Virtual simulation experiment method for schematic diagram design of hydraulic system
Virtual simulation experiments of hydraulic system schematic diagrams using FluidSIM software solve the problem of lack of practical experience in multi-scheme design in traditional teaching. It enables low-cost parallel design and comparison of multiple schemes, cultivates students' engineering decision-making ability, and improves the accuracy and participation of verification.
Patent Information
- Application Number
- CN202511587797.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-03
- Publication Date
- 2026-02-06
AI Technical Summary
Traditional hydraulic system schematic design teaching lacks practical opportunities for parallel design and comparison of multiple schemes, making it difficult to cultivate students' comprehensive evaluation ability for engineering decision-making. Moreover, the verification process is costly, risky, and has limited student participation.
Virtual simulation experiments were conducted using FluidSIM software. Through parallel design and comparison of multiple schemes, the correctness of the hydraulic system schematic diagram was verified, and the direction of oil flow and component action were observed, thereby reducing costs and increasing student participation.
It enables low-cost parallel design and comparison of multiple schemes, cultivates students' engineering decision-making ability, avoids the high cost and high risk of traditional experiments, and enhances students' participation and verification ability.
Smart Images
Figure CN121480045A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a virtual simulation experimental teaching method for hydraulic system schematic design. Specifically, it utilizes the virtual simulation software FluidSIM to design hydraulic system schematics, comparing and designing multiple circuit schemes in parallel to determine the optimal solution for completing the hydraulic system schematic design. Simulation is then used to verify the correctness of the hydraulic system design, thereby cultivating students' ability to select the optimal solution based on engineering requirements to solve complex engineering problems. Background Technology
[0002] Driven by the "China Education Modernization 2035" strategy and the digital transformation strategy of education, higher education is accelerating the iterative upgrading of the "New Engineering" talent training system. With the deep integration of hydraulic transmission technology with electronics, control, and computer technologies, modern industry's demand for mechatronics talents has shifted from single skills to comprehensive abilities to "solve complex engineering problems." However, traditional hydraulic experimental teaching models, due to bottlenecks such as outdated equipment, high safety risks, and insufficient comprehensive training, are difficult to adapt to the needs of industrial intelligent transformation. The Ministry of Education's 2024 "Guiding Opinions on Deepening the Integration of Industry and Education in Engineering Education" clearly states that virtual simulation technology is needed to break through the dilemma of "high cost, high risk, and difficulty in observation" in experimental teaching, providing clear policy guidance for the experimental direction of hydraulic transmission courses.
[0003] Taking the complex engineering problem of hydraulic system schematic design in a hydraulic transmission course as an example, the design process typically involves analyzing the basic functions of the hydraulic system based on design requirements, then designing the basic hydraulic circuits that can perform the specified functions, and finally combining these basic circuits with auxiliary components to form a complete hydraulic system schematic. Currently, this part of the learning is mainly taught through theoretical lectures following these steps, followed by students drawing the hydraulic system schematics themselves. The shortcoming is that this teaching method usually only provides one basic circuit for each specified function, resulting in one hydraulic system schematic, and it does not verify the correctness of the designed hydraulic system schematic.
[0004] The applicant's research revealed that in current hydraulic system schematic design instruction, teachers typically only demonstrate a single standard solution, resulting in students lacking practical opportunities for parallel design and comparison of multiple solutions, and hindering the development of comprehensive evaluation skills required for engineering decision-making. Furthermore, verifying the correctness of hydraulic system schematics in complex engineering projects, if done on physical equipment, requires overcoming challenges such as high equipment costs, high setup risks, limited student participation, and difficulties in observing oil flow direction and component movements.
[0005] Therefore, the "complex engineering problem-solving ability" training objective emphasized in the "Engineering Education Professional Accreditation Standards" urgently needs to achieve a breakthrough in teaching models through technological empowerment. Virtual simulation technology using existing software can provide a low-cost, highly effective, and innovative solution to these problems. Summary of the Invention
[0006] The technical problem to be solved by this invention is to provide a virtual simulation experimental method for hydraulic system schematic design. This method can realize the parallel design and comparison of multiple schemes, verify the correctness of the hydraulic system schematic using FluidSIM software, and observe the oil flow direction and component action during the simulation process, so that every student can participate in the design.
[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical means: A virtual simulation experimental method for designing a hydraulic system schematic diagram includes the following steps: (1) Design the basic circuit according to the design requirements; (2) Oil supply circuit design and simulation; (3) Speed regulation circuit design and simulation; (4) Design and simulation of reversing and rapid motion loops; (5) Design and simulation of speed switching circuit; (6) Drawing the schematic diagram of the hydraulic system; (7) Design and simulation of electromagnet motion control circuit; (8) Experimental evaluation.
[0008] Compared with the prior art, the present invention, which adopts the above technical solution, has the following outstanding features: (1) low cost, and experiments can be carried out with just a computer with the software installed; (2) for experimental teaching of hydraulic system schematic design, it breaks the teaching mode of single standard solution and provides practical opportunities for parallel design and comparison of multiple schemes, so as to cultivate students' comprehensive evaluation ability required for engineering decision-making; (3) it can effectively avoid the problems of high equipment cost, high construction risk, limited student participation, and difficulty in observing oil flow direction and component movement inherent in traditional experiments, and can also conveniently verify the correctness of the designed schematic through simulation.
[0009] Further preferred technical solutions are as follows: Step (1) involves designing the basic circuit according to the design requirements. This means analyzing the basic functions of the designed hydraulic system, such as pressure regulation, reversing, speed regulation, speed switching, and braking. Then, basic hydraulic circuits capable of performing the specified functions are designed sequentially. In the design and simulation experiments for each circuit, a heuristic teaching method is used to guide students to independently choose circuit design schemes. Through comparative analysis of schemes, students understand the applicable conditions and performance characteristics of different circuit design methods, thereby completing the modeling and simulation of the hydraulic system. It is important to emphasize that all alternative schemes provided for each circuit are technically feasible; the focus is on cultivating students' ability to select the optimal scheme based on engineering needs. This experimental teaching design ensures both the mastery of basic knowledge and the development of students' engineering decision-making abilities.
[0010] Step (2) of the oil supply circuit design and simulation adopts a heuristic teaching method to guide students to independently choose circuit design schemes, such as dual-pump oil supply and pressure-limiting variable pump oil supply. Then, the circuit is designed and simulated in the software. The alternative schemes provided for each circuit are technically feasible.
[0011] Step (3) speed control circuit design and simulation employs a heuristic teaching method to guide students in independently selecting circuit design schemes, such as inlet throttling speed control circuits and return throttling speed control circuits. The circuit is then designed and simulated in the software. All alternative schemes provided for each circuit are technically feasible.
[0012] Step (4) involves the design and simulation of the reversing and rapid motion circuit. A heuristic teaching method is used to guide students in independently selecting circuit design schemes, such as a reversing and rapid motion circuit using a three-position five-way solenoid directional valve or a reversing and rapid motion circuit using a three-position four-way solenoid directional valve. The circuit is then designed and simulated in the software. All alternative schemes provided for each circuit are technically feasible.
[0013] Step (5), speed switching circuit design and simulation, employs a heuristic teaching method to guide students in independently selecting circuit design schemes, such as speed switching circuits using limit switches, speed switching circuits using limit valves, and speed switching circuits using pressure relays. The circuit is then designed and simulated in the software. Each alternative circuit is technically feasible.
[0014] The drawing of the hydraulic system schematic diagram in step (6) requires auxiliary components to combine the designs of steps (1)-(5) into a complete hydraulic system schematic diagram after the basic circuit design of steps (1)-(5) is completed. When drawing the hydraulic system schematic diagram, as many redundant components as possible should be removed according to the design requirements and functions, so as to keep the system simple and reduce the number and variety of components. Different basic circuits will result in different hydraulic system schematic diagrams.
[0015] The design and simulation of the electromagnet action control circuit in step (7) is as follows: After the hydraulic system schematic diagram is drawn in step (6), in order to verify the correctness of the schematic diagram, it is necessary to use FluidSIM software to simulate it. The simulation includes the following steps: First, the electromagnet action sequence table of the schematic diagram needs to be designed; then, the hydraulic relay control circuit diagram is drawn. The hydraulic relay control circuit diagram is different for different hydraulic system schematic diagrams; finally, the correctness is verified by simulation.
[0016] The experimental evaluation in step (8) includes: functional evaluation, dynamic performance evaluation, safety and reliability evaluation, and practical evaluation of the designed hydraulic system; among which, the functional evaluation is conducted by assessing the correctness of the action logic of the actuators, whether the electrical control method meets the design requirements, and the integrity of the circuit; the dynamic performance evaluation is conducted by assessing the response characteristics during start-up, reversal, or stop, and the pressure stability during load changes; the safety and reliability evaluation is conducted by assessing whether the overload protection is effective, and whether the protection mechanism is effective during emergency stop or fault simulation; the practical evaluation is conducted by assessing the oil flow direction during simulation, the visualization effect of component state changes, and whether interactive operation is supported for student participation; the above evaluations are completed by reviewing the experimental report and retrieving the CT file of the simulation model. Attached Figure Description
[0017] Figure 1 It is the oil supply circuit design scheme, in which, Figure 1 A is a dual-pump common oil circuit. Figure 1 B is the pressure-limiting change pump oil supply circuit.
[0018] Figure 2 This is a simulation schematic diagram of the fuel supply circuit, in which... Figure 2 A is the simulation schematic diagram of the dual-pump oil supply circuit. Figure 2 B is a simulation schematic diagram of the pressure-limiting change pump oil supply circuit.
[0019] Figure 3 This is a speed control circuit diagram, in which, Figure 3 A is the oil inlet throttling speed control circuit diagram. Figure 2 B is the oil supply circuit diagram for a pressure-limiting change pump.
[0020] Figure 4This is a simulation schematic diagram of the speed control circuit. Figure 4 A is the oil inlet throttling speed control circuit diagram. Figure 4 B is the oil supply circuit diagram for a pressure-limiting change pump.
[0021] Figure 5 This is a commutation circuit design scheme for implementing differential connection; among which, Figure 5 A is a rapid motion circuit using a three-position five-way valve for reversing and differential connection; Figure 5 B is a rapid motion circuit using a three-position four-way valve for reversing and differential connection.
[0022] Figure 6 This is a simulation schematic diagram of the commutation circuit for implementing differential connection; among which, Figure 6 A is a rapid motion circuit using a three-position five-way valve for reversing and differential connection. Figure 5 B is a rapid motion circuit using a three-position four-way valve for reversing and differential connection.
[0023] Figure 7 It is a speed switching circuit design scheme, in which, Figure 7 A is the speed switching circuit controlled by the stroke valve. Figure 7 B is the speed switching circuit controlled by the limit switch. Figure 7 C is the speed switching circuit controlled by the pressure relay.
[0024] Figure 8 This is a simulation schematic diagram of the speed switching circuit, in which... Figure 8 A is a speed switching circuit that uses a five-way valve to control the stroke. Figure 8 B is a speed switching circuit that uses a five-way valve limit switch; Figure 8 C is a relay-controlled speed switching circuit using a five-way valve; Figure 8 D is a speed switching circuit using a four-way valve for stroke control; Figure 8 E uses a four-way valve to control the speed switching circuit. Figure 8 F is a speed switching circuit that uses a four-way valve limit switch.
[0025] Figure 9 It is a schematic diagram of a hydraulic system consisting of dual-pump oil supply, inlet throttling speed regulation, five-way valve reversing, and limit switch speed switching circuit.
[0026] Figure 10 It is a schematic diagram of a hydraulic system consisting of a dual-pump oil supply, an inlet throttling speed regulation circuit, a five-way valve for directional control, and a stroke valve for speed switching.
[0027] Figure 11 It is a schematic diagram of a hydraulic system consisting of dual-pump oil supply, inlet throttling speed regulation, four-way valve reversing, and limit switch speed switching circuit.
[0028] Figure 12It is a schematic diagram of a hydraulic system consisting of a dual-pump oil supply, an inlet throttling speed regulation circuit, a four-way valve for directional control, and a stroke valve for speed switching.
[0029] Figure 13 It is a schematic diagram of a hydraulic system consisting of dual-pump oil supply, return oil throttling speed regulation, five-way valve reversing, and limit switch speed switching circuit.
[0030] Figure 14 It is a schematic diagram of a hydraulic system consisting of a dual-pump oil supply, return oil throttling speed regulation, five-way valve reversing, and stroke valve speed switching circuit.
[0031] Figure 15 It is a schematic diagram of a hydraulic system consisting of dual-pump oil supply, return oil throttling speed regulation, four-way valve reversing, and limit switch speed switching circuit.
[0032] Figure 16 It is a schematic diagram of a hydraulic system consisting of a dual-pump oil supply, return oil throttling speed regulation, four-way valve reversing, and stroke valve speed switching circuit.
[0033] Figure 17 This is a schematic diagram of a combined hydraulic system with variable pump oil supply, inlet throttling speed regulation, five-way valve reversing, and limit switch speed switching circuit.
[0034] Figure 18 This is a schematic diagram of a hydraulic system consisting of a variable pump for oil supply, an inlet throttling speed control, a five-way valve for directional control, and a stroke valve for speed switching.
[0035] Figure 19 This is a schematic diagram of a combined hydraulic system with variable pump oil supply, inlet throttling speed regulation, four-way valve reversing, and limit switch speed switching circuit.
[0036] Figure 20 This is a schematic diagram of a hydraulic system consisting of a variable pump for oil supply, an inlet throttling speed control, a four-way valve for directional control, and a stroke valve for speed switching.
[0037] Figure 21 This is a schematic diagram of a combined hydraulic system with variable pump oil supply, return oil throttling speed regulation, five-way valve reversing, and limit switch speed switching circuit.
[0038] Figure 22 This is a schematic diagram of a hydraulic system consisting of a variable pump for oil supply, a return oil throttling speed regulation circuit, a five-way valve for directional control, and a stroke valve for speed switching.
[0039] Figure 23 This is a schematic diagram of a combined hydraulic system with variable pump oil supply, return oil throttling speed regulation, four-way valve reversing, and limit switch speed switching circuit.
[0040] Figure 24 This is a schematic diagram of a hydraulic system consisting of a variable pump for oil supply, a return oil throttling speed regulation circuit, a four-way valve for directional control, and a stroke valve for speed switching.
[0041] Figure 25 It is the principle of hydraulic system Figure 9 The corresponding hydraulic relay control circuit diagram.
[0042] Figure 26 It is the principle of hydraulic system Figure 10 The corresponding hydraulic relay control circuit diagram.
[0043] Figure 27 It is the principle of hydraulic system Figure 11 The corresponding hydraulic relay control circuit diagram.
[0044] Figure 28 It is the principle of hydraulic system Figure 12 The corresponding hydraulic relay control circuit diagram.
[0045] Figure 29 It is the principle of hydraulic system Figure 13 The corresponding hydraulic relay control circuit diagram.
[0046] Figure 30 It is the principle of hydraulic system Figure 14 The corresponding hydraulic relay control circuit diagram.
[0047] Figure 31 It is the principle of hydraulic system Figure 15 The corresponding hydraulic relay control circuit diagram.
[0048] Figure 32 It is the principle of hydraulic system Figure 16 The corresponding hydraulic relay control circuit diagram.
[0049] Figure 33 It is the principle of hydraulic system Figure 17 The corresponding hydraulic relay control circuit diagram.
[0050] Figure 34 It is the principle of hydraulic system Figure 18 The corresponding hydraulic relay control circuit diagram.
[0051] Figure 35 It is the principle of hydraulic system Figure 19 The corresponding hydraulic relay control circuit diagram.
[0052] Figure 36 It is the principle of hydraulic system Figure 20 The corresponding hydraulic relay control circuit diagram.
[0053] Figure 37 It is the principle of hydraulic system Figure 21 The corresponding hydraulic relay control circuit diagram.
[0054] Figure 38 It is the principle of hydraulic system Figure 22 The corresponding hydraulic relay control circuit diagram.
[0055] Figure 39 It is the principle of hydraulic system Figure 23 The corresponding hydraulic relay control circuit diagram.
[0056] Figure 40 It is the principle of hydraulic system Figure 24 The corresponding hydraulic relay control circuit diagram.
[0057] Figure 41 This is a flowchart of the present invention. Detailed Implementation
[0058] This invention discloses a virtual simulation experiment method for designing a hydraulic system schematic diagram. Using a horizontal multi-axis drilling combination machine tool as a preferred embodiment, a hydraulic system schematic diagram capable of driving the horizontal movement of its power slide is designed. Specific design requirements are as follows: The working cycle of the power slide of the combination machine tool is rapid advance-working advance-rapid return-stop. The hydraulic cylinder loads during rapid advance, working advance, and rapid return are 2000N, 14000N, and 2000N, respectively. The sealing resistance is considered in the mechanical efficiency of the hydraulic cylinder, which is taken as 0.9. The rapid advance and rapid return speeds are equal, both 6 m / min, and the minimum working advance speed is within the range of 0.02 to 0.2 m / min. The rapid advance and working advance strokes are 100 mm and 50 mm, respectively, and the rapid return stroke is 150 mm. The power slide can stop at any position. The design process includes the following steps: Step 1: Design the basic circuit according to the design requirements. This invention discloses a virtual simulation experimental method for designing a hydraulic system schematic diagram. The basic functions to be achieved are as follows: When a horizontal multi-axis drilling machine tool drives a drill bit via a power slide, it should be able to approach the workpiece during rapid advance, with the power slide moving rapidly; during working advance, it should contact the workpiece and drill, with the power slide moving slowly and its speed adjustable; after drilling is completed, it should automatically retract rapidly, with the power slide driving the drill bit back quickly; the power slide should be able to stop at any position. Therefore, to achieve the above-mentioned functions, it is necessary to design basic circuits such as an oil supply circuit, a speed regulation circuit, a reversing circuit, and a rapid motion and speed switching circuit. Because the system's action cycle requires forward rapid advance and working, and reverse rapid retraction, with the rapid advance and retraction speeds being equal, a single-piston rod hydraulic cylinder is selected as the actuator, with differential connection during rapid advance, and the area of the rodless chamber being twice the area of the rod chamber.
[0059] Step 2: Fuel Supply Circuit Design and Simulation After investigation, it was found that the hydraulic system of the power slide of the horizontal multi-axis drilling combination machine tool suitable for this invention typically adopts an open circuit. For the design of the oil supply circuit, a heuristic teaching method is used to guide students to independently choose between a dual-pump oil supply or a pressure-limiting variable pump oil supply design scheme. The dual-pump oil supply scheme should meet the following requirements: both pumps supply oil simultaneously during rapid advance and retraction; during working feed, the high-pressure, low-flow pump supplies oil while the low-pressure, high-flow pump unloads. The variable pump oil supply scheme should meet the following requirements: during rapid advance and retraction, the pump displacement and flow rate are at their maximum; during working feed, the load pressure should be between the variable pump's inflection point pressure and the limit pressure; during working feed, the pump displacement and flow rate automatically decrease. Figure 1 As shown, students are required to design their chosen fuel supply circuit within the dashed box, and then apply it in the FliudSIM software as follows: Figure 2 The circuit was designed and simulated as shown. If it can be made... Figure 2 If the hydraulic cylinder extends, the circuit design is considered correct.
[0060] Step 3: Speed Control Circuit Design and Simulation In this invention, the power slide of the horizontal multi-axis drilling combination machine tool drives the drill bit for drilling. Regardless of whether the hydraulic cylinder is in rapid advance, rapid retraction, or working feed, the hydraulic system must have a speed regulation function to meet design requirements. For the design of the speed regulation circuit, a heuristic teaching method is used to guide students to independently choose between inlet throttling speed regulation or return throttling speed regulation circuit design schemes. The inlet throttling speed regulation circuit scheme should satisfy the following: a flow valve is connected in series between the hydraulic pump and the hydraulic cylinder. The return throttling speed regulation circuit scheme should satisfy the following: a flow valve is connected in series between the hydraulic cylinder and the oil tank. For example... Figure 3 As shown, students are required to design their chosen speed control circuit within the dashed box, and then apply it in the FliudSIM software as follows: Figure 4 The circuit was designed and simulated as shown. If it can be made... Figure 4 If the hydraulic cylinder in the circuit can extend and the extension speed can be controlled, the circuit design is considered correct.
[0061] Step 4: Design and Simulation of Reversing and Rapid Motion Loops After the drill bit completes drilling using the power slide of the horizontal multi-axis drilling combination machine tool in this invention, the drill bit needs to be retracted. To enable this retraction and achieve the reversing function, a reversing circuit needs to be designed. To improve the positional accuracy of the reversing, a fixed stop and a pressure relay for end-of-stroke return control are used. For the design of the reversing circuit, a heuristic teaching method is used to guide students to independently choose between a three-position five-way solenoid valve or a three-position four-way solenoid valve. The reversing circuit using either a three-position five-way or three-position four-way solenoid valve should meet the following requirements: when the reversing valve is in the left position, the hydraulic cylinder piston rod extends, driving the power slide towards the workpiece; after drilling is completed and the fixed stop is encountered, the pressure in the left chamber of the hydraulic cylinder increases, and the pressure relay sends an electrical signal to control the reversing valve to be in the right position, causing the hydraulic cylinder piston rod to retract and drive the power slide away from the workpiece; when the reversing valve is in the middle position, the hydraulic cylinder piston rod remains stationary.
[0062] To ensure the power slide can drive the drill bit close to the workpiece during rapid traverse and maintain equal speeds during both traverse and retraction, a differential connection rapid motion circuit using a single-rod piston cylinder needs to be designed. The designed differential connection rapid motion circuit should meet the following requirements: for circuits using a three-position five-way solenoid valve, differential connection is achieved by connecting the solenoid valve to the circuit in its left position; for circuits using a three-position four-way solenoid valve, differential connection is achieved by adding a two-position three-way solenoid valve to cooperate with the three-position four-way solenoid valve in connecting to the circuit in its left position.
[0063] like Figure 5 As shown, students are required to design their chosen commutator circuit that enables differential connection within the dashed box, and then apply it in the FliudSIM software as follows: Figure 6 The circuit was designed and simulated as shown. If it can be made... Figure 6 If the hydraulic cylinder extends and retracts when the directional valve is connected to the circuit in the left and right positions respectively, and stops moving when connected to the circuit in the middle position, and if the differential connection of the single-rod piston cylinder can be achieved when the directional valve is connected to the circuit in the left position, then the circuit design is considered correct.
[0064] Step 5: Design and Simulation of Speed Switching Circuit In this invention, the power slide of the horizontal multi-axis drilling combination machine tool undergoes a transition from rapid to slow motion during the process of the drill bit approaching and machining the workpiece. This speed transition requires a speed switching circuit. For the design of the speed switching circuit, a heuristic teaching method is used to guide students to independently choose a speed switching circuit design scheme using a stroke valve, a limit switch, or a pressure relay. The speed switching circuit design scheme using a stroke valve should satisfy the following: when the stroke valve is pressed down, the differential connection is disconnected, ending the rapid traverse mode and entering the working feed mode; the speed switching time depends on the moment when the piston rod end stop presses down the stroke valve. The speed switching circuit design scheme using a limit switch should satisfy the following: when the limit switch is pressed down, the differential connection is disconnected, ending the rapid traverse mode and entering the working feed mode; the speed switching time depends on the moment when the piston rod end stop presses down the limit switch. The speed switching circuit design using a pressure relay should meet the following requirements: when the drill bit contacts the workpiece and the load increases, causing the circuit pressure to rise, the differential connection should be disconnected, ending the rapid traverse mode and entering the working mode. The speed switching time depends on when the circuit pressure rises to the set pressure of the pressure relay, and the pressure relay activates and sends an electrical signal. Furthermore, regardless of the speed switching circuit, it should also meet the following requirements: during rapid traverse, the hydraulic cylinder is in a differential connection state; during working mode, the differential connection should be disconnected, and the right chamber of the hydraulic cylinder should be connected to the oil tank.
[0065] like Figure 7 As shown, students are required to design their chosen speed switching circuit within the dashed box, and then apply it in the FliudSIM software as follows: Figure 8 The circuit was designed and simulated as shown. If it can be made... Figure 8 When the hydraulic cylinder extends, the differential connection is first manifested and then the non-differential connection is manifested, and the circuit design is considered correct.
[0066] Step Six: Drawing the Hydraulic System Schematic Diagram After the basic circuits described above are designed, they need to be combined with auxiliary components to form a complete hydraulic system. When drawing the hydraulic system schematic, based on design requirements and functional requirements, as many redundant components as possible should be removed to simplify the system and minimize the number and variety of components. It should be noted that different basic circuits will result in different hydraulic system schematics. As mentioned earlier, there are two design options for the oil supply circuit, speed control circuit, and reversing and rapid motion circuit, and three design options for the speed switching circuit. This allows for 24 possible complete hydraulic system schematics. With two design options each for the oil supply circuit, speed control circuit, reversing and rapid motion circuit, and speed switching circuit, 16 complete hydraulic system schematics can be generated, as shown below. Figures 9-24 The diagrams shown are schematics of complete hydraulic systems that meet design requirements and have been successfully simulated.
[0067] Step 7: Design and Simulation of Electromagnet Action Control Circuit After the hydraulic system schematic is completed, it needs to be simulated using FluidSIM software to verify its correctness. Before simulation, the electromagnet action sequence table of the schematic must first be designed, then the hydraulic relay control circuit diagram must be drawn, and finally, simulation is used to verify its correctness. It should be noted that the hydraulic system schematics drawn will differ, and the hydraulic relay control circuit diagrams will also vary. The hydraulic relay control circuit diagrams corresponding to the 16 complete hydraulic system schematics mentioned earlier are as follows: Figures 25-40 As shown.
[0068] Step 8: Experiment Evaluation The experimental evaluation of this invention includes: functional evaluation, dynamic performance evaluation, safety and reliability evaluation, and practical evaluation of the designed hydraulic system. The functional evaluation assesses the correctness of the actuator logic, whether the electrical control method meets design requirements, and the integrity of the circuit. The dynamic performance evaluation assesses the response characteristics during start-up, reversal, or stop, and the pressure stability under load changes. The safety and reliability evaluation assesses whether overload protection is effective and whether the protection mechanism is effective during emergency stop or fault simulation. The practical evaluation assesses the visualization of oil flow direction and component state changes during simulation, and whether interactive operation is supported to encourage student participation. All these evaluations are completed by reviewing experimental reports and retrieving the CT file of the simulation model.
[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent structural changes made based on the description and drawings of the present invention are included within the scope of the present invention.
Claims
1. A method for virtual simulation experiment of hydraulic system schematic design, characterized in that, It comprises the following steps: (1) confirming the basic circuit to be designed according to the design requirements; (2) oil supply circuit design and simulation; (3) speed regulating circuit design and simulation; (4) reversing and rapid motion circuit design and simulation; (5) speed switching circuit design and simulation; (6) drawing of the hydraulic system schematic diagram; (7) electromagnet action control circuit design and simulation; (8) experimental evaluation.
2. The method for virtual simulation experiment of hydraulic system schematic design according to claim 1, characterized in that: The step (1) comprises the following steps: analyzing the basic functions of the hydraulic system to be designed according to the design requirements, and then designing the hydraulic basic circuits capable of completing the specified functions in sequence.
3. The method for virtual simulation experiment of hydraulic system schematic design according to claim 1, characterized in that: The step (2) comprises the following steps: guiding students to independently select the circuit design scheme, and then designing the circuit in the software and simulating it.
4. The method of claim 1, wherein: The step (3) comprises the following steps: guiding students to independently select the circuit design scheme, and then designing the circuit in the software and simulating it.
5. The method for virtual simulation experiment of hydraulic system schematic design according to claim 1, characterized in that: The step (4) comprises the following steps: guiding students to independently select the circuit design scheme, and then designing the circuit in the software and simulating it.
6. The method for virtual simulation experiment of hydraulic system schematic design according to claim 1, characterized in that: The step (5) comprises the following steps: guiding students to independently select the circuit design scheme, and then designing the circuit in the software and simulating it.
7. The method of claim 1, wherein: The step (6) comprises the following steps: after the basic circuits of steps (1)-(5) are designed, auxiliary elements are used to combine the designs of steps (1)-(5) to form a complete hydraulic system schematic diagram; when drawing the hydraulic system schematic diagram, as many identical redundant elements as possible are removed according to the design requirements and the use functions, and the system is made as simple as possible with a small number of element types and specifications; the basic circuits are different, and the hydraulic system schematic diagrams obtained are also different.
8. The method for virtual simulation experiment of hydraulic system schematic design according to claim 1, characterized in that: The step (7) comprises the following steps: after the step (6) is completed, the correctness of the schematic diagram is verified by simulating it with the FluidSIM software; the simulation comprises the following steps: first, the electromagnet action sequence table of the schematic diagram is designed; then, the hydraulic relay control circuit diagram is drawn; the hydraulic system schematic diagram is different, and the hydraulic relay control circuit diagram is also different; finally, the correctness is verified by simulation.
9. The method for virtual simulation experiment of hydraulic system schematic design according to claim 1, characterized in that: The step (8) comprises the following steps: functional evaluation, dynamic performance evaluation, safety and reliability evaluation, and practicality evaluation of the designed hydraulic system; the functional evaluation is performed by evaluating the correctness of the execution element action logic, whether the electrical control mode meets the design requirements, and the completeness of the circuit; the dynamic performance evaluation is performed by evaluating the response characteristics when starting, reversing or stopping, and the pressure stability when the load changes; the safety and reliability evaluation is performed by evaluating whether the overload protection is effective and whether the protection mechanism is effective when the emergency stop or fault simulation is performed; the practicality evaluation is performed by evaluating the oil flow direction, the visualization effect of the element state change, and the student participation degree when the simulation is performed; the above evaluations are completed by reviewing the experimental report and calling the ct file of the simulation model.