Modeling Method of Valve Body

Abstract

The present invention provides a method for modeling a valve body, including: testing the valve body to obtain a first characteristic curve of the valve body; building a model of the valve body and performing simulation analysis to obtain a second characteristic curve; comparing the first characteristic curve and the second characteristic curve to obtain an error value; determining whether the error value exceeds a preset range; and encapsulating the model when the error value is within the preset range. The method for modeling a valve body provided by the present invention can compare the first characteristic curve of the valve body in the real situation with the second characteristic curve of the model of the valve body in the simulation situation, so as to determine the accuracy of the model. When the accuracy of the model meets the requirements, the model is encapsulated, thereby obtaining a model of the valve body with accurate height, which improves the accuracy of building the simulation model of the valve body.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulics, and more particularly, to a method for modeling a valve body. Background Art

[0002] The performance of a balance valve directly affects the stable and smooth operation and safety and reliability of a hydraulic system. There are mainly two methods for studying the performance of a balance valve: testing and simulation. The performance test of a balance valve is generally completed by building a balance valve test bench. A flow meter is installed on the test bench, and it is impossible to ensure the measurement accuracy of balance valves with different flow rates, resulting in a large gap between the performance curve of the tested balance valve and its actual operating performance. Currently, the simulation of balance valves is basically achieved based on professional hydraulic system simulation tools. The accuracy of establishing the simulation model determines the credibility of the simulation analysis results. How to improve the accuracy of the model is an urgent problem to be solved. Summary of the Invention

[0003] The present invention aims to at least solve or improve one of the technical problems existing in the related art.

[0004] To this end, some embodiments of the present invention provide a method for modeling a valve body.

[0005] According to some embodiments of the present invention, a method for modeling a valve body is proposed, including: testing the valve body to obtain a first characteristic curve of the valve body; building a model of the valve body and performing simulation analysis to obtain a second characteristic curve; comparing the first characteristic curve and the second characteristic curve to obtain an error value; determining whether the error value exceeds a preset range; and encapsulating the model when the error value is within the preset range.

[0006] The method for modeling a valve body proposed by the present invention first tests the performance of the valve body to be modeled to obtain a first characteristic curve regarding the performance of the valve body. Then, a model of the valve body is built, and simulation analysis is performed on the model to obtain a second characteristic curve regarding the performance of the model of the valve body. The first characteristic curve is compared with the second characteristic curve to determine the error value between the two. When the error value is within the preset range, that is, when the error value is within the allowable range, it indicates that the current model is qualified, and then the model is encapsulated.

[0007] That is, by comparing the first characteristic curve of the valve body in the actual situation of the test with the second characteristic curve of the model of the valve body in the simulation situation, the present invention can determine the accuracy of the model. When the accuracy of the model meets the requirements, the model is encapsulated, and then a valve body model with high accuracy is obtained, improving the accuracy of building the valve body simulation model.

[0008] Specifically, the first characteristic curve is a static characteristic curve, or a steady-state characteristic curve, and the second characteristic curve is a dynamic characteristic curve.

[0009] The modeling method of the valve body according to the above technical solution of the present invention may further have the following additional technical features:

[0010] On the basis of the above technical solution, further, it further includes: performing error analysis when the error value is not within the preset range; adjusting the model or retesting the valve body according to the result of the error analysis until the error value is within the preset range.

[0011] In this technical solution, when the error value is not within the preset range, error analysis is performed, that is, when the error value is large, the error is analyzed. Specifically, a large error value indicates a large difference between the model of the valve body and the actual valve body being tested. In this case, there are two situations. One is that the test result is incorrect, and the other is that the model construction is incorrect. Therefore, the error value is analyzed, and according to the analysis result, the valve body is retested or the model is updated, so that a valve body closer to the actual situation can be obtained.

[0012] Then a new first characteristic curve or a new second characteristic curve is obtained, the new first characteristic curve or the new second characteristic curve is compared, an updated error value is obtained, and then it is determined whether the updated error value is within the preset range. When the updated error value is within the preset range, that is, when the updated error value is within the allowable range, it indicates that the updated model is qualified, and then the updated model is encapsulated. When the updated error value is not within the preset range, that is, when the updated error value is not within the allowable range, it indicates that the updated model is unqualified, and then the steps of updating the model or retesting the valve body are performed again until the error value is within the preset range to obtain a qualified model. Therefore, by continuously updating the model or continuously retesting the valve body, a qualified model can finally be obtained, thereby improving the accuracy of the model.

[0013] On the basis of any of the above technical solutions, further, the step of performing error analysis when the error value is not within the preset range specifically includes: obtaining a sample characteristic curve when the error value is not within the preset range; comparing the sample characteristic curve, the first characteristic curve, and the second characteristic curve.

[0014] In this technical solution, when the error value is not within the preset range, a sample characteristic curve is introduced, and the sample characteristic curve is closer to the actual situation of the valve body. Therefore, it can be determined which of the first characteristic curve and the second characteristic curve has a larger error based on the sample characteristic curve.

[0015] On the basis of any of the above technical solutions, further, the step of adjusting the model or retesting the valve body according to the result of the error analysis until the error value is within the preset range specifically includes: adjusting the model when the sample characteristic curve is close to the first characteristic curve; retesting the valve body when the sample characteristic curve is close to the second characteristic curve.

[0016] In this technical solution, if the sample characteristic curve is close to the first characteristic curve, that is, relative to the second characteristic curve, if the sample characteristic curve is more similar to the first characteristic curve, it indicates that the error of the second characteristic curve is relatively large. In this case, it is necessary to adjust the model, and then update the model and the second characteristic curve.

[0017] If the sample characteristic curve is close to the second characteristic curve, that is, relative to the first characteristic curve, if the sample characteristic curve is more similar to the second characteristic curve, it indicates that the error of the first characteristic curve is relatively large. In this case, it is necessary to retest the valve body to obtain more accurate test results, and then update the first characteristic curve.

[0018] On the basis of any of the above technical solutions, further, the steps of adjusting the model specifically include: verifying the accuracy of the established model and the first characteristic curve according to the error value; adjusting the model according to the verification result.

[0019] In this technical solution, based on the error value, the accuracy of the model and the first characteristic curve is verified, that is, according to the situation of the error value, the accuracy of the model is verified. Specifically, the error value has positive and negative attributes, that is, there is a magnitude relationship among the values of the sample characteristic curve, the first characteristic curve, and the second characteristic curve. Therefore, according to the positive and negative relationship of the error value, the relationship between the parameters of the established model and the parameters of the real valve body can be determined. Therefore, adjusting the model according to the error value can obtain a valve body closer to the real situation.

[0020] On the basis of any of the above technical solutions, further, the steps of establishing a model of the valve body and performing simulation analysis to obtain the second characteristic curve specifically include: mapping the valve body and calculating parameters; establishing a model according to the mapping results and parameters; performing simulation analysis on the model to obtain the second characteristic curve.

[0021] In this technical solution, the specific steps of establishing a model of the valve body and performing simulation analysis to obtain the second characteristic curve are as follows: first, map the valve body and calculate the parameters of the valve body based on the mapping. Then, establish a model according to the mapping results and the calculated parameters. Then, perform simulation analysis on the model of the valve body to obtain the second characteristic curve. By using the method of physical mapping, initial data closer to the real valve body can be obtained, thereby improving the accuracy of the initial modeling, reducing the number of adjustments to the model, reducing the modeling time, and improving the efficiency.

[0022] On the basis of any of the above technical solutions, further, the steps of mapping the valve body and calculating parameters specifically include: disassembling the valve body to obtain the valve core; weighing, scanning, and measuring the valve core to obtain the structure of the valve core; determining the relationship between the flow area of the valve core and the displacement of the valve core according to the structure of the valve core.

[0023] In this technical solution, the valve body is surveyed and mapped, and the specific parameters are calculated as follows: the valve body is disassembled, the valve core is taken out, and the valve core is weighed, scanned and measured, so that various parameters required for modeling can be obtained. Moreover, by calculating the flow area of the valve core and combining the influence of the position of the valve core on the flow area, the relationship between the flow area of the valve core and the displacement of the valve core can be determined, so as to facilitate the setting of the flow parameters of the model.

[0024] On the basis of any of the above technical solutions, further, the steps of building a model according to the survey results and parameters specifically include: selecting corresponding components in the database of the modeling software according to the survey results and parameters to build the model.

[0025] In this technical solution, in the modeling software, there is usually a database storing mechanical component models. Therefore, according to the survey results and calculated parameters of the real valve body, the corresponding component models can be selected in the database to build the model of the valve body, thereby reducing the difficulty of model building and improving the speed of model building.

[0026] On the basis of any of the above technical solutions, further, the steps of performing simulation analysis on the model to obtain the second characteristic curve specifically include: performing simulation analysis on the model under the condition of load rising, performing simulation analysis on the model under the condition of load holding, and performing simulation analysis on the model under the condition of load dropping to obtain the second characteristic curve of the model.

[0027] In this technical solution, the valve body model is subjected to simulation analysis under different states, so as to obtain an accurate second characteristic curve, and thus it can be more accurately determined whether the model is qualified.

[0028] On the basis of any of the above technical solutions, further, the steps of packaging the model specifically include: storing the model in the form of a file in the modeling database.

[0029] In this technical solution, the valve body model is stored in the modeling database in the form of a file. Furthermore, as the number of valve body models increases, more valve body models can be obtained, which is convenient for subsequent model calling and sharing.

[0030] The additional aspects and advantages of the present invention will become obvious in the following description part, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0032] Figure 1Shows the schematic diagram of the valve body structure in the valve body modeling method provided by an embodiment of the present invention;

[0033] Figure 2 Shows the schematic diagram of the principle for testing the valve body in the valve body modeling method provided by an embodiment of the present invention;

[0034] Figure 3 Shows the schematic diagram of the model of the valve body established by the valve body modeling method provided by an embodiment of the present invention;

[0035] Figure 4 Shows the comparison diagram of the characteristic curves of the check valve in the valve body modeling method provided by an embodiment of the present invention;

[0036] Figure 5 Shows the comparison diagram of the characteristic curves of the main valve in the valve body modeling method provided by an embodiment of the present invention;

[0037] Figure 6 Shows the schematic diagram of the calculation result of the flow area of the valve core of the valve body in the valve body modeling method provided by an embodiment of the present invention;

[0038] Figure 7 Shows the flow chart of the valve body modeling method provided by an embodiment of the present invention;

[0039] Figure 8 Shows the flow chart of the valve body modeling method provided by another embodiment of the present invention;

[0040] Figure 9 Shows the flow chart of the valve body modeling method provided by another embodiment of the present invention;

[0041] Figure 10 Shows the flow chart of the valve body modeling method provided by another embodiment of the present invention;

[0042] Figure 11 Shows the flow chart of the valve body modeling method provided by another embodiment of the present invention;

[0043] Figure 12 Shows the flow chart of the valve body modeling method provided by another embodiment of the present invention;

[0044] Figure 13 Shows the flow chart of the valve body modeling method provided by another embodiment of the present invention;

[0045] Figure 14 Shows the flow chart of the valve body modeling method provided by another embodiment of the present invention;

[0046] Figure 15 Shows the flow chart of the valve body modeling method provided by another embodiment of the present invention.

[0047] Among them, Figure 1 and Figure 2 the corresponding relationship between the reference numerals and the component names in the attached drawings is as follows:

[0048] 100 valve body, 110 pilot control oil port, 120 main valve spool, 130 oil inlet, 140 check valve spool, 150 load end oil port, 160 valve sleeve, 200 test system, 210 first proportional relief valve, 220 first reversing valve, 240 first pressure sensor, 250 second pressure sensor, 260 first ball valve, 270 first flowmeter, 280 second ball valve, 290 second flowmeter, 300 third pressure sensor, 310 second reversing valve, 320 second proportional relief valve. Specific embodiments

[0049] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0050] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0051] The following refers to Figures 1 to 15 to describe the modeling method of the valve body according to some embodiments of the present invention.

[0052] Embodiment 1:

[0053] Figure 7 The flowchart of the modeling method of the valve body provided by an embodiment of the present invention is shown.

[0054] As Figure 7 shown, the specific process of the modeling method of the valve body provided by an embodiment of the present invention is as follows:

[0055] Step 702: Test the valve body to obtain the first characteristic curve of the valve body;

[0056] Step 704: Build a model of the valve body;

[0057] Step 706: Perform simulation analysis to obtain the second characteristic curve;

[0058] Step 708: Compare the first characteristic curve and the second characteristic curve to obtain an error value;

[0059] Step 710: Determine whether the error value exceeds a preset range; if the judgment result is negative, execute Step 712;

[0060] Step 712: Package the model.

[0061] The modeling method of the valve body provided by the present invention first tests the performance of the valve body to be modeled to obtain a first characteristic curve regarding the performance of the valve body. Then, a model of the valve body is built, and simulation analysis is performed on the model to obtain a second characteristic curve regarding the performance of the model of the valve body. The first characteristic curve is compared with the second characteristic curve to determine the error value therebetween. When the error value is within the preset range, that is, when the error value is within the allowable range, it indicates that the current model is qualified, and then the model is packaged.

[0062] That is, the present invention compares the first characteristic curve of the valve body in the real situation with the second characteristic curve of the model of the valve body in the simulation situation, and then can determine the accuracy of the model. When the accuracy of the model meets the requirements, the model is packaged, and then a model of the valve body with accurate height determination is obtained, improving the accuracy of building the simulation model of the valve body.

[0063] Specifically, the first characteristic curve and the second characteristic curve can be static characteristic curves, or also called steady-state characteristic curves, or can be dynamic characteristic curves.

[0064] Furthermore, the valve body can be a hydraulic valve or a pneumatic valve. Specifically, the valve body can be a balance valve or a countercurrent valve, etc.

[0065] As Figure 1 shown, the valve body 100 is composed of a check valve and a main valve. Specifically, it includes a valve sleeve 160, a main valve spool 120, a check valve spool 140, a load end oil port 150, an oil inlet port 130, a pilot control oil port 110, and a spring.

[0066] Adopt a test system 200 as Figure 2 shown to test the valve body 100.

[0067] The test system 200 includes: a first reversing valve 220, and the first reversing valve 220 has a first working port, a second working port, a third working port, and a fourth working port. The first reversing valve 220 has a left position state where the first working port and the second working port are connected and the third working port and the fourth working port are connected; and a right position state where the first working port and the fourth working port are connected and the third working port and the second working port are connected. Among them, the first working port is connected to a hydraulic source, the second working port is used to connect to the oil inlet port 130 of the valve body 100, and the fourth working port is connected to the oil outlet of the valve body 100.

[0068] A first ball valve 260, one end of which is connected to the third working port of the first reversing valve 220.

[0069] The first flowmeter 270 has one end connected to the other end of the first ball valve 260.

[0070] The second ball valve 280 has one end connected to the third working port of the first reversing valve 220.

[0071] The second flowmeter 290 has one end connected to the other end of the second ball valve 280.

[0072] The second reversing valve 310 has a fifth working port, a sixth working port, and a seventh working port. The second reversing valve 310 has a left position state where the fifth working port is in communication with the sixth working port and the seventh working port is disconnected; a right position state where the fifth working port is in communication with the seventh working port and the sixth working port is disconnected. Among them, the fifth working port is connected to the hydraulic source, the sixth working port is connected to the other ends of the first flowmeter 270 and the second flowmeter 290, and the seventh working port is connected to the pilot control oil port 110 of the valve body 100.

[0073] The first pressure sensor 240 is connected to the oil inlet port 130 of the valve body 100 and is used to measure the pressure of the oil inlet port 130 of the valve body 100.

[0074] The second pressure sensor 250 is connected to the oil outlet port of the valve body 100 and is used to measure the pressure of the oil outlet port of the valve body 100.

[0075] The third pressure sensor 300 is connected between the pilot control oil port 110 of the valve body 100 and the seventh working port of the second reversing valve 310 and is used to measure the pressure of the pilot control oil port 110 of the valve body 100.

[0076] The first proportional relief valve 210 and the second proportional relief valve 320 are connected in series between the first working port of the first reversing valve 220 and the fifth working port of the second reversing valve 310.

[0077] Embodiment 2:

[0078] Figure 8 The flowchart of the modeling method of the valve body provided by another embodiment of the present invention is shown.

[0079] As Figure 8 shown, the specific process of the modeling method of the valve body provided by another embodiment of the present invention is as follows:

[0080] Step 802: Test the valve body to obtain the first characteristic curve of the valve body;

[0081] Step 804: Build a model of the valve body;

[0082] Step 806: Perform simulation analysis to obtain the second characteristic curve;

[0083] Step 808: Compare the first characteristic curve and the second characteristic curve to obtain an error value;

[0084] Step 810: Determine whether the error value exceeds a preset range; if the judgment result is no, execute Step 812, and if the judgment result is yes, execute Step 814;

[0085] Step 812: Package the model;

[0086] Step 814: Conduct error analysis;

[0087] Step 816: Adjust the model according to the result of the error analysis; re-execute Step 806;

[0088] Step 818: Retest the valve body according to the result of the error analysis; re-execute Step 802. It should be noted that Steps 804 and 806 do not need to be re-executed.

[0089] Based on Embodiment 1, further, when the error value is not within the preset range, error analysis is performed, that is, when the error value is large, the error is analyzed. Specifically, a large error value indicates a large difference between the model of the valve body and the actual valve body being tested. In this case, there are two situations. One is that the test result is incorrect, and the other is that the model construction is incorrect.

[0090] Therefore, analyze the error value and, according to the analysis result, retest the valve body or update the model, so that a valve body closer to the actual situation can be obtained.

[0091] Specifically, after retesting the valve body, a new first characteristic curve is obtained. Compare the new first characteristic curve and the second characteristic curve to obtain an updated error value, and then determine whether the updated error value is within the preset range. When the updated error value is within the preset range, that is, when the updated error value is within the allowable range, it means that the updated first characteristic curve is qualified and the model is qualified, and then the model is packaged. When the updated error value is not within the preset range, that is, when the updated error value is not within the allowable range, it means that the first characteristic curve is unqualified and it is impossible to determine whether the model is qualified. Then, the step of retesting the valve body is executed again until the error value is within the preset range, a qualified first characteristic curve is obtained, and a qualified model is determined. Finally, a qualified model can be obtained, thereby improving the accuracy of the model.

[0092] Specifically, after adjusting the model, a new second characteristic curve is obtained. By comparing the first characteristic curve with the new second characteristic curve, an updated error value is obtained, and then it is determined whether the updated error value is within a preset range. When the updated error value is within the preset range, that is, when the updated error value is within the permitted range, it indicates that the updated model is qualified, and then the model is encapsulated. When the updated error value is not within the preset range, that is, when the updated error value is not within the permitted range, it indicates that the model is unqualified, and then the step of adjusting the model is executed again until the error value is within the preset range, and a qualified model is determined. Finally, a qualified model can be obtained, thereby improving the accuracy of the model.

[0093] Among them, the preset range can be selected according to the required accuracy. For example: -1 bar to 1 bar, -3 bar to 3 bar, 0 bar to 5 bar, or 3 bar to 10 bar, etc.

[0094] Specifically, when the error value is large, the reason for the error needs to be determined.

[0095] For example, when the value of the second characteristic curve of the model is higher than the first characteristic curve of the entity, it can be determined that each parameter of the model should be adjusted in the larger or smaller direction. For example: reducing or increasing the flow area of the valve core, etc. Specifically, the flow area of the valve core is as Figure 6 shown, and the valve core is located on the curve of the relationship with the flow area.

[0096] Furthermore, if the accuracy requirement is not met, an analysis of the error cause is carried out, and the model parameters are readjusted, thereby improving the simulation model and enhancing the model accuracy. The adjustable model parameters are empirical parameters.

[0097] Set the simulation model parameters of the valve body, conduct simulation analysis of the valve body under different working conditions, and obtain the second characteristic curve. In this embodiment, the second characteristic curve can be the flow-pressure difference curve of the check valve and the main valve. Extract the flow-pressure difference curve of the check valve and the main valve on the sample through data calculation. Measure the flow-pressure difference test data of the valve body on the hydraulic test bench, and perform data processing through data calculation to obtain the flow-pressure difference curve of the check valve and the main valve.

[0098] According to the comparison of the simulation results with the one-way valve characteristic curve and the main valve characteristic curve of the product sample data and test data as Figure 4 shown in Figure 5 If the characteristic comparison gap is large, an analysis of the error cause is required, the model parameters are adjusted, the simulation model is improved, and the model accuracy is enhanced, so that the final simulation result is consistent with the product test data (the difference between the simulation result and the product sample data and test data is controlled within the set range).

[0099] Embodiment 3:

[0100] Figure 9 The flowchart of the modeling method of the valve body provided by another embodiment of the present invention is shown.

[0101] As Figure 9 shown, the specific process of the modeling method of the valve body provided by another embodiment of the present invention is as follows:

[0102] Step 902: Test the valve body to obtain the first characteristic curve of the valve body;

[0103] Step 904: Build a model of the valve body;

[0104] Step 906: Conduct simulation analysis to obtain the second characteristic curve;

[0105] Step 908: Compare the first characteristic curve and the second characteristic curve to obtain an error value;

[0106] Step 910: Determine whether the error value exceeds a preset range; if the judgment result is no, execute Step 912, and if the judgment result is yes, execute Step 914;

[0107] Step 912: Package the model;

[0108] Step 914: Obtain a sample characteristic curve, and compare the sample characteristic curve, the first characteristic curve, and the second characteristic curve;

[0109] Step 916: If the sample characteristic curve is close to the first characteristic curve, adjust the model; re-execute Step 904;

[0110] Step 918: If the sample characteristic curve is close to the second characteristic curve, retest the valve body; it should be noted that Steps 904 and 906 do not need to be re-executed.

[0111] On the basis of Embodiment 2, further, if the sample characteristic curve is close to the first characteristic curve, that is, relative to the second characteristic curve, if the sample characteristic curve is more similar to the first characteristic curve, it means that the error of the second characteristic curve is larger. In this case, the model needs to be adjusted, and then the model is updated, and the second characteristic curve is updated.

[0112] If the sample characteristic curve is close to the second characteristic curve, that is, relative to the first characteristic curve, if the sample characteristic curve is more similar to the second characteristic curve, it means that the error of the first characteristic curve is larger. In this case, the valve body needs to be retested to obtain a more accurate test result, and then the first characteristic curve is updated. Specifically, the steps of adjusting the model specifically include: verifying the accuracy of the built model and the accuracy of the first characteristic curve according to the error value; adjusting the model according to the verification result.

[0113] In this embodiment, based on the error value, the accuracy of the verification model and the first characteristic curve is verified, that is, according to the situation of the error value, the accuracy of the model is verified. Specifically, the error value has positive and negative attributes, that is, there is a magnitude relationship among the values of the sample characteristic curve, the first characteristic curve, and the second characteristic curve. Furthermore, according to the positive and negative relationship of the error value, the relationship between the parameters of the built model and the parameters of the real valve body can be determined. Therefore, by adjusting the model according to the error value, a valve body closer to the real situation can be obtained.

[0114] Specifically, the excessive error value may be due to the building error of the model or the testing error of the first characteristic curve.

[0115] Specifically, the sample characteristic curve is the characteristic curve of the valve body provided by the manufacturer when purchasing the valve body. Usually, the sample characteristic curve is the average standard or sampling standard of the valve bodies of the same batch. For an individual valve body, there may be a difference between the sample characteristic curve and the real situation of the valve body.

[0116] Embodiment 4:

[0117] Figure 10 The flowchart of the modeling method of the valve body provided by another embodiment of the present invention is shown.

[0118] As Figure 10 shown, the specific process of the modeling method of the valve body provided by another embodiment of the present invention is as follows:

[0119] Step 1002: Test the valve body to obtain the first characteristic curve of the valve body;

[0120] Step 1004: Survey and map the valve body and calculate the parameters;

[0121] Step 1006: Build a model according to the survey results and parameters;

[0122] Step 1008: Conduct a simulation analysis on the model to obtain the second characteristic curve;

[0123] Step 1010: Compare the first characteristic curve and the second characteristic curve to obtain the error value;

[0124] Step 1012: Determine whether the error value exceeds the preset range; if the judgment result is no, execute step 1014; if the judgment result is yes, execute step 1016;

[0125] Step 1014: Package the model;

[0126] Step 1016: Obtain the sample characteristic curve and compare the sample characteristic curve, the first characteristic curve, and the second characteristic curve;

[0127] Step 1018: Adjust the model when the sample characteristic curve is close to the first characteristic curve; Re - execute Step 1004;

[0128] Step 1020: Retest the valve body when the sample characteristic curve is close to the second characteristic curve; It should be noted that Steps 1004, 1006, and 1008 do not need to be re - executed.

[0129] Based on any one of Embodiments 1 to 3, further, the specific steps to build the model of the valve body and perform simulation analysis to obtain the second characteristic curve are as follows: First, survey the valve body, and calculate the parameters of the valve body based on the survey. Then, build the model according to the survey results and the calculated parameters. Next, perform simulation analysis on the model of the valve body to obtain the second characteristic curve. By using the method of physical surveying, more realistic initial data of the valve body can be obtained, thereby improving the accuracy of the initial modeling, reducing the number of model adjustments, shortening the modeling time, and improving the efficiency. Embodiment 5:

[0130] Figure 11 The flowchart of the modeling method of the valve body provided by another embodiment of the present invention is shown.

[0131] As Figure 11 shown, the specific process of the modeling method of the valve body provided by another embodiment of the present invention is as follows:

[0132] Step 1102: Test the valve body to obtain the first characteristic curve of the valve body;

[0133] Step 1104: Disassemble the valve body to obtain the valve core;

[0134] Step 1106: Weigh, scan, and measure the valve core to obtain the structure of the valve core;

[0135] Step 1108: Determine the relationship between the flow - through area of the valve core and the displacement of the valve core according to the structure of the valve core;

[0136] Step 1110: Build the model according to the survey results and parameters;

[0137] Step 1112: Perform simulation analysis on the model to obtain the second characteristic curve;

[0138] Step 1114: Compare the first characteristic curve and the second characteristic curve to obtain the error value;

[0139] Step 1116: Determine whether the error value exceeds the preset range; If the judgment result is no, execute Step 1118; if the judgment result is yes, execute Step 1120;

[0140] Step 1118: Package the model;

[0141] Step 1120: Obtain the sample characteristic curve and compare the sample characteristic curve, the first characteristic curve, and the second characteristic curve;

[0142] Step 1122: Adjust the model when the sample characteristic curve is close to the first characteristic curve; Re - execute Step 1106;

[0143] Step 1124: Retest the valve body when the sample characteristic curve is close to the second characteristic curve; It should be noted that Steps 1104, 1106, 1108, 1110, and 1112 do not need to be re - executed.

[0144] Based on any one of Embodiments 1 to 4, further, map the valve body and calculate the parameters. Specifically, disassemble the valve body, take out the valve core, weigh, scan, and measure the valve core, and then various parameters required for modeling can be obtained. And by calculating the flow - through area of the valve core and combining the influence of the position of the valve core on the flow - through area, the relationship between the flow - through area of the valve core and the displacement of the valve core can be determined, so as to set the flow - through parameters of the model.

[0145] Embodiment 6:

[0146] Figure 12 Shows a flowchart of a modeling method for a valve body provided by another embodiment of the present invention.

[0147] As Figure 12 shown, the specific process of the modeling method for a valve body provided by another embodiment of the present invention is as follows:

[0148] Step 1202: Test the valve body to obtain the first characteristic curve of the valve body;

[0149] Step 1204: Disassemble the valve body to obtain the valve core;

[0150] Step 1206: Weigh, scan, and measure the valve core to obtain the structure of the valve core;

[0151] Step 1208: Determine the relationship between the flow - through area of the valve core and the displacement of the valve core according to the structure of the valve core;

[0152] Step 1210: Select corresponding components in the database of the modeling software according to the mapping results and parameters to build a model;

[0153] Step 1212: Perform simulation analysis on the model to obtain the second characteristic curve;

[0154] Step 1214: Compare the first characteristic curve and the second characteristic curve to obtain an error value;

[0155] Step 1216: Determine whether the error value exceeds a preset range; if the determination result is no, execute Step 1218, and if the determination result is yes, execute Step 1220;

[0156] Step 1218: Package the model;

[0157] Step 1220: Obtain the sample characteristic curve and compare the sample characteristic curve, the first characteristic curve, and the second characteristic curve;

[0158] Step 1222: Adjust the model when the sample characteristic curve is close to the first characteristic curve; re - execute Step 1206;

[0159] Step 1224: Retest the valve body when the sample characteristic curve is close to the second characteristic curve; it should be noted that Steps 1204, 1206, 1208, 1210, and 1212 do not need to be re - executed.

[0160] Based on any one of Embodiments 1 to 5, further, map the valve body and calculate the parameters. Specifically, disassemble the valve body, take out the valve core, weigh, scan, and measure the valve core, and then various parameters required for modeling can be obtained. And by calculating the flow - through area of the valve core and combining the influence of the position of the valve core on the flow - through area, the relationship between the flow - through area of the valve core and the displacement of the valve core can be determined, so as to set the flow - through parameters of the model.

[0161] Moreover, in the modeling software, there is usually a database storing mechanical element models. Therefore, according to the mapping results and calculated parameters of the real valve body, the corresponding element models can be selected from the database to build the model of the valve body, thereby reducing the difficulty of model building and improving the speed of model building.

[0162] Specifically, map the physical parameters of the valve body through test equipment, where the physical parameters include the mass of the valve core, the shape of the valve core, the size of the valve core, the stroke of the valve core, the covering amount of the valve core, the opening of the throttle edge, the size of the pressure chamber, the diameter of the throttle hole, the diameter of the damping hole, the spring stiffness, and the pre - compression amount of the spring. Disassemble the valve body, measure the mass of the valve core using a precision balance; measure the size of the valve core, the opening of the throttle edge, the shape of the valve core, the diameter of the throttle hole, the diameter of the damping hole, and the pre - compression amount of the spring using a three - coordinate scanner and calipers; measure the spring stiffness using a spring testing machine. According to the mapping results, the structure of the valve body can be drawn in 3D drawing software.

[0163] Embodiment 7:

[0164] Figure 13 Shows a flowchart of a method for modeling a valve body provided by another embodiment of the present invention.

[0165] As Figure 13 shown, the specific process of the modeling method of the valve body provided by another embodiment of the present invention is as follows:

[0166] Step 1302: Test the valve body to obtain the first characteristic curve of the valve body;

[0167] Step 1304: Disassemble the valve body to obtain the valve core;

[0168] Step 1306: Weigh, scan and measure the valve core to obtain the structure of the valve core;

[0169] Step 1308: Determine the relationship between the flow area of the valve core and the displacement of the valve core according to the structure of the valve core;

[0170] Step 1310: Select corresponding components in the database of the modeling software according to the survey results and parameters to build a model;

[0171] Step 1312: Perform simulation analysis on the model under the load rising condition, perform simulation analysis on the model under the load holding condition, and perform simulation analysis on the model under the load falling condition to obtain the second characteristic curve of the model;

[0172] Step 1314: Compare the first characteristic curve and the second characteristic curve to obtain an error value;

[0173] Step 1316: Determine whether the error value exceeds the preset range; if the judgment result is no, execute Step 1318, and if the judgment result is yes, execute Step 1320;

[0174] Step 1318: Package the model;

[0175] Step 1320: Obtain the sample characteristic curve and compare the sample characteristic curve, the first characteristic curve and the second characteristic curve;

[0176] Step 1322: Adjust the model when the sample characteristic curve is close to the first characteristic curve; re-execute Step 1306;

[0177] Step 1324: Retest the valve body when the sample characteristic curve is close to the second characteristic curve; it should be noted that Steps 1304, 1306, 1308, 1310 and 1312 do not need to be re-executed.

[0178] On the basis of any one of Embodiments 1 to 6, further, perform simulation analysis on the model of the valve body under different states to obtain an accurate second characteristic curve, so as to more accurately determine whether the model is qualified. The valve body structure is as Figure 1As shown in the figure, it includes a valve sleeve 160, a main valve spool 120, a check valve spool 140, a load port 150, an oil inlet port 130, a pilot control oil port 110, and a spring.

[0179] The valve body 100 usually has three working conditions: the load rising condition, the load holding condition, and the load falling condition.

[0180] In the load rising condition, the pressure oil flows freely from the oil inlet port 130 to the load port 150.

[0181] In the load holding condition, there is no pressure oil at the pilot control oil port 110, and the load port 150 to the oil inlet port 130 is in a closed state.

[0182] In the load falling condition, the pressure oil at the pilot control oil port 110 acts on the pilot control spool, causing the load port 150 to return oil to the oil inlet port 130.

[0183] According to the structure and working principle of the valve body 100, select appropriate components in the hydraulic component library, mechanical library, and signal library of the simulation software to build a model. The simulation model of the valve body 100 is as Figure 3 shown. The model includes a mass component, a throttle orifice component, a piston component, a spring component, a damping hole component, a variable volume component, and a leakage component. The parameters of the mass component include mass, movement direction, movement stroke, static friction, and viscous damping. The parameters of the throttle orifice component include spool opening, spool diameter, spool stroke, spool overlap, spool flow area, flow coefficient, hydraulic force, angle of incidence, and angle of incidence coefficient. The parameters of the piston component include the dimensions of the main valve spool 120 and the check valve spool 140. The parameters of the spring component include spring pre-compression and spring stiffness; the parameters of the leakage component include spool major diameter, fit clearance, and seal length. The parameters of the damping hole component include damping hole size. The parameters of the variable volume component include cavity size.

[0184] Among them, the spool mass, spool shape, spool size, spool stroke, spool overlap, throttle edge opening, pressure cavity size, throttle hole diameter, damping hole diameter, spring stiffness, spring pre-compression, damping hole size, and variable cavity size have been accurately measured through the surveying and mapping in Step 2. Among them, the spool flow area has been obtained through the numerical calculation method in Step 3. Among them, the static friction, viscous damping, flow coefficient, hydraulic force, angle of incidence, and angle of incidence coefficient are empirical parameters.

[0185] Carry out the simulation analysis of the valve body 100 under the three working conditions of load rising, load holding, and load falling to obtain the second check valve characteristic curve and the second main valve characteristic curve in the valve body 100.

[0186] Example 8:

[0187] Figure 14The flowchart of the modeling method of the valve body provided by another embodiment of the present invention is shown.

[0188] As Figure 14 shown, the specific process of the modeling method of the valve body provided by another embodiment of the present invention is as follows:

[0189] Step 1402: Test the valve body to obtain the first characteristic curve of the valve body;

[0190] Step 1404: Disassemble the valve body to obtain the valve core;

[0191] Step 1406: Weigh, scan and measure the valve core to obtain the structure of the valve core;

[0192] Step 1408: Determine the relationship between the flow area of the valve core and the displacement of the valve core according to the structure of the valve core;

[0193] Step 1410: Select corresponding components in the database of the modeling software according to the surveying and mapping results and parameters, and build a model;

[0194] Step 1412: Perform simulation analysis on the model under the load rising condition, perform simulation analysis on the model under the load holding condition, and perform simulation analysis on the model under the load dropping condition to obtain the second characteristic curve of the model;

[0195] Step 1414: Compare the first characteristic curve and the second characteristic curve to obtain an error value;

[0196] Step 1416: Determine whether the error value exceeds the preset range; if the judgment result is no, execute step 1418, and if the judgment result is yes, execute step 1422;

[0197] Step 1418: Package the model;

[0198] Step 1420: Store the model in the modeling database in the form of a file;

[0199] Step 1422: Obtain the sample characteristic curve and compare the sample characteristic curve, the first characteristic curve and the second characteristic curve;

[0200] Step 1424: Adjust the model when the sample characteristic curve is close to the first characteristic curve; re-execute step 1406;

[0201] Step 1426: Retest the valve body when the sample characteristic curve is close to the second characteristic curve; it should be noted that steps 1404, 1406, 1408, 1410 and 1412 do not need to be re-executed.

[0202] Based on any one of Embodiments 1 to 7, further, the model of the valve body is stored in the modeling database in the form of a file. Then, as the number of valve body models increases, more valve body models can be obtained, which is convenient for subsequent model calls and sharing.

[0203] Specifically, the valve body simulation model that meets the accuracy requirements is encapsulated. Only the input and output interfaces are left for the established valve body simulation model for model encapsulation, which can be applied to the construction of the whole machine hydraulic system model. After model encapsulation, a model library is formed, which can effectively improve the reusability of the model. The encapsulated model is stored in the form of a file and has portability to achieve model sharing. A continuously enriched module library can be established to meet the needs of system simulation in the construction machinery industry.

[0204] Embodiment 9:

[0205] Based on any one of Embodiments 1 to 8, further, the steps of testing the balance valve to obtain the first characteristic curve of the balance valve specifically include: testing the check valve in the balance valve, by changing the flow rate entering the check valve, obtaining the first inlet pressure and the first outlet pressure of the check valve at different flow rates, and calculating to obtain the first check valve characteristic curve.

[0206] In this embodiment, the balance valve is an integrated valve composed of a check valve and a main valve. Therefore, by testing the check valve in the balance valve at different flow rates, obtaining the first inlet pressure and the first outlet pressure of the check valve at different flow rates, and calculating to obtain the first check valve characteristic curve, the qualification of the model can be determined more accurately.

[0207] Embodiment 10:

[0208] Based on any one of Embodiments 1 to 9, further, the steps of testing the balance valve to obtain the first characteristic curve of the balance valve specifically include: testing the main valve in the balance valve, controlling the main valve to be fully opened, by changing the flow rate entering the main valve, obtaining the second inlet pressure and the second outlet pressure of the main valve at different flow rates, and calculating to obtain the first main valve characteristic curve.

[0209] In this embodiment, the balance valve is an integrated valve composed of a check valve and a main valve. Therefore, by testing the main valve in the balance valve at different flow rates, obtaining the second inlet pressure and the second outlet pressure of the main valve at different flow rates, and calculating to obtain the first main valve characteristic curve, the qualification of the model can be determined more accurately.

[0210] Embodiment 11:

[0211] Figure 15 The flowchart of the modeling method of the valve body provided by another embodiment of the present invention is shown.

[0212] As Figure 15 shown, the specific process of the modeling method of the valve body provided by another embodiment of the present invention is as follows:

[0213] Step 1502: Test the valve body;

[0214] Step 1504: Obtain the sample data of the valve body;

[0215] Step 1506: Survey and map the valve body (physical parameters);

[0216] Step 1508: Numerical calculation (calculation parameters);

[0217] Step 1510: Modeling and simulation;

[0218] Step 1512: Obtain the simulation data;

[0219] Step 1514: Characteristic comparison;

[0220] Step 1516: Judge whether the accuracy requirement is met according to the comparison result; if the judgment result is yes, execute Step 1518, and if the judgment result is no, execute Step 1520;

[0221] Step 1518: Package the model;

[0222] Step 1520: Analyze the error cause.

[0223] Specifically:

[0224] Step 1502: Test

[0225] The bench test principle of 100 valve bodies is as Figure 2 shown.

[0226] Performance test of the check valve in the valve body 100: As Figure 2 shown, the second reversing valve 310 works in the right position state, the check valve of the valve body 100 to be tested is opened, by changing the flow rate of the oil source, the first sensor and the second sensor are used to test the pressures P1 and P2 at the inlet and outlet of the check valve under different flow rates, and the pressure difference is calculated through P1 and P2, so as to obtain the pressure loss curve of the check valve when the flow rate changes, that is, the first check valve characteristic curve.

[0227] Performance test of the main valve in the valve body 100: As Figure 2As shown, the second reversing valve 310 operates in the left position, and the first reversing valve 220 also operates in the left position. Adjust the second electro-hydraulic proportional relief valve to make the control oil pressure of the valve body 100 large enough to ensure that the main valve is fully opened. At this time, the check valve is closed. By adjusting the oil source, change the flow rate entering the main valve through the second reversing valve 310. Use the first pressure sensor 240 to measure the pressure P3 at the inlet port 130 of the main valve at different flow rates, and use the second pressure sensor 250 to measure the pressure P4 at the outlet port of the main valve. Calculate the pressure difference between the inlet and outlet ports of the main valve, so as to obtain the pressure loss curve of the main valve when the flow rate changes, that is, the first main valve characteristic curve.

[0228] The sixth working port of the second reversing valve 310 is connected in parallel with two first flow meters 270 and 290 with large ranges and small ranges. Use the first ball valve 260 and the second ball valve 280 to control the flow rate entering the first flow meter 270 or the second flow meter 290 according to the measured flow rate of the valve body 100.

[0229] Step 1504: Surveying and mapping

[0230] Use the test equipment to survey and map the physical parameters of the valve body 100. The physical parameters include the mass of the spool, the shape of the spool, the size of the spool, the stroke of the spool, the covering amount of the spool, the opening degree of the throttle edge, the size of the pressure cavity, the diameter of the throttle hole, the diameter of the damping hole, the spring stiffness, and the pre-compression amount of the spring. Disassemble the valve body 100 and use a precision balance to measure the mass of the spool. Use a coordinate measuring machine and a caliper to measure the size of the spool, the opening degree of the throttle edge, the shape of the spool, the diameter of the throttle hole, the diameter of the damping hole, and the pre-compression amount of the spring. Use a spring testing machine to measure the spring stiffness. According to the surveying and mapping results, the structure of the valve body 100 can be drawn in 3D drawing software. The 3D structure diagram of the spool of the valve body 100 is as Figure 1 shown.

[0231] Step 1506:

[0232] Obtain the sample data provided by the manufacturer.

[0233] Step 1508:

[0234] Use numerical calculation methods to obtain calculation parameters, and process the sample data and test data. The calculation parameters include the flow area of the spool. The flow area of the spool refers to the opening area of the spool perpendicular to the direction of liquid flow. Through the 3D valve body 100 model obtained by surveying and mapping, use numerical calculation methods to obtain the flow area of the spool at different opening degrees. The test data is the valve characteristic curve obtained through the valve body 100 test bench.

[0235] The flow area of the spool of the valve body 100 obtained by numerical calculation is as Figure 6 shown. The sample curve of the valve body 100 is obtained through data processing software.

[0236] Step 1510: Modeling and Simulation

[0237] Build a model according to the structure and working principle of the valve body 100, and set the model parameters based on the physical parameters obtained from surveying and mapping and the calculation parameters obtained from numerical calculations.

[0238] Taking a certain valve body 100 as an example, the modeling and simulation are described as follows:

[0239] The structure of the valve body 100 is as Figure 1 shown, including a valve sleeve 160, a main valve spool 120, a check valve spool 140, a load port 150Load1, an oil inlet port 130Valve2, a pilot control oil port 110Pilot3, and a spring.

[0240] Step 1512: Obtain Simulation Data

[0241] The valve body 100 usually has three working conditions: the load rising condition, the load holding condition, and the load falling condition.

[0242] In the load rising condition, at this time, the pressure oil freely flows from the oil inlet port 130Valve2 to the load port 150Load1;

[0243] In the load holding condition, at this time, there is no pressure oil at the pilot control oil port 110Pilot3, and the load port 150Load1 to the oil inlet port 130Valve2 is in a closed state;

[0244] In the load falling condition, at this time, the pressure oil at the pilot control oil port 110Pilot3 acts on the pilot control spool, causing the oil to return from the load port 150Load1 to the oil inlet port 130Valve2.

[0245] Select appropriate components from the hydraulic component library, mechanical library, and signal library in the AMESim software to build a model according to the structure and working principle of the valve body 100. The simulation model of the valve body 100 is as Figure 3 shown, and the model includes a mass component, a throttle orifice component, a piston component, a spring component, a damping orifice component, a variable volume component, and a leakage component. The parameters of the mass component include mass, movement direction, movement stroke, static friction, and viscous damping. The parameters of the throttle orifice component include spool opening, spool diameter, spool stroke, spool overlap, spool flow area, flow coefficient, hydrodynamic force, incident angle, and incident angle coefficient. The parameters of the piston component include the sizes of the main valve spool 120 and the check valve spool 140. The parameters of the spring component include spring pre-compression and spring stiffness. The parameters of the leakage component include spool major diameter, mating clearance, and sealing length; the parameters of the damping orifice component include damping orifice size. The parameters of the variable volume component include cavity size.

[0246] Among them, the spool mass, spool shape, spool size, spool stroke, spool overlap, throttle edge opening, pressure chamber size, throttle hole diameter, damping hole diameter, spring stiffness, spring pre-compression, damping hole size, and variable chamber size have been accurately measured through surveying in step 1506. Among them, the spool flow area has been obtained through the numerical calculation method in step 1508. Among them, the static friction force, viscous damping, flow coefficient, hydrodynamic force, incident angle, and incident angle coefficient are empirical parameters.

[0247] Perform simulation analysis of the valve body 100 under three working conditions of load rising, load holding, and load falling to obtain the characteristic curves of the second check valve and the second main valve in the valve body 100.

[0248] Step 1514: Characteristic comparison

[0249] Compare the characteristic curves of the valve body 100 obtained from the simulation analysis with the sample data and test data.

[0250] Step 1516: Determine whether the accuracy requirements are met according to the comparison results

[0251] If the accuracy requirements are not met, analyze the reasons for the error, readjust the model parameters, thereby improving the simulation model and enhancing the model accuracy. Among them, the adjustable model parameters are empirical parameters.

[0252] Step 1518: Model encapsulation

[0253] Encapsulate the simulation model of the valve body 100 that meets the accuracy requirements. Only leave the input and output interfaces for the established simulation model of the valve body 100 for model encapsulation, which can be applied to the construction of the overall machine hydraulic system model. After model encapsulation, a model library is formed, which can effectively improve the reusability of the model. The encapsulated model is stored in the form of a file, with portability, realizing model sharing. A continuously enriched module library can be established to meet the needs of system simulation in the construction machinery industry.

[0254] Step 1520: Analysis of error causes

[0255] Set the simulation model parameters of the valve body 100, perform simulation analysis of the valve body 100 under different working conditions to obtain characteristic curves. In this embodiment, the characteristic curves are the flow-pressure difference curves of the check valve and the main valve. Extract the flow-pressure difference curves of the check valve and the main valve on the sample through data calculation. Measure the flow-pressure difference test data of the valve body 100 on the hydraulic test bench and perform data processing through data calculation to obtain the flow-pressure difference curves of the check valve and the main valve.

[0256] According to the comparison of the characteristic curves of the check valve and the main valve between the simulation results and the product sample data and test data as Figure 4 and Figure 5As shown in the figure, if the difference in characteristic comparison is large, it is necessary to analyze the cause of the error, adjust the model parameters, improve the simulation model, and improve the model accuracy, so that the final simulation result is consistent with the product test data (the difference between the simulation result and the product sample data and test data is controlled within the set range).

[0257] In the present invention, accurate test data are obtained through the bench performance test of 100 valve bodies. By mapping the structure of the 100 valve bodies, the physical parameters required in the simulation model of the 100 valve bodies are measured. The calculation parameters (such as the flow area of the spool) required in the simulation model of the 100 valve bodies are obtained by using the numerical calculation method. Thus, the input parameters of the simulation model of the 100 valve bodies have high accuracy. Based on the structure and working principle of the 100 valve bodies, a model is built, and the simulation model parameters are set based on the obtained physical parameters and calculation parameters.

[0258] The simulation analysis of the 100 valve bodies under three working conditions of load rising, load holding, and load falling is carried out to obtain the characteristic curves of the check valve and the main valve of the 100 valve bodies. Then, the characteristic curves obtained by the simulation of the 100 valve body model are compared with the sample data and experimental data. If the accuracy requirements are not met, the cause of the error is analyzed, the empirical parameters in the model are further adjusted to improve the modeling accuracy, and the simulation model of the 100 valve bodies is encapsulated to form a portable 100 valve body model, which can conveniently realize model sharing, improve the reusability, is beneficial to the expansion of the hydraulic component model library, and further realizes the high-precision simulation and optimized modeling design of the hydraulic control system of construction machinery.

[0259] In summary, it can be seen that the modeling method of a 100 valve body proposed by the present invention can better reflect the performance of actual work. Based on this method, the 100 valve body model has high accuracy of model parameters and high credibility of simulation results, greatly improving the modeling efficiency and achieving the purpose of quickly verifying the feasibility of the hydraulic system scheme.

[0260] Specifically, the modeling method of the 100 valve body provided by the present invention has the following advantages:

[0261] 1. The first flowmeter 270 and the second flowmeter 290 with two ranges of sizes are used to improve the flow measurement accuracy, and the pressure sensor is used to improve the pressure measurement accuracy.

[0262] 2. The physical parameters and calculation parameters are obtained through the mapping and numerical calculation methods, improving the accuracy of the input parameters in the simulation model, and thus improving the model accuracy.

[0263] 3. The characteristic curves obtained by the simulation of the established hydraulic component model are compared with the sample data and experimental data, the model parameters are adjusted, and the simulation model is improved, so that the final simulation result is consistent with the product test data, and the simulation result has high credibility.

[0264] 4. Perform model encapsulation, which can be applied to the construction of the overall machine hydraulic system model. After model encapsulation, a model library is formed, which can effectively improve the reusability of the model and achieve model sharing.

[0265] In the description of the present invention, the term "a plurality of" means two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0266] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0267] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A modeling method for a valve body, characterized in that, Including: Testing the valve body to obtain the first characteristic curve of the valve body; Building a model of the valve body and performing simulation analysis to obtain a second characteristic curve; Comparing the first characteristic curve and the second characteristic curve to obtain an error value; Judging whether the error value exceeds a preset range; If the error value is not within the preset range, perform error analysis; specifically including: when the error value is not within the preset range, obtaining a sample characteristic curve; comparing the sample characteristic curve, the first characteristic curve and the second characteristic curve; According to the result of the error analysis, adjust the model or retest the valve body, specifically including: when the sample characteristic curve is close to the first characteristic curve, adjusting the model; when the sample characteristic curve is close to the second characteristic curve, retesting the valve body; until the error value is within the preset range; If the error value is within the preset range, package the model.

2. The modeling method of the valve body according to claim 1, wherein The step of adjusting the model specifically includes: According to the error value, verify the accuracy of building the model and the accuracy of the first characteristic curve; Adjust the model according to the verification result.

3. The modeling method of the valve body according to claim 1, characterized in that, The step of building a model of the valve body and performing simulation analysis to obtain a second characteristic curve specifically includes: Surveying and mapping the valve body and calculating parameters; Building the model according to the result of the surveying and mapping and the parameters; Performing the simulation analysis on the model to obtain the second characteristic curve.

4. The modeling method of the valve body according to claim 3, characterized in that The step of surveying and mapping the valve body and calculating parameters specifically includes: Disassembling the valve body to obtain the valve core; Weighing, scanning and measuring the valve core to obtain the structure of the valve core; According to the structure of the valve core, determining the relationship between the flow area of the valve core and the displacement of the valve core.

5. The modeling method of the valve body according to claim 3, characterized in that, The step of building the model according to the result of the surveying and mapping and the parameters specifically includes: Selecting corresponding components in the database of the modeling software according to the result of the surveying and mapping and the parameters to build the model.

6. The modeling method of the valve body according to claim 3, characterized in that The step of performing simulation analysis on the model to obtain the second characteristic curve specifically includes: Performing simulation analysis on the model under the condition of load rising, performing simulation analysis on the model under the condition of load holding, and performing simulation analysis on the model under the condition of load falling to obtain the second characteristic curve of the model.

7. The modeling method of the valve body according to claim 1, characterized in that The step of packaging the model specifically includes: Storing the model in the form of a file in the modeling database.

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