20 results about "Multi body" patented technology

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 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.

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 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.

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.

This invention discloses a multi-body connection and anti-collision device for a floating structure. The floating structure is composed of several floating tubes, including a floating tube anti-collision device, a steel wire cable structure, and an end anti-collision device. The floating tube anti-collision device and the steel wire cable structure are used when the floating tubes are connected side by side. The end anti-collision device is used when the floating tubes are connected through the ends of the floating tubes. The floating tube anti-collision device includes a floating tube anti-collision pad and a metal fixing ring. The floating tube anti-collision pad is made of elastic material and consists of a floating tube anti-collision ball, a floating tube anti-collision grid, a steel wire guide groove, and an anti-collision buffer layer. The floating tube anti-collision ball is integrally set on the surface of the floating tube anti-collision pad. The floating tube anti-collision grid is arranged in the inner layer of the floating tube anti-collision pad. The steel wire guide groove is set in the upper and lower parts of the floating tube anti-collision pad for fixing the steel wire cable. The anti-collision buffer layer is set in the middle of the floating tube anti-collision pad. The metal fixing ring is used for detachable connection of the floating tube anti-collision pad and the floating tubes. The end anti-collision device includes an end anti-collision pad, an end anti-collision ball, and an end anti-collision guide hole.

The invention provides a platform-stand pipe-auxiliary pipe cable multi-body coupling response experiment device and method. The device comprises a marine pipe cable assembly, a multiphase internal flow circulation system, an external flow circulation system, a pipe-soil action system, a platform movement system and a monitoring and data acquisition system. Excitation is applied to the ocean pipe cable assembly through one or more of the platform movement system, the multiphase internal flow circulation system, the external flow circulation system and the pipe-soil action system, so that the floating platform and the ocean pipe cable assembly serve as a plurality of mutually constrained movement bodies, and complex dynamic response is generated under the wind-wave-flow and pipe-soil multi-physics field coupling action. The monitoring and data acquisition system is configured to be used for monitoring structural dynamics response parameters and multi-physical field environment excitation parameters of the ocean pipe cable assembly and the floating platform when the ocean pipe cable assembly acts on one or more of the platform movement system, the multi-phase internal flow circulation system, the external flow circulation system and the pipe-soil action system; therefore, the dynamic coupling behavior among the multi-body systems is represented.

A method (500) and a multi-body system (100) comprising two body segments (101, 102, 103, 104) assembled via joints (105, 106, 107), wherein one of the body segments (104) comprises a camera (110) movable between a first position (P1) and a second position (P2). The method (500) comprises: detecting (501) a reference object (200a, 200b, 200c, 200d) with the camera (110) positioned at the first position (P1); determining (502) a reference value of the reference object (200a, 200b, 200c, 200d); requesting (503) movement of the camera (110) from the first position (P1) to the second position (P2); initiating (504) movement of the camera (110) from the first position (P1) to the second position (P2) while iteratively sampling images of the reference object (200a, 200b, 200c, 200d); determining a current object value of the reference object (200a, 200b, 200c, 200d) based on the sampled images; matching the reference value with the current object value; and determining (505) success of the camera movement based on the matching.

The invention discloses a performance simulation analysis method and device of a coaxial speed reducer, a storage medium and equipment, and the method comprises the steps: binding a multi-body dynamic model and a finite element model of the coaxial speed reducer to form a simulation model of the coaxial speed reducer, and the simulation model of the coaxial speed reducer simulates the working state of the coaxial speed reducer in the actual driving of the vehicle. Therefore, the multi-body dynamic model and the finite element model of the coaxial speed reducer are established, the multi-body dynamic model and the finite element model of the coaxial speed reducer are bound based on the gravity center of each part of the coaxial speed reducer, so that the simulation model of the coaxial speed reducer is formed, and a load is applied to the simulation model of the coaxial speed reducer. According to the method, the simulation model of the coaxial speed reducer simulates the working state of the coaxial speed reducer in the actual driving of the vehicle, and then the dynamic performance simulation analysis of the coaxial speed reducer under the actual working condition is realized, so that the accuracy of the performance simulation analysis of the coaxial speed reducer is improved.

The application discloses a kind of multi-body dynamics-SPH coupling calculation solving method and system, belong to computer simulation technical field, the method is realized by MPMD heterogeneous process group two-way coupling operation of SPH solver and multi-body dynamics solver, wherein SPH master program group executes fluid particle action force calculation and pressure field update, multi-body dynamics slave program group handles rigid body motion response, computationally intensive SPH simulation and logic-intensive multi-body dynamics solution are distributed in different process groups and run, support independent allocation of heterogeneous hardware resources, both sides exchange force, torque and configuration data in real time through MPI intercommunicator bidirectional exchange force, torque and configuration data. The present application does not need to make substantial integrated modification to existing source code, reduces the development complexity and technical threshold, improves overall computing efficiency and resource utilization.

Material property prediction method comprise modelling a periodic structure as a quotient complex (QC). The QC models pairwise and many-body interactions using simplices of plurality of dimensions, and also models periodic material properties by applying a quotient operation over the simplices. A feature vector is then generated for each simplex in the QC, and is updated for each simplex in the QC based on feature vectors of one or both of neighbouring simplexes in the QC and cofaces of the respective simplex, using a message passing scheme. The QC can then be processed with updated feature vectors using a simplex transformer to predict material properties of the periodic structure.

The invention relates to the field of offshore converter stations, and provides a multi-offshore converter station transportation and floating multi-body coupling numerical simulation analysis method and system. The multi-offshore converter station transportation and floating multi-body coupling numerical simulation analysis method comprises the following steps: constructing a multi-body coupling dynamic model consisting of a barge, a connecting unit and an upper module, and carrying out time domain and frequency domain conjoint analysis on a transportation stage; when the upper module is transported to a site and then enters an installation stage, a fender-ship body coupling sub-model is additionally arranged in the multi-body coupling dynamic model, fender parameters are defined, and the fender parameters and constraints of the connecting units jointly form a contact boundary; under the condition of unified sea condition and load input, time-frequency domain conjoint analysis is adopted to determine window judgment and parameter setting results of unfavorable sea condition combination and installation stages. According to the method, the contact nonlinear characteristics of the connecting unit and the fender can be considered at the same time, through the analysis means of combining the time domain and the frequency domain, reproducible and comparable simulation calculation of the whole floating support installation process is achieved, and a basis is provided for engineering decision making.

The application discloses a surface-embedded material point method for a multi-body contact problem, and belongs to the technical field of computational mechanics and numerical simulation. In a first step, a physical model of a multi-body contact system is discretized and parameters are set. In a second step, contact forces are calculated. In a third step, physical quantities of material points of contact bodies are transferred to background grid nodes to obtain node mass, momentum and force. In a fourth step, a grid is updated. In a fifth step, velocities, displacements, stresses and densities of the material points are updated. In a sixth step, background grid physical quantities are reset. In a seventh step, the first, fourth, fifth and sixth steps are repeated to update physical quantities of material points of other contact bodies and to allocate corresponding contact body background grid nodes in a memory. In an eighth step, after all contact bodies are updated, a current time is updated to obtain a dynamic simulation result. The application can accurately represent object boundaries, effectively simulate complex problems such as impact and multi-body contact, and has good stability and low memory consumption.