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90 results about "Rigid body dynamics" patented technology
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Rigid-body dynamics studies the movement of systems of interconnected bodies under the action of external forces. The assumption that the bodies are rigid, which means that they do not deform under the action of applied forces, simplifies the analysis by reducing the parameters that describe the configuration of the system to the translation and rotation of reference frames attached to each body. This excludes bodies that display fluid, highly elastic, and plastic behavior.
Dynamics performance parameter optimizing method of high-speed train
ActiveCN104765916AImprove operational safetyImproved smoothness and comfortSpecial data processing applicationsNetwork modelDesign space
The invention provides a dynamics performance parameter optimizing method of a high-speed train, relates to the field of parameter design optimizing based on the dynamics simulation analysis of the high-speed train, and aims at effectively replacing a dynamics simulation model of the high-speed train by a comprehensive target neural network agent model and combining the design analysis and the multi-target optimization algorithm of the high-speed train in the multi-disciplinary field to analyze and optimize the dynamics simulation approximation model of the high-speed train. The method specifically comprises the steps of building a multi-rigidity dynamics simulation model for the high-speed train; determining related important input / output design spaces; selecting sampling strategy to obtain a design space sample set suitable for the dynamics performance analysis of the high-speed train; improving the generalization accuracy of the comprehensive target neural network by the bayesian regularization method; adjusting the number of nodes in a hidden layer to build the comprehensive target neural network agent network model of which the error is controlled to be within a certain of range; performing multi-target optimization through the intelligent differential evolution algorithm by using the improved comprehensive target neural network agent network model to obtain the optimized high-speed train design parameters. The method is mainly applied to the dynamics analysis and design optimization of the high-speed train.
Owner:成都天佑创软科技有限公司
Computer simulation of body dynamics including a solver that solves in linear time for a set of constraints using vector processing
Computer simulation of the dynamics of rigid bodies interacting through collisions, stacks and joints is performed using a constraint-based system in which constraints are defined in terms of the positions of the bodies. Displacements caused by reaction forces necessary to ensure that the bodies comply with the position constraints can be calculated and can be done iteratively by updating equations defining the reaction forces and the displacements such that the computation time and memory resources required to perform the calculations is linearly dependent upon the number of bodies and the number of contacts and joints between the bodies. Computational requirements and memory requirements are reduced further by performing the calculations using vector operations.
Owner:ELECTRONICS ARTS INC
Computer simulation of body dynamics including a solver that solves in linear time for a set of constraints
ActiveUS20060217945A1Computation using non-denominational number representationAnimationLinear correlationBody dynamics
Computer simulation of the dynamics of rigid bodies interacting through collisions, stacks and joints is performed using a constraint-based system in which constraints are defined in terms of the positions of the bodies. Displacements caused by reaction forces necessary to ensure that the bodies comply with the position constraints can be calculated and can be done iteratively by updating equations defining the reaction forces and the displacements such that the computation time and memory resources required to perform the calculations is linearly dependent upon the number of bodies and the number of contacts and joints between the bodies.
Owner:ELECTRONICS ARTS INC
Elastic body aircraft adaptive constrained tracking control indirect method
InactiveCN105182742AReduce residual vibrationDoes not destroy tracking control effectAdaptive controlPosition/course control in three dimensionsElastomerDiagnostic Radiology Modality
The invention discloses an elastic body aircraft adaptive constrained tracking control indirect method. The objective of the invention is to solve the technical problem of low possibility of realizing adaptive tracking of reference instruction signals when an elastic body aircraft has input and state saturation constraints. The method includes the following steps that: a feedforward system is designed based on an instruction former, and tracked signals and the pulses of the former are subjected to convolution, so that new forming signals can be obtained and are adopted as the input of a subsequent feedback system; the design of the feedback system is decomposed into a velocity subsystem, a height subsystem and an elasticity subsystem, and the influence of elastic modality in rigid body dynamic is considered as elastic interference, and uncertain parameters and an external disturbance introduction nominal model are used in combination, and therefore, a controlled system can be obtained; and a saturation constrained adaptive control method can be realized for the controlled system through utilizing an instruction filter and an auxiliary system, and tracking for the forming signals in the feedforward system can be realized, and closed-loop system signals can be uniformly and ultimately bounded, and suppression on elastic modality deformation and vibration can be realized.
Owner:BEIHANG UNIV
Method and program solving LCPs for rigid body dynamics
A projected iterative descent method is used to resolve LCPs related to rigid body dynamics, such that animation of the rigid body dynamics on a display system occur in real-time.
Owner:NVIDIA CORP
Flight control debugging protecting device of multi-rotor-wing unmanned plane
InactiveCN104793628AEnsure safetyAvoid property damagePosition/course control in three dimensionsThree degrees of freedomControl system
The invention provides a flight control debugging protecting device of a multi-rotor-wing unmanned plane. By the flight control debugging protecting device of the multi-rotor-wing unmanned plane, self-stabilization performance of a flight control system of the multi-rotor-wing unmanned plane can be debugged, and test safety is ensured. The flight control debugging protecting device of the multi-rotor-wing unmanned plane is based on a rigid body dynamics principle of flight of the multi-rotor-wing unmanned plane and comprises a triangular rack and four changeable flight control debugging modules; the movement type of the multi-rotor-wing unmanned plane is limited through a mechanical structure; three single degrees of freedom, including rolling, pitching and heading, of the flight control system of the unmanned plane can be debugged independently, and the three degrees of freedom can be debugged comprehensively; after control responses of the multi-rotor-wing unmanned plane are observed when the protecting device runs on different modules, actual performance of new skills and new methods which are used by the unmanned plane are clear; and self-stabilization of the flight control system can be subjected to functional partitioning, research and development engineering management is facilitated, debugging of the unmanned plane can be protected, possible property loss caused by blind trial flight is avoided, research and development risks and difficulties are reduced, and development of the industry of multi-rotor-wing unmanned planes is promoted.
Owner:NORTHWEST A & F UNIV
High precision on-line error compensation method for drift error of gyro with suspension rotor
ActiveCN105136170ARealize high-precision real-time compensationRotary gyroscopesMagnetic bearingExcitation current
The invention relates to a high precision on-line error compensation method for drift error of gyro with suspension rotor. Based on the rigid body dynamics basic principle, a gyro disturbed torque model is established; based on an axial direction Lorentz force magnetic bearing, a high precision analytical expression of compensating torque is established; real time on-line measurements of gyro rotor corner and Lorentzen coil excitation current by displacement and current sensors are combined, thereby realizing high precision real time on-line compensation of the compensating torque to the disturbed torque. The invention belongs to the field of aerospace measurement and control technology, and is applied to high precision satellite attitude measurement and optimization design, measurement and calibration of the ground gyro.
Owner:PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
Method and program solving LCPs for rigid body dynamics
A projected iterative descent method is used to resolve LCPs related to rigid body dynamics, such that animation of the rigid body dynamics on a display system occur in real-time.
Owner:NVIDIA CORP
Walking motion planning method for biped walking robot
InactiveCN108089578AAttitude controlPosition/course control in two dimensionsPlanning approachEngineering
The invention provides a walking motion planning method for a biped walking robot. The walking motion planning method takes an omnidirectional moving trolley as a model, takes a condition that the trolley does not overturn as a dynamics constraint condition, considers the dynamics constraints in footprint transform, uses a three-dimensional linear inverted pendulum model between partial discrete footprints, generates a hip trajectory online, and obtains driving joint trajectories through inverse kinematics; and finally, the walking motion planning method adopts a multi-rigid-body dynamics model, adopts a ZMP theory to determine stability, verifies the effectiveness of the joint trajectories, optimizes parameters of the omnidirectional moving trolley and the three-dimensional linear inverted pendulum model, and finally realizes biped walking robot walking motion planning constrained by dynamics under a fast walking condition.
Owner:TSINGHUA INNOVATION CENT IN DONGGUAN
Computer simulation of body dynamics including a solver that solves for position-based constraints
Computer simulation of the dynamics of rigid bodies interacting through collisions, stacks and joints is performed using a constraint-based system in which constraints are defined in terms of the positions of the bodies.
Owner:ELECTRONICS ARTS INC
Method for optimizing performance parameters of movement mechanism of electronic equipment
ActiveCN101639681ASimple structureAccurate methodProgramme controlComputer controlDynamic methodCoupling
The invention provides a method for optimizing performance parameters of a movement mechanism of electronic equipment, which comprises the following steps: performing three-dimensional modeling on theelectronic equipment; respectively establishing a multi-rigid-body dynamic model and a rigid-flexible coupling multi-body model based on the established three-dimensional model of the electronic equipment; adopting a virtual prototype method to obtain the dynamic errors of the models; and optimizing the performance parameters of the movement mechanism of the electronic equipment by taking the minimum dynamic error as a target. Based on a multi-body dynamics method, the method respectively establishes the multi-rigid-body dynamic model and the rigid-flexible coupling multi-body model, optimizes to obtain the structural parameters of the high-precision and high-speed electronic equipment by taking the systemic dynamic accuracy as a target. The method has the advantages of accuracy, convenience, practicability and the like, contribution to improving the design capacity, acquisition of a better product structure and the like.
Owner:HANS CNC SCI & TECH
Rocket-assisted unmanned aerial vehicle launching process multi-field coupling simulation analysis method
ActiveCN110990947AImprove Launch Simulation AccuracyImprove modeling accuracyGeometric CADSustainable transportationUncrewed vehicleComputational model
The invention provides a rocket-assisted unmanned aerial vehicle launching process multi-field coupling simulation analysis method. The method comprises the following steps: (1) dividing the rocket-boosted unmanned aerial vehicle launching process into five stages of fixing the unmanned aerial vehicle on the frame, sliding the unmanned aerial vehicle along the frame, completely separating the unmanned aerial vehicle from the launching frame until the booster finishes working, finishing the work of the booster until the booster is completely separated, and continuously flying the unmanned aerial vehicle; (2) establishing a six-degree-of-freedom kinetic equation set of the unmanned aerial vehicle, and on the basis, establishing a multi-rigid-body kinetic model of the unmanned aerial vehiclelaunching system in ADAMS software; (3) based on the aerodynamic blowing data, establishing an aerodynamic force calculation model capable of calculating aerodynamic force and an aerodynamic moment calculation model capable of calculating aerodynamic moment under different flight attitudes in real time; (4) establishing a flight control system model in the launching process of the unmanned aerialvehicle; and (5) building an unmanned aerial vehicle launching section multi-field coupling joint simulation data interaction platform.
Owner:NO 60 RES INST OF GENERAL STAFF DEPT PLA
Attitude angle rate measurement method based on magnetic suspension control moment gyroscope
ActiveCN104197907ARealize measurementEasy to controlRotary gyroscopesGyroscopeSpacecraft attitude control
The invention relates to an attitude angle rate measurement method based on a magnetic suspension control moment gyroscope. The attitude angle rate measurement method is capable of simultaneously carrying out spacecraft attitude control and spacecraft attitude angle rate measurement. The attitude angle rate measurement method based on the magnetic suspension control moment gyroscope comprises the following steps: building a magnetic suspension rotor dynamical model according to rigid body dynamics and the principle of coordinate transformation; indirectly obtaining an applied moment on a magnetic suspension rotor when a spacecraft and a framework rotate by using resultant moment born by the magnetic suspension rotor and a deflection moment of the magnetic suspension rotor when the spacecraft and the framework are static, wherein the resultant moment and the deflection moment are convenient to be directly measured and calculated; showing an analytical expression of the attitude angle rate of the spacecraft by using the magnetic suspension control moment gyroscope in a rectangular pyramid actuation mechanism according to an inertia moment theorem and an attitude measurement integration principle. The attitude angle rate measurement method based on the magnetic suspension control moment gyroscope is capable of replacing a rate gyroscope of a conventional attitude control system and reducing the volume and the weight of the attitude control system, belongs to the technical field of aerospace control and can be applied to high-accuracy spacecraft attitude control and measurement.
Owner:PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV +1
Stable walking control method and device for biped robot, equipment and readable medium
ActiveCN111674486AStability Control InputReduce complexityProgramme-controlled manipulatorVehiclesState predictionSimulation
The invention discloses a stable walking control method and device for a biped robot, equipment and a readable medium. The stable walking control method comprises the steps: constructing a simplifiedrigid body dynamic model of a biped robot; constructing a centroid state prediction model by using the simplified rigid body dynamic model of the biped robot based on a model prediction control method; simplifying an optimization equation set in the model prediction control method into a quadratic programming equation set according to the centroid state prediction model; solving the quadratic programming equation set to obtain optimized ground reaction force so as to obtain stable walking control parameters; and controlling the biped robot according to the stable walking control parameters. According to the method, a problem is analyzed through the centroid control framework, and analysis of control over all parts of the body in the walking process of the robot is simplified; meanwhile, compared with a traditional feedback control method, the model prediction control method has high predictability, so that the robot has better robustness when walking on an unknown rugged road surface.
Owner:ZHEJIANG UNIV
Distributed dynamic modeling method for multi-leg robot
ActiveCN110083982AReduce complexityQuick updateSustainable transportationDesign optimisation/simulationDynamic modelsContact force
A distributed dynamics modeling method for a multi-leg robot comprises the following steps that (1) based on virtual model control, a trunk single rigid body serving as an object, simplifying legs into virtual actuator input, performing stress analysis, and establishing a single rigid body dynamics model; (2) adopting an iterative leg dynamics model resolving algorithm to establish a leg dynamicsmodel; the leg dynamic model resolving algorithm comprises the following steps: (1) taking a contact point between the tail end of a limb and the environment as a base coordinate system, and extrapolating to obtain an inertia force and a moment borne by the mass center of each rod piece; and (2) starting from the connection point of the trunk and the limbs, taking the force spinor of the limbs acting on the trunk as a controlled quantity, and performing inward pushing to obtain the interaction force spinor of the internal rod piece for realizing the controlled quantity and the contact force spinor of the limbs and the environment. According to the method, the complexity of model establishment is greatly reduced, the dynamics of the multi-leg robot is quickly updated, and the real-time requirement of control is met.
Owner:SHANDONG UNIV
Key parameter identification method for high-speed train dynamics performance design
Owner:SOUTHWEST JIAOTONG UNIV +1
Machine tool moving part realizing method capable of meeting high-acceleration requirement
InactiveCN102043876AReduce static and dynamic stiffness requirementsImprove reliabilitySpecial data processing applicationsNumerical controlMathematical model
The invention discloses a machine tool moving part realizing method capable of meeting a high-acceleration requirement, which comprises: (1) determining working condition parameters of a moving part, such density, elastic modulus, fraction coefficient, basic overall dimension range and selected motor power; (2) taking the load inertia of the part as an optimal design target function, selecting a design variable, determining a constraint condition and establishing an optimal design mathematical model of the moving part; (3) solving an optimal problem by using a MATLAB algorithm, and determining the optimal overall dimension of the moving part; (4) establishing a three-dimensional model of the part; (5) based on virtual prototype technology, performing simulation analysis on the system through multi-steel body dynamic software, and detecting if the acceleration in motion of the part reaches requirement; (6) analyzing the high-acceleration start-up motion of the moving part by using finite element analysis software, and performing improved design of the weak positions of the moving part; and (7) determining the mechanical error of the part operating at high acceleration so as to perform real-time compensation in computer numerical control (CNC) programming. The method realizes the design of the moving part under a complex working condition by a simple method; and while ensuring product quality, the method greatly shortens product development period and reduces development cost.
Owner:BEIHANG UNIV +1
Mechanism reliability calculating method based on multi-factor coupling
The invention discloses a mechanism reliability calculating method based on multi-factor coupling. The method comprises the steps of modeling a mechanism based on multi-rigid-body dynamics, a clearance collision model and a flexible body discretization method to obtain the output value of the mechanism so that multiple influence factors including rod piece size error, assembly error, clearance, friction, load, speed and deformation can be considered, then conducting parameterization on the multiple factors influencing mechanism output in a mechanism model, and finally conducting efficient and accurate mechanism reliability calculation based on the minimum sampling method. The mechanism reliability calculating method is more suitable for practical engineering application due to the fact that more factors are considered.
Owner:HUAQIAO UNIVERSITY
Spraying simulation method based on augmented reality and simulation system
ActiveCN104732864AImproved spraying skillsReduce the cost of trainingEducational modelsDisplay deviceEnvironmentally friendly
The invention relates to a spraying simulation method based on augmented reality and a simulation system. The method comprises the steps that a motion of a spray gun when being operated by an operator to spray on an object and a position and a stance of the spray gun are captured by a motion collector in real time; based on the motion for operating the spray gun and the position and the stance of the spray gun, the spraying effect is calculated by a controller by combining rigid body dynamics and fluid dynamics model; the motion for operating the spray gun, the position and the stance of the spray gun and the spraying effect are stored and assessed by a manager, and the spraying effect and an assessing result are displayed by a displayer. According to the spraying simulation method based on the augmented reality and the simulation system, the training of spraying skill can be carried out by the operator under an emulational stimulation environment in a safe and environmentally friendly manner, the spraying process can be truly experienced, the spraying skill can be rapidly improved based on the assessing result, the skill is converted and applied to the actual spraying work, the training cost is low, and a training field is unlimited.
Owner:WUHAN ONEW TECH CO LTD
Computer simulation of body dynamics including a solver that solves in linear time for a set of constraints
ActiveUS7505883B2Computation using non-denominational number representationAnimationBody dynamicsLinearity
Computer simulation of the dynamics of rigid bodies interacting through collisions, stacks and joints is performed using a constraint-based system in which constraints are defined in terms of the positions of the bodies. Displacements caused by reaction forces necessary to ensure that the bodies comply with the position constraints can be calculated and can be done iteratively by updating equations defining the reaction forces and the displacements such that the computation time and memory resources required to perform the calculations is linearly dependent upon the number of bodies and the number of contacts and joints between the bodies.
Owner:ELECTRONICS ARTS INC
Solving method for composite limitations of operating space paths of industrial robot
ActiveCN105717869AAvoid Path Following ErrorsEfficient solutionNumerical controlControl theoryJoint spaces
The invention provides a solving method for composite limitations of operating space paths of an industrial robot.The method includes the steps that the operating space paths of the industrial robot are set; speed limitation conditions and acceleration limitation conditions of all axes are calculated, and limitation conditions of second derivatives of parameters are calculated according to the speed limitation conditions and acceleration limitation conditions of all the axes; torque limitation conditions of all the axes are calculated according to a rigid body dynamic model and the rotating part paths, and limitation conditions of first derivatives of the parameters are calculated according to the torque limitation conditions; speed limitation conditions and acceleration limitation conditions of operated workpieces are calculated according to the six-dimensional speed spinor of operating space of the industrial robot, and limitation conditions for the parameters are calculated according to the speed limitation conditions and the acceleration limitation conditions; composite limitation conditions for the industrial robot are unified on calculation on limitation conditions of the path parameters.Multiple limitation conditions of joint space and the operating space are effectively solved, and the composite limitations are uniformly shown.
Owner:珞石(北京)科技有限公司
Dynamic modeling and stability control method for folding wing aircraft
ActiveCN110908278AAvoid Linearization ProblemsOvercome limitationsControllers with particular characteristicsKinematics equationsDynamic equation
The invention relates to a dynamic modeling and stability control method for a folding wing aircraft, which comprises the following steps: firstly, an aircraft with folding wings is taken as a multi-rigid-body system, and a multi-rigid-body dynamic model of the aircraft is established; secondly, the function relation between aerodynamic parameters and folding angles in the wing folding process iscalculated; thirdly, decoupling is conducted according to the decoupling conditions in combination with a kinematics equation, a dynamics equation and a navigation equation of the aircraft, a longitudinal motion equation of the aircraft is obtained, and dynamic characteristics of the aircraft are analyzed; finally, a nonlinear term, a coupling term and a parameter time-varying term existing in theaircraft longitudinal nonlinear kinetic model are regarded as total disturbance inside and outside the system, real-time estimation and compensation are conducted on the total disturbance, a PD controller is designed for the compensated system, and decoupling control over a speed channel and a height channel is achieved. According to the method, the modeling process is simplified, and derivationof rotational inertia is avoided; the controller is strong in anti-interference capability, high in control precision and suitable for deformation stability control of various variant aircrafts.
Owner:BEIHANG UNIV
Method for correcting noises and errors in human sports trapped data
InactiveCN1924932ASolve the singularity problemLower quality requirements3D modellingHuman motionComputer science
This invention discloses one human motion noise and error data catching correction method, which comprises the following steps: establishing human geometry mode; setting human quality distribution parameters; inputting human motion data; making parameters of human motion joint; establishing mixture Newton-Euler rigid dynamic force equation based on Euler angle and four element number; establishing physical binds optimization mode; setting optimization overlap times; using secondary program method to solve optimization mode to get human motion data.
Owner:INST OF COMPUTING TECH CHINESE ACAD OF SCI
Multi-wheel individual drive slip frequency steering vehicle united simulation method and system
ActiveCN108508760AImprove accuracyImprove reliabilitySimulator controlClosed loop simulationComputer module
Owner:BAIC GRP ORV CO LTD
Aerodynamic/control integrated coupling simulating technology in aircraft maneuvering process
InactiveCN106019930ABest analog accuracyControllers with particular characteristicsKineticsKinematics equations
The invention discloses an aerodynamic / control integrated coupling simulating technology in the aircraft maneuvering process, and relates to the field of computational fluid mechanics and the field of control systems. The main work implementing process includes the steps of generating a control signal through the compared deviation of the attitude angle of an aircraft and a control target, outputting the control signal to a PID controller module, generating a rudder deviation angle signal after computation, outputting the rudder deviation angle signal to a dynamic mesh module, deflecting a rudder face to a corresponding angle through a dynamic mesh technology, obtaining a dynamic flow field existing after deflection of the rudder face through a Navier-Stockes equation module, generating aerodynamic force and torque signals, outputting aerodynamic force and torque to a rigid body dynamics equation and a kinematical equation, obtaining the flight attitude of the next moment, transmitting the new flight attitude to the PID controller module, and forming a closed-loop numerical simulating circuit. The high-precision simulation of a flight control system is achieved, and the technology can be used for evaluating performance of the flight control system and studying the influences of the aerodynamic force unsteady effect on the control system.
Owner:中国人民解放军63821部队
Method for resolving and solving expected attitude of near-earth orbit spacecraft in sunlight reflection staring
ActiveCN110162069AOvercome defects such as large errorsIn line with engineering practiceAutonomous decision making processAttitude controlStaringQuaternion
The invention discloses a method for analyzing and solving an expected attitude of near-earth orbit spacecraft sunlight in reflection staring. The method comprises the following steps of establishinga target coordinate system according to orbit information of a spacecraft and target longitude and latitude information; establishing components of three axes of the target coordinate system under aninertial coordinate system so as to establish an expected quaternion of the target coordinate system relative to the inertial coordinate system; and further combining a rigid body dynamics basic theory, and finally determining an angular speed and an angular acceleration of the target coordinate system by solving a primary derivative and a secondary derivative so as to determine an integral analysis form of target attitude information. According to the invention, when the spacecraft executes a sunlight reflection staring task, the target angular speed and the angular acceleration do not need to be solved by methods such as difference, and the defects of large error and the like generated by the traditional difference method are overcome; and when the target attitude is solved, shape factors such as the oblateness of the earth and the like are considered, and the method is not based on the spherical assumption of the earth any more and is more in line with the engineering practice.
Owner:BEIHANG UNIV
Spinning speed control method for space flexible electric sail
ActiveCN107908203ASolving Dynamics ProblemsConvenient coupling modelingSpeed/accelaration control using electric meansReference configurationDynamic models
The invention provides a spinning speed control method for a space flexible electric sail, belongs to a field of electric sails and specifically relates to the spinning speed control method for the space flexible electric sail. The method includes steps of 1, establishing a large deformation dynamics model of a flexible rope based on an absolute node coordinate method, determining unit nodes, deducing a constant quality matrix and generalized elastic force in a reference configuration; 2, establishing a central rigid body dynamics model, establishing a 1-DOF (Degree Of Freedom) constraint algebraic equation for a central rotation constraint pair, establishing a 3-DOF constraint algebraic equation for a connection spherical hinge of the flexible rope and the central rigid body; 3, performing stress analysis on the flexible rope and calculating the flexible rope rotation angle acceleration in a dynamic balance state; 4, selecting a control variant and designing speed control rate according to stress analysis and obtaining a speed control torque needed to output by the central rigid body through calculation. The invention solves a problem that speed control of a flexible rope spinningmulti-body system of the flexible sail cannot be realized and can be applied to an electric sail control system.
Owner:HARBIN INST OF TECH +1
Vehicle-road-bridge coupling dynamics analysis method
ActiveCN110532714ARealize failure mechanism analysisIn line with engineering practiceSustainable transportationSpecial data processing applicationsCouplingBridge deck
The invention provides a vehicle-road-bridge coupling dynamics analysis method. The method comprises the steps of building a steel beam model and a linear elastic bridge deck pavement layer model by utilizing finite element software; establishing a multi-rigid-body three-dimensional vehicle body model, a nonlinear tire model and a plate spring suspension model by utilizing multi-rigid-body dynamics software, and assembling to form a multi-rigid-body three-dimensional real vehicle model; compared with the prior art, the multi-rigid-body three-dimensional real vehicle model considers the vehiclesuspension characteristics and the influence of tires on the road surface, and is more consistent with engineering practice, so that a steel bridge vehicle-bridge-road rigid-flexible coupling model is established, and vehicle-bridge-road coupling dynamic analysis is realized; a solid tire model and a viscoelastic bridge deck pavement layer model are established through Abaqus finite element software, a vehicle coupling axial force obtained through vehicle-bridge rigid-flexible coupling dynamic analysis is applied to the solid tire model, and axle rigid-flexible coupling viscoelastic bridge deck pavement dynamic analysis and asphalt pavement damage mechanism analysis are truly achieved.
Owner:SHIJIAZHUANG TIEDAO UNIV
Machine tool design method
InactiveCN101690980AGood stability requirementReasonable meansMilling equipment detailsBoring/drilling machinesMathematical modelPhysical model
The invention provides a machine tool design method, comprising the steps of a) creating a machine tool physical model according to parts processing technology and assembling technology, b) exerting a driving signal to the physical model and measuring the platform dynamic precision, c) transferring the physical model into a mathematical model and solving, d) analyzing the parameters and optimizing the machine tool design. The machine tool design method of the invention directly uses the dynamic property of machine tool as the evaluating object, rigid body dynamics calculation as the manner of analyzing and combined property parameter of motor function element as analyzing and optimizing object, having the advantages of clear target, reasonable method, convenient analysis, etc.
Owner:HANS LASER TECH IND GRP CO LTD +1
Double-shaft balancing design method of V8 type diesel engine
InactiveCN107448546AVerify rationalityGuaranteed correctnessInternal-combustion engine testingInertia force compensationHarmonicDiesel engine
The invention relates to a double-shaft balancing design method of a V8 type diesel engine. The double-shaft balancing design method comprises theoretical design, multi-rigid-body dynamics simulation and rigid-flexible coupling vibration simulation; the theoretical design comprises the steps of selection of air cylinder included angles and crank modes, fitting of an upsetting moment and analysis of harmonic waves and determination of balancing shaft spatial layout modes, phase angles, mass distribution, cross section shapes and parameters; a V8 type diesel engine multi-rigid-body model is built by dynamics simulation, and a double-shaft balancing effect determined by the theoretical design is verified; rigid-flexible coupling vibration simulation aims at the V8 diesel engine which is additionally provided with the double-shaft balancing design to build a diesel engine rigid-flexible coupling model, and stimulation is conducted on the vibration condition of the diesel engine which is additionally provided with a balancing device, and the balancing effect of a double-shaft balancing scheme is verified on the other hand. The double-shaft balancing design method of the V8 type diesel engine has the advantages that the method which combines the theoretical design with the dynamics simulation together is adopted, results in the stages are verified mutually, the correctness of the design scheme is ensured, and the reasonability of the design scheme and the good balancing effect can further be ensured.
Owner:JIANGSU UNIV OF SCI & TECH +1
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