Method and device for dynamic simulation of circuit breakers
By combining multibody dynamics and finite element model simulation, the problem of insufficient accuracy in the dynamic simulation of circuit breaker transmission mechanism is solved, achieving high-precision simulation results and structural optimization suggestions, and reducing the technical threshold and computational cost.
Patent Information
- Application Number
- CN202610215241.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-14
- Publication Date
- 2026-06-26
Smart Images
Figure CN122287185A_ABST
Abstract
Description
Technical Field
[0001] This specification relates to the field of circuit breaker simulation technology, and in particular to a method and apparatus for simulating the dynamics of a circuit breaker. Background Technology
[0002] As a critical protective device in power systems, the dynamic performance of the transmission mechanism of circuit breakers directly affects the reliability and service life of switching operations. With the development of power systems towards ultra-high voltage and extra-high voltage, the structure of circuit breaker transmission mechanisms is becoming increasingly complex, and the accuracy requirements for their dynamic simulation analysis are constantly increasing.
[0003] The dynamic simulation of circuit breaker transmission mechanisms mainly employs two technical approaches: multibody dynamics (MBD) and finite element analysis (FEA). However, single-domain simulation methods suffer from certain distortions and cannot comprehensively and accurately reveal the true working state of the transmission mechanism. For example, while multibody dynamics can efficiently simulate system-level motion timing and dynamic response, it highly simplifies physical processes such as contact and deformation, leading to severe distortions in stress and strain results in local collision areas. Furthermore, although finite element analysis can perform detailed local analysis of key components, it lacks realistic and dynamic boundary conditions from the entire transmission mechanism. Summary of the Invention
[0004] This specification provides a method and apparatus for simulating the dynamics of a circuit breaker, which improves the accuracy of dynamic simulation of the circuit breaker's transmission mechanism.
[0005] This specification provides an embodiment of a dynamic simulation method for a circuit breaker, including: Construct the first multibody dynamics model of the transmission mechanism in the circuit breaker; Based on the global simulation results of the first multibody dynamics model, the first motion boundary conditions of the target interface are extracted; Construct a finite element model of the target interface; Based on the first motion boundary condition, obtain the first local simulation result of the finite element model; Based on the first local simulation results, an equivalent nonlinear mechanical element is constructed; Based on the nonlinear mechanical elements, the first multibody dynamics model is updated to obtain the second multibody dynamics model; Based on the second multibody dynamics model and the finite element model, the dynamic simulation results of the transmission mechanism are obtained.
[0006] In some embodiments, a drive input under opening or closing conditions can be applied to the first multibody dynamics model; based on the applied drive input, a transient simulation is performed on the first multibody dynamics model to obtain the global simulation results; the global simulation results include the dynamic data of the transmission mechanism.
[0007] In some embodiments, the first local simulation result includes the mechanical data of the target interface during the impact process, and obtaining the first local simulation result of the finite element model includes: Apply the first motion boundary condition to the finite element model; Dynamic analysis was performed on the finite element model to obtain the mechanical data of the target interface during the impact process.
[0008] In some embodiments, obtaining the dynamic simulation results of the transmission mechanism includes: The global simulation results of the first multibody dynamics model and the global simulation results of the second multibody dynamics model are checked for consistency. If the verification results meet the preset conditions, the dynamic simulation results of the transmission mechanism are obtained based on the second multibody dynamics model and the finite element model.
[0009] In some embodiments, obtaining the dynamic simulation results of the transmission mechanism includes: Perform a consistency check on the global simulation results of the first multibody dynamics model and the second multibody dynamics model; if the check result does not meet the preset conditions, iteratively execute the following steps until the preset conditions are met: Using the second multibody dynamics model as the new first multibody dynamics model, and based on the global simulation results of the new first multibody dynamics model, extract the new first motion boundary conditions of the target interface; Based on the new first motion boundary conditions, obtain the new first local simulation results of the finite element model; Based on the new first-part simulation results, a new equivalent nonlinear mechanical element is constructed; The new first-body dynamics model is updated based on the new nonlinear mechanical elements; After the iteration is completed, the dynamic simulation results of the transmission mechanism are obtained based on the second multibody dynamics model and the finite element model.
[0010] In some embodiments, obtaining the dynamic simulation results of the transmission mechanism includes: Based on the global simulation results of the second multibody dynamics model, the second motion boundary conditions of the target interface are extracted; Based on the second motion boundary condition, obtain the second local simulation result of the finite element model; The dynamic simulation results of the transmission mechanism include the global simulation results of the second multibody dynamics model and the second local simulation results of the finite element model.
[0011] In some embodiments, the global simulation results of the second multibody dynamics model include the dynamic behavior of the transmission mechanism, and the second local simulation results of the finite element model include the stress-strain state of the target interface.
[0012] In some embodiments, critical components at risk of failure can be identified in the transmission mechanism based on the results of the dynamic simulation.
[0013] This specification also provides a dynamic simulation device for a circuit breaker, comprising: The first building unit is used to build the first multibody dynamics model of the transmission mechanism in the circuit breaker; The extraction unit is used to extract the first motion boundary conditions of the target interface based on the global simulation results of the first multibody dynamics model. The second construction unit is used to construct the finite element model of the target interface; The first acquisition unit is used to acquire the first local simulation result of the finite element model based on the first motion boundary condition; The third building unit is used to build an equivalent nonlinear mechanical element based on the first local simulation result; An update unit is used to update the first multibody dynamics model according to the nonlinear mechanical element to obtain a second multibody dynamics model; The second acquisition unit is used to acquire the dynamic simulation results of the transmission mechanism based on the second multibody dynamics model and the finite element model.
[0014] This specification also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for simulating the dynamics of a circuit breaker.
[0015] This specification also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for simulating the dynamics of a circuit breaker.
[0016] This specification also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described dynamic simulation method for circuit breakers.
[0017] The technical solution of the embodiments in this specification can construct a first multibody dynamics model of the transmission mechanism in a circuit breaker; extract the first motion boundary conditions of the target interface based on the global simulation results of the first multibody dynamics model; construct a finite element model of the target interface; obtain the first local simulation results of the finite element model based on the first motion boundary conditions; construct equivalent nonlinear mechanical elements based on the first local simulation results; update the first multibody dynamics model based on the nonlinear mechanical elements to obtain a second multibody dynamics model; and obtain the dynamic simulation results of the transmission mechanism based on the second multibody dynamics model and the finite element model. Therefore, the embodiments in this specification achieve accurate dynamic analysis of the circuit breaker transmission mechanism through coupled simulation of the multibody dynamics model and the finite element model, overcoming the accuracy deficiencies of single simulation methods. Furthermore, the embodiments in this specification do not rely on real-time coupled calculations of the MBD model and the FEA model. Instead, they use the motion boundary conditions (e.g., displacement and velocity time histories) output by the system-level MBD model as input to drive the local FEA model, thereby obtaining realistic local simulation results (e.g., nonlinear contact reactions). These local simulation results are then written back into the system-level MBD model as equivalent nonlinear mechanical elements, ultimately yielding reliable and reproducible dynamic simulation results of the transmission mechanism (e.g., impact loads and local stress states). This achieves offline co-simulation of the MBD and FEA models. Compared to existing technologies, this significantly reduces the technical threshold and computational cost, enabling the large-scale application and promotion of high-precision multi-domain co-simulation in conventional engineering design. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a flowchart illustrating the dynamic simulation method of the circuit breaker in the embodiments of this specification; Figure 2 This is a schematic diagram of the dynamic simulation process of the circuit breaker in the embodiments of this specification; Figure 3 This is a functional structure diagram of the dynamic simulation device for the circuit breaker in the embodiments of this specification. Detailed Implementation
[0020] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. The specific embodiments described herein are only used to explain this disclosure, and not to limit this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure are within the scope of protection of this disclosure. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.
[0021] Existing simulation methods for the dynamics of circuit breaker transmission mechanisms include single-domain simulation and real-time co-simulation. Single-domain simulation methods have inherent limitations. For example, while multibody dynamics can efficiently simulate system-level motion timing and dynamic response, it highly simplifies physical processes such as contact and deformation, leading to severe distortion of stress and strain results in local collision areas. Similarly, while finite element analysis can perform detailed local analysis of key components, it lacks realistic, dynamic boundary conditions from the entire transmission mechanism. Real-time co-simulation methods rely on the real-time collaboration of multibody dynamics (MBD) and finite element analysis (FEA) methods. However, implementing real-time co-simulation methods has extremely high barriers to entry. The solvers for MBD and FEA differ fundamentally in their theoretical foundations and time integration schemes; forced real-time coupling can easily lead to numerical oscillations, non-physical increases or decreases in energy, and even computational divergence. Furthermore, real-time co-simulation methods are computationally expensive. To achieve data synchronization, the coupling of MBD and FEA requires a minimum time step. Since the actions and impacts of ultra-high voltage circuit breakers are millisecond-level conditions, the computational load increases exponentially.
[0022] This specification provides a dynamic simulation method for circuit breakers. This method achieves accurate dynamic analysis of the circuit breaker transmission mechanism through joint simulation of a multibody dynamics model and a finite element model.
[0023] In some embodiments, a circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Circuit breakers include high-voltage circuit breakers.
[0024] A circuit breaker may include components such as an arc-extinguishing component, an operating mechanism, and a transmission mechanism. The transmission mechanism connects the operating mechanism and the arc-extinguishing component, and can accurately and quickly transmit the power output by the operating mechanism to the moving contact of the arc-extinguishing component through the linkage and motion mode conversion of multiple components. This drives the moving contact to complete the opening and / or closing actions, while ensuring that the stroke, speed, timing, and synchronization of the moving contact's opening and closing meet the design requirements and match the arc-extinguishing characteristics of the arc-extinguishing component.
[0025] The transmission mechanism may include an energy storage and release mechanism linkage, a transmission chain, a transmission rod, a limiting component, a buffer component, and a moving contact connector. The energy storage and release mechanism linkage is connected to the operating mechanism and receives the energy storage and release power from the operating mechanism (such as the output force of a spring-operated mechanism or a hydraulic operating mechanism). As the power input end of the transmission mechanism, the energy storage and release mechanism linkage can transmit linear or rotational power to the subsequent transmission chain. The transmission chain includes hinged cranks, connecting rods, and rocker arms, used to convert the motion form of the power input from the linkage to adapt to the motion requirements of the moving contact of the arc-extinguishing component, while simultaneously achieving the matching and adjustment of power and motion speed. The transmission rod, as a rigid force transmission component, connects the transmission chain and the moving contact connector, receiving and stably transmitting the power transmitted by the transmission chain to ensure that the moving contact's operating speed meets design requirements. The limiting component and the buffer component work together to limit the travel of the transmission mechanism, absorb impact kinetic energy, and prevent overtravel or damage to components. The moving contact connector is used to connect the moving contact of the arc-extinguishing component to ensure that power is accurately transmitted to the moving contact.
[0026] In some embodiments, ultra-high voltage circuit breakers serve as core protection devices in power systems, and their reliability in opening and closing directly impacts grid security. Their transmission mechanism is a complex electromechanical-hydraulic coupled system. During opening and closing, the transmission mechanism undergoes large displacements and high accelerations within milliseconds, accompanied by intense nonlinear contact and secondary impacts, resulting in transient dynamic behaviors. Accurate simulation analysis of this process is crucial for optimizing design, troubleshooting, and predicting lifespan.
[0027] It should be noted that the aforementioned transient dynamic behavior stems from the synergistic effect of multiple factors. First, the instantaneous nature of the power input. The operating mechanism rapidly releases energy to match the arc extinguishing sequence, and the instantaneous driving force causes the transmission mechanism to start quickly, generating high acceleration. Second, structural characteristics. The transmission mechanism consists of multiple components, and the gaps between these components lead to frequent contact, with instantaneous changes in contact force resulting in nonlinear contact. Third, the limiting and buffering effects. The collision when the circuit breaker is in position generates an instantaneous impact force, and the rebound of the components triggers a secondary impact; coupled with the superposition of mechanical-electrical-hydraulic coupling effects, this further exacerbates the complexity of the transient response.
[0028] Please see Figure 1 and Figure 2Dynamic simulation methods can be applied to computer equipment, including the following steps.
[0029] Step 11: Construct the first multibody dynamics model of the transmission mechanism in the circuit breaker.
[0030] In some embodiments, the first multibody dynamics (MBD) model is an initial simulation model obtained by digitally modeling the circuit breaker drive mechanism based on multibody dynamics theory. The first multibody dynamics model is a system-level multibody dynamics simulation calculation model. The first multibody dynamics model can balance system-level integrity and initial simplification, covering all components of the drive mechanism while adopting simplified equivalents for complex components such as buffers.
[0031] In some embodiments, the first multibody dynamics model is used for system-level simulation under opening or closing conditions to simulate the motion process of the entire transmission mechanism and capture key dynamic responses (such as the dynamic responses of the buffer push rod and the cylinder). The first multibody dynamics model can also be used to extract core boundary condition data to provide input for the loading and solving of subsequent local FEA models.
[0032] In some embodiments, the first multibody dynamics model covers the entire chain of components and connections of the circuit breaker transmission mechanism. The entire chain includes core components such as the energy storage and release mechanism, the transmission chain (crank-connecting rod-rocker arm), the transmission tie rod, the limiting assembly, the buffer assembly, and the moving contact connector. The modeling of these components is primarily based on rigid bodies. For critical components prone to large deformations and significant impact loads, such as the tie rod transition section, the limiting seat, and the buffer housing, flexible body descriptions are introduced (e.g., their flexible characteristics can be imported through a modal neutral file). Regarding connections and constraints, rigid components are connected through revolute joints, sliding joints, or compound hinges to achieve flexible linkage between components, matching actual motion conditions. Simultaneously, to complete the simulation calculation of the basic dynamic response, complex components such as buffers are equivalent to linear mechanical elements (e.g., linear springs, linear dampers, ideal hard-limiting models, etc.) in the first multibody dynamics model.
[0033] In some embodiments, digital models of various components can be built based on the actual geometric dimensions of the parts in the transmission mechanism; rigid and flexible bodies can be distinguished; for components requiring flexible description, their flexible characteristics can be imported into a modal neutral file to accurately capture large deformations and impact responses; revolute joints, sliding joints, or compound hinges can be set between rigid components to achieve motion constraints between components; buffers and the like can be simplified into linear spring-damping elements to complete the assignment of basic force elements. Thus, the first multibody dynamics model is constructed through structural replication, constraint definition, characteristic assignment, and simplified equivalence.
[0034] Step 12: Extract the first motion boundary conditions of the target interface based on the global simulation results of the first multibody dynamics model.
[0035] In some embodiments, drive inputs under opening or closing conditions can be applied to the first multibody dynamics model. Transient simulations can be performed on the first multibody dynamics model based on the applied drive inputs to obtain global simulation results. Drive inputs may include, for example, release force, stroke command, and speed constraints. By applying drive inputs under opening or closing conditions to the first multibody dynamics model, the complete motion process of the transmission mechanism can be simulated, enabling simulation calculations of the transmission mechanism's dynamic response and obtaining global simulation results. The global simulation results include the motion timing data of the transmission mechanism, such as the time history of displacement-velocity-acceleration.
[0036] In some embodiments, the target interface is a specific physical region selected from the transmission mechanism for subsequent coupling with the finite element model. In practice, it can be a mechanical contact or mating area with critical transient mechanical behavior or failure risk. The target interface can be a region in the transmission mechanism with specific dynamic characteristics and failure risks. For example, a region in the transmission mechanism where severe collisions, limiting, buffering, or mating wear occur, and which has high impact, sudden force surge, or potential failure risk, can be selected as the target interface. Specifically, for example, the target interface may include the contact area of a limit or stop block, the contact area between the buffer push rod and the cylinder body, the pin-sleeve mating surface, the area near the threaded step of the tie rod, etc.
[0037] In some embodiments, the first motion boundary conditions of the target interface can be extracted from the global simulation results of the first multibody dynamics model. The first motion boundary conditions may include the time history data of the target interface, such as time history curves showing the relative displacement, relative velocity, etc. of the target interface as a function of time, and may also include time history curves showing the relative rotation angle, angular velocity, etc.
[0038] The number of target interfaces can be one or more. For each target interface, dynamic data such as relative displacement, relative velocity, relative rotation angle, and angular velocity can be extracted from the first multibody dynamics model, and time history curves can be generated based on the dynamic data.
[0039] For example, for the target interface between the buffer push rod and the cylinder, time history curves such as relative displacement and relative velocity can be extracted. These time history curves cover the periods of the push rod's initial contact with the buffer chamber, the compression of the buffer chamber, and the rebound and re-collision.
[0040] Step 13: Construct the finite element model of the target interface.
[0041] In some embodiments, a corresponding finite element model can be constructed for each target interface. The finite element model is a locally explicit dynamic simulation calculation model. The finite element model is used to simulate the real mechanical behavior of the target interface under high-frequency impact conditions, and to accurately calculate its mechanical response during the impact process, making up for the shortcomings of the simplified force elements (such as linear spring-damping elements) in the first multibody dynamics model, which cannot reflect the real mechanical characteristics.
[0042] In some embodiments, the finite element model is based on the target interface, encompassing various mechanical characteristics and structural details under real-world working conditions. It replicates the geometry of the target interface and surrounding key structures, covering not only minute structures such as fillet radii, backlash, stepped transitions, and buffer apertures, but also specific components such as buffer push rods, cylinders, limiting shoulders, throttling orifices, and sealing pairs, ensuring complete matching of geometric features with actual working conditions. Additionally, the finite element model can include contact and friction-related parameters. By defining contact pairs and friction pairs, the normal contact and tangential friction behavior between interfaces can be accurately simulated, closely reflecting the contact characteristics in actual motion. For high-frequency impact conditions, the finite element model incorporates material properties, fully considering the nonlinear characteristics of materials, covering rate-dependent constitutive, plastic, yield, and damage behaviors, and matching corresponding specific parameters according to the characteristics of different components. For example, rate-sensitive yield characteristics are incorporated for metal parts, rate-dependent damping characteristics are configured for buffer media, and anisotropic strength limits are set for composite and epoxy insulation components. Furthermore, the finite element model can also include energy dissipation mechanisms. Introducing damping characteristics such as buffer media damping can accurately simulate the energy transfer and dissipation process during impact. Optionally, the finite element model can also incorporate experimentally calibrated high strain rate material parameters, thereby further improving the simulation reliability of the finite element model.
[0043] In some embodiments, a geometric model including surrounding key components and fine structures (such as steps and throttling orifices) can be built based on the actual structure of the target interface to ensure that the geometry is consistent with reality. Contact and friction parameters can be set for the geometric model to characterize the contact pairs and friction pairs of the target interface and simulate real contact and friction behavior. Adaptive material properties can be assigned to the geometric model in conjunction with the high-frequency impact conditions of the target interface, fully considering the nonlinear characteristics of materials. Material parameters covering rate-dependent constitutive, plastic, yield, damage, and damping characteristics can be imported. Specific parameters can be matched according to the material differences of different parts; for example, rate-sensitive yield characteristics can be configured for metal parts, and rate-dependent damping characteristics can be set for the buffer medium. This allows for the construction of a corresponding finite element model for the target interface.
[0044] Step 14: Based on the first motion boundary conditions, obtain the first local simulation results of the finite element model.
[0045] In some embodiments, a refined transient simulation can be performed using a finite element model to obtain the first local simulation results. The first motion boundary condition can serve as the boundary condition for the finite element model during the simulation process, providing accurate dynamic input for the finite element model to simulate the transient mechanical behavior of the target interface, such as impact and contact, ensuring that the local simulation results match the system-level global simulation results. In practical applications, the first local simulation results of each target interface can be obtained based on the first motion boundary condition and the finite element model. The first local simulation results can include the mechanical response data of the target interface during the impact process, specifically covering the time-history changes of various key mechanical parameters. For example, the first local simulation results can include the changes of contact force, reaction force, normal force, and tangential friction force over time, as well as the time-history distribution of stress, strain, plastic work density, and contact surface pressure. Optionally, the first local simulation results can also include the evolution data of transient contact reaction force, damping force, pressure distribution, and internal energy / energy dissipation over time, the reaction force-displacement-velocity relationship, and the mechanical response during the peak impact force, buffer energy absorption, and rebound stages.
[0046] In some embodiments, the first kinematic boundary conditions can be precisely applied to the interface reference points, constraint nodes, coupling nodes, or rigid body reference nodes of the finite element model, serving as transient boundary inputs. Through transient explicit dynamic analysis and explicit dynamic solution, the first local simulation results can be obtained. Optionally, to further improve the reliability of the simulation results, high strain rate material parameters such as the rate-sensitive yield characteristics of metallic parts, the rate-related damping characteristics of buffer media, and the anisotropic strength limit of composite and epoxy insulation components can be calibrated first through high strain rate experiments such as split Hopkinson bar tests and bench impact tests. The calibrated parameters are then input into the finite element model. Transient explicit dynamic analysis and explicit dynamic solution are then performed on the finite element model to obtain the first local simulation results.
[0047] Step 15: Based on the first local simulation results, construct an equivalent nonlinear mechanical element.
[0048] Step 16: Update the first multibody dynamics model according to the nonlinear mechanical element to obtain the second multibody dynamics model.
[0049] In some embodiments, the relationship data between reaction force, displacement, and velocity can be extracted from the first local simulation results. This relationship data may include data from the loading and unloading / springback phases, specifically including, for example, core mechanical correlation data such as the correlation data between friction and normal force, the correlation data between damping force and relative velocity, and springback hysteresis characteristics. The relationship data between reaction force, displacement, and velocity can be fitted to construct an equivalent nonlinear mechanical element that can be called by the MBD model. This element can be described using a nonlinear spring-damping-friction model or a lookup table, replacing the simplified linear mechanical descriptions of contact, limiting, and buffering parts in the first multibody dynamics model.
[0050] In practical applications, equivalent nonlinear mechanical elements include, but are not limited to: a) Nonlinear stiffness characteristics; b) Rate-dependent damping characteristics; c) Friction characteristics, which can reflect the changes in frictional force with normal load and relative velocity, as well as the transition from static friction to dynamic friction; d) Hysteresis or rebound characteristics, which reflect the energy dissipation of the buffering and rebound process through the difference between the loading curve and the unloading curve.
[0051] The aforementioned equivalent nonlinear mechanical elements can be implemented through multidimensional interpolation, generalized force functions, nonlinear connecting elements, or multi-degree-of-freedom bushing-like elements. In practical applications, these characteristics can be embedded into the MBD model in the form of tables, scripts, user-defined force functions, or nonlinear connecting units, according to the interface of the simulation platform used. This replaces the simplified mechanical descriptions previously used for contact, limiting, and buffering parts, such as linear springs, linear damping, or ideal hard limiting. The updated first multibody dynamics model can accurately reflect the hardening characteristics, velocity-dependent damping, and hysteretic rebound characteristics of actual buffering behavior, making up for the shortcomings of the original simplified model in failing to match real mechanical behavior and significantly improving the accuracy of system-level simulation.
[0052] Step 17: Obtain the dynamic simulation results of the transmission mechanism based on the second multibody dynamics model and the finite element model.
[0053] In some embodiments, the updated first multibody dynamics model can be used as the second multibody dynamics model. The dynamic simulation results of the transmission mechanism can be obtained based on the second multibody dynamics model and the finite element model. Specifically, the system-level simulation can be re-performed using the second multibody dynamics model to obtain the global simulation results of the second multibody dynamics model. The global simulation results may include, for example, the motion sequence of key components, the system's kinetic energy / energy dissipation process, the timing of impact events (such as initial contact, secondary impact, rebound peak, etc.), rebound velocity changes, and the velocity, acceleration, and peak force of key parts. The second motion boundary conditions of the target interface can be extracted based on the global simulation results of the second multibody dynamics model; the second local simulation results of the finite element model can be obtained based on the second motion boundary conditions. The dynamic simulation results may include the global simulation results of the second multibody dynamics model and the second local simulation results of the finite element model. The global simulation results of the second multibody dynamics model include the dynamic behavior of the transmission mechanism, and the second local simulation results of the finite element model include the stress-strain state of the target interface.
[0054] In some embodiments, the global simulation results of the first multibody dynamics model and the second multibody dynamics model can also be verified for consistency. If the consistency verification result meets the preset conditions, it indicates that the system-level second multibody dynamics model and the local finite element model have achieved physical self-consistency in terms of force level, energy dissipation mechanism, and impact event timing. At this time, the overall transmission mechanism dynamic behavior output by the second MBD model (e.g., may include peak force, peak acceleration, impact phase characteristics, rebound characteristics, etc.) and the local stress-strain state output by the FEA model can be regarded as high-confidence results simultaneously. Thus, the dynamic simulation results of the transmission mechanism can be obtained based on the second multibody dynamics model and the finite element model. For example, the global simulation results of the second multibody dynamics model can be obtained; the second motion boundary conditions of the target interface can be extracted based on the global simulation results of the second multibody dynamics model; and the second local simulation results of the finite element model can be obtained based on the second motion boundary conditions.
[0055] If the consistency check result does not meet the preset conditions, the following steps can be executed iteratively until the preset conditions are met: Using the second multibody dynamics model as the new first multibody dynamics model, and based on the global simulation results of the new first multibody dynamics model, extract the new first motion boundary conditions of the target interface; Based on the new first motion boundary conditions, obtain the new first local simulation results of the finite element model; Based on the new first-part simulation results, a new equivalent nonlinear mechanical element is constructed; The new first multibody dynamics model is updated based on the new nonlinear mechanical elements.
[0056] After the preset conditions are met, the dynamic simulation results of the transmission mechanism can be obtained based on the second multibody dynamics model and the finite element model. For example, the global simulation results of the second multibody dynamics model can be obtained; the second motion boundary conditions at the target interface can be extracted based on the global simulation results of the second multibody dynamics model; and the second local simulation results of the finite element model can be obtained based on the second motion boundary conditions.
[0057] The aforementioned preset conditions may include energy consistency conditions, temporal consistency conditions, and phase consistency conditions. Energy consistency conditions may include, for example, that the difference in the rates of change of kinetic energy, potential energy, and dissipated energy (including equivalent damping and frictional energy consumption) between the global simulation results of the first and second multibody dynamics models is within a preset tolerance range. Within the impact event time window, the matching degree of the system's kinetic energy decrease, equivalent damping energy consumption, frictional energy consumption, and local plastic energy consumption meets the standard, and the energy difference between them is within a preset tolerance (e.g., the total energy change rate is below a specified threshold). Temporal consistency conditions may include, for example, that the difference in the occurrence times of key impact events (such as the moment of the first impact, the moment of extreme acceleration, and the moment the rebound velocity crosses zero) between the global simulation results of the first and second multibody dynamics models is less than a preset threshold.
[0058] In some embodiments, critical components at risk of failure can be identified in the transmission mechanism based on the results of dynamic simulation. For example, potential weak points of critical components can be identified based on the results of dynamic simulation. These weak points include high stress concentration areas, plastic accumulation areas, extreme surface pressure locations, and dangerous cross-sectional locations such as threads / pins / limiting blocks, as well as their possible failure modes (e.g., shear / bending-torsion combined overload of pins, local crushing of limit blocks, cracking caused by concentrated stress at the root of tie rod threads, secondary impact amplification caused by insufficient springback hysteresis in the buffer structure, etc.). Based on this, specific structural optimization and parameter optimization suggestions can be proposed, such as adjusting the local fillet radius, strengthening stiffeners or thickness, controlling clearance and backlash, optimizing the damping characteristics of the buffer, adjusting the friction pair material and lubrication characteristics, matching preload / stiffness, optimizing the throttling characteristics of the buffer cavity, adjusting the transition fillet of the limit shoulder, and adjusting the buffer stroke and preload, etc.
[0059] The structural and parameter optimization suggestions output by this process can be directly used for the design finalization, local structural optimization, life assessment, and extreme condition reliability verification of the transmission system of large-capacity ultra-high voltage circuit breakers. They can also be directly used to modify the structure or parameters of the buffer to reduce peak impact loads, suppress rebound amplification effects, and improve the energy absorption stability at the opening end.
[0060] The technical solution of the embodiments in this specification can construct a first multibody dynamics model of the transmission mechanism in a circuit breaker; extract the first motion boundary conditions of the target interface based on the global simulation results of the first multibody dynamics model; construct a finite element model of the target interface; obtain the first local simulation results of the finite element model based on the first motion boundary conditions; update the first multibody dynamics model based on the equivalent mechanical elements corresponding to the first local simulation results; and obtain the dynamic simulation results of the transmission mechanism based on the updated second multibody dynamics model and the finite element model. Therefore, the embodiments in this specification achieve accurate dynamic analysis of the circuit breaker transmission mechanism through coupled simulation of the multibody dynamics model and the finite element model, overcoming the accuracy deficiencies of single simulation methods. Furthermore, the embodiments in this specification do not rely on real-time coupled calculations of MBD and FEA. Instead, they use the motion boundary conditions (e.g., displacement and velocity time histories) output by the system-level MBD model as input to drive the local FEA model, obtaining realistic local simulation results (e.g., nonlinear contact reactions). These local simulation results are then written back into the MBD model as equivalent nonlinear mechanical elements, ultimately yielding reliable and reproducible dynamic simulation results of the transmission mechanism (e.g., impact loads and local stress states). This achieves offline joint simulation of MBD and FEA. Compared with existing technologies, this significantly reduces the technical threshold and computational cost, enabling the large-scale application and promotion of high-precision multi-domain joint simulation in conventional engineering design.
[0061] The technical solutions of the embodiments in this specification have the following technical effects.
[0062] I. Improved accuracy and physical consistency of simulation results.
[0063] 1.1. Without the need for real-time coupling between the MBD model and the FEA model, the motion sequence of the system-level transmission mechanism is physically consistent with the actual contact force, stress and damage response of local high-impact parts (limiting, buffering, pin engagement, etc.) through offline iterative force-displacement closed-loop feedback. Reliable peak force, peak acceleration and local stress concentration distribution can be obtained at the same time.
[0064] 1.2. Energy consistency (verifying kinetic energy dissipation, potential energy change, and various energy matching degrees) and impact event timing consistency (verifying key indicators such as impact time, rebound behavior, and velocity zero crossing point) are used as convergence criteria to avoid numerical divergence and spurious energy increases and decreases common in joint simulations, ensuring that the final results are physically consistent.
[0065] II. Optimization of simulation process stability and engineering applicability.
[0066] 2.1. By adopting an offline iterative approach of "step-by-step solution, data write-back, re-solution, and consistency verification", the numerical divergence, step size limitation, and computing power threshold problems commonly found in real-time coupling are avoided, significantly improving the stability and reproducibility of the simulation.
[0067] 2.2. It does not rely on complex cross-software real-time interfaces, has a simple implementation method, and significantly reduces the technical threshold and computational cost, enabling high-precision multi-domain co-simulation to be widely applied and promoted in conventional engineering design.
[0068] III. Enhanced Engineering Application Value and Design Support Capabilities.
[0069] 3.1. The final convergence results can be directly used for structural and parameter optimization, accurately locating potential failure locations (such as high stress concentration areas, plastic accumulation areas, and critical sections) and failure modes (such as pin shear, limit block crushing, and thread root cracking).
[0070] 3.2. Clearly define specific improvement directions (such as fillet adjustment, thickness reinforcement, gap control, buffer damping optimization, preload matching, etc.) to provide direct and effective design basis for improving the large-capacity breaking capacity, extending the service life and finalizing the reliability of ultra-high voltage circuit breakers.
[0071] Please see Figure 3 This specification also provides a dynamic simulation device for a circuit breaker, comprising: The first building unit 31 is used to build the first multibody dynamics model of the transmission mechanism in the circuit breaker; Extraction unit 32 is used to extract the first motion boundary conditions of the target interface based on the global simulation results of the first multibody dynamics model; The second construction unit 33 is used to construct the finite element model of the target interface; The first acquisition unit 34 is used to acquire the first local simulation result of the finite element model according to the first motion boundary condition; The third building unit 35 is used to build an equivalent nonlinear mechanical element based on the first local simulation result; The updating unit 36 is used to update the first multibody dynamics model according to the nonlinear mechanical element to obtain the second multibody dynamics model; The second acquisition unit 37 is used to acquire the dynamic simulation results of the transmission mechanism based on the second multibody dynamics model and the finite element model.
[0072] This specification also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described method for simulating the dynamics of a circuit breaker.
[0073] This specification also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for simulating the dynamics of a circuit breaker.
[0074] This specification also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described dynamic simulation method for circuit breakers.
[0075] Those skilled in the art will understand that this specification can be provided as a method, system, or computer program product. Therefore, this specification may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware. Furthermore, this specification may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0076] This specification is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments thereof. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. The computer may be a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.
[0077] The functional units in the embodiments of this specification can be integrated into one processing unit, or each functional unit can exist physically separately, or two or more functional units can be integrated into one processing unit.
[0078] Those skilled in the art will understand that the descriptions of the various embodiments in this specification have different focuses, and parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. Furthermore, it is understood that those skilled in the art, after reading this specification, can conceive of any combination of some or all of the embodiments listed in this specification without creative effort, and such combinations are also within the scope of disclosure and protection of this specification.
[0079] Although this specification has been described through embodiments, those skilled in the art will understand that the above embodiments are merely illustrative of the core ideas of this specification. Those skilled in the art will appreciate that many variations and modifications are possible with this specification. It is intended that the appended claims encompass these variations and modifications without departing from the spirit of this specification.
Claims
1. A dynamic simulation method for a circuit breaker, characterized in that, include: Construct the first multibody dynamics model of the transmission mechanism in the circuit breaker; Based on the global simulation results of the first multibody dynamics model, the first motion boundary conditions of the target interface are extracted; Construct a finite element model of the target interface; Based on the first motion boundary condition, obtain the first local simulation result of the finite element model; Based on the first local simulation results, an equivalent nonlinear mechanical element is constructed; Based on the nonlinear mechanical elements, the first multibody dynamics model is updated to obtain the second multibody dynamics model; Based on the second multibody dynamics model and the finite element model, the dynamic simulation results of the transmission mechanism are obtained.
2. The method according to claim 1, characterized in that, The method further includes: In the first multibody dynamics model, the drive input under the opening or closing conditions is applied; Based on the applied driving input, a transient simulation is performed on the first multibody dynamics model to obtain the global simulation results; the global simulation results include the motion timing data of the transmission mechanism.
3. The method according to claim 1, characterized in that, The first local simulation result includes the mechanical data of the target interface during the impact process. Obtaining the first local simulation result of the finite element model includes: Apply the first motion boundary condition to the finite element model; Dynamic analysis was performed on the finite element model to obtain the mechanical data of the target interface during the impact process.
4. The method according to claim 1, characterized in that, The acquisition of the dynamic simulation results of the transmission mechanism includes: The global simulation results of the first multibody dynamics model and the global simulation results of the second multibody dynamics model are checked for consistency. If the verification results meet the preset conditions, the dynamic simulation results of the transmission mechanism are obtained based on the second multibody dynamics model and the finite element model.
5. The method according to claim 1, characterized in that, The acquisition of the dynamic simulation results of the transmission mechanism includes: Perform a consistency check on the global simulation results of the first multibody dynamics model and the second multibody dynamics model; if the check result does not meet the preset conditions, iteratively execute the following steps until the preset conditions are met: Using the second multibody dynamics model as the new first multibody dynamics model, and based on the global simulation results of the new first multibody dynamics model, extract the new first motion boundary conditions of the target interface; Based on the new first motion boundary conditions, obtain the new first local simulation results of the finite element model; Based on the new first-part simulation results, a new equivalent nonlinear mechanical element is constructed; The new first-body dynamics model is updated based on the new nonlinear mechanical elements; After the iteration is completed, the dynamic simulation results of the transmission mechanism are obtained based on the second multibody dynamics model and the finite element model.
6. The method according to claim 4 or 5, characterized in that, The acquisition of the dynamic simulation results of the transmission mechanism includes: Based on the global simulation results of the second multibody dynamics model, the second motion boundary conditions of the target interface are extracted; Based on the second motion boundary condition, obtain the second local simulation result of the finite element model; The dynamic simulation results of the transmission mechanism include the global simulation results of the second multibody dynamics model and the second local simulation results of the finite element model.
7. The method according to claim 6, characterized in that, The global simulation results of the second multibody dynamics model include the dynamic behavior of the transmission mechanism, and the second local simulation results of the finite element model include the stress and strain state of the target interface.
8. The method according to claim 1, characterized in that, The method further includes: Based on the dynamic simulation results, key components with potential failure risks were identified in the transmission mechanism.
9. A dynamic simulation device for a circuit breaker, characterized in that, include: The first building unit is used to build the first multibody dynamics model of the transmission mechanism in the circuit breaker; The extraction unit is used to extract the first motion boundary conditions of the target interface based on the global simulation results of the first multibody dynamics model. The second construction unit is used to construct the finite element model of the target interface; The first acquisition unit is used to acquire the first local simulation result of the finite element model based on the first motion boundary condition; The third building unit is used to build an equivalent nonlinear mechanical element based on the first local simulation result; An update unit is used to update the first multibody dynamics model according to the nonlinear mechanical element to obtain a second multibody dynamics model; The second acquisition unit is used to acquire the dynamic simulation results of the transmission mechanism based on the second multibody dynamics model and the finite element model.
10. A computer device, characterized in that, The computer device includes a processor and a memory, the memory being used to store a computer program that can run on the processor, the processor executing the computer program to implement the instructions of any of the methods of claims 1 to 8.