151 results about "Dynamical simulation" patented technology

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.

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.

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.

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 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.