151 results about "Dynamical simulation" patented technology

In one embodiment, a method for simulating organ dynamics includes generating a sequence of three-dimensional models of an organ during different stages of observed dynamic motion, generating a deformation transfer function from the sequence of three-dimensional models, generating a pressure-volume curve from the sequence of three-dimensional models, and generating an organ deformation model that simulates dynamic motion of the organ.

A path planning device includes: an initial position and posture path acquiring unit which acquires an initial position and posture path including a plurality of nodes connecting present position and posture of a control target to target position and posture and which configures a rigid body corresponding to the control target in each node in the position and posture path; an interference detector which detects interference with the control target by an obstruction; an external force calculator which calculates an external force for each rigid body; and a multi rigid body system dynamics simulation unit which performs a multi rigid body system dynamics simulation on a plurality of equations of rigid body motion and which acquires positions and postures of the control target at times corresponding to the nodes in the position and posture path.

The invention provides a visual gas hydrate dynamic experimental device. The visual gas hydrate dynamic experimental device comprises a visual electromagnetic stirring reaction still, a voltage stabilizing pre-cooling gas supplying unit, an gas exhaust unit, a liquid charging / discharging unit, a temperature control unit and a data collecting and processing unit, wherein the visual electromagnetic stirring reaction still is used for mixing experimental gas and experimental liquid in the reaction still for reaction to form and decompose hydrate; the voltage stabilizing pre-cooling gas supplying unit and the gas exhaust unit are used for supplying pre-cooling experimental gas for the visual electromagnetic stirring reaction still and discharging gas; the liquid charging / discharging unit is used for injecting the experimental liquid to the visual electromagnetic stirring reaction still or discharging the experimental liquid; the temperature control unit is used for controlling the temperature change of the visual electromagnetic stirring reaction still; the data collecting and processing unit is used for collecting, processing, saving and analyzing kinetic parameters during a hydrate formation and decomposition process. According to the visual gas hydrate dynamic experimental device, numerous defects of a common hydrate dynamic experimental device are overcome, the kinetic properties in a nucleation phase and a growth phase of gas hydrate can be accurately determined, and the experimental device is simple, economical and convenient to operate.

The invention mainly relates to a dynamical joint simulation analysis method of a door system of a rail transit vehicle, and the method mainly comprises the steps as follows: (1) a system is subjected to three-dimensional modeling and a three-dimensional model is converted to a neutral file in a SolidWorks environment to be imported into ADAMS (automatic dynamic analysis of mechanical systems); (2) the modal analysis of a flexible body component is conducted in Ansys, and converted to a neutral file to be imported into the ADAMS to replace a corresponding rigid body model; (3) a simulation model is preprocessed; (4) a system control model is built in Matlab, the door system is subjected to simulation control by an ADAMS / Control module to accomplish the kinematic and dynamical simulations of the whole system; (5) an experimental test platform is constructed, and a motion experimental test of the system is conducted; (6) a simulation result is compared with an experimental result, and the model is modified continuously; and (7) motion simulations of opening and closing a door and simulating a practical operating condition are conducted to search an optimal door control system mode.

The invention provides a soft tissue deformation and cutting simulation method based on position dynamics. The method comprises the following four steps: grid preprocessing: according to an original triangular grid and a tetrahedron grid, and calculating a texture coordinate of each peak, calculating a set of edges in the grid, setting dynamics simulation parameters, and generating an improved tetrahedron grid; the deformation calculation of a soft tissue object: according to the current positions and the stressing situation of the peaks of the grids, calculating the positions of the peaks of the grids at a next moment according to the position dynamics; updating during grid topology change: according to an intersection situation of a cutting plane and grid intersection points, dividing an original tetrahedron, and updating the parameters of a geometric model and a position dynamics model; and visual rendering and touch rendering: displaying the soft tissue object and generating force feedback. The invention can truly simulate a process of cutting soft tissues in a virtual surgery, and exhibits high instantaneity.

A system for reducing distortion at the aerodynamic interface plane of a boundary-layer-ingesting inlet using a combination of active and passive flow control devices is disclosed. Active flow control jets and vortex generating vanes are used in combination to reduce distortion across a range of inlet operating conditions. Together, the vortex generating vanes can reduce most of the inlet distortion and the active flow control jets can be used at a significantly reduced control jet mass flow rate to make sure the inlet distortion stays low as the inlet mass flow rate varies. Overall inlet distortion, measured and described as average SAE circumferential distortion descriptor, was maintained at a value of 0.02 or less. Advantageous arrangements and orientations of the active flow control jets and the vortex generating vanes were developed using computational fluid dynamics simulations and wind tunnel experimentations.

The invention discloses a space robot teleoperation system based on three-dimensional gestures. The space robot teleoperation system comprises a gesture interaction sub-system, a predication simulation sub-system and an information management sub-system, wherein the gesture interaction sub-system is used for collecting and preprocessing human gesture information through gesture collecting equipment; the prediction simulation sub-system is connected with the gesture interaction sub-system, and is used for checking the legality of a teleoperation command sent from the gesture interaction sub-system, monitoring the current status data of a space robot, predicting the next status of the space robot through dynamical simulation and carrying out three-dimensional real-time display on the prediction status and current status of the space robot through a three-dimensional display module; the information management sub-system is connected with the prediction simulation sub-system, and uploading of the teleoperation command and downloading of monitoring status data are realized through communication between a ground station and the space robot. By using the system, the space robot can be accurately controlled to complete a series of tasks such as on-orbit maintenance, on-orbit module replacement and on-orbit fuel adding in real time.

The invention discloses a multi-GPU molecular dynamics simulation method for structural material radiation damage. The method comprises the following steps: initializing; dynamically dividing grids for each node; performing inter-node communication; establishing a sorting cellular list on GPU; updating time step; finding the corresponding relationship between particle and grid number according to the coordinate of the particle; forecasting the displacement, speed and accelerated speed of the particle; calculating the stress of each particle; utilizing the stress to rectify the displacement, speed and accelerated speed of the particle; ensuring the constant temperature of the system according to the ensemble correcting speed; utilizing a periodic boundary condition to correct the position of the particle; storing a current calculation result; and iteratively executing the above steps till reaching preset step number. The method can be utilized to high-efficiently and conveniently simulate the material radiation damage process on larger spatial and temporal scale and to explain the long-time evolution law of the radiation damage at micro-scale.

In some embodiments, systems for simulating thermal behavior in energy usage simulators are provided, the systems comprising: at least one hardware processor that: induces an event trigger to an environment, wherein the event trigger changes the behavior of the environment; performs computational fluid dynamics simulations on an environment based on a description of the environment to generate transient temperatures; generates a thermal map of the environment; predicts thermal behavior in the environment based on the thermal map; wherein thermal behavior includes division distribution, temporal distribution, and hysteresis; computes physical performance metrics based on the thermal behavior and on efficiency models; generates a resource utilization matrix (RUM) based on both the thermal behavior and workloads of equipment in the environment; generates a computational performance matrix based on the RUM and a supplied performance model; and computes computational performance based on the RUM and on performance models.

The invention relates to a protein folding parallel predicting method. The method includes the following steps: obtaining different protein structures through molecular dynamics simulation; setting different temperatures, and obtaining more protein structures with different conformations; partitioning the protein structures with different conformations through a conjugate cap molecule partitioning method, decomposing amino acids from proteins, and wearing a conjugate cap on each amino acid; calculating out the electrostatic potential of molecular fragments through quantum mechanics software to fit out the electric charge of each atom in each amino acid molecular fragment, and updating the electric charge of atoms in a molecule force field. To research protein folding, the scheme of considering a protein polarization effect and a copy interchange-based method are organically integrated, and then two difficult problems of atom interaction potential and a sampling technique in dynamics simulation can be overcome in order to achieve a good effect in protein folding simulation.

The invention discloses a molecular dynamics accelerating method based on CUP (Central Processing Unit) and GPU (Graphics Processing Unit) cooperation, which aims to provide a molecular dynamics accelerating method based on CUP and GPU cooperation at a lower cost. The technical scheme is executed by the following steps that: a ''grid-unit'' structure for storing molecular information is built on a to-be-simulated molecular system by a computer configured with a CPU and a GPU; the grids are dynamically applied and processed by the CPU and GPU; when the grids are processed, the CPU processes the grids by regarding cells as the unit; and the whole grid is processed by the GPU for simulating the molecular dynamics by efficient cooperation of CPU and GPU. The molecular dynamics accelerating method disclosed by the invention can balance loads among the CPU cores and avoid the phenomenon that the CPU and GPU are in idle and waiting state in statically distributing the calculating tasks. Therefore, the CPU and GPU can both fully develop the calculating properties. The use ratio of the whole computer system is improved and acceleration of molecular dynamics at lower cost is realized.

The invention relates to a calculation method for predicting the multi-polar expansion attribute of a dipeptide model through a BP neural network. The calculation method for predicting the multi-polar expansion attribute of the dipeptide model through the BP neural network comprises the following steps that the structures of different dipeptide conformations are optimized through quantum mechanics calculation software Gaussian, and physicochemical parameters of the dipeptide conformations and the distance between atoms are calculated; the physicochemical parameters of part of the atoms of the dipeptide conformations and the distance between the atoms are selected for training the BP neural network, so that the physicochemical parameter of the BP neural network is obtained; the other dipeptide conformations serve as a testing set to verify a prediction result based on the BP neural network. According to the calculation method for predicting the multi-polar expansion attribute of the dipeptide model through the BP neural network, quantum mechanics calculation is conducted through the BP neural network instead of quantum mechanics calculation Gaussian software, the physicochemical parameter information such as the energy and the multi-polar distance of dipeptide can be quickly provided according to different conformations on the basis of molecular mechanics simulation based on force field information. Calculation time is greatly shortened and calculation quantity is greatly reduced within the acceptable error range, and the precision in the dynamic simulation process is greatly improved.

A dynamics simulation device for dynamically simulating physical interactions acting on a plurality of objects under an environment where the objects coexist is disclosed. The device includes: nominal value providing means for providing a nominal value Λn of an operational space inertial matrix; nominal inertial force calculating means for calculating a nominal inertial force acting on the operational space by the use of the nominal value Λn of the operational space inertial matrix and a target acceleration value of the physical quantity x; a disturbance observer estimating forces other than the nominal inertial force acting on the operational space as a disturbance; and means for calculating the force f acting on the physical quantity on the basis of the nominal inertial force and the estimated disturbance fd.

The invention discloses an ANSYS and ADAMS-based large-scale antenna dynamical modeling method, and mainly solves the problem that the existing modeling method cannot be used for accurately describing rigid motion of an antenna and cannot consider the problem of rigid-elastic coupling in a movement process of the antenna. The modeling method comprises the steps: based on a finite element model of an elastic component of a large reflector antenna, according to a modal analysis result, selecting the modality with the maximal contribution to antenna output, replacing node coordinates with a small quantity of modal coordinates to condense the degree of freedom of elastic deformation, and then exporting a corresponding modal neutral file; by establishing the rigid component of the antenna in ADAMS, combining the modal neutral file describing an elastomer, and performing assembly to obtain the dynamical simulation model describing the integral movement of the antenna. The ANSYS and ADAMS-based large-scale antenna dynamical modeling method overcomes the defects of the traditional modeling method, and a development period can be obviously shortened.

The invention discloses a thermally stable lipase as well as a preparation method and applications of the thermally stable lipase. The lipase is S2-210 lipase with the amino acid sequence shown as SEQ ID NO.1, S8-214 lipase with the amino acid sequence shown as SEQ ID NO.2, S14-216 lipase with the amino acid sequence shown as SEQ ID NO.3, or S191-241 lipase with the amino acid sequence shown as SEQ ID NO.4. According to the thermally stable lipase and the preparation method thereof, the unfolding process of Yarrowia lipolytica lipase 2 is stimulated through the long-time high-temperature molecular dynamics simulation, and the main area of protein unfolding and the critical steps for forming the wet molten-globule state are analyzed, so that the key site for transforming the kinetic stability are effectively screened. The thermally stable lipase is heat-resisting, is long in half-life period, and is particularly suitable for being applied in the industry.

The invention discloses a method of computing the interactive force between proteins and DNA through computer simulating. In the method, the NAMD_2.6 computing software and the VMD-1.8.6 analysis software are used for molecule dynamics simulation: firstly the protein structure in the PDB database is made into an appropriate research system, then the system is treated for energy minimization, and when the system is heated to the preset temperature, the system is treated for multi-stage balancing; then molecule dynamics simulation is carried out for the system, the target research objects in the system are marked, SMD simulation is carried out for the system, and finally data are processed and analyzed to acquire change of the interactive force between proteins and DNA, and to calculate the maximum interactive force. The method is characterized by wide range of test objects, easy preparation of experimental material, low requirements to devices, high utilization rate, easy and widely application in the fields of life science, physical chemistry and medicine related to molecule identification and gene representing behaviors.

The invention relates to a simulation analysis platform for thermally-induced micro-vibration response of a satellite-borne flexible accessory, and belongs to the technical field of high-precision spacecraft design as well as dynamical simulation and control. The simulation analysis platform for thermally-induced micro-vibration response of the satellite-borne flexible accessory comprises a data inputting and modeling module, an on-orbit thermal analysis module, an equivalent thermal load derivation module, a high-precision modal analysis module, a high-precision vibration response analysis module and a post-processing module, all of which are connected in a sequence; the output of the previous module serves as an input of the next module; and the analysis platform carries out analysis and simulation research on thermal vibration of an engineering-practical large-scale satellite-borne flexible accessory and research on corresponding software for calculation, and realizes the purpose of rapidly and efficiently obtaining the thermally-induced micro-vibration of large-scale flexible components and coupling vibration response between the components and a satellite. Meanwhile, the simulation analysis platform can promote engineering application, testing and verification of a thermal deformation and thermally-induced micro-vibration simulation technology of the large-scale satellite-borne flexible components, can drive progress of related support technical research and can accumulate a technological base for subsequent research of novel satellite types.

The invention discloses heatproof mutation lipase with high catalytic activity as well as a preparation method and an application of the heatproof mutation lipase. The lipase is S118-177 mutation lipase with an amino acid sequence shown in SEQ ID NO.1 and S122-196 mutation lipase with an amino acid sequence shown in SEQ ID NO.2. The key unfolding subregion of a lipase lid 1 region is analyzed through long-time high-temperature molecular dynamic simulation of the unfolding process of Yarrowia lipolytica lipase 2, and key mutation sites are effectively screened. The mutation lipase obtained through actual measurement and screening has high heat stability and catalytic activity and is particularly suitable for being applied industrially.

The verification system for fast autonomous deep-space optical navigation control prototype belongs to the field of semi-physical simulation system based on virtual reality. It includes the autonomous optical navigation control and dynamic simulation system to be verified with the selected landed planet and area to generate the navigation information and control command of deep-space detector to complete the dynamic simulation of the deep-space detector; a target simulating system to generate the 3D virtual environment the deep-space detector faces and to be shown in the display based on the detector information produced through dynamic simulation; and an optical navigation camera system to take the image on the display and to drive the generation of next step of deep-space detector navigating information and control command and complete the dynamic simulation of the deep-space detector.

Disclosed is a surgical simulator for teaching, practicing, and evaluating surgical techniques. Such a simulator may comprise a cassette of organs, blood vessels, and tissues that may be disposable. The simulator also comprises a hemodynamic simulator and a frame assembly, the frame assembly providing support for the cassette of organs as well as a fluid conduit through which simulated blood flow from the hemodynamic simulator may be connected to the blood vessels of the organs and related tissues. The hemodynamic simulator provides adjustable and variable pressures to the arteries and veins, as well as variable pulse rates, which can be programmed at settings chosen by an instructor or user.

Method of designing and manufacturing a distributor bar for use in a production line comprising a mixing head for providing a viscous foamable liquid mixture, a laminator with a predefined speed of at least 20 m / min, the distributor bar having a central inlet fluidly connected to a number of outlets via a main channel. The method comprises: choosing (3001) a geometry for the distributor bar and defining a set of geometrical parameters; assigning (3002) values to said parameters; creating (3003) a virtual model; simulating (3005) flow in said model by performing a Computational Fluid Dynamics simulation (CFD), taking into account (3004) a non-Newtonian shear thinning model; e) evaluating the simulated flow; building (2007) a physical distributor bar. A distributor bar, a production line, and a computer program product.

The invention discloses a method for optimizing and designing an automobile hub. The method comprises the steps of designing the style for an automobile hub body, carrying out mesh generation on a hub geometric model, establishing a finite element model, processing a load and boundary conditions of the hub, analyzing the automobile hub structural performance and optimizing and designing the hub structure. According to the method, the statics, dynamics analog simulation analysis and fatigue life prediction are carried out on the hub based on the finite element analysis, the hub structure is reasonably arranged, and the potential problem is found out as soon as possible and is modified pertinently. The using quantity of aluminum alloy materials is reduced on the premise that enough strength is guaranteed, the materials at the positions with the excessive strength are fully utilized, the product structure is more optimal and reasonable, the weight is reduced, the product quality is improved, the research, development and design period is shortened, production cost is reduced, and the enterprise market competitiveness is enhanced.

The invention discloses a robot animation method using inverse dynamical simulation. The method includes the steps of a, building a hierarchical structural relation of research objects, to be specific, dividing the research objects into multiple skeletal links; b, analyzing inverse motion of the skeletal links by means of cyclic-coordinate descent; c, restraining joint rotational angles of the skeletal links. The method allows motion condition of targets to be quickly, simply and accurately acquired.

The invention discloses a micro-analysis method applied to the rock material I type crack initiation and expansion process. The method comprises the following steps that 1, a micro model for SiO2 crack initiation is built; 2, the working condition is set, and the crack expansion process is simulated and analyzed, and the average stress and the total crack length of the area at one end of a crack are calculated; 3, a crack stress intensity factor is calculated; 4, crack initiation driving force is calculated; 5, a calculation method of the average speed of microscopic crack expansion is built;6, influence rules of different conditions to the crack initiation and expansion process are analyzed. The method has the advantages that it is first put forward that molecular dynamics is adopted forsimulating the rock material microcrack initiation and expansion process, the stress intensity factor calculation method under microscopic molecular dynamics simulation and crack expansion speed calculation method in microscopic simulation are built, and a theoretical basis is provided for deeply analyzing the whole microcrack expansion process such as rock brittle fracture and creep and mechanism study.

The invention provides a method for measuring wind resistance to vegetation and the system thereof. The method comprises the steps that: 3D vegetation images are built, the data of the 3D vegetation images is processed to obtain the vegetation shape parameters; the vegetation shape parameters include the minimum encasing box, leaf area density and trunk equivalent diameter of the vegetation; the vegetation shape parameters are stored in a parameter database; the initial preparations for simulating the wind resistance effects on the vegetation include setting the boundary conditions and initial flow field data for the simulation of the air flow field, dividing the flow field grid, building computational fluid dynamics simulation models including the vegetation wind resistance model based on the vegetation shape parameters and performing the simulation and outputting and displaying the simulation results. The system comprises a remote sensing image acquiring subsystem, a computer unit, and an input and output terminal interacting with the computer modules in real time. The method for measuring wind resistance to vegetation and the system thereof use the vegetation wind resistance models including the vegetation shape parameters and the flow field to simulate and measure the wind resistance to the vegetation, thus increasing the measurement accuracy.

The invention relates to a tree animation simulation method based on a simplification modal analytical method. According to the simulation method, modal analysis is carried out on independent leaves and leaf stalks but not on a whole tree, then a dynamical model of the broad leaves is combined, and a new dynamical model of the tree is set up through matrix transformation according to the hierarchical structure of the tree. The method comprises the specific steps: a dynamical model of a three-dimensional bending cantilever beam is set up, dynamical equations of the bending beam are respectively expressed as a time domain equation and a space domain equation by adopting a variable separation method, an air dynamical model is set up to determine the sum of the external force applied on branches, the dynamical model of the leaves is set up to solve the sum of the external force applied on blades, and a tree model and the dynamical model of the whole tree are set up. The tree animation simulation method can be used for developing three-dimensional tree animation simulation engines, serves as a support for development of virtual reality, game and three-dimensional animation core technologies, and has the important application prospect.

A method of Computational Fluid Dynamics CFD simulation for a product including a plurality of individual components, the method comprising creating a library of known components, including their component geometry and modeling properties needed for simulation, the components being individually meshed within the library; using a graphical user interface GUI to select and place a plurality of components from the library in a desired configuration to make up a CFD model of a product; and CFD simulating the model by scheduling a plurality of solvers, each solver modeling a component group comprising part or all of at least one component, to manage the time of action of the solvers and data exchange between the solvers.

The invention discloses an analog operation system and an analog operation method for a tower crane. The analog operation system comprises an analog unit (2) and a display unit (3), the analog unit (2) comprises a dynamics control module (4) and a graphics module (5), the dynamics control module (4) is used for acquiring operational instructions and dynamically controlling the tower crane and objects in a virtual scene according to the acquired operational instructions, the graphics module (5) is used for outputting dynamics control results, the display unit (3) is used for displaying the virtual scene and the dynamics control results, and dynamics control is realized by the aid of dynamics analog software Vortex. The analog operation system and the analog operation method for the tower crane are lifelike in effect and better in training effect.