscillating. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides an in-phase feedback excitation method and system for a vibrating wire sensor, which can eliminate the direct phase difference between an excitation signal and a sensor oscillation signal and avoid the weakening of the oscillation amplitude of the vibrating wire sensor. The specific technical scheme is as follows: In a first aspect, there is provided a method for in-phase feedback excitation of a vibrating wire sensor, in a first implementation manner of the first aspect, the method includes: acquiring a voltage signal fed back by the vibrating wire sensor under the action of an excitation pulse in the previous period, and measuring the voltage signal to obtain the vibration frequency of an oscillating signal generated by the vibrating wire sensor; Calculating phase delay between an excitation signal and an oscillation signal of the vibrating wire sensor by adopting a phase self-adaptive compensation algorithm according to the vibration frequency, and determining the excitation pulse sending moment of the next period through the phase delay; When the detection time reaches the sending time of the excitation pulse, the vibration wire sensor is excited by the excitation signal with the same frequency and phase according to the vibration frequency. With reference to the first implementation manner of the first aspect, in a second implementation manner of the first aspect, measuring the voltage signal includes: Filtering and amplifying the voltage signal fed back by the vibrating wire sensor to convert the voltage signal into a sine wave voltage signal with small harmonic wave; Shaping the sine wave voltage signal into a rectangular wave signal with the same frequency and the same amplitude; And carrying out frequency measurement on the rectangular wave signal to obtain the vibration frequency. With reference to the first implementation manner of the first aspect, in a third implementation manner of the first aspect, the phase adaptive compensation algorithm includes: Adopting a corresponding phase delay function, and respectively calculating the phase delay corresponding to the circuit units applied to each link in the excitation process according to the vibration frequency; and calculating the phase delay between the excitation signal and the oscillation signal by combining the phase delays corresponding to the circuit modules. With reference to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the circuit unit includes a filtering and amplifying unit for filtering and amplifying the voltage signal, and a smoothing filtering unit for smoothing and filtering the excitation signal. With reference to the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the filtering and amplifying module is a second-order butterworth filter. In a second aspect, there is provided an in-phase feedback excitation system of a vibrating wire sensor, in a first possible implementation of the second aspect, comprising: The frequency meas