CN115600046A - Fluid flow estimation method and device - Google Patents
Fluid flow estimation method and device Download PDFInfo
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- CN115600046A CN115600046A CN202211523693.3A CN202211523693A CN115600046A CN 115600046 A CN115600046 A CN 115600046A CN 202211523693 A CN202211523693 A CN 202211523693A CN 115600046 A CN115600046 A CN 115600046A
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- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
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- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The application provides a method and a device for estimating the flow of fluid, wherein the method comprises the following steps: acquiring a characteristic curve of the fluid pump, wherein the characteristic curve is a relation curve of current and pumping flow of the fluid pump running in a first fluid at a target rotating speed; calculating the flow to be corrected corresponding to the target current according to the characteristic curve, wherein the target current is any current when the fluid pump runs in the target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid; acquiring a target compensation weight, wherein the target compensation weight is the flow weight of a target current at a target rotating speed; and estimating a target flow according to the flow to be corrected and the target compensation weight, wherein the target flow is a pumping flow of the fluid pump in the target fluid and operated at a target current. The method and the device estimate the pumping flow of the fluid in the target fluid by measuring the characteristic curve of the fluid pump in the first fluid, and can improve the safety of the fluid pump while effectively improving the accuracy of estimating the pumping flow of the fluid pump.
Description
Technical Field
The present disclosure relates to the field of fluid measurement technologies, and in particular, to a method and an apparatus for estimating a flow rate of a fluid.
Background
A fluid pump is a device used to assist in pumping a fluid, such as a gas, liquid or slurry, either partially or fully. The flow of fluid through the fluid pump needs to be measured while the fluid pump is pumping to provide data to a user or operator who can obtain the status of the fluid pump operation and/or fluid pump auxiliary objects by analyzing the data. However, the flow rate of the fluid pumped by the fluid pump cannot be directly measured in the operation process of the fluid pump, and parameters of each fluid pump may be different due to manufacturing processes, materials, assembly and the like, such as different friction coefficients, different field currents and different sizes of impellers. The difference of these parameters may cause the pumping flow rate of each fluid pump to change, and therefore how to effectively and accurately estimate the pumping flow rate of the fluid pump is in need of solution.
Disclosure of Invention
The embodiment of the application provides a fluid flow estimation method and device, which can improve the accuracy of the fluid flow pumped by a fluid pump and better reflect the running state of the fluid pump.
In a first aspect, an embodiment of the present application provides a method for estimating a flow rate of a fluid, where the method includes:
acquiring a characteristic curve of a fluid pump, wherein the characteristic curve is a relation curve of current and pumping flow of the fluid pump running in a first fluid at a target rotating speed;
calculating the flow to be corrected corresponding to target current according to the characteristic curve, wherein the target current is any current of the fluid pump when the fluid pump runs in target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid;
acquiring a target compensation weight, wherein the target compensation weight is the flow weight of the target current at the target rotating speed;
and estimating a target flow according to the flow to be corrected and the target compensation weight, wherein the target flow is a pumping flow of the fluid pump in the target fluid and operated at the target current.
In a second aspect, an embodiment of the present application provides a device for estimating a flow rate of a fluid, the device including an obtaining unit, a calculating unit, and an estimating unit, wherein,
the acquiring unit is used for acquiring a characteristic curve of the fluid pump, wherein the characteristic curve is a relation curve of current and pumping flow of the fluid pump running in a first fluid at a target rotating speed;
the calculation unit is used for calculating the flow to be corrected corresponding to a target current according to the characteristic curve, the target current is any current when the fluid pump runs in a target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid;
the obtaining unit is further configured to obtain a target compensation weight, where the target compensation weight is a flow weight of the target current at the target rotation speed;
the estimation unit is configured to estimate a target flow rate according to the flow rate to be corrected and the target compensation weight, where the target flow rate is a pumping flow rate of the fluid pump in the target fluid, and the pumping flow rate is operated at the target current.
In a third aspect, embodiments of the present application provide a computer device, which includes a processor, a memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor, the programs including instructions for performing some or all of the steps described in the method of the first aspect.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program for electronic data exchange, where the computer program makes a computer perform some or all of the steps described in the method of the first aspect.
In a fifth aspect, embodiments of the present application provide a computer program product, where the computer program product includes a non-transitory computer-readable storage medium storing a computer program, where the computer program is operable to cause a computer to perform some or all of the steps described in the method according to the first aspect of the embodiments of the present application. The computer program product may be a software installation package.
By implementing the embodiment of the application, a characteristic curve of the fluid pump is obtained, wherein the characteristic curve is a relation curve of current and pumping flow of the fluid pump in a first fluid and running at a target rotating speed; calculating the flow to be corrected corresponding to the target current according to the characteristic curve, wherein the target current is any current when the fluid pump runs in the target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid; acquiring a target compensation weight, wherein the target compensation weight is the flow weight of a target current at a target rotating speed; and estimating a target flow according to the flow to be corrected and the target compensation weight, wherein the target flow is a pumping flow of the fluid pump in the target fluid and operated at a target current. The method and the device estimate the pumping flow of the fluid in the target fluid by measuring the characteristic curve of the fluid pump in the first fluid, and can improve the safety of the fluid pump while effectively improving the accuracy of estimating the pumping flow of the fluid pump.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a test system according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a method for estimating a flow rate of a fluid according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating characteristic curves of the present application in different rotation speed ranges;
FIG. 4 is a block diagram illustrating functional units of a device for estimating a flow rate of a fluid according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application are described below clearly and completely in combination with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step on the basis of the description of the embodiments of the present application belong to the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the foregoing drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, software, product, or apparatus that comprises a list of steps or elements is not limited to those listed but may include other steps or elements not listed or inherent to such process, method, product, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Before describing the technical solutions of the embodiments of the present application, the following describes related concepts, test systems, and the like that may be involved in the present application.
Referring to fig. 1, fig. 1 is a testing system according to an embodiment of the present disclosure, which includes a simulation circulation system, a fluid pump, a control cabinet/Data Acquisition (DAQ) system, and an upper computer. The simulation circulation system is used for testing the performance of the fluid pump and mainly simulates the environment of the fluid pump for pumping fluid. The control cabinet/DAQ system is used for quantizing analog signals acquired by acquisition devices such as a flowmeter, a pressure sensor, a temperature sensor and the like arranged in the analog circulating system into digital signals and sending the digital signals to an upper computer for displaying, analyzing and storing. The upper computer may include various computer devices (e.g., mobile phone, tablet computer, desktop computer, etc.) with wired or wireless communication functions, a computing device or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), mobile Station (MS), terminal equipment (terminal device), etc. For convenience of description, the above-mentioned apparatuses are collectively referred to as computer apparatuses.
In the testing process, the fluid pump is placed into a testing system to operate, and the operating performance of the fluid pump is obtained by analyzing data acquired by the control cabinet/data acquisition system. In particular, during the operation of the fluid pump and the simulation circulation system, the pumping flow rate of the fluid pump at the set current can be collected through a flow meter arranged in the simulation circulation system.
The fluid pump referred to in this application may be a blood pump in medical equipment, a water pump used in industry, a slurry delivery pump, a plunger pump in instrument equipment, etc., and the present application does not limit this.
By "current" in this application is meant the current in the fluid pump that drives the motor or electric machine, which current is related to the power of the motor at a constant supply voltage. "rotational speed" refers to the rotational speed of a motor or electric machine, which is associated with the rotational speed of the rotor or impeller of a fluid pump, and may be defined as revolutions per minute. "flow rate", "fluid flow rate", "pumped flow rate" refer to the volume of fluid delivered through a fluid pump per unit of time, which can be measured in liters per minute estimates.
Data measured by the test system, such as "baseline data," "flow data," and "data pairs," refer to measurements taken by the test system simulating the operating environment of the fluid pump. In order to ensure the performance and safety of the fluid pump, the fluid pump cannot be placed in a target fluid in advance for testing to obtain the performance parameters or coefficients thereof, but in order to improve the accuracy of flow estimation of the fluid pump, a plurality of fluid pumps of the same type can be placed in a testing system in advance for measuring the performance thereof, and the performance parameters or coefficients of the fluid pumps can be analyzed under the condition of meeting the preset accuracy, so that when the fluid pump is estimated to run in the target fluid, the flow of the fluid pump can be estimated by acquiring data obtained in the testing system before (for example, stored in a controller for controlling the fluid pump in a mode of searching a mapping table, a lookup table or an icon).
In conjunction with the above description, the present application is described below from the perspective of method examples.
Referring to fig. 2, fig. 2 is a schematic flow chart of a fluid flow rate estimation method according to an embodiment of the present disclosure, the method including the following steps.
S210, obtaining a characteristic curve of the fluid pump, wherein the characteristic curve is a relation curve of current and pumping flow of the fluid pump in the first fluid when the fluid pump runs at a target rotating speed.
The fluid pump delivers fluid to a desired location by rotation of an impeller disposed therein, the rotation of the impeller being driven by rotation of a motor. At a given impeller speed or motor speed, the fluid flow through the fluid pump is dependent upon the pressure differential that the fluid pump is required to overcome. The relationship between the pumping flow rate of the fluid and the current of the motor or electric machine of the fluid pump is monotonic for the range of currents in which the fluid pump can operate, and thus the relationship between current-flow rate can be used to determine a flow rate estimate of the fluid. However, after each fluid pump is manufactured, various parameters of each fluid pump, such as pump parameters and/or motor parameters, may have certain differences, and the various parameters may affect the relationship between the current of the motor and the pumping flow rate of the fluid pump, such as the friction loss of the impeller, the friction coefficient of the driving shaft, the position where the fluid pump is placed, and the like; and unknown losses may also occur during the process of placing the fluid pump in a working environment. When the fluid pump is operated in the working environment, the pumping flow rate of the fluid corresponding to the current cannot be reliably determined based on the given motor speed.
The fluid pump may be a disposable device or in order to ensure performance and safety of the fluid pump, a characteristic curve in a target fluid cannot be measured in a test system in advance, and therefore, in order to accurately estimate a pumping flow rate of the fluid, the present application obtains the characteristic curve of the fluid pump measured in a first fluid in advance during operation of the fluid pump, so as to estimate a pumping flow rate corresponding to a current when the fluid pump operates in the target fluid according to the characteristic curve. The first fluid may be a liquid or a gas, such as pure water, that does not affect the fluid pump.
For example, the obtaining a characteristic curve of the fluid pump includes: acquiring a first reference data set, wherein the first reference data set is data generated by the operation of the fluid pump in a test system in which the first fluid is placed, the first reference data set comprises multiple groups of first data, and the first data comprises current and pumping flow corresponding to the current; classifying the first reference data set according to the rotating speed of the fluid pump to obtain n second reference data sets, wherein each second reference data set corresponds to a rotating speed range, and n is a positive integer; mapping the first data in each of the n second reference data sets in a coordinate system, the horizontal axis of the coordinate system being the pumping flow rate and the vertical axis being the current; fitting the coordinate points corresponding to each second reference data set to obtain n fitting curves, wherein each rotating speed range corresponds to one fitting curve; and determining the characteristic curve from the n fitting curves according to the target rotating speed.
After each fluid pump is manufactured, the fluid pump can be put into a test system configured as a first fluid, and a current-to-pumping flow rate relation curve of the fluid pump at each rotating speed, namely a characteristic curve of the first fluid at each rotating speed, is measured. And then storing the characteristic curve of each rotating speed into a control device for controlling the operation of the fluid pump, acquiring the current rotating speed when the fluid pump operates, so as to acquire the characteristic curve of the fluid pump in the first fluid at the current rotating speed, and estimating the pumping flow of the fluid pump in the target fluid at the current according to the characteristic curve.
Specifically, the fluid pump is placed in a test system configured as pure water, the fluid pump and the test system are operated, and pumping flow rates corresponding to different motor currents when the fluid pump is set at different rotating speeds are measured, that is, first reference data sets are acquired, wherein first data in each first reference data set comprise a set of (current, pumping flow rate) data. The first reference data set is then classified according to the rotational speed, and the first data in the same rotational speed range, which may be a rotational speed range corresponding to a rotational speed gear set by the fluid pump, is classified into a second reference data set. For example, the fluid pump has 9 speed steps, and each speed step interval is 400 rpm, namely the first speed step corresponds to a speed range of 2000 rpm-2400 rpm. And then mapping the first data in each second reference data set into a coordinate system, and performing curve fitting on coordinate points in the coordinate system to obtain a characteristic curve corresponding to each rotation speed range, as shown in fig. 3, where fig. 3 shows a relation curve between current and pumping flow in 9 rotation speed ranges, that is, a characteristic curve of the fluid pump in pure water.
And when the fluid pump runs in the target fluid, searching the characteristic curve corresponding to the current rotating speed from the stored characteristic curve graph according to the current rotating speed of the fluid pump.
And S220, calculating the flow to be corrected corresponding to a target current according to the characteristic curve, wherein the target current is any current when the fluid pump runs in a target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid.
In the present application, after the characteristic curve of the fluid pump operating at the target rotation speed under pure water is obtained, the functional relationship between the current and the pumped fluid of the fluid pump under pure water can be calculated according to the characteristic curve. According to the functional relation, the pumping flow corresponding to the current of the fluid pump currently running in the target fluid can be calculated. Since the viscosity of the target fluid is different from that of the pure water, the pumping flow rate in the target fluid can be estimated after the flow rate to be corrected calculated by the functional relationship is corrected.
The target fluid may be a fluid that the fluid pump needs to deliver in a real working environment, such as glucose solution, water-glycerol mixture, blood, mixed solution, solution in chemical industry, etc.
For example, the calculating the flow to be corrected corresponding to the target current according to the characteristic curve includes: determining a coefficient set corresponding to the characteristic curve according to the target rotating speed; and substituting the target current and the coefficient set into a first formula to calculate the flow to be corrected, wherein the first formula is a relational formula of the current and the pumping flow when the fluid pump runs at the target rotating speed in the first fluid.
Wherein the set of coefficients comprises a first coefficient, a second coefficient, and a third coefficient; the first formula is expressed as:
the above-mentioned
Is the first coefficient, the b is the second coefficient, the c is the third coefficient, a, b and c are all larger than 0 and smaller than 1, Q is the target flow, and I is the target current.
In the application, the first formula corresponding to the characteristic curve is a quadratic equation of a unit, and because the coefficients corresponding to the equations in each rotating speed range are different, the first coefficient, the second coefficient and the third coefficient can be calculated according to the characteristic curve of the target rotating speed; or searching a first coefficient, a second coefficient and a third coefficient corresponding to the target rotating speed from table data stored in advance. And substituting the first coefficient, the second coefficient, the third coefficient and the target current into a first formula to calculate the flow to be corrected of the target current when the fluid pump operates in the target fluid.
It should be noted that, after the characteristic curves of the fluid pump in each rotation speed range under pure water are obtained through measurement, the first coefficient, the second coefficient and the third coefficient of each characteristic curve can be directly calculated, and the first coefficient, the second coefficient and the third coefficient are stored in the control device, so that the fluid pump can be searched to estimate the pumping flow rate when in operation.
And S230, acquiring a target compensation weight, wherein the target compensation weight is the flow weight of the target current at the target rotating speed.
Since the viscosity of the target fluid is different from that of pure water, the viscosity of the fluid directly affects the pumping flow rate of the fluid pump. Therefore, after the flow to be corrected is calculated, the flow to be corrected can be corrected according to the viscosity difference between the target fluid and the pure water, and the estimated target flow is obtained.
In the present application, a target compensation weight of a flow rate of the fluid pump operating at a target rotational speed in a target fluid, which is stored in advance in the control device, may be obtained, and the target compensation weight may be a constant or a function, which is not limited in the present application. The greater the viscosity of the fluid, the greater the pressure difference that the fluid pump needs to overcome, so that the pumping flow of the fluid pump in a pure water environment is greater than the pumping flow in a target fluid environment under the condition of the same rotating speed and the same current. Therefore, the target compensation weight of the flow caused by the viscosity difference is subtracted from the flow to be corrected, and the pumping flow estimated under the target fluid is obtained.
For example, the obtaining the target compensation weight includes: respectively obtaining m first flow data sets and m second flow data sets corresponding to m rotating speeds, wherein each first flow data set comprises k first flows calculated according to the first formula and k first currents, each second flow data set comprises k second flows measured when the first flows run at the k first currents in a test system, the test system is provided with the target fluid, the m rotating speeds are all in a preset rotating speed range, and the m and the k are positive integers; calculating differences between the k first traffics in the first traffic data set and the k second traffics in the second traffic data set respectively to obtain m third traffic data sets, where each third traffic data set includes k differences; screening the m third flow data sets according to the accuracy to obtain m fourth flow data sets; respectively drawing m compensation curves of the m fourth flow data sets; and determining the target compensation weight according to the m compensation curves.
In order to obtain the target compensation weight of the fluid pump, a plurality of fluid pumps which are the same as the fluid pump can be respectively put into a test system configured as a first fluid and a target fluid, and the relation between the current of the fluid pump under the first fluid and the target fluid and the pumped fluid can be measured. The target compensation weight is then determined based on the difference in the pumped fluids at the first fluid and the target fluid.
Specifically, a plurality of fluid pumps of the same type as the fluid pump are respectively placed in a test system configured as a target fluid, pumping flow rates corresponding to different currents at different rotating speeds are measured, and a second flow rate data set corresponding to each rotating speed is obtained. And substituting different currents at different rotating speeds into corresponding first formulas respectively, and calculating a first flow data set corresponding to each rotating speed. And calculating the difference value of the first flow and the second flow corresponding to the same current in each of the first flow data set and the second flow data set to obtain m third flow data sets. Because the performance of the same fluid pump still has some differences, the third flow data sets are respectively screened, the difference value larger than the preset difference value in the third flow data sets is deleted, and the influence on flow estimation caused by the larger performance difference of the fluid pumps is eliminated. The preset difference value may be set according to the accuracy of the flow rate estimation, and is not limited herein.
In another example, the obtaining the target compensation weight comprises: respectively acquiring multiple groups of first data pairs and multiple groups of second data pairs corresponding to the target rotating speed, wherein the first data pairs comprise second currents and third flows, the third flows are pumping flows corresponding to the second currents when the first fluids run in a test system for placing the first fluids at the target rotating speed, the second data pairs comprise the second currents and fourth flows, and the fourth flows are pumping flow rates corresponding to the second currents when the fourth flows run in the test system for placing the target fluids at the target rotating speed; respectively drawing a first curve of the plurality of groups of first data pairs and a second curve of the plurality of groups of second data pairs; moving the second curve, and counting at least one intersection point of the first curve and the moved second curve, wherein each intersection point pair is represented as a moving value and a flow rate; calculating the target compensation weight according to the at least one intersection point.
Specifically, a plurality of the same type of fluid pumps are respectively put into a test system configured with a first fluid and a target fluid to operate at the same rotation speed, and a third flow rate in the first fluid and a fourth flow rate in the target fluid under the same current are tested. A first curve of a first data pair measured in the first fluid and a second curve of a second data pair measured in the target fluid are then plotted, respectively. And (3) moving the second curve up and down to enable each flow point of the second curve and the first curve to have an intersection point, and recording the pumping flow corresponding to the intersection point of the moved second curve and the first curve and the movement amount of the second curve in the process of moving the second curve. The movement amount reflects the influence of the viscosity of the fluid on the work of the blood pump under the condition that the fluid pump pumps the same flow, so that the target compensation weight is calculated through the at least one intersection point.
Illustratively, the shift value of each intersection is substituted into the first formula
The method comprises the steps of obtaining at least one flow, then calculating the mean value and the mean square error of the at least one flow, determining an adjusting coefficient of a moving value according to the mapping relation between the mean square error and the adjusting coefficient, and further performing fluctuation adjustment on the mean value according to the adjusting coefficient to obtain target compensation weight.
In an example, at least one intersection point is mapped to a coordinate system to obtain a plurality of coordinate points, the plurality of coordinate points are fitted to obtain a curve, a flow-related function is calculated according to the curve, and the function is used as a target compensation weight.
And S240, estimating a target flow according to the flow to be corrected and the target compensation weight, wherein the target flow is a pumping flow of the fluid pump in the target fluid and operated at the target current.
Optionally, the estimating a target flow according to the flow to be corrected and the target compensation weight includes: acquiring a flow estimation model according to the target compensation weight; and inputting the flow to be corrected and the target current into the flow estimation model, and outputting the target flow.
The present application may also estimate a target flow rate in a target fluid through a flow rate estimation model. Because the characteristic curves of the fluid pump in different rotating speed ranges are different, and the flow compensation weight of the fluid pump is also a function associated with the rotating speed range, the parameters of the flow estimation model in the rotating speed range to which the current rotating speed belongs can be determined according to the target compensation weight.
The training method of the flow estimation model comprises the following steps: obtaining a training set group, wherein the training set group comprises a plurality of training sets, each training set corresponds to a rotating speed range, the training sets comprise a plurality of manually marked first data, and the first data comprise rotating speed, first test fluid, second test fluid, current and pumping flow; and training the flow estimation model to be trained through each training set to obtain a plurality of flow estimation models, wherein each flow estimation model corresponds to a rotating speed range.
In practical application, a plurality of fluid pumps of the same type are respectively put into a testing system configured with first testing fluid and second testing fluid with different viscosities to operate at the same rotating speed, currents of the fluid pumps in the first testing fluid and the second testing fluid obtained through testing and pumping flows corresponding to the currents are used as first data in a training set, and the first data are respectively marked with flow compensation weights at the rotating speed.
The flow estimation model to be trained may be a machine learning algorithm for classification, such as a K _ means algorithm, a K Nearest Neighbor (KNN, K-Nearest Neighbor) classification algorithm, a decision tree, or a Neural Network algorithm, such as a Recurrent Neural Network (RNN), a Convolutional Neural Network (CNN), a Long Short Term Memory Network (Long Short-Term Memory, LSTM), and various variable Neural Network algorithms.
Further, the obtained multiple training sets are respectively and sequentially input to a flow estimation model to be trained, and output flow compensation weight is obtained. And then comparing the output flow compensation weight with the marked flow compensation weight to construct a loss function of the flow estimation model to be trained. And updating parameters of a flow estimation model to be trained according to the loss function, and taking the flow estimation model when the convergence value of the loss function meets the preset precision requirement as the trained flow estimation model. Illustratively, the parameter corresponding to the minimum value of the loss function being smaller than the precision value is determined as the parameter of the flow estimation model.
The method comprises the steps of obtaining a characteristic curve of a fluid pump, wherein the characteristic curve is a relation curve of current and pumping flow of the fluid pump in a first fluid at a target rotating speed; calculating the flow to be corrected corresponding to the target current according to the characteristic curve, wherein the target current is any current when the fluid pump runs in the target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid; acquiring a target compensation weight, wherein the target compensation weight is the flow weight of a target current at a target rotating speed; and estimating a target flow according to the flow to be corrected and the target compensation weight, wherein the target flow is a pumping flow of the fluid pump in the target fluid and operated at a target current. According to the method and the device, the pumping flow of the fluid pump in the target fluid is estimated by measuring the characteristic curve of the fluid pump in the first fluid, so that the accuracy of the estimation of the pumping flow of the fluid pump can be effectively improved, and the safety of the fluid pump can be improved.
The above description has introduced the solution of the embodiment of the present application mainly from the perspective of the method-side implementation process. It is understood that the network device comprises corresponding hardware structures and/or software modules for performing the respective functions in order to realize the above functions. Those of skill in the art will readily appreciate that the present application is capable of hardware or a combination of hardware and computer software implementing the various illustrative elements and algorithm steps described in connection with the embodiments provided herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
Referring to fig. 4, fig. 4 is a block diagram illustrating functional units of an apparatus 400 for estimating a fluid flow rate according to an embodiment of the present application, where the apparatus 400 includes: an acquisition unit 410, a calculation unit 420 and an estimation unit 430.
The obtaining unit 410 is configured to obtain a characteristic curve of the fluid pump, where the characteristic curve is a relation curve between a current and a pumping flow rate of the fluid pump in the first fluid at a target rotation speed;
the calculating unit 420 is configured to calculate a flow to be corrected corresponding to a target current according to the characteristic curve, where the target current is any current of the fluid pump when the fluid pump operates at the target rotation speed in a target fluid, and a fluid density of the target fluid is greater than a fluid density of the first fluid;
the obtaining unit 410 is further configured to obtain a target compensation weight, where the target compensation weight is a flow weight of the target current at the target rotation speed;
the estimating unit 430 is configured to estimate a target flow rate according to the flow rate to be corrected and the target compensation weight, where the target flow rate is a pumping flow rate of the fluid pump in the target fluid, and the pumping flow rate is operated at the target current.
For example, in terms of calculating the flow to be corrected corresponding to the target current according to the characteristic curve, the calculating unit 420 is specifically configured to: determining a coefficient set corresponding to the characteristic curve according to the target rotating speed; substituting the target current and the coefficient set into a first formula to calculate the flow to be corrected, wherein the first formula is a relational formula of the current and the pumping flow when the fluid pump runs in the first fluid at the target rotating speed.
Illustratively, the set of coefficients includes a first coefficient, a second coefficient, and a third coefficient; the first formula is expressed as:
said
Is the first coefficient, the b is the second coefficient, the c is the third coefficient, a, b and c are all larger than 0 and smaller than 1, Q is the target flow, and I is the target current.
For example, in terms of obtaining the target compensation weight, the estimating unit 430 is specifically configured to: respectively obtaining m first flow data sets and m second flow data sets corresponding to m rotating speeds, wherein each first flow data set comprises k first flows calculated according to the first formula and k first currents, each second flow data set comprises k second flows measured when the first flows run at the k first currents in a test system, the test system is provided with the target fluid, the m rotating speeds are all in a preset rotating speed range, and the m and the k are positive integers; calculating difference values of the k first flows in the first flow data sets and the k second flows in the second flow data sets respectively to obtain m third flow data sets, wherein the third flow data sets comprise k difference values; screening the m third flow data sets according to the accuracy to obtain m fourth flow data sets; respectively drawing m compensation curves of the m fourth flow data sets; and determining the target compensation weight according to the m compensation curves.
For example, in terms of obtaining the target compensation weight, the estimating unit 430 is specifically configured to: respectively acquiring multiple groups of first data pairs and multiple groups of second data pairs corresponding to the target rotating speed, wherein the first data pairs comprise second currents and third flows, the third flows are pumping flows corresponding to the second currents when the first fluids run in a test system for placing the first fluids at the target rotating speed, the second data pairs comprise the second currents and fourth flows, and the fourth flows are pumping flow rates corresponding to the second currents when the fourth flows run in the test system for placing the target fluids at the target rotating speed; respectively drawing a first curve of the multiple groups of first data pairs and a second curve of the multiple groups of second data pairs; moving the second curve, and counting at least one intersection point of the first curve and the moved second curve, wherein each intersection point pair is represented as a moving value and a flow rate; calculating the target compensation weight according to the at least one intersection point.
Illustratively, in obtaining the characteristic curve of the fluid pump, the obtaining unit 410 is specifically configured to: acquiring a first reference data set, wherein the first reference data set is data generated by the operation of the fluid pump in a test system, the test system is used for placing the first fluid, the first reference data set comprises multiple groups of first data, and the first data comprises current and pumping flow corresponding to the current; classifying the first reference data set according to the rotating speed of the fluid pump to obtain n second reference data sets, wherein each second reference data set corresponds to a rotating speed range, and n is a positive integer; mapping the first data in each of the n second reference data sets in a coordinate system, wherein the horizontal axis of the coordinate system is the pumping flow rate, and the vertical axis of the coordinate system is the current; fitting the coordinate points corresponding to each second reference data set to obtain n fitting curves, wherein each rotating speed range corresponds to one fitting curve; and determining the characteristic curve from the n fitting curves according to the target rotating speed.
For example, in terms of estimating the target flow rate according to the flow rate to be corrected and the target compensation weight, the estimating unit 430 is specifically configured to: acquiring a flow estimation model according to the target compensation weight; and inputting the flow to be corrected and the target current into the flow estimation model, and outputting the target flow.
It should be appreciated that the apparatus 400 herein is embodied in the form of a functional unit. The term "unit" herein may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an alternative example, it may be understood by those skilled in the art that the apparatus 400 may be embodied as a computer device in the foregoing embodiment, and the apparatus 400 may be configured to perform each process and/or step corresponding to the computer device in the foregoing method embodiment, which is not described herein again to avoid repetition.
The apparatus 400 of the above aspects has functions of implementing corresponding steps executed by a computer device in the above method; the functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software comprises one or more modules corresponding to the functions; for example, the obtaining unit 410 may be replaced by a receiver, and the calculating unit 420 and the estimating unit 430 may be replaced by a processor, which respectively perform transceiving operations and related processing operations in the respective method embodiments.
In an embodiment of the present application, the apparatus 400 may also be a chip or a chip system, for example: system on chip (SoC). Correspondingly, the computing unit may be a processing circuit of the chip, and is not limited herein.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a computer device according to an embodiment of the present application, where the computer device includes: one or more processors, one or more memories, one or more communication interfaces, and one or more programs; the one or more programs are stored in the memory and configured to be executed by the one or more processors.
The program includes instructions for performing the steps of:
acquiring a characteristic curve of a fluid pump, wherein the characteristic curve is a relation curve of current and pumping flow of the fluid pump running in a first fluid at a target rotating speed;
calculating the flow to be corrected corresponding to target current according to the characteristic curve, wherein the target current is any current of the fluid pump when the fluid pump runs in target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid;
acquiring a target compensation weight, wherein the target compensation weight is the flow weight of the target current at the target rotating speed;
and estimating a target flow according to the flow to be corrected and the target compensation weight, wherein the target flow is a pumping flow of the fluid pump in the target fluid and operated at the target current.
All relevant contents of each scene related to the method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
It will be appreciated that the memory described above may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information.
In the embodiment of the present application, the processor of the above apparatus may be a Central Processing Unit (CPU), and the processor may also be other general processors, digital Signal Processors (DSP), application Specific Integrated Circuits (ASIC), field Programmable Gate Arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It should be understood that reference to "at least one" in the embodiments of this application means one or more, and "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing between a plurality of objects, and do not limit the sequence, timing, priority or importance of the plurality of objects. For example, the first information and the second information are different information only for distinguishing them from each other, and do not indicate a difference in the contents, priority, transmission order, importance, or the like of the two kinds of information.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software elements in a processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are well known in the art. The storage medium is located in a memory, and a processor executes instructions in the memory, in combination with hardware thereof, to perform the steps of the above-described method. To avoid repetition, it is not described in detail here.
Embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any one of the methods as described in the above method embodiments.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any one of the methods as set out in the above method embodiments. The computer program product may be a software installation package.
It should be noted that for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art will recognize that the embodiments described in this specification are preferred embodiments and that acts or modules referred to are not necessarily required for this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or units, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit may be stored in a computer readable memory if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be substantially or partially contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, or a TRP, etc.) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash disk, ROM, RAM, magnetic or optical disk, and the like.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A method of flow estimation of a fluid, the method comprising:
acquiring a characteristic curve of a fluid pump, wherein the characteristic curve is a relation curve of current and pumping flow of the fluid pump in a first fluid at a target rotating speed;
calculating the flow to be corrected corresponding to target current according to the characteristic curve, wherein the target current is any current of the fluid pump when the fluid pump runs in target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid;
acquiring a target compensation weight, wherein the target compensation weight is the flow weight of the target current at the target rotating speed;
and estimating a target flow according to the flow to be corrected and the target compensation weight, wherein the target flow is a pumping flow of the fluid pump in the target fluid and operated at the target current.
2. The method according to claim 1, wherein the calculating the flow to be corrected corresponding to the target current according to the characteristic curve comprises:
determining a coefficient set corresponding to the characteristic curve according to the target rotating speed, wherein the coefficient set comprises a first coefficient, a second coefficient and a third coefficient;
substituting the target current and the coefficient set into a first formula to calculate the flow to be corrected, wherein the first formula is a relational formula of the current and the pumping flow when the fluid pump runs in the first fluid at the target rotating speed.
3. The method of claim 2, wherein the first formula is represented as:
the above-mentioned
The first coefficient, the second coefficient and the third coefficient, wherein a, b and c are all larger than 0 and smaller than 1, Q is the target flow, and I is the target current.
4. The method according to any one of claims 1-3, wherein the obtaining the target compensation weight comprises:
respectively obtaining m first flow data sets and m second flow data sets corresponding to m rotating speeds, wherein each first flow data set comprises k first flows calculated according to the first formula and k first currents, each second flow data set comprises k second flows measured when the test system runs at the k first currents, the target fluid is placed in the test system, the m rotating speeds are within a preset rotating speed range, and the m and the k are positive integers;
calculating difference values of the k first flows in the first flow data sets and the k second flows in the second flow data sets respectively to obtain m third flow data sets, wherein the third flow data sets comprise k difference values;
screening the m third flow data sets according to the accuracy to obtain m fourth flow data sets;
respectively drawing m compensation curves of the m fourth flow data sets;
and determining the target compensation weight according to the m compensation curves.
5. The method according to any one of claims 1-3, wherein the obtaining the target compensation weight comprises:
respectively acquiring multiple groups of first data pairs and multiple groups of second data pairs corresponding to the target rotating speed, wherein the first data pairs comprise second currents and third flows, the third flows are pumping flows corresponding to the second currents when the first fluids run in a test system for placing the first fluids at the target rotating speed, the second data pairs comprise the second currents and fourth flows, and the fourth flows are pumping flow rates corresponding to the second currents when the fourth flows run in the test system for placing the target fluids at the target rotating speed;
drawing a first curve of the plurality of first data pairs and a second curve of the plurality of second data pairs;
moving the second curve, and counting at least one intersection point of the first curve and the moved second curve, wherein each intersection point is represented as a moving value and a flow;
calculating the target compensation weight according to the at least one intersection point.
6. The method of claim 1, wherein the obtaining a characteristic curve of a fluid pump comprises:
acquiring a first reference data set, wherein the first reference data set is data generated by the operation of the fluid pump in a test system, the test system is used for placing the first fluid, the first reference data set comprises multiple groups of first data, and the first data comprises current and pumping flow corresponding to the current;
classifying the first reference data set according to the rotating speed of the fluid pump to obtain n second reference data sets, wherein each second reference data set corresponds to a rotating speed range, and n is a positive integer;
mapping the first data of each of the n second reference data sets in a coordinate system having the horizontal axis of the coordinate system as the pumping flow rate and the vertical axis as the current;
fitting the coordinate points corresponding to each second reference data set to obtain n fitting curves, wherein each rotating speed range corresponds to one fitting curve;
and determining the characteristic curve from the n fitting curves according to the target rotating speed.
7. The method according to claim 1, wherein estimating a target flow rate based on the flow rate to be corrected and the target compensation weight comprises:
acquiring a flow estimation model according to the target compensation weight;
and inputting the flow to be corrected and the target current into the flow estimation model, and outputting the target flow.
8. An apparatus for flow estimation of a fluid, the apparatus comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a characteristic curve of the fluid pump, and the characteristic curve is a relation curve of current and pumping flow of the fluid pump running in a first fluid at a target rotating speed;
the calculation unit is used for calculating the flow to be corrected corresponding to a target current according to the characteristic curve, wherein the target current is any current when the fluid pump runs in a target fluid at the target rotating speed, and the fluid density of the target fluid is greater than that of the first fluid;
the obtaining unit is further configured to obtain a target compensation weight, where the target compensation weight is a flow weight of the target current at the target rotation speed;
and the estimation unit is used for estimating a target flow according to the flow to be corrected and the target compensation weight, wherein the target flow is a pumping flow of the fluid pump in the target fluid and operated at the target current.
9. A computer device, characterized in that the computer device comprises a processor, a memory and a communication interface, the memory storing one or more programs, and the one or more programs being executed by the processor, the one or more programs comprising instructions for performing the steps in the method according to any of claims 1-7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program causes a computer to perform the steps of the method according to any one of claims 1-7.
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