Pump efficiency correction calculation modeling method, calculation method, equipment, storage medium and product

Abstract

The invention discloses a pump efficiency correction calculation modeling method, a calculation method, equipment, a storage medium and a product, and the modeling method comprises the steps: building an electro-hydraulic proportioning pump efficiency correction calculation model based on a traditional hydraulic pump total efficiency theoretical calculation formula; experimental measurement values of the total efficiency of the electro-hydraulic proportioning pump under different flows are obtained; according to the experimental measurement value of the total efficiency of the electro-hydraulic proportioning pump under each flow, determining the specific value of each correction coefficient under each flow in the efficiency correction calculation model of the electro-hydraulic proportioning pump; obtaining a specific expression of each correction coefficient according to the specific value of each correction coefficient under each flow; and substituting the specific expression of each correction coefficient into the electro-hydraulic proportioning pump efficiency correction calculation model to obtain the electro-hydraulic proportioning pump efficiency correction calculation model. The problem that the error between the calculation result and the experiment result of the traditional hydraulic pump total efficiency theoretical calculation formula is large is effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electro-hydraulic proportional pumps, and in particular relates to a method for calculating and modeling the efficiency correction of an electro-hydraulic proportional pump, a calculation method, a device, a storage medium, and a product. Background Art

[0002] The existing theoretical calculation formula for the volumetric efficiency of an electro-hydraulic proportional pump is:

[0003]

[0004] Among them, η v represents the volumetric efficiency of the electro-hydraulic proportional pump, C s represents the liquid leakage coefficient, △P represents the inlet and outlet pressure difference of the electro-hydraulic proportional pump, μ represents the dynamic viscosity of the hydraulic oil, n represents the rotational speed of the electro-hydraulic proportional pump, β represents the displacement ratio, β = V t / V t max V t max represents the full displacement of the electro-hydraulic proportional pump, V t represents the actual displacement of the electro-hydraulic proportional pump.

[0005] The existing theoretical calculation formula for the mechanical efficiency of an electro-hydraulic proportional pump is:

[0006]

[0007] Among them, η c represents the mechanical efficiency of the electro-hydraulic proportional pump, C v represents the friction resistance coefficient of laminar flow, C f represents the friction resistance coefficient, T s represents the torque loss independent of parameters such as system pressure and rotational speed.

[0008] Therefore, the theoretical calculation formula for the total efficiency of the electro-hydraulic proportional pump is:

[0009]

[0010] Among them, η t represents the total efficiency of the electro-hydraulic proportional pump, and q represents the outlet flow rate of the electro-hydraulic proportional pump.

[0011] In order to verify the calculation error of the theoretical calculation formula for the total efficiency of the electro-hydraulic proportional pump, 12 experimental measurement values of the total efficiency were collected through experiments to calculate the absolute error of the theoretical calculation value, as shown in Table 1. It can be seen from Table 1 that the maximum absolute error of the theoretical calculation value of the total efficiency of the electro-hydraulic proportional pump reaches 23.22%, and the average absolute error is 13.74%.

[0012] The reason why the theoretical calculation formula for the overall efficiency of an electro-hydraulic proportional pump has a large error is that it is based on idealized assumptions, while there are complex influencing factors in actual working conditions. The theoretical calculation formula usually assumes that the hydraulic oil is incompressible and the flow is uniform, but factors such as the inevitable change in the viscosity of the hydraulic oil and the mixing of air in actual working conditions will reduce the efficiency. In addition, the fluctuations in the operating conditions of the electro-hydraulic proportional pump, the differences in manufacturing processes, heat energy losses, and flow resistance will also cause the actual efficiency to deviate from the theoretically calculated value.

[0013] To reduce the error, it is necessary to correct the theoretical calculation formula by combining experimental data and use a more complex efficiency calculation model. During the error analysis process, it is found that under different working conditions, the errors between the experimentally measured values and the theoretically calculated values of the overall efficiency of the electro-hydraulic proportional pump are different. This leads to the fact that if all the working condition data are corrected into a single theoretical calculation formula, the accuracy that the theoretical calculation formula can ultimately achieve is still at a relatively low level and difficult to meet the actual requirements.

[0014] Table 1 Comparison of Experimentally Measured Values and Theoretically Calculated Values of Electro-Hydraulic Proportional Pumps

[0015] Summary of the Invention

[0016] The purpose of the present invention is to provide a method, calculation method, device, storage medium, and product for correcting and calculating the pump efficiency model to solve the problem of large theoretical calculation errors in the overall efficiency of existing electro-hydraulic proportional pumps.

[0017] The present invention solves the above technical problems through the following technical solutions: An electro-hydraulic proportional pump efficiency correction calculation and modeling method, including:

[0018] Based on the theoretical calculation formula for the overall efficiency of traditional hydraulic pumps, construct an electro-hydraulic proportional pump efficiency correction calculation model;

[0019] Respectively obtain the experimentally measured values of the overall efficiency of the electro-hydraulic proportional pump at different flow rates;

[0020] According to the experimentally measured values of the overall efficiency of the electro-hydraulic proportional pump at each flow rate, determine the specific values of each correction coefficient at each flow rate in the electro-hydraulic proportional pump efficiency correction calculation model;

[0021] According to the specific values of each correction coefficient at each flow rate, obtain the specific expressions of each correction coefficient;

[0022] Substitute the specific expressions of each correction coefficient into the electro-hydraulic proportional pump efficiency correction calculation model to obtain the electro-hydraulic proportional pump efficiency correction calculation model.

[0023] Further, according to the experimental measurement values of the total efficiency of the electro-hydraulic proportional pump at various flow rates, the specific values of each correction coefficient in the efficiency correction calculation model of the electro-hydraulic proportional pump are determined using a non-linear regression model.

[0024] Further, the non-linear regression model is a polynomial regression model, an exponential regression model, or a machine learning model.

[0025] Further, the machine learning model is a support vector machine regression model.

[0026] Further, the specific expression of the efficiency correction calculation model of the electro-hydraulic proportional pump is:

[0027]

[0028] where η' t represents the efficiency correction calculation value of the electro-hydraulic proportional pump; q represents the outlet flow rate of the electro-hydraulic proportional pump; C s represents the liquid leakage coefficient; △P represents the pressure difference between the inlet and outlet of the electro-hydraulic proportional pump; μ represents the dynamic viscosity of the hydraulic oil; n represents the rotational speed of the electro-hydraulic proportional pump; V t max represents the full displacement of the electro-hydraulic proportional pump; C v represents the friction resistance coefficient along the streamline of laminar flow; C f represents the friction resistance coefficient; T s represents the torque loss independent of the system pressure and rotational speed; a0, a1, a2, a3, a4, a5, a6, a7, a8, a9 all represent correction coefficients.

[0029] Further, the specific expression of each correction coefficient is:

[0030]

[0031] where e represents the base of the natural logarithm.

[0032] Based on the same concept, the present invention also provides an efficiency correction calculation method for an electro-hydraulic proportional pump, including:

[0033] Invoking the efficiency correction calculation model of the electro-hydraulic proportional pump; wherein, the efficiency correction calculation model of the electro-hydraulic proportional pump is constructed using the above-mentioned electro-hydraulic proportional pump efficiency correction calculation modeling method;

[0034] Obtaining the outlet flow rate, rotational speed, pressure difference between the inlet and outlet, and full displacement of the electro-hydraulic proportional pump;

[0035] Calculating the efficiency correction calculation value of the electro-hydraulic proportional pump according to the efficiency correction calculation model of the electro-hydraulic proportional pump and the outlet flow rate, rotational speed, pressure difference between the inlet and outlet, and full displacement.

[0036] Based on the same inventive concept, the present invention further provides an electronic device, including a memory, a processor, and a computer program / instructions stored on the memory, and the processor executes the computer program / instructions to implement the electro-hydraulic proportional pump efficiency correction calculation modeling method or the electro-hydraulic proportional pump efficiency correction calculation method as described above.

[0037] Based on the same inventive concept, the present invention further provides a computer-readable storage medium, on which a computer program / instructions is stored, and when the computer program / instructions is executed by a processor, it implements the electro-hydraulic proportional pump efficiency correction calculation modeling method or the electro-hydraulic proportional pump efficiency correction calculation method as described above.

[0038] Based on the same inventive concept, the present invention further provides a computer program product, including a computer program / instructions, and when the computer program / instructions is executed by a processor, it implements the electro-hydraulic proportional pump efficiency correction calculation modeling method or the electro-hydraulic proportional pump efficiency correction calculation method as described above.

[0039] Advantageous Effects

[0040] Compared with the prior art, the advantages of the present invention are as follows:

[0041] The present invention constructs an electro-hydraulic proportional pump efficiency correction calculation model by correcting the theoretical calculation formula of the total efficiency of the electro-hydraulic proportional pump with a correction coefficient, greatly improving the calculation accuracy of the total efficiency of the electro-hydraulic proportional pump and effectively solving the problem of large calculation errors in the theoretical calculation formula of the total efficiency of traditional hydraulic pumps. Brief Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only one embodiment of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0043] Figure 1 It is a flowchart of the electro-hydraulic proportional pump efficiency correction calculation modeling method in the embodiment of the present invention. Detailed Embodiments

[0044] The technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] The technical solution of the present application will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0046] Embodiment 1

[0047] Figure 1 The flowchart of the electro-hydraulic proportional pump efficiency correction calculation modeling method provided by the present invention is shown. As Figure 1 shown, the modeling method includes the following steps:

[0048] Step A1: Based on the traditional hydraulic pump total efficiency theoretical calculation formula, construct an electro-hydraulic proportional pump efficiency correction calculation model.

[0049] In order to improve the accuracy of the electro-hydraulic proportional pump efficiency calculation, the traditional hydraulic pump total efficiency theoretical calculation formula (i.e., formula (3)) is corrected. In the specific implementation manner of the present invention, the correction is achieved by adding correction coefficients to each item of the traditional hydraulic pump total efficiency theoretical calculation formula. The specific expression of the electro-hydraulic proportional pump efficiency correction calculation model is:

[0050]

[0051] Among them, η' t represents the electro-hydraulic proportional pump efficiency correction calculation value; q represents the electro-hydraulic proportional pump outlet flow rate; C s represents the liquid leakage coefficient; △P represents the electro-hydraulic proportional pump inlet and outlet pressure difference; μ represents the dynamic viscosity of the hydraulic oil; n represents the electro-hydraulic proportional pump speed; V t max represents the pump full displacement; C v represents the laminar flow friction factor; C f represents the friction resistance coefficient; T s represents the torque loss independent of parameters such as system pressure and speed; a0, a1, a2, a3, a4, a5, a6, a7, a8, a9 all represent correction coefficients, and each correction coefficient is a function of the pump outlet flow rate q. In this embodiment, the liquid leakage coefficient C s , the laminar flow friction factor C v are respectively selected according to the recommended values in the "Mechanical Design Manual".

[0052] In another specific implementation manner of the present invention, the correction is achieved by adding correction coefficients to some items of the electro-hydraulic proportional pump total efficiency theoretical calculation formula. The specific expression of the electro-hydraulic proportional pump efficiency correction calculation model is:

[0053]

[0054] Step A2: Respectively obtain the experimental measurement values of the electro-hydraulic proportional pump total efficiency at different flow rates.

[0055] Measure the total efficiency of the electro-hydraulic proportional pump at different outlet flows through experiments.

[0056] Step A3: Determine the specific value of each correction coefficient at each flow rate according to the experimental measurement values of the total efficiency of the electro-hydraulic proportional pump at each flow rate, that is, obtain the specific value of each correction coefficient at different outlet flows of the pump (i.e., different pump outlet flows q).

[0057] In a specific embodiment of the present invention, according to the experimental measurement values of the total efficiency of the electro-hydraulic proportional pump at each pump outlet flow rate, a non-linear regression model is used to determine the specific values of each correction coefficient. That is, at each pump outlet flow rate, a set of correction coefficients that are closest to the experimental measurement value of the total efficiency of the pump is found through the non-linear regression model. Taking the efficiency correction calculation model of the electro-hydraulic proportional pump shown in formula (4) as an example, Table 2 shows the specific values of each correction coefficient at pump outlet flow rates of 7.5 L / min, 12.5 L / min, 17.5 L / min, 22.5 L / min, 27.5 L / min, 32.5 L / min, 37.5 L / min, 42.5 L / min, 47.5 L / min, 52.5 L / min, and 57.5 L / min. t The larger the number of pump outlet flow rates, the more accurate each correction coefficient is, but the calculation is also more complex. To balance the calculation accuracy and complexity, the embodiments of the present invention divide the flow working range into 11 intervals, and obtain the specific values of a0 at 11 different pump outlet flow rates, the specific values of a1 at 11 different pump outlet flow rates, the specific values of a2 at 11 different pump outlet flow rates, the specific values of a3 at 11 different pump outlet flow rates, the specific values of a4 at 11 different pump outlet flow rates, the specific values of a5 at 11 different pump outlet flow rates, the specific values of a6 at 11 different pump outlet flow rates, the specific values of a7 at 11 different pump outlet flow rates, the specific values of a8 at 11 different pump outlet flow rates, and the specific values of a9 at 11 different pump outlet flow rates. Each flow interval covers the entire flow range, ensuring smooth transitions between each flow interval and avoiding sudden changes in efficiency calculation caused by splicing of each flow interval.

[0058] Table 2 Specific values of each correction coefficient at different pump outlet flow rates

[0059]

[0060] The larger the number of pump outlet flow rates, the more accurate each correction coefficient is, but the calculation is also more complex. To balance the calculation accuracy and complexity, the embodiments of the present invention divide the flow working range into 11 intervals, and obtain the specific values of a0 at 11 different pump outlet flow rates, the specific values of a1 at 11 different pump outlet flow rates, the specific values of a2 at 11 different pump outlet flow rates, the specific values of a3 at 11 different pump outlet flow rates, the specific values of a4 at 11 different pump outlet flow rates, the specific values of a5 at 11 different pump outlet flow rates, the specific values of a6 at 11 different pump outlet flow rates, the specific values of a7 at 11 different pump outlet flow rates, the specific values of a8 at 11 different pump outlet flow rates, and the specific values of a9 at 11 different pump outlet flow rates. Each flow interval covers the entire flow range, ensuring smooth transitions between each flow interval and avoiding sudden changes in efficiency calculation caused by splicing of each flow interval.

[0061] In this embodiment, the non-linear regression model is a polynomial regression model, an exponential regression model or a machine learning model (such as a support vector machine regression model). Each flow rate interval corresponds to a non-linear regression model, and the specific values of the correction coefficients in this flow rate interval are determined by using the non-linear regression model of each flow rate interval.

[0062] Step A4: According to the specific values of each correction coefficient at each flow rate, the specific expression of the corresponding correction coefficient is obtained by using the method of polynomial fitting.

[0063] According to the specific values of each correction coefficient at different pump outlet flow rates in Table 2, the specific expressions of each correction coefficient can be obtained:

[0064]

[0065]

[0066] Among them, e represents the base of the natural logarithm.

[0067] Step A5: Substitute the specific expressions of each correction coefficient (Formulas (6) to (15)) into the electro-hydraulic proportional pump efficiency correction calculation model (Formula (4)), and then the electro-hydraulic proportional pump efficiency correction calculation model is obtained.

[0068] In order to verify the correctness of the electro-hydraulic proportional pump efficiency correction calculation model of the present invention, 12 total efficiency experimental measurement values are collected through experiments, and the pump efficiency correction calculation values and their absolute errors are calculated according to Formula (4) and Formulas (6) to (15), as shown in Table 3. It can be seen from Table 3 that the maximum absolute error of the pump efficiency correction calculation value is only 1.46%, and the average absolute error is 0.71%. Compared with the theoretical calculation formula of the electro-hydraulic proportional pump total efficiency, the average absolute error is reduced by 13.03%, which greatly improves the calculation accuracy of the pump efficiency.

[0069] Table 3 Comparison between experimental measurement values and correction calculation values of electro-hydraulic proportional pump

[0070]

[0071]

[0072] Embodiment 2

[0073] The electro-hydraulic proportional pump efficiency correction calculation method provided by the embodiment of the present invention includes the following steps:

[0074] Step B1: Invoke the electro-hydraulic proportional pump efficiency correction calculation model.

[0075] Among them, the electro-hydraulic proportional pump efficiency correction calculation model is constructed by using the electro-hydraulic proportional pump efficiency correction calculation modeling method of Embodiment 1 of the present application.

[0076] Step B2: Obtain the outlet flow rate q, rotational speed n, inlet and outlet pressure difference △P, and full displacement V of the electro-hydraulic proportional pump t max 。

[0077] Step B3: According to the electro-hydraulic proportional pump efficiency correction calculation model (such as Formula (4) and Formulas (6) - (15)), as well as the outlet flow rate q, rotational speed n, inlet and outlet pressure difference △P, and full displacement V t max , calculate the electro-hydraulic proportional pump efficiency correction calculated value η' t 。

[0078] Example 3

[0079] The embodiment of the present invention further provides an electronic device, which includes: a memory, a processor, and a computer program / instructions stored on the memory. The processor executes the computer program / instructions to implement the electro-hydraulic proportional pump efficiency correction calculation modeling method or the electro-hydraulic proportional pump efficiency correction calculation method in the embodiments of the present application.

[0080] Although not shown, the electronic device includes a processor, which can perform various appropriate operations and processes according to the programs and / or data stored in the read-only memory (ROM) and / or the programs and / or data loaded from the storage part into the random access memory (RAM). The processor can be a multi-core processor or can include multiple processors. In some embodiments, the processor can include a general main processor and one or more special coprocessors, such as a central processing unit, a graphics processing unit (GPU), a neural network processing unit (NPU), a digital signal processor (DSP), and so on. In the RAM, various programs and data required for device operation are also stored. The processor, ROM, and RAM are connected to each other through a bus. The input / output (I / O) interface is also connected to the bus.

[0081] The above-mentioned processor and memory are jointly used to execute the programs / instructions stored in the memory. When the programs / instructions are executed by a computer, they can implement the methods, steps, or functions described in the above embodiments.

[0082] Although not shown, the embodiment of the present invention further provides a computer-readable storage medium, on which computer programs / instructions are stored. When the computer programs / instructions are executed by a processor, they implement the electro-hydraulic proportional pump efficiency correction calculation modeling method or the electro-hydraulic proportional pump efficiency correction calculation method in the embodiments of the present application.

[0083] A readable storage medium includes permanent and non-permanent, removable and non-removable media and can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media do not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0084] Although not shown, embodiments of the present invention also provide a computer program product, including: computer programs / instructions, which, when executed by a processor, implement the electro-hydraulic proportional pump efficiency correction calculation modeling method or the electro-hydraulic proportional pump efficiency correction calculation method in the embodiments of the present application.

[0085] The above-disclosed are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or variations, which should all be covered within the protection scope of the present invention.

Claims

1. A method for calculating and modeling the efficiency correction of an electro-hydraulic proportional pump, characterized in that: The modeling method comprises: Based on the theoretical calculation formula of the total efficiency of the traditional hydraulic pump, a calculation model for the efficiency correction of the electro-hydraulic proportional pump is constructed; The experimental measurement values ​​of the total efficiency of the electro-hydraulic proportional pump at different flow rates are obtained respectively; Determine the specific value of each correction coefficient at each flow rate in the electro-hydraulic proportional pump efficiency correction calculation model according to the experimental measurement value of the total efficiency of the electro-hydraulic proportional pump at each flow rate; According to the specific value of each correction coefficient at each flow rate, a specific expression of each correction coefficient is obtained; The specific expression of each correction coefficient is substituted into the electro-hydraulic proportional pump efficiency correction calculation model to obtain the electro-hydraulic proportional pump efficiency correction calculation model.

2. The electro-hydraulic proportional pump efficiency correction calculation modeling method according to claim 1 is characterized in that: According to the experimental measurement value of the total efficiency of the electro-hydraulic proportional pump at each flow rate, a nonlinear regression model is used to determine the specific value of each correction coefficient in the electro-hydraulic proportional pump efficiency correction calculation model.

3. The electro-hydraulic proportional pump efficiency correction calculation modeling method according to claim 2 is characterized in that: The nonlinear regression model is a polynomial regression model, an exponential regression model or a machine learning model.

4. The electro-hydraulic proportional pump efficiency correction calculation modeling method according to claim 3 is characterized in that: The machine learning model is a support vector machine regression model.

5. The method for calculating and modeling the efficiency correction of an electro-hydraulic proportional pump according to any one of claims 1 to 4, characterized in that: The specific expression of the electro-hydraulic proportional pump efficiency correction calculation model is: Among them, η' t represents the calculated value of the efficiency correction of the electro-hydraulic proportional pump; q represents the outlet flow of the electro-hydraulic proportional pump; C s represents the liquid leakage coefficient; △P represents the inlet and outlet pressure difference of the electro-hydraulic proportional pump; μ represents the dynamic viscosity of the hydraulic oil; n represents the speed of the electro-hydraulic proportional pump; V t max Indicates the full displacement of the electro-hydraulic proportional pump; C v Represents the drag coefficient along the laminar flow; C f represents the friction resistance coefficient; T s Indicates the torque loss that is independent of system pressure and speed; a0, a1, a2, a3, a4, a5, a6, a7, a8, and a9 all indicate correction coefficients.

6. The electro-hydraulic proportional pump efficiency correction calculation modeling method according to claim 5 is characterized in that: The specific expression of each correction coefficient is: Here, e represents the base of natural logarithms.

7. A method for calculating the efficiency correction of an electro-hydraulic proportional pump, characterized in that: The calculation method includes: Calling an electro-hydraulic proportional pump efficiency correction calculation model; wherein the electro-hydraulic proportional pump efficiency correction calculation model is constructed using the electro-hydraulic proportional pump efficiency correction calculation modeling method according to any one of claims 1 to 6; Obtain the outlet flow, speed, inlet and outlet pressure difference and total displacement of the electro-hydraulic proportional pump; The efficiency correction calculation value of the electro-hydraulic proportional pump is calculated according to the electro-hydraulic proportional pump efficiency correction calculation model as well as the outlet flow rate, the rotation speed, the inlet and outlet pressure difference and the total displacement.

8. An electronic device comprising a memory, a processor, and a computer program / instruction stored in the memory, characterized in that: The processor executes the computer program / instructions to implement the electro-hydraulic proportional pump efficiency correction calculation modeling method according to any one of claims 1 to 6 or the electro-hydraulic proportional pump efficiency correction calculation method according to claim 7.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the electro-hydraulic proportional pump efficiency correction calculation modeling method according to any one of claims 1 to 6 or the electro-hydraulic proportional pump efficiency correction calculation method according to claim 7 is implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the electro-hydraulic proportional pump efficiency correction calculation modeling method according to any one of claims 1 to 6 or the electro-hydraulic proportional pump efficiency correction calculation method according to claim 7 is implemented.

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