Hydraulic system state evaluation method, device, equipment, medium and program product

Abstract

The invention provides a hydraulic system state evaluation method and device, equipment, a medium and a program product. The method comprises the steps that an abrasion prediction model of hydraulic elements in a hydraulic system is established according to a three-dimensional fluid simulation model; inputting the operation data of the hydraulic element into the wear prediction model to obtain a wear prediction value of the hydraulic element; obtaining a health value of the hydraulic element according to the wear prediction value; obtaining a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system; obtaining the health value of the hydraulic system according to the health value and the weight value of the hydraulic element; and evaluating the state of the hydraulic system according to the health value of the hydraulic element and the health value of the hydraulic system. The wear prediction model of the hydraulic element is established through the three-dimensional fluid simulation model, the wear prediction value of the hydraulic element is obtained based on the wear prediction model, and the state of the hydraulic system is evaluated according to the obtained health value of the hydraulic element and the health value of the hydraulic system, so that the cost and difficulty of data collection are reduced, and the reliability is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of hydraulic system status assessment, and in particular to a hydraulic system status assessment method, device, equipment, medium and program product. Background Art

[0002] A hydraulic system is a set of devices that utilizes the pressure energy of oil and controls the operation of hydraulic actuators through components such as control valves. The hydraulic circuits composed of hydraulic systems are used to drive mechanical devices for various purposes. In the design phase, it is a common method to use hydraulic simulation analysis systems to guide design; in the operation and maintenance phase, health prediction and fault diagnosis of hydraulic systems generally adopt some data-driven methods, by collecting a large amount of equipment operation data and fault sample data to establish models for prediction.

[0003] In the prior art, the hydraulic system is usually evaluated in the following ways: (1) the simulation controller is connected to the human-machine interface for communication, and the simulation controller is electrically connected to the hydraulic control cabinet. The simulation controller receives the output signal of the hydraulic control cabinet and simulates the valve body action and pressure / oil level dynamic control of the hydraulic system. The calculation results after simulation are output to the hydraulic control cabinet for actual control signal output. By simulating the valve body and system pressure / oil level of the hydraulic system of the turbine governor in the simulation controller and outputting the corresponding signal to interact with the hydraulic control cabinet, the hydraulic simulation device adopts touch screen intelligent control and intelligent display. The hydraulic pressure, liquid level, pump operation, flow monitoring and valve opening and other related data of the hydraulic system can be viewed through the touch screen. The hydraulic control system can also be simulated through the touch screen to fully simulate the action of the hydraulic system on site. (2) In view of the problem that the current small sample hydraulic system fault diagnosis accuracy is poor, the collected hydraulic system data is used to synthesize the fault sample, complete the expansion of the fault sample, and the fault sample is fused with the original healthy data and fault data for training the fault diagnosis model, thereby improving the generalization ability of the model and improving the accuracy of small sample fault diagnosis. (3) The results of the hydraulic system fault diagnosis and prediction method driven by the digital twin model and the results of the hydraulic system fault diagnosis and prediction method driven by the data are input into the initialized fusion algorithm, and the remaining service life and probability density are calculated using the fusion algorithm to obtain the required remaining service life of the hydraulic system. However, the above evaluation method has the advantages of high cost and low reliability.

[0004] In addition, during the design phase, using a hydraulic simulation analysis system to guide design is a common method. During simulation, the operating data of each hydraulic component under different simulated working conditions is accumulated. This data can be used to guide hydraulic system status assessment and maintenance plans during the operation and maintenance phase. During the operation and maintenance phase, the health prediction and fault diagnosis of the hydraulic system generally adopt some data-driven methods. By collecting a large amount of equipment operation data and fault sample data, a model is established for prediction. However, this data generally needs to cover the entire life cycle of the equipment, which is difficult to collect. The data is collected by building a test bench, and the collection cost is high. Summary of the invention

[0005] The technical problem to be solved by the present disclosure is to overcome the defects of the evaluation method of the hydraulic system in the prior art, such as the difficulty in data collection, high collection cost and low reliability, and to provide a method, device, equipment, medium and program product for evaluating the status of a hydraulic system.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A first aspect of the present disclosure provides a method for evaluating a hydraulic system state, the method comprising:

[0008] Establish a wear prediction model for hydraulic components in a hydraulic system based on a three-dimensional fluid simulation model;

[0009] Inputting the operating data of the hydraulic element into the wear prediction model to obtain the wear prediction value of the hydraulic element;

[0010] Acquire the health value of the hydraulic element according to the wear prediction value;

[0011] Obtaining a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system;

[0012] Acquire the health value of the hydraulic system according to the health value of the hydraulic element and the weight value;

[0013] The hydraulic system state is evaluated according to the health value of the hydraulic component and the health value of the hydraulic system.

[0014] Preferably, before the step of establishing a wear prediction model for hydraulic components in a hydraulic system according to the three-dimensional fluid simulation model, the evaluation method further comprises:

[0015] A three-dimensional fluid simulation model of hydraulic components is constructed based on the selection of hydraulic components in the hydraulic system.

[0016] Preferably, the step of obtaining the health value of the hydraulic element according to the wear prediction value comprises:

[0017] Obtaining a health value of the hydraulic element according to a ratio of the wear prediction value to a lower wear limit value of the hydraulic element;

[0018] and / or,

[0019] The operation data includes input parameters and output parameters, and the step of obtaining the weight value of the influence of the hydraulic element on the efficiency of the hydraulic system includes:

[0020] Inputting the hydraulic element input parameters and the preset wear value into the three-dimensional fluid simulation model to obtain the output parameters of the hydraulic element under the preset wear value;

[0021] Obtaining output parameters of the hydraulic element under normal conditions;

[0022] A weight value of the influence of the hydraulic element on the efficiency of the hydraulic system is obtained according to a ratio of an output parameter of the hydraulic element under wear conditions to an output parameter of the hydraulic element under normal conditions.

[0023] Preferably, the step of acquiring the health value of the hydraulic system according to the health value of the hydraulic element and the weight value comprises:

[0024] The health value of the hydraulic system is obtained by weighted averaging the health values ​​of the hydraulic components according to the weight values.

[0025] Preferably, the step of evaluating the state of the hydraulic system according to the health value of the hydraulic element and the health value of the hydraulic system comprises:

[0026] In response to the health value of the hydraulic component being less than or equal to a first preset health value, maintenance prompt information of the hydraulic component is output.

[0027] Preferably, the step of evaluating the state of the hydraulic system according to the health value of the hydraulic element and the health value of the hydraulic system further comprises:

[0028] In response to the health value of the hydraulic system being less than or equal to a second preset health value, multiplying the health value of each hydraulic component in the hydraulic system by a corresponding weight value to obtain a health value score of each hydraulic component;

[0029] The health value scores of the hydraulic components are sorted from low to high;

[0030] The maintenance prompt information of the corresponding hydraulic components is outputted in the order of the health value scores from low to high.

[0031] A second aspect of the present disclosure provides a device for evaluating a hydraulic system state, the device comprising:

[0032] A first building module is used to establish a wear prediction model of hydraulic components in a hydraulic system according to a three-dimensional fluid simulation model;

[0033] A first acquisition module, used for inputting the operation data of the hydraulic element into the wear prediction model to obtain the wear prediction value of the hydraulic element;

[0034] A second acquisition module, configured to acquire a health value of the hydraulic element according to the wear prediction value;

[0035] A third acquisition module is used to obtain a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system;

[0036] a fourth acquisition module, configured to acquire a health value of the hydraulic system according to the health value of the hydraulic element and the weight value;

[0037] An evaluation module is used to evaluate the state of the hydraulic system according to the health value of the hydraulic element and the health value of the hydraulic system.

[0038] Preferably, the evaluation device further comprises:

[0039] The second construction module is used to construct a three-dimensional fluid simulation model of the hydraulic element according to the selection of the hydraulic element in the hydraulic system.

[0040] Preferably, the second acquisition module is used to obtain the health value of the hydraulic element according to the ratio of the wear prediction value to the wear lower limit value of the hydraulic element;

[0041] and / or,

[0042] The operation data includes input parameters and output parameters, and the third acquisition module includes:

[0043] A first acquisition unit, configured to input the hydraulic element input parameter and the preset wear value into the three-dimensional fluid simulation model to obtain the output parameter of the hydraulic element under the preset wear value;

[0044] A second acquisition unit, used to acquire an output parameter of the hydraulic element under normal conditions;

[0045] The third acquisition unit is used to acquire a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system according to the ratio of the output parameter of the hydraulic element under wear conditions to the output parameter under normal conditions.

[0046] Preferably, the fourth acquisition module is used to obtain the health value of the hydraulic system by weighted averaging the health values ​​of the hydraulic components according to the weight values.

[0047] Preferably, the evaluation module comprises:

[0048] The first output unit is configured to output maintenance prompt information of the hydraulic component in response to the health value of the hydraulic component being less than or equal to a first preset health value.

[0049] Preferably, the evaluation module further includes:

[0050] a fourth acquisition unit, configured to, in response to the health value of the hydraulic system being less than or equal to a second preset health value, multiply the health value of each hydraulic component in the hydraulic system by a corresponding weight value to obtain a health value score of each hydraulic component;

[0051] A sorting unit, used to sort the health value scores of the hydraulic components from low to high;

[0052] The second output unit is used to output maintenance prompt information of the corresponding hydraulic components in order of the health value scores from low to high.

[0053] A third aspect of the present disclosure provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and used to run on the processor, wherein the processor implements the method for evaluating the hydraulic system status described in the first aspect when executing the computer program.

[0054] A fourth aspect of the present disclosure provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method for evaluating the hydraulic system state described in the first aspect.

[0055] A fifth aspect of the present disclosure provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method for evaluating the state of a hydraulic system as described in the first aspect.

[0056] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0057] The positive and progressive effects of this disclosure are:

[0058] The present invention establishes a wear prediction model for hydraulic components in a hydraulic system through a three-dimensional fluid simulation model, obtains wear prediction values ​​of the hydraulic components based on the wear prediction model, and then obtains health values ​​of the hydraulic components according to the wear prediction values; the hydraulic system status is evaluated according to the health values ​​of the hydraulic components and the obtained health values ​​of the hydraulic system. Compared with the existing method of collecting operating data of hydraulic components by building a test bench, the cost is low, the operability is strong, the difficulty of data collection is reduced, and the reliability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 A flowchart of a method for evaluating a hydraulic system state provided in Embodiment 1 of the present disclosure;

[0060] Figure 2 A schematic diagram of a module of a hydraulic system status evaluation device provided in Example 2 of the present disclosure.

[0061] Figure 3 A schematic diagram of the structure of an electronic device for implementing a method for evaluating a hydraulic system state provided in Example 3 of the present disclosure. DETAILED DESCRIPTION

[0062] The present disclosure is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0063] Prefixes such as "first" and "second" are used in the embodiments of the present disclosure only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0064] In the embodiments of the present disclosure, the collection, storage, use, processing, transmission, provision and disclosure of user personal information involved are in compliance with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0065] Example 1

[0066] Figure 1 A flowchart of a method for evaluating a hydraulic system state provided in Example 1 of the present disclosure is shown in FIG. Figure 1 As shown, the evaluation method includes:

[0067] S1. Establish a wear prediction model for hydraulic components in a hydraulic system based on a three-dimensional fluid simulation model;

[0068] S2, inputting the operation data of the hydraulic component into the wear prediction model to obtain the wear prediction value of the hydraulic component;

[0069] In this embodiment, after the physical product is built according to the hydraulic system in the design simulation stage, in order to effectively monitor the physical hydraulic system, sensors are installed at the input and output ends of the hydraulic elements, and the operating data of the hydraulic elements are collected through the sensors (for example, the pressure, flow, temperature, speed, torque at the inlet and outlet of the hydraulic elements and the force, speed, displacement and other key parameters at the load end), and then the wear prediction model of the hydraulic elements is called to obtain the wear prediction value of each hydraulic element (for example, the wear prediction status of each hydraulic element is obtained).

[0070] In this embodiment, a hydraulic system is built by using professional hydraulic simulation software, wherein hydraulic components simulate the hydraulic actuators in an actual hydraulic system, mechanical components simulate the mechanical actuators in an actual hydraulic system, and signal components simulate the control logic to drive the hydraulic system to work. The parameter configuration of each component is as close as possible to the configuration of the actual hydraulic system to improve the accuracy of the simulation results.

[0071] Furthermore, hydraulic simulation software is used to simulate the operating data of the actual hydraulic system under various working conditions. The power source of the hydraulic system is the driving force of the motor, and the execution result of the hydraulic system is the movement of each actuator. By simulating the actuator load and control strategy under different working conditions and inputting it as signal source data into the hydraulic simulation model, the operation of the hydraulic system under various working conditions can be simulated.

[0072] S3, obtaining the health value of the hydraulic component according to the wear prediction value;

[0073] S4, obtaining the weight value of the influence of the hydraulic component on the efficiency of the hydraulic system;

[0074] S5. Obtaining a health value of the hydraulic system according to the health value and weight value of the hydraulic component;

[0075] S6. Evaluate the hydraulic system status according to the health value of the hydraulic component and the health value of the hydraulic system.

[0076] This embodiment establishes a wear prediction model for hydraulic components in a hydraulic system through a three-dimensional fluid simulation model, obtains wear prediction values ​​of the hydraulic components based on the wear prediction model, and then obtains the health values ​​of the hydraulic components according to the wear prediction values; the hydraulic system status is evaluated according to the health values ​​of the hydraulic components and the obtained health values ​​of the hydraulic system. Compared with the existing method of collecting operating data of hydraulic components by building a test bench, this method has low cost and strong operability, reduces the difficulty of data collection, and improves reliability.

[0077] In an optional embodiment, before step S1, the evaluation method further includes:

[0078] A three-dimensional fluid simulation model of hydraulic components is constructed based on the selection of hydraulic components in the hydraulic system.

[0079] In an optional embodiment, step S3 includes:

[0080] The health value of the hydraulic component is obtained according to the ratio of the wear prediction value to the lower limit value of the wear of the hydraulic component.

[0081] In this embodiment, the wear lower limit value of the hydraulic element represents the wear lower limit value for determining damage to the hydraulic element.

[0082] In an optional embodiment, the operation data includes input parameters and output parameters, and step S4 includes:

[0083] S41, inputting the hydraulic component input parameters and the preset wear value into the three-dimensional fluid simulation model to obtain the output parameters of the hydraulic component under the preset wear value;

[0084] In this embodiment, a three-dimensional fluid mechanics simulation model of the hydraulic element is built according to the selection of the hydraulic element, and the input parameters of the hydraulic element under each working condition obtained by simulation are used as input 1 of the three-dimensional fluid simulation model, and the preset wear values ​​of the parts of the hydraulic element are used as input 2 of the three-dimensional fluid simulation model. The three-dimensional fluid mechanics simulation is performed to obtain the output parameters of the hydraulic element under the preset wear value, and then the wear condition of the input and output mapping of the hydraulic element under different working conditions is obtained. Among them, the input parameters mainly include the key parameters such as pressure, flow, temperature, speed, torque, force, speed, displacement at the load end, etc. at the inlet of each hydraulic element, and the output parameters mainly include the key parameters such as pressure, flow, temperature, speed, torque, force, speed, displacement at the load end, etc. at the outlet of each hydraulic element.

[0085] S42, obtaining output parameters of the hydraulic component under normal conditions;

[0086] S43. Obtain a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system according to a ratio of an output parameter of the hydraulic element under wear to an output parameter of the hydraulic element under normal conditions.

[0087] In this embodiment, the weight value of each hydraulic component of the hydraulic system affecting the efficiency of the hydraulic system is calculated. Since the hydraulic components are located in different positions and have different functions in the hydraulic system, the influence of each hydraulic component on the execution efficiency of the hydraulic system is also different. Through the three-dimensional fluid simulation model of the hydraulic component, the output parameters of the hydraulic component when it is worn can be calculated. Set a unified preset wear value (for example, a reference wear value), select the output parameters of a hydraulic component under the preset wear value to replace the output parameters of the hydraulic component under normal conditions (for example, theoretical conditions) in the hydraulic system simulation software to perform system simulation, calculate the ratio of the output power of the hydraulic system under the preset wear condition and the normal condition, calculate the ratio of the hydraulic system efficiency when all hydraulic components are worn out and under normal conditions in turn, and obtain the weight value of each hydraulic component affecting the efficiency of the hydraulic system after normalization. Among them, the output power of the hydraulic system refers to the sum of the output powers of the end actuators of the hydraulic system. The end actuators generally include hydraulic cylinders and hydraulic motors. The output power of the hydraulic cylinder is P1=Fv / 1000 (F is thrust or pull, unit is N; v is speed, unit is m / s), and the output power of the hydraulic motor is P2=T*2πn (T: torque, unit is Nm, n: speed, unit is rps).

[0088] In an optional embodiment, step S5 includes:

[0089] The health value of the hydraulic system is obtained by taking the weighted average of the health values ​​of the hydraulic components according to the weight values.

[0090] In an optional embodiment, step S6 includes:

[0091] In response to the health value of the hydraulic element being less than or equal to the first preset health value, maintenance prompt information of the hydraulic element is output.

[0092] In this embodiment, the first preset health value is set according to actual conditions and is not specifically limited here.

[0093] In an optional embodiment, step S6 further includes:

[0094] In response to the health value of the hydraulic system being less than or equal to the second preset health value, multiplying the health value of each hydraulic component in the hydraulic system by the corresponding weight value to obtain a health value score of each hydraulic component;

[0095] Sort the health scores of each hydraulic component from low to high;

[0096] The maintenance prompt information of the corresponding hydraulic components is output in the order of health value scores from low to high.

[0097] In this embodiment, the second preset health value is set according to actual conditions and is not specifically limited here.

[0098] In this embodiment, a maintenance strategy for the hydraulic system is formulated. Specifically, with reference to historical maintenance experience, the health value of the hydraulic system and the wear of the hydraulic components, the lower limit of the health value of the hydraulic system and the hydraulic components that triggers maintenance is set. When the health value of the hydraulic component (the hydraulic component can be one or more) is less than or equal to the first preset health value, the corresponding hydraulic component is repaired. When the health value of the hydraulic system is less than or equal to the second preset health value, the health value score of the hydraulic component is obtained by multiplying the current health value of all hydraulic components by the corresponding weight value. The health value scores are arranged in order of maintenance priority from low to high, and the maintenance is carried out in sequence until the health value of the hydraulic system is restored to the normal operating level, thereby avoiding excessive maintenance of hydraulic components and shutdown maintenance for failures.

[0099] It should be noted that the lower limit of the health value for triggering maintenance of the hydraulic system and hydraulic components is set based on manual experience.

[0100] In the specific implementation process, taking the simulation operation and maintenance of a small excavator as an example, for example, the operation process of the simulation operation and maintenance of a small excavator is selected as the implementation case of the disclosure, and the hydraulic system diagram design is completed according to the selection and configuration parameters of the hydraulic system components. The parameter changes of the actual hydraulic system under different working conditions are simulated through the parameter input of the signal component, and the hydraulic component input and output parameter set A of the hydraulic system under different working conditions is obtained;

[0101] Since hydraulic components have different positions and functions in the hydraulic system, each hydraulic component has different effects on the efficiency of the hydraulic system. According to the simulation result data under each working condition, the execution efficiency of each hydraulic component under different working conditions is calculated, and the execution efficiency of the hydraulic system is calculated according to the input of the motor and the output of the load end. The correlation between the execution efficiency of each hydraulic component and the execution efficiency of the hydraulic system can be found through machine learning algorithms, and the weight value of each hydraulic component can be formulated according to the correlation. The weight value can also be manually set according to the empirical value based on the composition and distribution of the hydraulic components in the hydraulic system diagram to obtain the weight value of each hydraulic component on the overall efficiency of the hydraulic system.

[0102] A three-dimensional fluid mechanics simulation model is constructed according to the actual selection of hydraulic components. The simulation model can be established through professional fluid mechanics simulation software. The input parameters of the hydraulic components under various working conditions obtained by simulation are used as input 1 of the three-dimensional fluid simulation model, and the preset wear values ​​of the parts of the hydraulic components are used as input 2 of the three-dimensional fluid simulation model. The output parameters of the hydraulic components are obtained by three-dimensional fluid mechanics simulation, and then the wear conditions of the input-output mapping of the hydraulic components under different working conditions are obtained.

[0103] After the physical product is built according to the hydraulic system in the design simulation phase, in order to effectively monitor the physical hydraulic system, sensors are installed at the input and output ends of the hydraulic components to collect the operating data of the hydraulic components. When the hydraulic system is working, the sensor data is collected in real time and the operating data is uploaded to the service side through the collection gateway. The wear prediction model of the hydraulic components is called to obtain the real-time wear prediction of each hydraulic component.

[0104] The health value of the hydraulic component is obtained according to the ratio of the wear prediction value to the wear lower limit value of the hydraulic component; the health value of each hydraulic component is weighted averaged according to the efficiency weight to obtain the health value of the hydraulic system.

[0105] With reference to historical maintenance experience, the health value of the hydraulic system and the wear of the hydraulic components, the lower limit of the health value of the hydraulic system and the hydraulic components that triggers maintenance is set. When the health value of the hydraulic component is less than or equal to the first preset health value, the corresponding hydraulic component is repaired. When the health value of the hydraulic system is less than or equal to the second preset health value, the health value of each hydraulic component in the hydraulic system is multiplied by the corresponding weight value to obtain the health value score of each hydraulic component, and the maintenance is carried out in order of priority from low to high until the health value of the hydraulic system is restored to the normal operating level.

[0106] This embodiment simulates the hydraulic system for various working conditions according to the characteristics of the hydraulic industry, and obtains the operating data of the hydraulic parts; constructs a three-dimensional fluid simulation model of the hydraulic components, uses the operating data obtained by the hydraulic system simulation as the input of the three-dimensional fluid simulation model, presets the wear parameters of key positions, and calculates the output parameters of the hydraulic components; in the operation and maintenance stage, sensors are installed at the input and output ends of the hydraulic components to collect operating data, and the wear prediction model of the hydraulic components is called to calculate the wear degree of each hydraulic component to construct a health assessment mechanism for the hydraulic components and the hydraulic system and formulate a maintenance strategy. Specifically, a three-dimensional fluid simulation model and a wear prediction model for the hydraulic components and the hydraulic system are constructed through a large amount of simulation data in the hydraulic system design stage, and a large amount of simulation data in the hydraulic system design stage is used to evaluate the hydraulic system status and predict the wear of the hydraulic components in the operation and maintenance stage. Compared with building a test bench to collect equipment operation data, it is less costly and more operable, and shortens the cycle of obtaining the input and output parameters of the hydraulic components; in the equipment operation and maintenance stage, a real-time evaluation of the hydraulic system status is formed by monitoring the hydraulic components and a maintenance plan is generated, which realizes maintenance guidance and refined management of the operation and maintenance process, and avoids excessive maintenance and major failure downtime.

[0107] Example 2

[0108] Corresponding to the aforementioned embodiment of a method for evaluating a hydraulic system state, the present disclosure also provides an embodiment of a device for evaluating a hydraulic system state.

[0109] Figure 2 A schematic diagram of a module of a hydraulic system status evaluation device provided in Embodiment 2 of the present disclosure, such as Figure 2 As shown, the evaluation device includes:

[0110] A first building module 21 is used to establish a wear prediction model of hydraulic components in a hydraulic system according to a three-dimensional fluid simulation model;

[0111] A first acquisition module 22, used for inputting the operation data of the hydraulic element into the wear prediction model to obtain the wear prediction value of the hydraulic element;

[0112] In this embodiment, after the physical product is built according to the hydraulic system in the design simulation stage, in order to effectively monitor the physical hydraulic system, sensors are installed at the input and output ends of the hydraulic elements, and the operating data of the hydraulic elements are collected through the sensors (for example, the pressure, flow, temperature, speed, torque at the inlet and outlet of the hydraulic elements and the force, speed, displacement and other key parameters at the load end), and then the wear prediction model of the hydraulic elements is called to obtain the wear prediction value of each hydraulic element (for example, the wear prediction status of each hydraulic element is obtained).

[0113] In this embodiment, a hydraulic system is built by using professional hydraulic simulation software, wherein hydraulic components simulate the hydraulic actuators in an actual hydraulic system, mechanical components simulate the mechanical actuators in an actual hydraulic system, and signal components simulate the control logic to drive the hydraulic system to work. The parameter configuration of each component is as close as possible to the configuration of the actual hydraulic system to improve the accuracy of the simulation results.

[0114] Furthermore, hydraulic simulation software is used to simulate the operating data of the actual hydraulic system under various working conditions. The power source of the hydraulic system is the driving force of the motor, and the execution result of the hydraulic system is the movement of each actuator. By simulating the actuator load and control strategy under different working conditions and inputting it as signal source data into the hydraulic simulation model, the operation of the hydraulic system under various working conditions can be simulated.

[0115] A second acquisition module 23, used to acquire a health value of the hydraulic element according to the wear prediction value;

[0116] A third acquisition module 24 is used to obtain a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system;

[0117] A fourth acquisition module 25, configured to acquire a health value of the hydraulic system according to the health value and the weight value of the hydraulic element;

[0118] The evaluation module 26 is used to evaluate the hydraulic system status according to the health value of the hydraulic component and the health value of the hydraulic system.

[0119] This embodiment establishes a wear prediction model for hydraulic components in a hydraulic system through a three-dimensional fluid simulation model, obtains wear prediction values ​​of the hydraulic components based on the wear prediction model, and then obtains the health values ​​of the hydraulic components according to the wear prediction values; the hydraulic system status is evaluated according to the health values ​​of the hydraulic components and the obtained health values ​​of the hydraulic system. Compared with the existing method of collecting operating data of hydraulic components by building a test bench, this method has low cost and strong operability, reduces the difficulty of data collection, and improves reliability.

[0120] In an optional embodiment, the evaluation device further comprises:

[0121] The second construction module is used to construct a three-dimensional fluid simulation model of the hydraulic element according to the selection of the hydraulic element in the hydraulic system.

[0122] In an optional embodiment, the second acquisition module is used to obtain the health value of the hydraulic element according to the ratio of the wear prediction value to the wear lower limit value of the hydraulic element;

[0123] In this embodiment, the wear lower limit value of the hydraulic element represents the wear lower limit value for determining damage to the hydraulic element.

[0124] In an optional embodiment, the operation data includes input parameters and output parameters, and the third acquisition module includes:

[0125] A first acquisition unit, used to input the hydraulic element input parameters and the preset wear value into the three-dimensional fluid simulation model to obtain the output parameters of the hydraulic element under the preset wear value;

[0126] In this embodiment, a three-dimensional fluid mechanics simulation model of the hydraulic element is built according to the selection of the hydraulic element, and the input parameters of the hydraulic element under each working condition obtained by simulation are used as input 1 of the three-dimensional fluid simulation model, and the preset wear values ​​of the parts of the hydraulic element are used as input 2 of the three-dimensional fluid simulation model. The three-dimensional fluid mechanics simulation is performed to obtain the output parameters of the hydraulic element under the preset wear value, and then the wear condition of the input and output mapping of the hydraulic element under different working conditions is obtained. Among them, the input parameters mainly include the key parameters such as pressure, flow, temperature, speed, torque, force, speed, displacement at the load end, etc. at the inlet of each hydraulic element, and the output parameters mainly include the key parameters such as pressure, flow, temperature, speed, torque, force, speed, displacement at the load end, etc. at the outlet of each hydraulic element.

[0127] A second acquisition unit is used to acquire output parameters of the hydraulic element under normal conditions;

[0128] The third acquisition unit is used to acquire a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system according to the ratio of the output parameter of the hydraulic element under wear and tear to the output parameter under normal conditions.

[0129] In this embodiment, the weight value of each hydraulic component of the hydraulic system affecting the efficiency of the hydraulic system is calculated. Since the hydraulic components are located in different positions and have different functions in the hydraulic system, the influence of each hydraulic component on the execution efficiency of the hydraulic system is also different. Through the three-dimensional fluid simulation model of the hydraulic component, the output parameters of the hydraulic component when it is worn can be calculated. Set a unified preset wear value (for example, a reference wear value), select the output parameters of a hydraulic component under the preset wear value to replace the output parameters of the hydraulic component under normal conditions (for example, theoretical conditions) in the hydraulic system simulation software to perform system simulation, calculate the ratio of the output power of the hydraulic system under the preset wear condition and the normal condition, calculate the ratio of the hydraulic system efficiency when all hydraulic components are worn out and under normal conditions in turn, and obtain the weight value of each hydraulic component affecting the efficiency of the hydraulic system after normalization. Among them, the output power of the hydraulic system refers to the sum of the output powers of the end actuators of the hydraulic system. The end actuators generally include hydraulic cylinders and hydraulic motors. The output power of the hydraulic cylinder is P1=Fv / 1000 (F is thrust or pull, unit is N; v is speed, unit is m / s), and the output power of the hydraulic motor is P2=T*2πn (T: torque, unit is Nm, n: speed, unit is rps).

[0130] In an optional embodiment, the fourth acquisition module is used to obtain the health value of the hydraulic system by weighted averaging the health values ​​of the hydraulic components according to the weight values.

[0131] In an optional embodiment, the evaluation module includes:

[0132] The first output unit is configured to output maintenance prompt information of the hydraulic element in response to the health value of the hydraulic element being less than or equal to a first preset health value.

[0133] In this embodiment, the first preset health value is set according to actual conditions and is not specifically limited here.

[0134] In an optional embodiment, the evaluation module further includes:

[0135] a fourth acquisition unit, configured to, in response to the health value of the hydraulic system being less than or equal to the second preset health value, multiply the health value of each hydraulic component in the hydraulic system by the corresponding weight value to obtain a health value score of each hydraulic component;

[0136] A sorting unit, used to sort the health value scores of each hydraulic component from low to high;

[0137] The second output unit is used to output maintenance prompt information of the corresponding hydraulic components in order of health value scores from low to high.

[0138] In this embodiment, the second preset health value is set according to actual conditions and is not specifically limited here.

[0139] In this embodiment, a maintenance strategy for the hydraulic system is formulated. Specifically, with reference to historical maintenance experience, the health value of the hydraulic system and the wear of the hydraulic components, the lower limit of the health value of the hydraulic system and the hydraulic components that triggers maintenance is set. When the health value of the hydraulic component (the hydraulic component can be one or more) is less than or equal to the first preset health value, the corresponding hydraulic component is repaired. When the health value of the hydraulic system is less than or equal to the second preset health value, the health value score of the hydraulic component is obtained by multiplying the current health value of all hydraulic components by the corresponding weight value. The health value scores are arranged in order of maintenance priority from low to high, and the maintenance is carried out in sequence until the health value of the hydraulic system is restored to the normal operating level, thereby avoiding excessive maintenance of hydraulic components and shutdown maintenance for failures.

[0140] It should be noted that the lower limit of the health value for triggering maintenance of the hydraulic system and hydraulic components is set based on manual experience.

[0141] In the specific implementation process, taking the simulation operation and maintenance of a small excavator as an example, for example, the operation process of the simulation operation and maintenance of a small excavator is selected as the implementation case of the disclosure, and the hydraulic system diagram design is completed according to the selection and configuration parameters of the hydraulic system components. The parameter changes of the actual hydraulic system under different working conditions are simulated through the parameter input of the signal component, and the hydraulic component input and output parameter set A of the hydraulic system under different working conditions is obtained;

[0142] Since hydraulic components have different positions and functions in the hydraulic system, each hydraulic component has different effects on the efficiency of the hydraulic system. According to the simulation result data under each working condition, the execution efficiency of each hydraulic component under different working conditions is calculated, and the execution efficiency of the hydraulic system is calculated according to the input of the motor and the output of the load end. The correlation between the execution efficiency of each hydraulic component and the execution efficiency of the hydraulic system can be found through machine learning algorithms, and the weight value of each hydraulic component can be formulated according to the correlation. The weight value can also be manually set according to the empirical value based on the composition and distribution of the hydraulic components in the hydraulic system diagram to obtain the weight value of each hydraulic component on the overall efficiency of the hydraulic system.

[0143] A three-dimensional fluid mechanics simulation model is constructed according to the actual selection of hydraulic components. The simulation model can be established through professional fluid mechanics simulation software. The input parameters of the hydraulic components under various working conditions obtained by simulation are used as input 1 of the three-dimensional fluid simulation model, and the preset wear values ​​of the parts of the hydraulic components are used as input 2 of the three-dimensional fluid simulation model. The output parameters of the hydraulic components are obtained by three-dimensional fluid mechanics simulation, and then the wear conditions of the input-output mapping of the hydraulic components under different working conditions are obtained.

[0144] After the physical product is built according to the hydraulic system in the design simulation phase, in order to effectively monitor the physical hydraulic system, sensors are installed at the input and output ends of the hydraulic components to collect the operating data of the hydraulic components. When the hydraulic system is working, the sensor data is collected in real time and the operating data is uploaded to the service side through the collection gateway. The wear prediction model of the hydraulic components is called to obtain the real-time wear prediction of each hydraulic component.

[0145] The health value of the hydraulic component is obtained according to the ratio of the wear prediction value to the wear lower limit value of the hydraulic component; the health value of each hydraulic component is weighted averaged according to the efficiency weight to obtain the health value of the hydraulic system.

[0146] With reference to historical maintenance experience, the health value of the hydraulic system and the wear of the hydraulic components, the lower limit of the health value of the hydraulic system and the hydraulic components that triggers maintenance is set. When the health value of the hydraulic component is less than or equal to the first preset health value, the corresponding hydraulic component is repaired. When the health value of the hydraulic system is less than or equal to the second preset health value, the health value of each hydraulic component in the hydraulic system is multiplied by the corresponding weight value to obtain the health value score of each hydraulic component, and the maintenance is carried out in order of priority from low to high until the health value of the hydraulic system is restored to the normal operating level.

[0147] This embodiment simulates the hydraulic system for various working conditions according to the characteristics of the hydraulic industry, and obtains the operating data of the hydraulic parts; constructs a three-dimensional fluid simulation model of the hydraulic components, uses the operating data obtained by the hydraulic system simulation as the input of the three-dimensional fluid simulation model, presets the wear parameters of key positions, and calculates the output parameters of the hydraulic components; in the operation and maintenance stage, sensors are installed at the input and output ends of the hydraulic components to collect operating data, and the wear prediction model of the hydraulic components is called to calculate the wear degree of each hydraulic component to construct a health assessment mechanism for the hydraulic components and the hydraulic system and formulate a maintenance strategy. Specifically, a three-dimensional fluid simulation model and a wear prediction model for the hydraulic components and the hydraulic system are constructed through a large amount of simulation data in the hydraulic system design stage, and a large amount of simulation data in the hydraulic system design stage is used to evaluate the hydraulic system status and predict the wear of the hydraulic components in the operation and maintenance stage. Compared with building a test bench to collect equipment operation data, it is less costly and more operable, and shortens the cycle of obtaining the input and output parameters of the hydraulic components; in the equipment operation and maintenance stage, a real-time evaluation of the hydraulic system status is formed by monitoring the hydraulic components and a maintenance plan is generated, which realizes maintenance guidance and refined management of the operation and maintenance process, and avoids excessive maintenance and major failure downtime.

[0148] As for the system embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The system embodiment described above is only illustrative, wherein the units described as separate components may or may not be physically separated, and the components as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the disclosed solution.

[0149] Example 3

[0150] Figure 3 This is a schematic diagram of the structure of an electronic device shown in Example 3 of the present disclosure, wherein the electronic device includes a memory, a processor, and a computer program stored in the memory and used to run on the processor, and when the processor executes the computer program, the method for evaluating the hydraulic system status described in any of the above embodiments is implemented. Figure 3 The electronic device 90 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0151] like Figure 3 As shown, the electronic device 90 may be in the form of a general-purpose computing device, for example, it may be a server device. The components of the electronic device 90 may include, but are not limited to: at least one processor 91, at least one memory 92, and a bus 93 connecting different system components (including the memory 92 and the processor 91).

[0152] The bus 93 includes a data bus, an address bus, and a control bus.

[0153] The memory 92 may include a volatile memory, such as a random access memory (RAM) 921 and / or a cache memory 922 , and may further include a read only memory (ROM) 923 .

[0154] The memory 92 may also include a program tool 925 (or utility) having a set (at least one) of program modules 924, such program modules 924 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0155] The processor 91 executes various functional applications and data processing by running the computer program stored in the memory 92, such as the method for evaluating the hydraulic system status provided in any of the above embodiments.

[0156] The electronic device 90 may also communicate with one or more external devices 94 (e.g., keyboards, pointing devices, etc.). Such communication may be performed via an input / output (I / O) interface 95. Furthermore, the electronic device 90 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 96. Figure 3 As shown, the network adapter 96 communicates with other modules of the electronic device 90 via the bus 93. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 90, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.

[0157] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided into multiple units / modules to be embodied.

[0158] Example 4

[0159] Embodiment 4 of the present disclosure further provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the method for evaluating the hydraulic system status provided in any of the above embodiments is implemented.

[0160] The readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device or any suitable combination of the above.

[0161] Example 5

[0162] Embodiment 5 of the present disclosure also provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned methods for evaluating the hydraulic system status.

[0163] Among them, the program code for executing the computer program product of the present disclosure can be written in any combination of one or more programming languages, and the program code can be executed completely on the user device, partially on the user device, as an independent software package, partially on the user device and partially on a remote device, or completely on the remote device.

[0164] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A method for evaluating the state of a hydraulic system, characterized in that: The evaluation methods include: Establish a wear prediction model for hydraulic components in a hydraulic system based on a three-dimensional fluid simulation model; Inputting the operating data of the hydraulic element into the wear prediction model to obtain the wear prediction value of the hydraulic element; Acquire the health value of the hydraulic element according to the wear prediction value; Obtaining a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system; Acquire the health value of the hydraulic system according to the health value of the hydraulic element and the weight value; The hydraulic system state is evaluated according to the health value of the hydraulic component and the health value of the hydraulic system.

2. The method for evaluating the hydraulic system status according to claim 1, characterized in that: Before the step of establishing a wear prediction model for hydraulic components in the hydraulic system according to the three-dimensional fluid simulation model, the evaluation method further includes: A three-dimensional fluid simulation model of hydraulic components is constructed based on the selection of hydraulic components in the hydraulic system.

3. The method for evaluating the hydraulic system status according to claim 1, characterized in that: The step of obtaining the health value of the hydraulic component according to the wear prediction value comprises: Obtaining a health value of the hydraulic element according to a ratio of the wear prediction value to a lower wear limit value of the hydraulic element; and / or, The operation data includes input parameters and output parameters, and the step of obtaining the weight value of the influence of the hydraulic element on the efficiency of the hydraulic system includes: Inputting the hydraulic element input parameters and the preset wear value into the three-dimensional fluid simulation model to obtain the output parameters of the hydraulic element under the preset wear value; Obtaining output parameters of the hydraulic element under normal conditions; A weight value of the influence of the hydraulic element on the efficiency of the hydraulic system is obtained according to a ratio of an output parameter of the hydraulic element under wear conditions to an output parameter of the hydraulic element under normal conditions.

4. The method for evaluating the hydraulic system status according to claim 1, characterized in that: The step of obtaining the health value of the hydraulic system according to the health value of the hydraulic component and the weight value comprises: The health value of the hydraulic system is obtained by weighted averaging the health values ​​of the hydraulic components according to the weight values.

5. The method for evaluating the hydraulic system status according to claim 1, characterized in that: The step of evaluating the state of the hydraulic system according to the health value of the hydraulic element and the health value of the hydraulic system comprises: In response to the health value of the hydraulic component being less than or equal to a first preset health value, maintenance prompt information of the hydraulic component is output.

6. The method for evaluating the hydraulic system status according to claim 1, characterized in that: The step of evaluating the state of the hydraulic system according to the health value of the hydraulic element and the health value of the hydraulic system further comprises: In response to the health value of the hydraulic system being less than or equal to a second preset health value, multiplying the health value of each hydraulic component in the hydraulic system by a corresponding weight value to obtain a health value score of each hydraulic component; The health value scores of the hydraulic components are sorted from low to high; The maintenance prompt information of the corresponding hydraulic components is outputted in the order of the health value scores from low to high.

7. A device for evaluating the state of a hydraulic system, characterized in that: The evaluation device comprises: Establishing a module for establishing a wear prediction model of hydraulic components in a hydraulic system based on a three-dimensional fluid simulation model; A first acquisition module, used for inputting the operation data of the hydraulic element into the wear prediction model to obtain the wear prediction value of the hydraulic element; A second acquisition module, configured to acquire a health value of the hydraulic element according to the wear prediction value; A third acquisition module is used to obtain a weight value of the influence of the hydraulic element on the efficiency of the hydraulic system; a fourth acquisition module, configured to acquire a health value of the hydraulic system according to the health value of the hydraulic element and the weight value; An evaluation module is used to evaluate the state of the hydraulic system according to the health value of the hydraulic element and the health value of the hydraulic system.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and used to run on the processor, characterized in that: When the processor executes the computer program, the method for evaluating the hydraulic system state according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for evaluating the hydraulic system state according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for evaluating the hydraulic system state according to any one of claims 1 to 6 is implemented.

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