Spring operating mechanism simulation method and system based on hydraulic buffer modeling, terminal equipment and storage medium

Abstract

The invention discloses a spring operating mechanism simulation method and system based on hydraulic buffer modeling, terminal equipment and a storage medium, and belongs to the field of power equipment simulation. The method comprises the following steps: constructing a three-dimensional model of the spring operating mechanism according to moving part structure characteristics, moving part connection relationships and mechanical parameters of each moving part of the spring operating mechanism to be processed; constructing a hydraulic buffer mathematical model according to the mechanical parameters, the structural characteristics of the hydraulic buffer and the element parameters of the hydraulic buffer; performing dynamic simulation on the spring operating mechanism to be processed according to a multi-dynamic simulation model obtained by coupling the three-dimensional model of the spring operating mechanism and the mathematical model of the hydraulic buffer to obtain the motion displacement and the motion speed of the piston rod; updating buffer resistance in the mechanical parameters according to the piston rod movement displacement and the piston rod movement speed; and updating the multi-dynamics simulation model according to the updated buffer resistance. By implementing the method, the problem of low simulation accuracy in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment simulation, and in particular to a spring operating mechanism simulation method and system based on hydraulic buffer modeling, a terminal device, and a storage medium. BACKGROUND

[0002] High-voltage circuit breakers are important protection and control devices in power systems, and the spring operating mechanism of a high-voltage circuit breaker, as a key component for realizing the opening and closing actions of switch contacts, affects the safe and stable operation of the power grid. To achieve smooth opening and closing operations, the spring operating mechanism is usually equipped with a buffer. The design of traditional hydraulic buffers mainly relies on experience and experimental verification, which has problems such as long development cycle, high cost, and difficulty in comprehensively evaluating the impact of various parameter changes on the performance of the spring operating mechanism.

[0003] Currently, multi-body dynamics simulation methods are used to study the spring operating mechanism of circuit breakers, such as using multi-body dynamics simulation software for kinematic analysis of the spring operating mechanism, or using mathematical calculation software to model the hydraulic buffer system. However, most existing methods focus on simulation analysis in a single environment, such as using multi-body dynamics simulation environment alone for simulation, which does not accurately simulate the buffering characteristics of the hydraulic buffer; or using mathematical calculation environment alone for simulation, which has weak relevance to the actual operation rules of the spring operating mechanism. Therefore, the existing methods do not take into account both the fluid dynamics characteristics of the hydraulic buffer system and the motion characteristics of the spring operating mechanism, resulting in low accuracy of spring operating mechanism simulation. SUMMARY

[0004] The embodiments of the present application provide a spring operating mechanism simulation method and system based on hydraulic buffer modeling, a terminal device, and a storage medium, which can effectively solve the problem of low accuracy of spring operating mechanism simulation due to the lack of consideration of both the fluid dynamics characteristics of the hydraulic buffer system and the motion characteristics of the spring operating mechanism in the existing technology.

[0005] An embodiment of the present application provides a spring operating mechanism simulation method based on hydraulic buffer modeling, comprising:

[0006] Obtaining the motion component structure features, motion component connection relationships, and mechanical parameters of each motion component in the spring operating mechanism to be processed; wherein the motion component structure features include hydraulic buffer structure features and hydraulic buffer element parameters;

[0007] Constructing a three-dimensional model of the spring operating mechanism according to the motion component structure features, the motion component connection relationships, and the mechanical parameters;

[0008] According to the mechanical parameters, the hydraulic bumper structure characteristics and the hydraulic bumper element parameters, a hydraulic bumper mathematical model is constructed;

[0009] According to the spring operating mechanism three-dimensional model and the hydraulic bumper mathematical model, coupling is performed to construct a multi-dynamics simulation model;

[0010] According to the multi-dynamics simulation model, dynamics simulation of a spring operating mechanism to be processed is performed to obtain piston rod movement displacement and piston rod movement speed;

[0011] According to the piston rod movement displacement and the piston rod movement speed, the buffer resistance in the mechanical parameters is updated, and the multi-dynamics simulation model is updated according to the updated buffer resistance.

[0012] Further, the movement component structure characteristics include movement component shape, movement component size, movement component position and spring stiffness; the mechanical parameters include movement component friction, spring force and spring pre-tightening force; and the hydraulic bumper structure characteristics include hydraulic bumper size and hydraulic bumper position;

[0013] According to the movement component structure characteristics, the movement component connection relationship and the mechanical parameters, a spring operating mechanism three-dimensional model is constructed, including:

[0014] According to the movement component shape, the movement component size and the movement component position, a frame model of the spring operating mechanism is constructed;

[0015] According to a preset key movement component type, the hydraulic bumper size and the hydraulic bumper position, the frame model of the spring operating mechanism is simplified to obtain a movement body model of the spring operating mechanism;

[0016] According to the movement component connection relationship, movement constraint relationship and movement constraint distribution of the movement component are determined;

[0017] According to the movement constraint relationship and the movement constraint distribution, movement pair constraints are added to each movement component in the movement body model of the spring operating mechanism;

[0018] According to the movement component friction, the spring force, the spring pre-tightening force and the spring stiffness, contact simulation is performed on the movement body model after the movement pair constraints are added to obtain the spring operating mechanism three-dimensional model.

[0019] Further, the mechanical parameters further include hydraulic damping force, moving contact load reaction force, and buffer resistance; and the hydraulic buffer element parameters include: piston rod equivalent mass, piston effective cross-sectional area, damping hole through-flow area, damping hole length-diameter, damping hole pressure difference between two ends, piston diameter, piston width, hydraulic oil density, hydraulic oil dynamic viscosity, and piston-cylinder fitting clearance.

[0020] According to the mechanical parameters, the hydraulic buffer structure characteristics, and the hydraulic buffer element parameters, a hydraulic buffer mathematical model is constructed, including:

[0021] According to the spring force, the hydraulic damping force, the moving component friction force, the moving contact load reaction force, the buffer resistance, the piston rod equivalent mass, and the piston effective cross-sectional area, a piston rod force model of the hydraulic buffer is constructed; wherein the buffer resistance for initially constructing the piston rod force model is a preset external force.

[0022] According to the damping hole length-diameter and a preset flow equation corresponding table, a damping hole flow equation type corresponding to the damping hole length-diameter is determined; wherein the preset flow equation corresponding table represents the corresponding relationship between the damping hole length-diameter and the damping hole flow equation type.

[0023] According to the corresponding damping hole flow equation type, the damping hole through-flow area, the hydraulic oil density, the damping hole pressure difference between two ends, and a preset flow coefficient, a damping hole flow is calculated.

[0024] According to the piston diameter, the piston width, the hydraulic oil density, the hydraulic oil dynamic viscosity, and the piston-cylinder fitting clearance, a gap flow is calculated.

[0025] According to the damping hole flow, the gap flow, and the piston rod force model of the hydraulic buffer, a hydraulic buffer mathematical model is constructed.

[0026] Further, according to the multi-dynamics simulation model, a dynamics simulation of the spring operating mechanism to be processed is performed to obtain piston rod movement displacement and piston rod movement speed, including:

[0027] The current external force is applied to the spring operating mechanism three-dimensional model of the multi-dynamics simulation model, so that the piston rod of the hydraulic buffer of the spring operating mechanism three-dimensional model is simulated to move, and the initial displacement and initial speed of the piston rod during the simulation movement of the piston rod are obtained; wherein the current external force during the first simulation is a preset external force.

[0028] The initial displacement and initial speed of the piston rod are input into the hydraulic buffer mathematical model of the multi-dynamics simulation model, and an initial buffer resistance is calculated.

[0029] The initial buffering resistance is input into the multi-dynamics simulation model to perform dynamics simulation on the spring operating mechanism to be processed to obtain piston rod movement displacement and piston rod movement speed.

[0030] Further, the movement components include an isolated chamber, a connecting rod mechanism, a movable contact, an insulating pull rod, a cam, and a spring.

[0031] Further, the method further comprises:

[0032] According to the updated multi-dynamics simulation model, the operation state of the circuit breaker is evaluated to obtain a circuit breaker operation state evaluation result.

[0033] According to the circuit breaker operation state evaluation result, it is determined whether the circuit breaker meets the actual standard.

[0034] As an improvement of the above-mentioned scheme, another embodiment of the present application provides a spring operating mechanism simulation system based on hydraulic buffer modeling, comprising:

[0035] A data acquisition module is configured to acquire movement component structure features, movement component connection relationships, and mechanical parameters of each movement component in a spring operating mechanism to be processed, wherein the movement component structure features include hydraulic buffer structure features and hydraulic buffer element parameters.

[0036] A three-dimensional model construction module is configured to construct a spring operating mechanism three-dimensional model according to the movement component structure features, the movement component connection relationships, and the mechanical parameters.

[0037] A buffer mathematical model construction module is configured to construct a hydraulic buffer mathematical model according to the mechanical parameters, the hydraulic buffer structure features, and the hydraulic buffer element parameters.

[0038] A multi-dynamics simulation model coupling module is configured to couple the spring operating mechanism three-dimensional model and the hydraulic buffer mathematical model to construct a multi-dynamics simulation model.

[0039] A model simulation module is configured to perform dynamics simulation on the spring operating mechanism to be processed according to the multi-dynamics simulation model to obtain piston rod movement displacement and piston rod movement speed.

[0040] A model updating module is configured to update the buffering resistance in the mechanical parameters according to the piston rod movement displacement and the piston rod movement speed, and update the multi-dynamics simulation model according to the updated buffering resistance.

[0041] Further, the motion component structure features include: motion component shape, motion component size, motion component position and spring stiffness; the mechanical parameters include: motion component friction, spring force and spring pre-tightening force; and the hydraulic buffer structure features include: hydraulic buffer size and hydraulic buffer position.

[0042] The three-dimensional model construction module comprises:

[0043] A frame model construction unit is configured to construct a frame model of the spring-actuated mechanism according to the motion component shape, the motion component size and the motion component position.

[0044] A moving body model construction unit is configured to simplify the frame model of the spring-actuated mechanism according to a preset key motion component type, the hydraulic buffer size and the hydraulic buffer position, to obtain a moving body model of the spring-actuated mechanism.

[0045] A component constraint determination unit is configured to determine a motion constraint relationship and a motion constraint distribution of the motion components according to the motion component connection relationship.

[0046] A component constraint unit is configured to add a motion pair constraint to each motion component in the moving body model of the spring-actuated mechanism according to the motion constraint relationship and the motion constraint distribution.

[0047] A three-dimensional model simulation unit is configured to perform contact simulation on the moving body model with the added motion pair constraint according to the motion component friction, the spring force, the spring pre-tightening force and the spring stiffness, to obtain a three-dimensional model of the spring-actuated mechanism.

[0048] Another embodiment of the present application provides a terminal device, comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and the processor implements a spring-actuated mechanism simulation method based on hydraulic buffer modeling as described in the above embodiments when executing the computer program.

[0049] Another embodiment of the present application provides a computer readable storage medium, comprising a stored computer program, wherein the computer readable storage medium controls a device where the computer readable storage medium is located to execute a spring-actuated mechanism simulation method based on hydraulic buffer modeling as described in the above embodiments when the computer program is running.

[0050] By implementing the present application, at least the following beneficial effects are achieved:

[0051] The application provides a spring operating mechanism simulation method and system based on hydraulic buffer modeling, a terminal device and a storage medium, the method can construct a hydraulic buffer mathematical model based on fluid dynamics characteristics in a hydraulic buffer system according to mechanical parameters, hydraulic buffer structure characteristics and hydraulic buffer element parameters, construct a spring operating mechanism three-dimensional model based on motion characteristics of the spring operating mechanism according to structure characteristics of a motion component, connection relationships of the motion component and mechanical parameters, and then construct a multi-dynamics simulation model by coupling the spring operating mechanism three-dimensional model and the hydraulic buffer mathematical model, so that the motion characteristics and mechanical performance of the hydraulic buffer in the spring operating mechanism of a circuit breaker can be more accurately analyzed, the modeling process of the hydraulic buffer and the influence of the hydraulic buffer on the motion of the spring operating mechanism are highlighted, the fluid dynamics characteristics in the hydraulic buffer system and the motion characteristics of the spring operating mechanism are considered, the split problem of independent solving of a mechanical model and a buffer model in a traditional method is avoided, the dynamic balance relationship that the hydraulic buffer is excited by the motion of the spring operating mechanism and the spring operating mechanism is restricted by the reaction force of the hydraulic buffer is truly reflected, and the simulation accuracy of the spring operating mechanism is improved. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 FIG. 1 is a flowchart of a spring operating mechanism simulation method based on hydraulic buffer modeling according to an embodiment of the application;

[0053] Figure 2 FIG. 2 is a mechanical structure diagram of a hydraulic buffer according to an embodiment of the application;

[0054] Figure 3 FIG. 3 is a force analysis diagram of a piston rod of the hydraulic buffer according to an embodiment of the application;

[0055] Figure 4 FIG. 4 is a flow diagram of a flow at a piston and cylinder body cooperation gap according to an embodiment of the application;

[0056] Figure 5 FIG. 5 is a mathematical model diagram of joint simulation according to an embodiment of the application;

[0057] Figure 6 FIG. 6 is a multi-body dynamics model diagram of a spring operating mechanism according to an embodiment of the application;

[0058] Figure 7 FIG. 7 is a joint simulation flowchart according to an embodiment of the application;

[0059] Figure 8 FIG. 8 is a comparison diagram of a closing motion simulation and an experimental moving contact stroke curve according to an embodiment of the application;

[0060] Figure 9 FIG. 9 is a comparison diagram of an opening motion simulation and an experimental moving contact stroke curve according to an embodiment of the application.

[0061] Figure 10 is a buffer resistance schematic diagram of a closing hydraulic mechanism provided by an embodiment of the present application;

[0062] Figure 11 is a buffer resistance schematic diagram of a closing hydraulic mechanism provided by an embodiment of the present application;

[0063] Figure 12 is a structural schematic diagram of a spring operating mechanism simulation system based on hydraulic buffer modeling provided by an embodiment of the present application. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0065] Reference is made to Figure 1 To solve the problem that the fluid dynamics characteristics in the hydraulic buffer system and the motion characteristics of the spring operating mechanism are not considered in the prior art, resulting in low simulation accuracy of the spring operating mechanism, an embodiment of the present application provides a flowchart of a spring operating mechanism simulation method based on hydraulic buffer modeling, comprising the following steps.

[0066] S1, obtaining motion component structure characteristics, motion component connection relationships and mechanical parameters of each motion component in a spring operating mechanism to be processed; wherein the motion component structure characteristics comprise hydraulic buffer structure characteristics and hydraulic buffer element parameters.

[0067] Specifically, the circuit breaker comprises a spring operating mechanism to be processed, the spring operating mechanism to be processed comprises each motion component and a hydraulic buffer, and the hydraulic buffer comprises a piston and a cylinder. The motion component structure characteristics represent the geometric shape, size parameter, physical structure and key element characteristics of each motion component, and further comprise the hydraulic buffer structure characteristics and the hydraulic buffer element parameters. The hydraulic buffer structure characteristics represent the geometric parameters such as the size and position of the hydraulic buffer in the hydraulic buffer structure, which directly affect the fluid dynamics characteristics; and the hydraulic buffer element parameters represent the mathematical model parameters that determine the buffer resistance. The mechanical structure of the hydraulic buffer is shown in Figure 2 , which defines the size and position of each element in the hydraulic buffer. Figure 2 The maximum outer diameter of the hydraulic buffer body in The outer diameter of the partial cylindrical segment (i.e. the inner diameter of the hydraulic buffer) is In addition to the inner and outer diameter size is all about the damping hole size, damping hole position and damping hole and the reference position of the spacing mark. Motion component connection relationship refers to the constraint mode between components, that is, the type of kinematic pair and the degree of freedom restriction, which determines the motion transmission law of the mechanism. Mechanical parameters represent physical parameters related to force, torque and energy, which are related to the construction of dynamic equation.

[0068] S2, according to the motion component structure characteristics, the motion component connection relationship and the mechanical parameters, constructing a spring actuator three-dimensional model;

[0069] Preferably, the spring actuator three-dimensional model represents a spring actuator virtual prototype model with hydraulic buffer.

[0070] Specifically, the motion component structure characteristics include: motion component shape, motion component size, motion component position and spring stiffness; the mechanical parameters include: motion component friction, spring force and spring pre-tightening force; the hydraulic buffer structure characteristics include: hydraulic buffer size and hydraulic buffer position;

[0071] According to the motion component structure characteristics, the motion component connection relationship and the mechanical parameters, constructing a spring actuator three-dimensional model, comprising:

[0072] According to the motion component shape, the motion component size and the motion component position, constructing a frame model of the spring actuator;

[0073] According to the pre-set key motion component type, the hydraulic buffer size and the hydraulic buffer position, simplifying the frame model of the spring actuator to obtain a motion body model of the spring actuator;

[0074] According to the motion component connection relationship, determining the motion constraint relationship and the motion constraint distribution of the motion component;

[0075] According to the motion constraint relationship and the motion constraint distribution, adding kinematic pair constraint to each motion component in the motion body model of the spring actuator;

[0076] According to the motion component friction, the spring force, the spring pre-tightening force and the spring stiffness, contact simulation is carried out on the motion body model after adding the kinematic pair constraint to obtain the spring actuator three-dimensional model.

[0077] Preferably, the motion component shape, such as a piston rod, is cylindrical, and the motion component size represents the size of the motion component. The motion component position represents the installation coordinates of the motion component in the global coordinate system. The frame model of the spring actuator represents the geometric frame model of the spring actuator. The frame model of the spring actuator is first constructed according to the motion component shape, the motion component size, and the motion component position. The preset key motion component type represents the type of the key motion component selected in advance, such as the type of a moving contact, a connecting rod, a spring, and a hydraulic buffer piston. The hydraulic buffer size represents the size of each component in the hydraulic buffer, including the size of a piston, a cylinder, and a damping hole. The hydraulic buffer position represents the installation coordinates of each component in the mechanism, for example, the hydraulic buffer cylinder is fixed to the rack. The moving body model of the spring actuator represents the model after the non-key motion components are removed and the key motion components are parameterized. Then, the frame model of the spring actuator is simplified to obtain the moving body model of the spring actuator according to the preset key motion component type, the hydraulic buffer size, and the hydraulic buffer position. The motion constraint relationship represents the motion relationship of each motion component, for example, the linear motion of the piston rod, the rotation of the crank about the axis, the multi-angle rotation of the connecting rod, and the like. The motion constraint distribution represents the specific position of the constraint in the model. The motion pair constraint represents the definition of a sliding pair, a rotating pair, a spherical pair, and the like according to the connection relationship, and limits the degree of freedom of the component, such as the constraint of 3 rotation degrees of freedom and 2 translation degrees of freedom of the sliding pair, and only 1 linear motion degree of freedom is reserved. Therefore, after the motion constraint relationship and the motion constraint distribution of the motion component are determined according to the motion component connection relationship, the motion pair constraint of each motion component in the moving body model of the spring actuator is added according to the motion constraint relationship and the motion constraint distribution. The contact simulation and mechanical loading according to the mechanical parameters are the key to constructing the three-dimensional model. The contact simulation represents the setting of friction in the sliding pair or the rotating pair, and outputs accurate loading mechanical parameters, so that the model can reproduce the dynamic behavior of the real actuator, and a three-dimensional model of the spring actuator is constructed. Therefore, finally, the moving body model after adding the motion pair constraint is subjected to contact simulation according to the friction of the motion component, the spring force, the spring pre-tightening force, and the spring stiffness, to obtain a three-dimensional model of the spring actuator.

[0078] In a preferred embodiment of the present invention, firstly, based on the structural design drawings of the 126kV GIS circuit breaker spring operating mechanism, which include parameters such as the shape, size, and position of moving parts, a detailed frame model (a solid model) of the spring operating mechanism is created using 3D modeling software. This model includes components such as the arc-extinguishing chamber, linkage mechanism, spring operating mechanism, and hydraulic buffer. To improve simulation efficiency, the frame model of the spring operating mechanism is simplified by deleting details such as chamfers and threads that have little impact on motion characteristics, and key moving parts, such as the moving contact, linkage, spring, and hydraulic buffer piston rod, are extracted to form the moving body model required for multibody dynamics simulation, i.e., the moving body model of the spring operating mechanism. Then, in the multibody dynamics simulation environment, according to the motion law of the spring operating mechanism, kinematic pair constraints are applied to each moving part based on the motion constraint relationship and distribution. For example, the moving contact, piston rod, and closing spring connector are set as sliding pairs, allowing linear motion. The closing linkage and closing spring connector are set as ball joints, allowing rotation at a certain angle. The central axes of the two crank arms in the stationary contact and spring-operated mechanism, and the two crank arm central axes in the linkage mechanism are set as fixed pairs to restrict relative movement. The remaining moving parts are set as revolute pairs, allowing rotation about fixed axes. For example... Figure 6 As shown, parts 2, 10, and 11 represent the sliding amplitude; parts 1, 4, 5, 6, and 8 represent the fixed joints; part 9 represents the ball joint; and parts 3 and 7 represent 3D contacts. Next, the contacts between the moving parts are simulated, especially the contacts between the cam and the roller, the moving contact, and the insulating tie rod, and appropriate contact friction parameters are set. Finally, the spring connector is set, a spring connector is added, the spring force is simulated, and the spring stiffness and spring preload are set to satisfy Hooke's Law, resulting in a 3D model of the spring-operated mechanism.

[0079] This embodiment covers the three elements of geometry, motion, and mechanics, avoiding simulation deviations caused by data gaps in existing methods. Through hierarchical simplification and parameterization, it balances model accuracy and computational efficiency, making it suitable for industrial-grade multibody dynamics simulation. It also provides a standardized interface for subsequent integration of hydraulic buffer mathematical models (such as the nonlinear relationship between damping force and velocity), supporting multiphysics joint simulation.

[0080] S3. Construct a mathematical model of the hydraulic buffer based on the mechanical parameters, the structural characteristics of the hydraulic buffer, and the parameters of the hydraulic buffer components;

[0081] Preferably, the mathematical model of the hydraulic buffer represents the model of the hydraulic buffer in the spring-operated mechanism to be processed.

[0082] Specifically, the mechanical parameters further include hydraulic damping force, moving contact load reaction force, and buffer resistance; and the hydraulic buffer element parameters include: piston rod equivalent mass, piston effective cross-sectional area, damping hole through-flow area, damping hole length-diameter, damping hole pressure difference between two ends, piston diameter, piston width, hydraulic oil density, hydraulic oil dynamic viscosity, and piston-cylinder fitting clearance.

[0083] According to the mechanical parameters, the hydraulic buffer structure characteristics, and the hydraulic buffer element parameters, a hydraulic buffer mathematical model is constructed, including:

[0084] According to the spring force, the hydraulic damping force, the moving component friction force, the moving contact load reaction force, the buffer resistance, the piston rod equivalent mass, and the piston effective cross-sectional area, a piston rod force model of the hydraulic buffer is constructed; wherein the buffer resistance for initially constructing the piston rod force model is a preset external force.

[0085] According to the damping hole length-diameter and a preset flow equation corresponding table, a damping hole flow equation type corresponding to the damping hole length-diameter is determined; wherein the preset flow equation corresponding table represents the corresponding relationship between the damping hole length-diameter and the damping hole flow equation type.

[0086] According to the corresponding damping hole flow equation type, the damping hole through-flow area, the hydraulic oil density, the damping hole pressure difference between two ends, and a preset flow coefficient, a damping hole flow is calculated.

[0087] According to the piston diameter, the piston width, the hydraulic oil density, the hydraulic oil dynamic viscosity, and the piston-cylinder fitting clearance, a gap flow is calculated.

[0088] According to the damping hole flow, the gap flow, and the piston rod force model of the hydraulic buffer, a hydraulic buffer mathematical model is constructed.

[0089] Specifically, the hydraulic damping force comes from the hydraulic buffer, the viscous resistance generated when the hydraulic oil flows through the damping hole or the gap, which is the core damping mechanism of the buffer, and is different from the simplified linear damping force in the traditional method; the moving contact load reaction force comes from the resistance of the moving contact movement, the reaction force (such as arc repulsion force, contact pressure) received by the moving contact when opening and closing, which directly affects the piston rod movement resistance; the buffer resistance is the external force applied to the spring operating mechanism to simulate movement, which is initially preset and then corrected through simulation iteration. The piston rod equivalent mass is the inertia parameter of the moving component.

[0090] Specifically, the piston rod force model is a specific force representation of the piston in the hydraulic buffer, and the piston rod force model is as follows: Figure 3The preset flow equation corresponding table is selected for the damping hole in the hydraulic buffer, and a proper flow equation is selected, such as a thin-wall small-hole flow equation, a short-hole flow equation or an elongated-hole flow equation. The gap flow represents the gap flow equation established for the matching gap between the piston and the cylinder. First, a piston rod force model of the hydraulic buffer is constructed according to the spring force, the hydraulic damping force, the moving part friction force, the moving contact load reaction force, the buffer resistance, the piston rod equivalent mass and the piston effective cross-sectional area. The buffer resistance for initially constructing the piston rod force model is the preset external force. Then, the damping hole length-diameter corresponding flow equation type of the damping hole length-diameter is determined according to the damping hole length-diameter and the preset flow equation corresponding table. The preset flow equation corresponding table represents the corresponding relationship between the damping hole length-diameter and the damping hole flow equation type. Next, the damping hole flow is calculated according to the corresponding damping hole flow equation type, the damping hole through-flow area, the hydraulic oil density, the pressure difference between the two ends of the damping hole and the preset flow coefficient. Then, the gap flow is calculated according to the piston diameter, the piston width, the hydraulic oil density, the hydraulic oil dynamic viscosity and the matching gap between the piston and the cylinder. According to the flow continuity principle, a flow continuity equation of the hydraulic cylinder is established to associate the volume change of the inflowing and outflowing oil with the movement displacement of the piston. Finally, a hydraulic buffer mathematical model is constructed according to the damping hole flow, the gap flow and the piston rod force model of the hydraulic buffer.

[0091] In a preferred embodiment of the present application, a piston rod force model is established according to the structural features and working principle of the hydraulic buffer. The spring force (from the spring operating mechanism), the hydraulic damping force (from the hydraulic buffer), the moving part friction force (from the friction between the moving parts) and the moving contact load reaction force (from the resistance of the moving contact) are mainly considered, and the mass of the piston rod is ignored. The hydraulic damping force is the key part of the model. Figure 3 As shown in the figure, the piston rod force model is:

[0092]

[0093] wherein m is the equivalent mass of the circuit breaker and its transmission parts reduced to the piston rod, i.e. the piston rod equivalent mass; v is the piston rod movement speed; t is time; p1 is the cylinder inner cavity pressure; A1 is the piston effective cross-sectional area contacting the hydraulic oil in the cylinder inner cavity; p2 is the cylinder outer cavity pressure; A2 is the piston effective cross-sectional area contacting the hydraulic oil in the cylinder outer cavity; F f is the friction force between the piston and the cylinder and the friction force between the hydraulic oil and the damping hole; F t is the opening spring force; F b is the equivalent force of the circuit breaker and its transmission parts reduced to the piston rod, such as Figure 3The schematic diagram of each force is shown. In the formula, the part of -p1A1+p2A2 is the hydraulic damping force (or called hydraulic buffer force). For the damping hole in the hydraulic buffer, according to the length-diameter ratio of the damping hole, a suitable flow equation is selected, such as the thin-walled small hole flow equation, the short hole flow equation or the slender hole flow equation; for example, when the length-diameter ratio of the damping hole is small, the thin-walled small hole flow equation is adopted:

[0094]

[0095] Wherein, q1 is the flow through the damping hole; C is the flow coefficient; A c is the damping hole flow area; p is the hydraulic oil density; and Ap is the pressure difference at both ends of the damping hole.

[0096] For the fitting gap between the piston and the cylinder, a gap flow equation is established, which describes the flow characteristics of the hydraulic oil in the gap between the piston and the cylinder:

[0097]

[0098] Wherein, q2 is the gap flow; D is the piston diameter; L is the piston width; p is the hydraulic oil density; d is the fitting gap between the piston and the cylinder; m is the dynamic viscosity of the hydraulic oil; and v is the piston moving speed. The flow schematic diagram of the fitting gap between the piston and the cylinder is shown in Figure 4 .

[0099] According to the flow continuity principle, the flow continuity equation of the hydraulic cylinder is established, which relates the volume change of the inflow and outflow oil to the movement displacement of the piston:

[0100] A1Dx=(q1+q2)D

[0101] In the formula, D is the stroke of the piston rod within the time D; A1 is the effective area of the hydraulic cylinder piston; and dx / dt is the movement speed of the piston rod, which relates the inflow and outflow of the hydraulic oil to the movement of the piston rod. Finally, according to the above fluid formula dynamics formula, the mathematical model of the hydraulic buffer is built, covering the damping hole throttling, gap flow, inertial force, viscous force and other physical mechanisms. Through the flow state adaptive switching and gap flow modeling, the change law of the damping force with the speed and pressure is accurately described, which supports real-time simulation and fault prediction.

[0102] S4, coupling according to the spring operating mechanism three-dimensional model and the hydraulic buffer mathematical model, constructing a multi-dynamics simulation model;

[0103] Specifically, the spring operating mechanism three-dimensional model mainly focuses on describing the geometry, size, position of each moving part in the mechanism, as well as the connection relationship and motion constraint therebetween, and can intuitively show the mechanical motion characteristics of the mechanism. The hydraulic buffer mathematical model focuses on the fluid dynamics characteristics inside the hydraulic buffer, such as the damping hole flow, the gap flow, the hydraulic damping force, etc. In the actual operation process of the spring operating mechanism, the motion of the spring operating mechanism and the buffering effect of the hydraulic buffer are mutually influenced and restricted. For example, the motion of the spring operating mechanism provides input (the motion of the piston rod) for the hydraulic buffer, and the damping force generated by the hydraulic buffer in turn affects the motion of the spring operating mechanism. Therefore, neither the spring operating mechanism three-dimensional model nor the hydraulic buffer mathematical model can completely and accurately describe the dynamic behavior of the whole system, and the two must be coupled to build a multi-dynamics simulation model that can truly reflect the actual operation of the system. The piston rod motion in the spring operating mechanism three-dimensional model is an important input of the hydraulic buffer mathematical model, as shown in the following formula: Figure 5 As shown in the figure, the circular dashed box is a linkage module, which is a data interaction interface of numerical calculation and dynamics simulation, receives the data output by the dynamics simulation, such as the displacement X(t) and the velocity v of the buffer piston; drives the calculation of the damping hole area S(x), which can calculate the damping hole flow area (i.e. A c ) in real time according to the displacement X(t) and the velocity v of the piston; combines q1 and q2 to obtain the buffer resistance F(t). The buffer resistance F(t) output by the numerical calculation according to the fluid continuity equation is fed back to the multi-dynamics simulation model, so that the multi-dynamics simulation model corrects the motion, and the cycle iteration simulates the real buffering process. That is, in the coupling process, the displacement, velocity and other motion parameters of the piston rod in the spring operating mechanism three-dimensional model are transmitted to the hydraulic buffer mathematical model. For example, the velocity of the piston rod will affect the flow and gap flow of the damping hole in the hydraulic buffer, and then affect the size of the hydraulic damping force. The hydraulic damping force and the buffer resistance calculated by the hydraulic buffer mathematical model are fed back to the spring operating mechanism three-dimensional model as external forces. These forces will affect the force conditions of each moving part in the spring operating mechanism, thereby changing their motion states. For example, the damping force generated by the hydraulic buffer will hinder the motion of the piston rod, so that the acceleration and velocity of the piston rod change.

[0104] S5, performing dynamics simulation on the spring operating mechanism to be processed according to the multi-dynamics simulation model, to obtain the motion displacement of the piston rod and the motion velocity of the piston rod;

[0105] Specifically, performing dynamics simulation on the spring operating mechanism to be processed according to the multi-dynamics simulation model to obtain the motion displacement of the piston rod and the motion velocity of the piston rod, comprising:

[0106] The current external force is applied to the spring operating mechanism three-dimensional model of the multi-dynamics simulation model, so that the piston rod of the hydraulic buffer of the spring operating mechanism three-dimensional model is simulated to move, and the initial displacement and initial speed of the piston rod at the time of the simulated movement of the piston rod are obtained; wherein the current external force at the first simulation is a preset external force;

[0107] The initial displacement and initial speed of the piston rod are input into the mathematical model of the hydraulic buffer of the multi-dynamics simulation model, and an initial buffer resistance is calculated;

[0108] The initial buffer resistance is input into the multi-dynamics simulation model, and dynamics simulation is performed on the spring operating mechanism to be processed, so as to obtain the movement displacement and movement speed of the piston rod.

[0109] Preferably, the movement of the spring operating mechanism is driven by an external force, such as the elastic force of a closing spring. At the beginning of the simulation, an initial driving force, that is, an external force, needs to be given to the system. At the first simulation, a preset external force is used since there is no previous simulation result as a reference. The preset value is usually obtained according to design experience or theoretical calculation. After the external force is applied to the spring operating mechanism three-dimensional model, according to Newton's law of mechanics, the components in the mechanism will produce corresponding movement, and the piston rod of the hydraulic buffer will also start to move. At this time, the initial displacement and initial speed of the piston rod are recorded, and the two parameters are the basis for subsequent calculation, which reflect the state of the piston rod at the starting moment of the movement.

[0110] The initial displacement and velocity of the piston rod are input into the mathematical model of the hydraulic damper in the multi-dynamic simulation model, and the initial buffer resistance is calculated through this model. The function of the hydraulic damper is to provide buffering force during the movement of the spring-operated mechanism to slow down the movement speed of the piston rod and prevent the mechanism from being subjected to excessive impact. The magnitude of the buffer resistance is closely related to the movement state of the piston rod; for example, the faster the piston rod speed, the greater the buffer resistance is usually. The mathematical model of the hydraulic damper is established based on the principles of fluid mechanics, which describes the relationship between the flow and pressure changes of hydraulic oil inside the damper and the movement of the piston rod. By substituting the initial displacement and initial velocity of the piston rod into this model, the buffer resistance generated by the hydraulic damper in this initial state can be calculated. The calculated initial buffer resistance is input into the multi-dynamic simulation model to perform a dynamic simulation of the entire spring-operated mechanism, and finally obtains the movement displacement and velocity of the piston rod. From applying an external force to obtaining the initial state of the piston rod, to calculating the buffer resistance, and finally obtaining the movement displacement and velocity of the piston rod, the entire process simulates the dynamic behavior of the spring-operated mechanism in actual operation. It can accurately predict the movement of the piston rod, providing an important basis for the design and optimization of the spring-operated mechanism. For example, the spring stiffness and the parameters of the hydraulic damper can be adjusted based on the simulation results to achieve better performance and reliability.

[0111] In a preferred embodiment of the present invention, in the multibody dynamics simulation environment, the displacement x and velocity dx / dt of the piston rod are defined as output variables. In the hydraulic buffer mathematical model, a function or module is created to receive the piston rod displacement x and velocity dx / dt output by the multibody dynamics simulation environment. Inside the function or module, the buffer resistance F_buffer is calculated based on the established hydraulic buffer mathematical model. The calculated F_buffer is output to the multibody dynamics simulation model. The F_buffer calculated by the hydraulic buffer mathematical model is applied as an external load force to the moving body of the piston rod in the multibody dynamics simulation environment through an interface. A joint simulation of the multibody dynamics simulation environment and the mathematical calculation environment is run to obtain the motion characteristics of the spring-operated mechanism and the working state of the hydraulic buffer, such as the displacement, velocity, acceleration of the moving contact, and pressure changes within the hydraulic buffer, ensuring data synchronization between the multibody dynamics simulation environment and the mathematical calculation environment using time-step synchronization or event-triggered synchronization.

[0112] S6. Update the buffer resistance in the mechanical parameters according to the piston rod displacement and piston rod velocity; and update the multi-dynamic simulation model according to the updated buffer resistance.

[0113] Specifically, the multi-dynamics simulation model is a model that comprehensively considers mechanical movement of the spring operating mechanism and fluid dynamics characteristics of the hydraulic buffer. The updated buffer resistance is fed back to the model as an important mechanical parameter. Specifically, the buffer resistance value originally used is replaced by the updated new value in the dynamic equation of the spring operating mechanism. After updating the buffer resistance, the parameters of the dynamic equation in the multi-dynamics simulation model change. At this time, the equation set needs to be solved again, and an iterative algorithm is used to continuously update the movement state of each moving part until the solution of the equation set converges. In this process, the model considers the influence of the updated buffer resistance on the movement of the spring operating mechanism, and re-calculates the movement displacement and speed of the piston rod and other parameters.

[0114] In a preferred embodiment of the present application, as shown in Figure 7 The virtual prototype, i.e., the three-dimensional model of the spring operating mechanism, is constructed by first defining the kinematic pairs, setting the contact of the moving bodies, adding the spring connector, and adding the damping. Then, the movement displacement x and the movement speed v of the piston rod of the hydraulic buffer are taken as output variables and are transmitted to the mathematical model of the hydraulic buffer. At the initial time when the mathematical model of the hydraulic buffer does not receive the movement displacement x and the movement speed v, the damping hole flow rate q1 and the gap flow rate q2 are calculated according to the pre-set initial displacement and initial speed, the initial buffer resistance is obtained, and then the initial buffer resistance can act on the three-dimensional model of the spring operating mechanism to perform simulation movement, obtain new movement displacement and movement speed, and then update the multi-dynamics simulation model coupled by the three-dimensional model of the spring operating mechanism and the mathematical model of the hydraulic buffer. The simulation of the spring operating mechanism is realized.

[0115] Preferably, the moving parts include the arcing chamber, the connecting rod mechanism, the movable contact, the insulating pull rod, the cam, and the spring.

[0116] Preferably, the method further comprises:

[0117] According to the updated multi-dynamics simulation model, the running state of the circuit breaker is evaluated to obtain a circuit breaker running state evaluation result.

[0118] According to the circuit breaker running state evaluation result, it is determined whether the circuit breaker meets the actual standard.

[0119] In a preferred embodiment of the present application, the circuit breaker is a key device for ensuring the safe and stable operation of the power system in the power grid, and its running state directly affects the reliability of the power grid. The spring operating mechanism, as an important component of the circuit breaker, its dynamic performance will significantly affect the opening and closing action of the circuit breaker. The updated multi-dynamics simulation model comprehensively considers the mechanical movement of the spring operating mechanism and the fluid dynamics characteristics of the hydraulic buffer, and through real-time updating of parameters such as buffer resistance, it can more accurately simulate the actual running state of the spring operating mechanism. As shown inFigure 8 As shown in the figure, the slightly darker line is the travel curve of the moving contact in the opening experiment, and the slightly lighter line is the travel curve of the moving contact in the opening simulation. The simulation method can better simulate the state of the moving contact in the opening state. As shown in the figure, Figure 9 As shown in the figure, the black line is the travel curve of the moving contact in the closing experiment, and the red line is the travel curve of the moving contact in the closing simulation. The simulation method can better simulate the state of the moving contact in the closing state. Therefore, based on the multi-dynamics simulation model, the operating state of the circuit breaker can be evaluated, and then it can be judged whether the circuit breaker meets the actual operation standard and the actual setting standard.

[0120] Through the updated multi-dynamics simulation model, the motion displacement and velocity of the piston rod over time can be accurately calculated. According to these curves, the opening and closing times of the circuit breaker can be determined. The opening and closing times are important indicators of circuit breaker performance. If the opening and closing times are too long or too short, it may cause the circuit breaker to fail to cut off or connect the circuit in time, thereby affecting the safe operation of the power grid. The multi-dynamics simulation model can also simulate the motion trajectory, velocity and acceleration of the circuit breaker contact. The motion characteristics of the contact are directly related to the contact and separation process of the contact. Good contact motion characteristics can ensure reliable contact of the contact, reduce the generation of arc, and prolong the service life of the contact. If there are abnormalities in the contact motion process, such as too fast or too slow speed, unstable motion, etc., it may cause the contact to wear out, poor contact, etc. The multi-dynamics simulation model can calculate the force of each component in the spring operating mechanism, including spring force, friction force, buffer resistance, etc. As shown in the figure, Figure 10 As shown in the figure, is a schematic diagram of the buffer resistance in the opening state. As shown in the figure, Figure 11 As shown in the figure, is a schematic diagram of the buffer resistance in the closing state. By analyzing these force conditions, it can be determined whether the mechanism has problems such as overload, jamming, etc. For example, if the force borne by a certain component exceeds its designed bearing capacity, it may cause damage to the component and affect the normal operation of the circuit breaker. By integrating the above evaluation indicators, the operating state evaluation result of the circuit breaker can be obtained to more intuitively understand the operating state of the circuit breaker. The power grid is a complex power system composed of numerous power generation, transmission, transformation and distribution equipment. The circuit breaker plays a control and protection role in the power grid. When the power grid fails, the circuit breaker can quickly cut off the circuit to prevent the failure from expanding. Therefore, the operating state of the circuit breaker directly reflects the local operating condition of the power grid.

[0121] The circuit breaker spring operating mechanism is a complex electro-mechanical-hydraulic coupling system, and its motion characteristics are affected by multiple factors, including mechanical motion, hydraulic damping, friction, spring force, etc. The existing method is difficult to realize the coupling simulation of these multiple physical fields, so it cannot comprehensively evaluate the overall performance of the hydraulic buffer in the spring operating mechanism. Especially in the modeling of the hydraulic buffer, the flow characteristics of the damping hole and the matching gap are not simulated finely. The embodiment can more truly reflect the motion law of the hydraulic buffer by establishing an accurate mathematical model of the hydraulic buffer, considering the flow characteristics of the damping hole and the matching gap, and significantly improving the modeling accuracy of the hydraulic buffer. Through the joint simulation of the multi-body dynamics simulation environment and the mathematical calculation environment, the coupling of mechanical motion and hydraulic damping is realized, and the overall performance of the hydraulic buffer in the spring operating mechanism can be more comprehensively analyzed. The simulation can be quickly performed without parameter analysis and optimization design, which shortens the research and development cycle, reduces the experimental cost, and improves the analysis efficiency. The method proposed in the application can be flexibly applied to the analysis of the hydraulic buffer in the spring operating mechanism of different types and specifications of circuit breakers.

[0122] By implementing the embodiment, the fluid dynamics characteristics in the hydraulic buffer system are considered, the mathematical model of the hydraulic buffer is constructed according to the mechanical parameters, the structural characteristics of the hydraulic buffer, and the element parameters of the hydraulic buffer, the motion characteristics of the spring operating mechanism are considered, the three-dimensional model of the spring operating mechanism is constructed according to the structural characteristics of the moving parts, the connection relationship of the moving parts, and the mechanical parameters, and then the multi-dynamics simulation model is coupled and constructed according to the three-dimensional model of the spring operating mechanism and the mathematical model of the hydraulic buffer. The motion characteristics and mechanical performance of the hydraulic buffer in the circuit breaker spring operating mechanism can be more accurately analyzed, the modeling process of the hydraulic buffer and its influence on the motion of the spring operating mechanism are highlighted, the fluid dynamics characteristics in the hydraulic buffer system and the motion characteristics of the spring operating mechanism are considered, the fragmentation problem of independent solving of the mechanical model and the buffer model in the traditional method is avoided, the dynamic balance relationship that the spring operating mechanism is excited by the motion of the hydraulic buffer and the hydraulic buffer is restricted by the motion of the spring operating mechanism is truly reflected, and the simulation accuracy of the spring operating mechanism is improved.

[0123] Referring to Figure 12 , the embodiment provided by the application is a kind of based on the structure diagram of spring operating mechanism simulation system of hydraulic buffer modeling, including:

[0124] The data acquisition module is used to acquire the motion characteristics of each moving part in the spring operating mechanism to be processed, the connection relationship of the moving parts and the mechanical parameters; wherein the motion characteristics include: the structural characteristics of the hydraulic buffer and the element parameters of the hydraulic buffer;

[0125] a three-dimensional model construction module, configured to construct a spring operating mechanism three-dimensional model according to the kinematic component structure features, the kinematic component connection relationship, and the mechanical parameters;

[0126] a buffer mathematical model construction module, configured to construct a hydraulic buffer mathematical model according to the mechanical parameters, the hydraulic buffer structure features, and the hydraulic buffer element parameters;

[0127] a multi-dynamics simulation model coupling module, configured to couple the spring operating mechanism three-dimensional model and the hydraulic buffer mathematical model to construct a multi-dynamics simulation model;

[0128] a model simulation module, configured to perform dynamics simulation and modeling on a spring operating mechanism to be processed according to the multi-dynamics simulation model, so as to obtain piston rod movement displacement and piston rod movement speed;

[0129] a model updating module, configured to update the buffer resistance in the mechanical parameters according to the piston rod movement displacement and the piston rod movement speed, and update the multi-dynamics simulation model according to the updated buffer resistance.

[0130] Preferably, the kinematic component structure features include kinematic component shape, kinematic component size, kinematic component position, and spring stiffness; the mechanical parameters include kinematic component friction, spring acting force, and spring pre-tightening force; and the hydraulic buffer structure features include hydraulic buffer size and hydraulic buffer position.

[0131] The three-dimensional model construction module includes:

[0132] a frame model construction unit, configured to construct a frame model of the spring operating mechanism according to the kinematic component shape, the kinematic component size, and the kinematic component position;

[0133] a moving body model construction unit, configured to simplify the frame model of the spring operating mechanism according to a preset key kinematic component type, the hydraulic buffer size, and the hydraulic buffer position, to obtain a moving body model of the spring operating mechanism;

[0134] a component constraint determination unit, configured to determine kinematic constraint relationship and kinematic constraint distribution of the kinematic components according to the kinematic component connection relationship;

[0135] a component constraint unit, configured to add kinematic pair constraint to each kinematic component in the moving body model of the spring operating mechanism according to the kinematic constraint relationship and the kinematic constraint distribution;

[0136] The three-dimensional model simulation unit is used for contact simulation of the kinematic body model after adding kinematic pair constraints according to the friction of the moving part, the spring acting force, the spring pre-tightening force and spring stiffness, so as to obtain the spring operating mechanism three-dimensional model.

[0137] The application provides a spring operating mechanism simulation system based on hydraulic buffer modeling, wherein a data acquisition module is used to acquire the kinematic part structure features, kinematic part connection relationships and mechanical parameters of each kinematic part in a spring operating mechanism to be processed, wherein the kinematic part structure features include hydraulic buffer structure features and hydraulic buffer element parameters; a three-dimensional model construction module is used to construct a spring operating mechanism three-dimensional model according to the kinematic part structure features, the kinematic part connection relationships and the mechanical parameters; a buffer mathematical model construction module is used to construct a hydraulic buffer mathematical model according to the mechanical parameters, the hydraulic buffer structure features and the hydraulic buffer element parameters; a multi-dynamics simulation model coupling module is used to couple the spring operating mechanism three-dimensional model and the hydraulic buffer mathematical model to construct a multi-dynamics simulation model; a model simulation module is used to perform dynamics simulation and modeling on the spring operating mechanism to be processed according to the multi-dynamics simulation model, so as to obtain piston rod movement displacement and piston rod movement speed; and finally, a model updating module is used to update the buffer resistance in the mechanical parameters according to the piston rod movement displacement and the piston rod movement speed, and to update the multi-dynamics simulation model according to the updated buffer resistance.

[0138] The application can construct a hydraulic buffer mathematical model according to the mechanical parameters, the hydraulic buffer structure features and the hydraulic buffer element parameters by considering the fluid dynamics characteristics in the hydraulic buffer system, can construct a spring operating mechanism three-dimensional model according to the kinematic part structure features, the kinematic part connection relationships and the mechanical parameters by considering the motion characteristics of the spring operating mechanism, and can then couple the spring operating mechanism three-dimensional model and the hydraulic buffer mathematical model to construct a multi-dynamics simulation model, so as to more accurately analyze the motion characteristics and mechanical properties of the hydraulic buffer in the spring operating mechanism of the circuit breaker, highlight the modeling process of the hydraulic buffer and the influence of the hydraulic buffer on the motion of the spring operating mechanism, consider the fluid dynamics characteristics in the hydraulic buffer system and the motion characteristics of the spring operating mechanism, avoid the fragmentation problem of independent solution of the mechanical model and the buffer model in the traditional method, truly reflect the dynamic balance relationship that the motion of the spring operating mechanism excites the response of the hydraulic buffer and the reaction force of the hydraulic buffer restricts the motion of the spring operating mechanism, and improve the simulation accuracy of the spring operating mechanism.

[0139] It should be noted that the apparatus embodiments described above are merely illustrative, and the units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. In addition, the connection relationship between the modules in the apparatus embodiments provided by the present application indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative labor.

[0140] Those skilled in the art can clearly understand that, for the convenience and brevity, the specific working process of the above-described apparatus can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0141] Another embodiment of the present application also provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements a spring operating mechanism simulation method based on hydraulic buffer modeling as described in the above embodiments when executing the computer program. The terminal device can be a desktop computer, a notebook computer, a palm computer, a cloud server, and other computing devices. The terminal device can include, but is not limited to, a processor and a memory.

[0142] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and connects all parts of the terminal device through various interfaces and lines.

[0143] The memory can be used to store the computer program, and the processor realizes various functions of the terminal device by running or executing the computer program stored in the memory and calling data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function, and the like; and the data storage area can store data created according to the use of the mobile phone and the like. In addition, the memory can include a high-speed random access memory, and can also include a nonvolatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state memory device.

[0144] Another embodiment of the present application provides a computer readable storage medium, comprising a stored computer program, wherein the computer readable storage medium controls a device where the computer readable storage medium is located to perform the spring operating mechanism simulation method based on hydraulic buffer modeling according to the above-mentioned embodiments when the computer program is running.

[0145] The storage medium is a computer readable storage medium, and the computer program is stored in the computer readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment described above can be realized. The computer program includes computer program code, which can be in the form of source code, object code, an executable file, or some intermediate form, etc. The computer readable medium can include any entity or device capable of carrying the computer program code, a recording medium, a U disk, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0146] The above is the preferred embodiment of the present application. It should be noted that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered within the protection scope of the present application.

Claims

1. A simulation method for a spring-operated mechanism based on hydraulic buffer modeling, characterized in that, include: Obtain the structural features of each moving part in the spring operating mechanism to be processed, the connection relationship of the moving parts, and the mechanical parameters; wherein, the structural features of the moving parts include: the structural features of the hydraulic damper and the parameters of the hydraulic damper element; Based on the structural features of the moving parts, the connection relationship of the moving parts, and the mechanical parameters, a three-dimensional model of the spring operating mechanism is constructed. A mathematical model of the hydraulic buffer is constructed based on the mechanical parameters, the structural characteristics of the hydraulic buffer, and the parameters of the hydraulic buffer components. A multi-dynamic simulation model is constructed by coupling the three-dimensional model of the spring operating mechanism and the mathematical model of the hydraulic buffer. Based on the multi-dynamic simulation model, the dynamic simulation of the spring operating mechanism to be processed is performed to obtain the piston rod displacement and piston rod velocity. The buffer resistance in the mechanical parameters is updated based on the piston rod displacement and piston rod velocity; and the multi-dynamic simulation model is updated based on the updated buffer resistance.

2. The simulation method for a spring-operated mechanism based on hydraulic buffer modeling as described in claim 1, characterized in that, The structural features of the moving parts include: the shape of the moving parts, the size of the moving parts, the position of the moving parts, and the spring stiffness; the mechanical parameters include: the frictional force of the moving parts, the spring force, and the spring preload; the structural features of the hydraulic damper include: the size of the hydraulic damper and the position of the hydraulic damper. Based on the structural features of the moving parts, the connection relationships of the moving parts, and the mechanical parameters, a three-dimensional model of the spring-operated mechanism is constructed, including: Based on the shape, size, and position of the moving parts, a frame model of the spring-operated mechanism is constructed. Based on the preset key moving parts type, the size of the hydraulic buffer, and the position of the hydraulic buffer, the frame model of the spring operating mechanism is simplified to obtain the moving body model of the spring operating mechanism; Based on the connection relationship of the moving parts, determine the motion constraint relationship and motion constraint distribution of the moving parts; Based on the motion constraint relationship and the motion constraint distribution, add motion pair constraints to each moving part in the motion model of the spring operating mechanism; Based on the frictional force of the moving parts, the spring force, the spring preload, and the spring stiffness, a contact simulation is performed on the motion model with added kinematic pair constraints to obtain a three-dimensional model of the spring operating mechanism.

3. The simulation method for a spring-operated mechanism based on hydraulic buffer modeling as described in claim 2, characterized in that, The mechanical parameters also include hydraulic damping force, moving contact load reaction force, and buffer resistance; the hydraulic buffer element parameters include: equivalent mass of piston rod, effective cross-sectional area of ​​piston, flow area of ​​damping orifice, major diameter of damping orifice, pressure difference between the two ends of damping orifice, piston diameter, piston width, hydraulic oil density, dynamic viscosity of hydraulic oil, and fitting clearance between piston and cylinder. Based on the mechanical parameters, the structural characteristics of the hydraulic buffer, and the parameters of the hydraulic buffer components, a mathematical model of the hydraulic buffer is constructed, including: Based on the spring force, the hydraulic damping force, the frictional force of the moving parts, the load reaction force of the moving contact, the buffer resistance, the equivalent mass of the piston rod, and the effective cross-sectional area of ​​the piston, a piston rod force model of the hydraulic buffer is constructed; wherein, the buffer resistance in the initial construction of the piston rod force model is a preset external force; Based on the major diameter of the damping orifice and a preset flow equation correspondence table, the type of flow equation for the damping orifice corresponding to the major diameter of the damping orifice is determined; wherein, the preset flow equation correspondence table represents the correspondence between the major diameter of the damping orifice and the type of flow equation for the damping orifice. The flow rate of the damping orifice is calculated based on the corresponding damping orifice flow equation type, the flow area of ​​the damping orifice, the density of the hydraulic oil, the pressure difference across the damping orifice, and the preset flow coefficient. The gap flow rate is calculated based on the piston diameter, piston width, hydraulic oil density, hydraulic oil dynamic viscosity, and the fit clearance between the piston and the cylinder. A mathematical model of the hydraulic buffer is constructed based on the flow rate of the damping orifice, the flow rate of the gap, and the force model of the piston rod of the hydraulic buffer.

4. The simulation method for a spring-operated mechanism based on hydraulic buffer modeling as described in claim 3, characterized in that, Based on the aforementioned multi-dynamic simulation model, a dynamic simulation of the spring-operated mechanism to be processed is performed to obtain the piston rod displacement and piston rod velocity, including: The current external force is applied to the three-dimensional model of the spring-operated mechanism in the multi-dynamic simulation model to simulate the movement of the piston rod of the hydraulic buffer in the three-dimensional model of the spring-operated mechanism, and to obtain the initial displacement and initial velocity of the piston rod during the simulated movement; wherein, the current external force during the first simulation is a preset external force; The initial displacement and initial velocity of the piston rod are input into the hydraulic buffer mathematical model of the multi-dynamic simulation model to calculate the initial buffer resistance. The initial buffer resistance is input into the multi-dynamic simulation model to perform dynamic simulation of the spring operating mechanism to be processed, thereby obtaining the piston rod displacement and piston rod speed.

5. The simulation method for a spring-operated mechanism based on hydraulic buffer modeling as described in claim 4, characterized in that, The moving parts include: an arc-extinguishing chamber, a linkage mechanism, a moving contact, an insulating pull rod, a cam, and a spring.

6. The simulation method for a spring-operated mechanism based on hydraulic buffer modeling as described in claim 1, characterized in that, Also includes: Based on the updated multi-dynamic simulation model, the operating status of the circuit breaker is evaluated, and the circuit breaker operating status evaluation results are obtained. Based on the circuit breaker operation status assessment results, determine whether the circuit breaker meets the actual standards.

7. A simulation system for a spring-operated mechanism based on hydraulic buffer modeling, characterized in that, include: The data acquisition module is used to acquire the structural features of the moving parts, the connection relationships of the moving parts, and the mechanical parameters of each moving part in the spring operating mechanism to be processed; wherein, the structural features of the moving parts include: the structural features of the hydraulic damper and the parameters of the hydraulic damper elements; A 3D model building module is used to build a 3D model of the spring operating mechanism based on the structural features of the moving parts, the connection relationship of the moving parts, and the mechanical parameters. The buffer mathematical model construction module is used to construct a hydraulic buffer mathematical model based on the mechanical parameters, the structural characteristics of the hydraulic buffer, and the parameters of the hydraulic buffer components. The multi-dynamic simulation model coupling module is used to couple the three-dimensional model of the spring operating mechanism and the mathematical model of the hydraulic buffer to construct a multi-dynamic simulation model. The model simulation module is used to perform dynamic simulation of the spring operating mechanism to be processed based on the multi-dynamic simulation model, so as to obtain the piston rod displacement and piston rod speed. The model update module is used to update the buffer resistance in the mechanical parameters according to the piston rod displacement and piston rod velocity; and to update the multi-dynamic simulation model according to the updated buffer resistance.

8. The simulation system for a spring-operated mechanism based on hydraulic buffer modeling as described in claim 7, characterized in that, The structural features of the moving parts include: the shape of the moving parts, the size of the moving parts, the position of the moving parts, and the spring stiffness; the mechanical parameters include: the frictional force of the moving parts, the spring force, and the spring preload; the structural features of the hydraulic damper include: the size of the hydraulic damper and the position of the hydraulic damper. The 3D model construction module includes: A frame model building unit is used to build a frame model of the spring operating mechanism based on the shape, size, and position of the moving part. The motion model construction unit is used to simplify the frame model of the spring operating mechanism according to the preset key motion component types, the size of the hydraulic buffer, and the position of the hydraulic buffer, so as to obtain the motion model of the spring operating mechanism. The component constraint determination unit is used to determine the motion constraint relationship and motion constraint distribution of the moving components based on the connection relationship of the moving components; The component constraint unit is used to add kinematic pair constraints to each moving component in the motion model of the spring operating mechanism according to the kinematic constraint relationship and the kinematic constraint distribution; The three-dimensional model simulation unit is used to perform contact simulation on the motion body model after adding kinematic pair constraints based on the friction force of the moving parts, the spring force, the spring preload, and the spring stiffness, so as to obtain the three-dimensional model of the spring operating mechanism.

9. A terminal device, characterized in that, The system includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements a simulation method for a spring-operated mechanism based on hydraulic damper modeling as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to perform a simulation method for a spring-operated mechanism based on hydraulic damper modeling as described in any one of claims 1 to 6.

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