50 results about "Multi body" patented technology

A multi-body dynamics simulation method, system, device and medium for a chain system, the method comprising: acquiring a connection relationship among a plurality of target components in the chain system, a structure parameter, a space environment parameter and a task parameter of each target component, and a physical property of a lubricating medium of the chain system under the space environment parameter; correcting the structure parameter of each target component based on the space environment parameter to obtain a target structure parameter; based on the target structure parameters and the connection relation, determining friction characteristic indexes and motion freedom degrees among the multiple target assemblies; constructing a lubrication-volatilization-friction coupling matrix among the plurality of target components; constructing a multi-body dynamic model according to the target structure parameters and the lubrication-volatilization-friction coupling matrix; and acquiring a rotating speed fluctuation curve and load torque data corresponding to the task parameters, and inputting the rotating speed fluctuation curve and the load torque data into the multi-body dynamic model to obtain a dynamic simulation result of the chain system. The reliability of multi-body dynamics simulation of the chain system can be improved.

The invention relates to the technical field of mechanical transmission, in particular to a reinforcement learning compensation method and system for gear multi-body dynamics constraint, and the method comprises the steps: building a multi-body dynamics digital twinborn model containing bearing rigidity and gear meshing force; constructing an adaptive reward function based on nonlinear manifold mapping, and dividing a system state space into a small deviation domain and a large deviation domain according to an angle deviation threshold value; training the multi-body dynamic model based on a depth deterministic strategy gradient algorithm to obtain a compensation strategy; the obtained compensation strategy is applied to a multi-body dynamic model, and an optimal compensation signal is obtained through self-adaptive fusion of static compensation and dynamic compensation, so that the training efficiency of a reinforcement learning algorithm in a complex nonlinear system is improved, the adaptability of the system to working condition changes is enhanced, the vibration of a gear system is remarkably reduced, and the reliability of the system is improved. The angle control precision is improved, and the service life of equipment is prolonged.

The invention relates to a wind power blade hoisting load simulation analysis method which comprises the following steps: defining a plurality of simulation working conditions corresponding to a plurality of hoisting scenes according to a blade hoisting scheme of a wind generating set and the plurality of hoisting scenes; a multi-body coupling model established on the basis of a blade hoisting system is adopted, hoisting load simulation analysis is conducted on the basis of the multiple simulation working conditions, hoisting load data of the multiple simulation working conditions are obtained, and the multi-body coupling model comprises blades, a draught fan main engine, a hoisting tool and environment wind conditions. The invention further provides a wind power blade hoisting load simulation analysis device and a storage medium. The simulation analysis of the hoisting load of the wind power blade is realized, the load level of the blade and the whole machine in the hoisting process of the wind power blade can be evaluated, physical tests can be reduced, and the hoisting safety of the wind power blade can be enhanced.

The invention discloses a 3D multi-body system equivariant trajectory prediction method based on multi-scale feature enhancement. The method comprises the following steps: A, obtaining trajectory data to be predicted; b, constructing a multi-scale feature enhancement model; the multi-scale feature enhancement model comprises a direction information decoupling module, a feature enhancement module, a screen type multi-scale feature updating module and a direction information coupling module; c, training the multi-scale feature enhancement model to obtain a trained multi-scale feature enhancement model; and D, performing 3D multi-body system isovariant trajectory prediction on the data to be subjected to trajectory prediction by using the trained multi-scale feature enhancement model, and finally obtaining a trajectory prediction result. According to the method, high-precision prediction of the trajectory of the 3D multi-body system can be realized, and strict constant change of the prediction process is ensured.

The invention discloses a surface material point embedding method for a multi-body contact problem, and belongs to the technical field of computational mechanics and numerical simulation. The method comprises the following steps: 1, performing discretization and parameter setting on a physical model of a multi-body contact system; 2, calculating a contact force; 3, transmitting the physical quantity of the material points of the contact body to background grid nodes to obtain node mass, momentum and force; 4, updating the grids; 5, updating the speed, the displacement, the stress and the density of the material point; 6, resetting the physical quantity of the background grid; seventhly, repeating the first step, the fourth step, the fifth step and the sixth step, sequentially updating the physical quantities of the material points of other contact bodies and the positions and the speeds of the slave nodes, and distributing background grid node memories of the areas where the corresponding contact bodies are located; and 8, after all contact bodies are updated, updating the current time to obtain a dynamic simulation result. According to the method, the boundary of the object can be accurately represented, complicated problems such as impact and multi-body contact can be effectively simulated, and meanwhile, the method has good stability and relatively low memory consumption.

The invention discloses a multi-body system dynamics intelligent modeling calculation system and method based on a natural language, and belongs to the field of overall design of spacecrafts. The problems that in the prior art, when the simulation requirement related to extreme working conditions and strong nonlinear coupling is met, the period is long, manual experience is relied on, and the maintenance cost is high are solved. The system comprises a text segmentation embedding unit used for carrying out text segmentation embedding processing on a multi-body dynamics knowledge base and constructing a vectorized dynamics knowledge context; the large language model unit is used for receiving natural language task description input by a user, performing semantic understanding through LLM (Logistics Language Model) and generating a task analysis result according to dynamic knowledge context learning; and the task processing unit is used for classifying the tasks into inquiry tasks, command and control tasks or construction tasks according to the task analysis result, and calling corresponding modules according to LLM and MCP technologies. The method is used in the field of multi-body system dynamics modeling of spacecrafts.

The invention discloses an optimal design method for a circulating type planetary roller screw structure. The method comprises the following steps: firstly, establishing a multi-body contact mathematical model of a circulating type planetary roller screw; constructing a Bayesian learning model based on variational inference in combination with an active learning Kriging strategy; constructing a multi-objective optimization model, and determining design structure parameters, optimization objectives and constraint conditions; and solving the multi-objective optimization model by combining a Bayesian learning model and an NSGA-III algorithm, so as to obtain an optimal parameter combination when the contact points among the structures of the circulating planetary roller screw are constrained in a given range and the contact stress is minimized at the same time. According to the invention, the contact stress can be effectively reduced, the contact fatigue can be delayed, the transmission reliability can be improved, and the requirements of high-precision and high-load application can be met.

The invention discloses a method for predicting the machining limit of a free pipe bending device based on multi-body implicit interference inference. Comprising the following steps: firstly, obtaining the overall representation of a to-be-tested free elbow device, obtaining respective joint prediction intervals of curvature and torsion of a to-be-processed elbow by using an operator fusion network, and judging whether interference occurs between the to-be-processed elbow and the to-be-tested free elbow device under each rebound axis; finally, whether interference occurs between the bent pipe to be processed and the free bent pipe device to be detected or not is obtained. And whether interference occurs between the dies is determined by using the symbol distance value. The method has excellent generalization performance, has reliable pipe section-mold interference inference capability, and can realize more comprehensive processing limit prediction of the free pipe bending device.

The invention relates to a multi-body dynamics simulation modeling method for a laser radar control system of a paddy field laser land leveler, and the method comprises the steps: building a whole machine mechanical model based on a multi-body dynamics simulation environment, enabling a virtual marking point and a measurement function to be equivalent to a laser radar sensing module, and integrating an embedded controller based on a built-in calculation function of software, thereby achieving the simulation modeling of the laser radar control system of the paddy field laser land leveler. Full-link closed-loop simulation of'perception-decision-execution-response 'is realized in a unified platform; by simulating various road excitation and operation conditions, the tracking precision, response speed and stability of a control algorithm can be directly verified in a virtual environment, and parameter optimization is completed. The method solves the key problem that a control system lacks a real controlled object and excessively depends on a physical model machine in the early stage of development, achieves full-digital system-level verification and performance prediction, can remarkably shorten the research and development period and reduce the development cost, and belongs to the technical field of agricultural machinery control system simulation verification.

Multi-body modular aircraft (MMOs) have attracted widespread attention due to their ability to rapidly dock in mid-air and flexibly separate and reassemble according to mission requirements and flight environment, thus meeting multiple mission needs such as long endurance flight after aggregation and flexible maneuverability after dispersion. However, during the docking and separation process, MMOs face wingtip vortex interference, which affects the aircraft's attitude and trajectory, easily causing instability in the closed-loop system. Current robust flight control methods for the docking and separation process of MMOs cannot simultaneously achieve control surface command and aircraft thrust optimization control while meeting the requirements of multi-constraint and high disturbance rejection control. This invention proposes a robust model predictive control method for uniform tubes during in-air docking and separation of aircraft. This method can achieve robust optimization control during the docking and separation process of MMOs under wingtip vortex interference, which helps to improve the safety of the docking and separation process of MMOs.

The technology provides a multi-body earpiece suitable for use as an in-ear sensor system, which can be used for biometrics or a human-computer interface. The multi-body earpiece includes two body elements connected together by a flexure. These components provide at least 3 points of contact along different parts of the outer ear, in which the flexure is tethered to the two bodies and arranged to lock them in place during wear. In addition to having stability from moving while minimizing sound occlusion, this arrangement enables any electrodes for the on-board sensor(s) to remain in contact with the skin of the ear and provide as many contact points in desired areas as the electronics dictate for the signals of interest.

The invention discloses a double-collision double-tuned damper for controlling transverse vibration of a floating fan tower, which is designed by the following steps of: constructing a single-column floating fan model; describing the movement of the single-column floating fan by adopting an Euler-Lagrange method and multi-body dynamics; and finally, substituting the kinetic energy and the potential energy into an Euler-Lagrange equation and carrying out linearization to obtain a mass matrix, a stiffness matrix and a damping matrix of the floating fan. DPDTMD design: coupling the kinetic energy and potential energy of the DPDTMD with the kinetic energy and potential energy of the floating fan, and finally obtaining a mass matrix, a stiffness matrix and a damping matrix of a motion equation of the single-column floating fan under the control of the DPDTMD through an Euler-Lagrange equation; dPDTMD parameter optimization includes the mass, rigidity and damping of the two dampers, the installation position of the limiting stopper and the collision rigidity and recovery coefficient of the collision material. On the basis of ensuring the control effect and robustness of the damper, the maximum stroke of the vibration absorber is limited.

The present invention relates to a multi-body housing (11) for an electric drive train (200), comprising a first housing part forming one or more compartments (10, 75) for accommodating components of the electric drive train (200), wherein the one or more compartments (10, 75) comprise or comprise a first compartment (10) for accommodating a first component present as an electric motor (1) with a motor shaft (55), a second housing part forming a plurality of fluid passages for guiding a cooling and / or lubricating fluid, wherein the second housing part is designed to evacuate the cooling and / or lubricating fluid from the one or more compartments (10, 75) by means of a pressure gradient along at least one of the plurality of fluid passages, wherein the pressure gradient is generated by means of rotation of the motor shaft (55) and / or by means of rotation of a counterpart of the motor shaft (55) when the electric motor (1) is in a switched-on state,wherein the housing (11) comprises, as an integral component, a fluid trough (76, 77) for receiving the cooling and / or lubricating fluid from the plurality of fluid passages, wherein the first compartment (10) is fluidly coupled to the fluid trough (76, 77) via at least one of the plurality of fluid passages. The present invention further relates to an electric drive train having an electric motor and such a multi-body housing. The present invention further relates to an at least partially electrified vehicle having such an electric drive train.

The invention discloses a parallel preparation method of a multi-body entangled state among distributed nodes, which comprises the following steps of: placing N quantum memories in a distributed manner, arranging an optical switch in front of each static bit in a scene in which M static bits are stored in each memory, performing joint coding on high-dimensional single photons and the optical switches, and obtaining a multi-body entangled state of each quantum memory; when a single photon passes through the quantum memories, only a specific static bit interacts with the single photon, and then the single photon sequentially passes through the N quantum memories to obtain hybrid entanglement of a photon state and a plurality of quantum bits. And then generalized X-base measurement is carried out on the single photon, so that the hybrid entangled state collapses on a certain Fourier base of the single photon, and finally preparation of a many-to-many entangled state between distributed nodes is realized. According to the method, efficient preparation of many-to-many entangled states among distributed nodes is realized by utilizing a high-dimensional time coding single photon, and the requirement on coherence time of a quantum memory in an entanglement preparation process is reduced.

The technology provides a multi-body earpiece suitable for use as an in-ear sensor system, which can be used for biometrics or a human-computer interface. The multi-body earpiece includes two body elements connected together by a flexure. These components provide at least 3 points of contact along different parts of the outer ear, in which the flexure is tethered to the two bodies and arranged to lock them in place during wear. In addition to having stability from moving while minimizing sound occlusion, this arrangement enables any electrodes for the on-board sensor(s) to remain in contact with the skin of the ear and provide as many contact points in desired areas as the electronics dictate for the signals of interest.

This invention relates to the field of agricultural machinery technology, specifically to a multibody dynamics coupling modeling method for a tractor's integrated transmission system that integrates tire-soil-implement interaction. The method includes constructing an initial multibody dynamics model comprising the engine, main and auxiliary gearboxes, transfer case, front and rear drive axles, and tires. By incorporating soil hardness, tire pressure, and implement parameters, and introducing tire-soil and implement-soil interaction models, the mechanical coupling between tires, implements, and soil is achieved. Through high-precision numerical solutions, the traction efficiency and energy consumption indicators of the tractor under different soil conditions and operating modes are obtained, thus providing theoretical support for tractor energy efficiency optimization and operating strategies. This invention, through global coupling modeling and high-precision simulation, can effectively improve the traction efficiency of the tractor transmission system, reduce energy consumption, and provide quantitative basis for optimized design, possessing broad engineering application value.

The invention discloses a multi-body system model confirmation method and system considering random and cognitive uncertainty, and a storage medium. The method comprises the following steps: S1, establishing a dynamic model of a multi-body system considering random and cognitive uncertainty; s2, calculating a confidence region responded by the dynamic model by sampling random and cognitive uncertainty parameters; s3, performing a test to obtain test data, and calculating a confidence region of a test response according to the test data; s4, calculating a model confirmation measurement index according to the coincidence rate of the confidence regions of the dynamic model response and the test response in the time domain, judging whether the dynamic model meets the requirement or not, if so, confirming that the dynamic model is a final model, and otherwise, entering the step S5; s5, constructing a calibration optimization model used for correcting parameters of the kinetic model; calculating the confidence region of the kinetic model after parameter correction, and returning to the step S4; the device is suitable for a time-varying model, data can be comprehensively considered, and information cannot be lost.

The application discloses a kind of attitude control methods for multi-body flexible satellite platform, comprising: based on micro-element method, the dynamics modeling of multi-body flexible satellite platform is carried out, and the dynamics model is obtained;Multi-body flexible satellite platform includes: central rigid body B and several controlled flexible accessories A i ;Based on the dynamics model, the vibration mode of each controlled flexible accessory A i Is decomposed using modal identity, and the division of control space is completed;On the basis of control space division, system controller design is carried out, and attitude control is carried out based on the designed system controller.The method described in the application carries out control structure division and design to the multi-body flexible satellite platform containing controlled flexible accessory, effectively improves the driving control performance and vibration suppression effect of controlled flexible accessory.

The invention provides a multi-body separation rapid simulation method based on unsteady aerodynamic modeling. The method comprises the steps that firstly, a static aerodynamic force database and unsteady aerodynamic force data of a single typical state are obtained through CFD calculation; and then the two types of data are fused and modeled, and a high-precision agent model capable of predicting aerodynamic force in the dynamic process is constructed. During simulation, the real-time position and posture of a separated body are input into the model, the current aerodynamic force is quickly predicted, the motion state is updated by solving a rigid body six-degree-of-freedom motion equation, surface grid motion is driven to achieve visualization, and loop iteration is conducted till separation is finished. According to the method, static and unsteady aerodynamic forces are fused, the simulation efficiency is improved by several orders of magnitude compared with a traditional method while the precision of capturing the dynamic aerodynamic effect is guaranteed, and the method can be widely applied to design and analysis in the aerospace and weapon engineering fields such as aircraft separation and ammunition scattering.

The invention relates to the technical field of mechanical reliability of operating mechanisms of high-pressure gas insulated switchgear, in particular to a method, a system, equipment and a medium for improving mechanical reliability of a vacuum on-off GIS (gas insulated switchgear) operating mechanism, which are characterized in that a high-damping material is integrated in an internal cavity of a key component in a filling manner to form a built-in energy consumption structure; a multi-body dynamic model containing mechanical parameters of the high-damping material is established, the working process of the operating mechanism is simulated through finite element analysis, and the suppression effect of the built-in energy dissipation structure on vibration and stress is verified; and on the basis of the model subjected to simulation verification, an improved Miner rule is adopted to predict the fatigue life of a key part, and a particle swarm optimization algorithm is utilized to optimize integrated parameters of the high-damping material by taking comprehensive fatigue damage and vibration amplitude as an optimization target. Through the integrated design of the material and the structure, the vibration is inhibited from the source, and the dynamic performance, the anti-fatigue capability and the overall mechanical reliability of the operating mechanism are remarkably improved.

The invention discloses a multi-body linkage penetration system for a wind power suction barrel type foundation and a collaborative operation method of the multi-body linkage penetration system, and the core of the multi-body linkage penetration system is to construct a data processing link with multi-channel synchronous acquisition, time sequence alignment, dynamic physical quantity reconstruction and protocol standardized output capabilities; and fusion sensing and high-fidelity output of key parameters in the penetration process of the suction cylinder foundation are realized. A multi-body linkage penetration system of a wind power suction barrel type foundation comprises a guide pipe frame and at least two suction barrels, penetration equipment is detachably assembled on one suction barrel, and a plurality of sensors are arranged in the suction barrels; the penetration equipment comprises a mainframe box, the mainframe box is arranged on the suction barrel through a supporting bracket, a mainframe is arranged in the mainframe box, the suction barrel is connected with the mainframe through a linkage pipeline, and the mainframe is in electrical communication connection with the upper platform through a cable; the host integrates a power management module, a signal input module, a signal processing module, a data communication module and a local interaction module.

A semiconductor device includes an N-type buried layer (NBL) formed on a substrate; an N-type deep well region (DNW) or a P-type deep-well region (DPW) on the NBL; a deep trench structure including a first deep trench isolation (first DTI) and a second DTI surrounding the NBL; a first isolation N-type well region (first ISO NW) and a second ISO NW; a first ISO N+ region and a second ISO N+ region on the first and second ISO NWs; a first NW and PW formed between the first and second ISO NWs; a first PMOS device including a first gate electrode on the first NW, a first N+ body region, first P+ source and drain regions; a first NMOS device including a second gate electrode on the first PW, a first P+ body region, first N+ source and drain regions; and a field stop PW formed between the first NW and the first ISO NW.

The application provides a multi-body dynamics modeling and simulation method and system of a soft refueling device, and belongs to the technical field of aerial refueling hose modeling. The method comprises the following steps: establishing a variable-length multi-body dynamics model based on a connecting rod hinge structure for a hose cone sleeve combination; deriving a kinematics equation based on the model, and calculating the position, velocity and acceleration of each hinge node in an inertial system; performing force analysis based on the model, deriving a dynamics equation, and calculating the external force acting on each hinge node; based on the kinematics equation and the dynamics equation, establishing a multi-rigid-body associated algebraic equation set and solving it to obtain the tension between the connecting rods; and based on the model, the kinematics equation and the dynamics equation, performing simulation and analyzing the dynamics characteristics of the hose cone sleeve combination under airflow disturbance and the motion of the tanker under different flight conditions. Through fine modeling and simulation, the application improves the docking efficiency and stability of aerial refueling.

The embodiment of the invention provides a multi-body system control method, equipment and a medium. The method comprises the steps that a pre-trained generalized force estimation model is called, the predicted generalized force of the multi-body system is obtained according to the system state of the multi-body system at the current moment, and the generalized force estimation model is a model which is trained based on a physical information neural network in advance and predicts the generalized force borne by the system according to the system state; adopting a variational integrator to calculate the system state at the next moment according to the system state and the predicted generalized force; and outputting the system state at the next moment to an actuator of the multi-body system. The method is used for achieving the effects of improving the stability of a simulation process and the precision of a simulation result in a complex multi-body system dynamics analysis scene, and further improving the stability and the precision of multi-body system control.

The utility model relates to the technical field of design and application of spacecrafts, in particular to a multi-body variable-structure satellite with a staring structure, which comprises a plurality of variable-structure satellites and a plurality of first variable-structure joints, and the heads and the tails of the variable-structure satellites are connected through the first variable-structure joints; each first variable-structure joint comprises a first torsion module, a first bending module, a first folding module and a second folding module which are connected in sequence, and every two adjacent variable-structure satellites are connected to the first torsion module and the second folding module on the same first variable-structure joint correspondingly. The multiple variable-structure satellites are connected end to end through the first variable-structure joints, torsion, bending and folding of the multi-body variable-structure satellites can be achieved, each variable-structure satellite comprises three loads, two second variable-structure joints and a satellite element, and the three loads are connected end to end through the two second variable-structure joints; the multi-body variable-structure satellite can be freely combined through the first variable-structure joints and the second variable-structure joints, and 512 types of spectrum self-reconfiguration can be achieved for on-orbit tasks.

The present application belongs to the field of shipping, and particularly relates to a kind of balanced regulation method of LNG ship formation fusing virtual connection and distribution prediction.The method first characterizes the multi-body system of LNG ship formation;The multi-body system sets up a virtual connection relationship between ships to represent mutual influence.Using the multi-body system, the risk state vector corresponding to the ship navigation state is generated, and then the risk prediction vector is generated in combination with the virtual connection relationship;The risk prediction vector of each ship is input into the pre-trained risk prediction model based on time series data, the local risk of the ship is predicted and fused into the global risk of the formation;According to the global state and risk level, the preset control strategy experience set is queried to obtain the optimal control strategy;And when the yaw angle or pitch angle of any ship exceeds the safety threshold, the balanced control instruction is issued to it.The present application solves the problem of lack of balanced control strategy at the ship formation level in the prior art, and ensures the navigation stability of LNG ship formation.

The application provides a test method, device and medium for multi-body separation trajectory prediction under sudden wind disturbance. The method according to the application comprises: initializing a test environment, determining a parallel mechanism configuration for driving six-degree-of-freedom motion of a secondary aircraft under a preset condition, and calibrating positioning accuracy and precision of a three-degree-of-freedom motion driving mechanism of a primary aircraft and a parallel mechanism of six-degree-of-freedom motion of the secondary aircraft; performing linkage test; performing test preparation work; driving the primary aircraft and the secondary aircraft to move according to the pose of the primary aircraft and the secondary aircraft at the next moment; determining a wind tunnel safety boundary, and giving coordinates of easy collision points of the secondary aircraft at each moment; calculating a safety margin according to the easy collision point coordinates of the safety boundary, predicting collision through the safety margin, and obtaining trajectory capture test data of all dangerous region separation states. The technical solution provided by the application can realize multi-body separation motion trajectory prediction under a changing wind field.

A multi-body coupled attitude control method and system based on zero-force control, which obtains the disturbing torque generated by the movement of the rotating mechanism between the satellite platform and the rotating mechanism; calculates the compensation torque according to the disturbing torque and the expected zero torque, and controls the corresponding rotating mechanism to act according to the compensation torque to offset the influence of the movement of the rotating mechanism on the control of the satellite platform. The present invention uses the rotating mechanism between the satellite platform and the payload as an intermediate medium, and controls the action of the rotating mechanism according to the compensation torque to achieve the compensation of the satellite platform, reduces the influence of the payload rotation on the control of the satellite platform, improves the attitude control accuracy and stability of the satellite platform, realizes the decoupling of the satellite platform control and the payload rotation, and can meet the satellite platform control requirements when providing different spatial orientations for multiple payloads simultaneously.

The invention provides a multi-body dynamic modeling and simulation method and system for soft refueling equipment, and belongs to the technical field of aerial refueling hose modeling, and the method comprises the steps: building a variable-length multi-body dynamic model based on a connecting rod hinge structure for a hose taper sleeve assembly; based on the model, deducing a kinematics equation, and calculating the position, speed and acceleration of each hinge node under an inertial system; carrying out stress analysis on the basis of the model, deducing a kinetic equation, and calculating external force borne by each hinge node; based on the kinematic equation and the kinetic equation, establishing a multi-rigid-body associated algebraic equation set and solving to obtain the tension between the connecting rods; and performing simulation based on the model, the kinematic equation and the kinetic equation, and analyzing the dynamic characteristics of the hose taper sleeve assembly under the actions of airflow disturbance and the refueling machine under different flight conditions. Through fine modeling and simulation, the docking efficiency and stability of air refueling are improved.