CN114942050A - Vibration control method for Coriolis mass flowmeter - Google Patents

Abstract

The invention discloses a vibration control method for a Coriolis mass flowmeter. By modeling a measuring tube of a Coriolis mass flowmeter, an approximate frequency scanning range is determined, and the frequency determined in this way Compared with the frequency scanning range without data support, the frequency points of the scanning range are greatly reduced, and the more relevant data are obtained, the smaller the frequency scanning range is determined, so that the natural frequency of the measuring tube can be determined in a short time, and the vibration of the measuring tube is reduced. time needed.

Description

A Vibration Control Method for Coriolis Mass Flow Meters

technical field

The invention relates to the technical field of metering equipment, in particular to a vibration control method for a Coriolis mass flowmeter.

Background technique

A Coriolis mass flowmeter is a high-end metering device that determines the mass flow through a pipeline by measuring the Coriolis force with high accuracy and stability.

In the working process of the Coriolis mass flowmeter, the vibrator is first needed to control the vibration of the measuring tube. When the vibration frequency is the natural frequency of the measuring tube and its internal fluid, the measuring tube can reach the maximum amplitude. Therefore, it is very important to control the vibration of the measuring tube of the Coriolis mass flowmeter.

At present, the commonly used vibration control method of the measuring tube is to use the sweep frequency method, that is, the vibration frequency is sequentially loaded from low to high or from high to low within the preset vibration frequency range, and the natural frequency is determined by measuring the vibration amplitude of the measuring tube. Although this method can accurately obtain the natural frequency of the measuring tube, it takes a long time to obtain the natural frequency, and it is impossible to start the vibration quickly.

SUMMARY OF THE INVENTION

The embodiment of the present invention provides a vibration control method for a Coriolis mass flowmeter, so as to solve the problem that it takes a relatively long time to obtain the natural frequency of a measuring tube in the prior art.

In one aspect, an embodiment of the present invention provides a vibration control method for a Coriolis mass flowmeter, including:

Obtain the relevant data of the measuring tube of the Coriolis mass flowmeter;

Establish the model of the measuring tube according to the relevant data, and determine the frequency scanning range of the measuring tube according to the model;

Control the vibration frequency of the measuring tube within the frequency sweep range, and measure the vibration amplitude of the measuring tube at each vibration frequency;

Determine the vibration frequency of the measuring tube at the maximum vibration amplitude, and control the vibration of the measuring tube at this vibration frequency.

In a possible implementation manner, the acquisition of relevant data and the establishment of the model are completed by the mobile terminal. After the mobile terminal determines the frequency scanning range, the frequency scanning range is sent to the Coriolis mass flowmeter.

In a possible implementation manner, the mobile terminal sends the frequency scanning range to the Coriolis mass flowmeter through wireless communication technology.

In a possible implementation manner, the mobile terminal includes an input unit and a processing unit, the input unit is used for inputting relevant data in response to a user's operation, and the processing unit is used for establishing a model according to the relevant data inputted by the input unit, and determining a frequency scanning range.

In a possible implementation manner, the mobile terminal includes an image acquisition unit, an input unit and a processing unit, the image acquisition unit is used to acquire an image of the measuring tube, the processing unit is used to determine some relevant data according to the image, and the input unit is used to respond to the user The operation of inputting the remaining relevant data, the processing unit is also used to establish a model according to the relevant data, and determine the frequency scanning range.

In a possible implementation manner, after determining the frequency scanning range, the mobile terminal also determines the estimated natural frequency according to the model; after determining the actual natural frequency of the measuring tube, the Coriolis mass flowmeter sends the actual natural frequency to The mobile terminal compares the estimated natural frequency with the actual natural frequency, and corrects the frequency scanning range according to the comparison result.

In a possible implementation manner, the relevant data includes the length, radian, diameter, thickness, material and type of the medium passing through the measuring tube.

A vibration control method for a Coriolis mass flowmeter in the present invention has the following advantages:

By modeling the measuring tube, the approximate frequency sweep range is determined. Compared with the frequency sweep range without data support, the frequency sweep range determined in this way has greatly reduced frequency points. The smaller the scanning range, the natural frequency of the measuring tube can be determined in a short time, and the time required for the vibration of the measuring tube to be reduced.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of the composition of a vibration control system for a Coriolis mass flowmeter provided by an embodiment of the present invention;

FIG. 2 is a flowchart of a vibration control method for a Coriolis mass flowmeter according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1 is a schematic diagram of the composition of a vibration control system for a Coriolis mass flowmeter provided by an embodiment of the present invention, and FIG. 2 is a vibration control system for a Coriolis mass flowmeter provided by an embodiment of the present invention Flow chart of the control method. An embodiment of the present invention provides a vibration control method for a Coriolis mass flowmeter, the method comprising:

Obtain relevant data of the measuring tube 101 of the Coriolis mass flowmeter 100;

A model of the measuring tube 101 is established according to the relevant data, and the frequency scanning range of the measuring tube 101 is determined according to the model;

Control the vibration frequency of the measuring tube 101 within the frequency scanning range, and measure the vibration amplitude of the measuring tube 101 at each vibration frequency;

The vibration frequency of the measuring tube 101 at the maximum vibration amplitude is determined, and the vibration of the measuring tube 101 is controlled at the vibration frequency.

Exemplarily, the above-mentioned relevant data includes the length, radian, diameter, thickness, material, and type of the medium passing through the measuring tube 101, etc. Since the natural frequency of the measuring tube 101 is related to the above-mentioned relevant data, the more relevant data obtained, the more The more accurate, the more accurate the model will be, and the more accurate the frequency sweep range will be obtained. If any of the above related data cannot be obtained, the determined frequency scanning range is the frequency scanning range without data support, that is, the preset frequency scanning range. The vibration of the measuring tube 101 is controlled in sequence from high to low or from low to high, so it takes a lot of time. However, when more or even all relevant data are acquired, the determined frequency sweep range will be very small, so there are few frequency points included, and the measuring tube 101 can determine the natural frequency in a few vibrations, and start the vibration. It takes very little time.

In practical applications, the parameters of each type of Coriolis mass flowmeter 100 on sale can be obtained, so the measurement tube 101 of each Coriolis mass flowmeter 100 can be simulated in the laboratory to obtain Establish various physical data and natural frequency data under media type. However, the natural frequency in actual use may be different from the natural frequency simulated in the laboratory, so the natural frequency obtained in the laboratory needs to be expanded to form the above frequency sweep range.

In a possible embodiment, the acquisition of relevant data and the establishment of the model are completed by the mobile terminal 200 . After the mobile terminal 200 determines the frequency scanning range, the frequency scanning range is sent to the Coriolis mass flow meter 100 .

Exemplarily, the above-mentioned mobile terminal 200 may be an electronic device specially used for controlling the Coriolis mass flowmeter 100, or may be a general-purpose electronic device such as a mobile phone, a tablet computer, and the like. A dedicated application program is installed in the mobile terminal 200, and the application program can invoke functions such as processing and communication of the mobile terminal 200 to perform model establishment, frequency scanning range determination, and data communication. In the embodiment of the present invention, after determining the frequency scanning range, the mobile terminal 200 sends it to the Coriolis mass flow meter 100 by means of wireless communication. The adopted wireless communication methods may include Bluetooth and near field communication.

In a possible embodiment, the mobile terminal 200 includes an input unit and a processing unit, the input unit is used for inputting relevant data in response to a user's operation, and the processing unit is used for establishing a model according to the relevant data inputted by the input unit, and determining a frequency scanning range .

Exemplarily, when the relevant data is acquired by manual input, the user may input the relevant data through an input unit such as a mechanical keyboard, a touch keyboard, and voice input.

In a possible embodiment, the mobile terminal 200 includes an image acquisition unit, an input unit and a processing unit, the image acquisition unit is used for acquiring an image of the measuring tube 101, the processing unit is used for determining part of relevant data according to the image, and the input unit is used for In response to the user's operation to input the remaining relevant data, the processing unit is further configured to establish a model according to the relevant data, and determine the frequency scanning range.

Exemplarily, since the relevant data contains a lot of data, and many data cannot be obtained quickly and accurately by the user, the image acquisition unit can be used to acquire the image of the measuring tube 101, and then the image is processed by the processing unit to determine the part. Relevant data, such as the length and radian of the measuring tube 101, can be obtained according to the image processing result. For other relevant data, such as the diameter, thickness, material, and passing medium of the measuring tube 101, the user needs to observe the measuring tube 101 itself or the nameplate of the Coriolis mass flowmeter 100 to obtain, and input the data through the input unit. It is input into the mobile terminal 200 .

In a possible embodiment, after determining the frequency scanning range, the mobile terminal 200 further determines the estimated natural frequency according to the model; after determining the actual natural frequency of the measuring tube 101, the Coriolis mass flowmeter 100 will The frequency is sent to the mobile terminal 200, and the mobile terminal 200 compares the estimated natural frequency with the actual natural frequency, and corrects the frequency scanning range according to the comparison result.

Exemplarily, because the mobile terminal determines the estimated natural frequency according to the model, and expands on the basis of the estimated natural frequency, the above-mentioned frequency scanning range is obtained, but under the influence of the specific environment, the actual natural frequency of the measuring tube 101 is very high. There may be a certain deviation from the estimated natural frequency. In order to provide more accurate data in the subsequent modeling and frequency scanning range determination work, when the actual natural frequency of the measuring tube 101 is determined, the above estimated natural frequency can be corrected according to the actual natural frequency, and the model establishment process can be corrected. Some parameters in , make the difference between the estimated natural frequency determined according to the model and the actual natural frequency narrow, and improve the accuracy of subsequent vibration control operations.

Although preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (7)

1. A vibration control method for a coriolis mass flowmeter, comprising:

acquiring relevant data of a measuring pipe (101) of the Coriolis mass flowmeter (100);

establishing a model of the measuring tube (101) on the basis of the relevant data, determining a frequency sweep range of the measuring tube (101) on the basis of the model;

controlling the vibration frequency of the measuring tube (101) in the frequency sweep range and measuring the vibration amplitude of the measuring tube (101) at each vibration frequency;

the vibration frequency of the measuring tube (101) at maximum vibration amplitude is determined, at which the measuring tube (101) is controlled to vibrate.

2. The vibration control method for a coriolis mass flowmeter of claim 1, wherein said obtaining of said correlation data and said creating of said model are performed by a mobile terminal (200), and wherein said mobile terminal (200) determines said frequency sweep range and transmits said frequency sweep range to said coriolis mass flowmeter (100).

3. The vibration control method for a coriolis mass flow meter according to claim 2, characterized in that said mobile terminal (200) transmits said frequency sweep range to said coriolis mass flow meter (100) by wireless communication techniques.

4. The vibration control method for a coriolis mass flowmeter of claim 2, wherein said mobile terminal (200) comprises an input unit for inputting said correlation data in response to a user operation, and a processing unit for building said model based on said correlation data input by said input unit and determining said frequency sweep range.

5. The vibration control method for a coriolis mass flowmeter of claim 2, wherein said mobile terminal (200) comprises an image acquisition unit for acquiring an image of said measurement tube (101), an input unit for inputting a portion of said correlation data from said image, and a processing unit for inputting the remaining portion of said correlation data in response to a user operation, said processing unit further being configured to create said model from said correlation data and to determine said frequency sweep range.

6. The vibration control method for a coriolis mass flowmeter of claim 2 wherein said mobile terminal (200) further determines an estimated natural frequency based on said model after determining said frequency sweep range;

after determining the actual natural frequency of the measuring tube (101), the coriolis mass flowmeter (100) transmits the actual natural frequency to the mobile terminal (200), and the mobile terminal (200) compares the estimated natural frequency with the actual natural frequency and corrects the frequency sweep range according to the comparison result.

7. A vibration control method for a coriolis mass flowmeter according to claim 1 characterized in that said related data comprises the length, curvature, tube diameter, thickness, material and type of media passing through said measurement tube (101).

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