15 results about "Generalized coordinates" patented technology

The invention relates to the technical field of new energy power generation and control, and discloses a new energy station operation decision support system based on multi-objective optimization, which comprises a multi-source state space reconstruction module, a Riemannian manifold geometry engine module, a self-adaptive inertia Hamiltonian evolution module and a symplectic geometric integral and instruction mapping module. The system collects station data to construct a dimensionless state space, constructs a Riemannian metric tensor according to physical constraints to reconstruct a Riemannian manifold space, and calculates a geometric connection strength factor; the factor is used to adaptively modulate a virtual inertia matrix, and a dissipative Hamiltonian kinetic model is constructed; and finally, solving the steady-state generalized coordinates through a pungent-preserving numerical integration algorithm, and decoding the steady-state generalized coordinates into an equipment control instruction. According to the method, physical constraints are converted into geometric measurements, and a self-adaptive inertia mechanism is introduced, so that the problem of optimization convergence under multivariable strong constraints is solved, and the safety and accuracy of a control instruction are ensured.

The invention discloses a tethered satellite system dynamics modeling method considering perturbation factors. The tethered satellite system dynamics modeling method comprises the steps that a geocentric coordinate system, an orbital coordinate system of a Kepler orbit where a tethered satellite system is located and a body coordinate system of a unit satellite are established; according to the movement of the centroid of the tethered satellite system on the orbit, the generalized coordinates are the distance from the centroid of the system to the earth center and the true anomaly of the orbit, the Lagrange function of the centroid of the system is obtained; according to the movement of the unit star relative to the centroid, the generalized coordinates are the distance between the unit star and the centroid, the relative first rotation angle and the relative second rotation angle, the relative Lagrange function of the unit star is obtained; comprehensively considering perturbation factors to obtain non-spherical earth, third gravitational force and solar pressure perturbation potential energy; establishing a system kinetic equation considering comprehensive perturbation factors; and obtaining a complete Lagrange equation of the tethered satellite system. The error problem caused by the fact that the master satellite directly serves as the mass point of the system and the influence of comprehensive perturbation on system motion is not considered is solved, and the number of the slave satellites is not limited.

The invention discloses an all-digital quantitative converter valve multispectral monitoring data fusion method, which comprises the following steps: establishing a converter valve element-level generalized coordinate model which comprises a three-dimensional data set of element static characteristics, space field distribution characteristics and time-varying reference characteristics; acquiring infrared and ultraviolet spectrum data of the converter valve, and mapping heterogeneous image data to a unified physical space of the generalized coordinate model by calculating a scale factor and a spatial resolution factor; extracting a multi-dimensional state feature vector, and calculating a mahalanobis distance by using a reference vector constructed by historical data and a covariance matrix; and the element deviation degree is evaluated according to the mahalanobis distance numerical value, and if the element deviation degree exceeds a preset dynamic threshold value, the fault type is judged by calculating the normalized contribution degree of the thermal field and electric field components to the mahalanobis distance. According to the method, conversion from a qualitative image to a quantitative value is realized, and an early compound fault with a single physical quantity not exceeding the standard but extremely low joint probability can be identified.

This invention relates to the field of multibody system dynamics, specifically a dynamic modeling method for simulating the flight motion of a morphing aircraft with an arbitrary number of rotating components. The method first abstracts the morphing aircraft as a tree-like multibody system containing virtual rigid bodies and virtual hinges. Rigid bodies and hinges are uniformly numbered using a depth-first traversal search, with the relative rotation angles between rigid bodies used as generalized coordinates. Then, a path matrix is ​​used to describe the system topology, and the center-of-mass velocity, center-of-mass acceleration, angular velocity, and angular acceleration of each rigid body are derived using the generalized coordinates. Next, based on the above kinematic parameters, the deflection velocity, deflection angular velocity, generalized active force, and generalized inertial force are calculated and substituted into the Kane equations to establish the multibody system dynamic equations. Finally, the dynamic equations are solved, and the motion state is updated according to a set time step, repeating the process until the simulation of the set duration is completed. This invention has strong versatility and good scalability, and is applicable to the flight motion simulation of morphing aircraft with an arbitrary number of rotating components.

The application discloses a kind of dynamics analysis and attitude control methods of electric power multi-rope structure, belong to the dynamics and control field of spacecraft orbit and attitude.The application implementation method is: based on the operation law of vector array, six generalized coordinate dynamics equations of electric power multi-rope structure are derived by Lagrange equation;Through the dynamics analysis to electric power multi-rope structure, the dynamics model of electric power multi-rope structure is constructed, the coupling dynamics characteristics between tether and host star are characterized by the dynamics model of electric power multi-rope structure;Through the extended time-delay self-synchronization control strategy, the attitude of virtual pole is controlled based on the dynamics equation of virtual pole attitude angle and the dynamics equation of virtual pole attitude angle;The attitude of host star is controlled based on the dynamics equation of host star attitude angle, the dynamics equation of host star attitude angle, the dynamics equation of host star attitude angle γ, realize the purpose of simultaneously stabilizing virtual pole and host star attitude movement, reduce the complexity of control system.

This invention relates to a time-domain calculation method for the dynamic response of suspended tunnels under multi-load coupling, belonging to the field of dynamic response analysis of suspended tunnels. Addressing the problems of poor versatility and difficulty in handling multi-load coupling and structural variations caused by inconsistent governing equations in traditional methods, this invention proposes establishing a unified equation of motion for the tunnel body. This equation is decomposed into a system of generalized coordinate ordinary differential equations using the modal superposition method. An implicit Newmark-β method is employed for solving the equations, and a sub-loop iteration mechanism is embedded to achieve dynamic coupling between loads and tunnel motion. By independently modeling anchor cable constraint reactions and using a modular environmental load interface, the method is compatible with complex terrain and various load coupling effects. This invention improves the versatility and computational efficiency of dynamic response analysis of suspended tunnels, solves the accuracy and stability challenges under multi-load interaction, and provides a reliable basis for engineering design.

This invention discloses a method for predicting the pose error of a machine tool slide and the force on the slider, specifically for a double-guide-rail, four-slider linear motion system. First, a unified geometric and mechanical model of the system is established. The guide rail is abstracted as a continuous, smooth curve in space, and the interface between the guide rail and the slider is assumed to be continuous, uniform, and linearly elastic, with constant stiffness coefficients per unit length in both directions. The slide and guide rail are considered rigid bodies. Then, based on the model, the system is decoupled between the horizontal and vertical planes, using the position and attitude errors of the slide as generalized coordinates. Based on deformation compatibility conditions and the principle of minimum potential energy, a balance equation is established between the slide pose error caused by the guide rail contour error and the force on the slider. Solving this equation yields the slide pose error, which is then substituted into the slider force expression to obtain the force and torque distribution of each slider. This method enables the prediction of the multi-degree-of-freedom pose error of the slide and the force state of each slider throughout its entire stroke.

The invention relates to a method for efficiently calculating the temperature of a spacecraft structure in a thermal environment, and belongs to the technical field of spacecrafts. Establishing an antenna model based on finite element software, extracting a thermal parameter matrix, and establishing a traditional heat conduction equation; secondly, simulating a multi-orbit periodic temperature field through spaceflight thermal analysis software, and storing a transient temperature sample; secondly, processing a temperature sample by adopting intrinsic orthogonal decomposition (POD), and constructing a POD base mode to realize ten-thousand-dimensional model order reduction; thirdly, establishing a dimensionality reduction heat conduction equation, modeling a radiation heat flow item of the dimensionality reduction heat conduction equation by a feedforward neural network, and implicitly fitting quadruple nonlinearity through a ReLU activation function by the network by taking a temperature generalized coordinate as an input; finally, neural network expression is combined with a POD method, and a complete low-order nonlinear radiation heat conduction equation is established; the method has both physical mechanism completeness and calculation efficiency, wherein the model dimension is reduced by two orders of magnitude, and the real-time processing requirement of a satellite-borne platform is met; the neural network retains the radiation nonlinear nature, and the prediction precision is high.

A method for determining the hinge reaction torque in the event of a holding-moment hinge deployment impact includes: establishing the system dynamic equations; setting the current values ​​(HoldMarker_H5, HoldMarker_H6) of the holding hinge flags for hinges H5 and H6, and the updated values ​​(HoldMarker_H5_update, HoldMarker_H6_update) of the holding hinge flags for hinges H5 and H6; updating the system generalized coordinate matrix q, the generalized coordinate first-order derivative matrix with respect to time, and obtaining the system generalized coordinate q at the next moment. i The constraint reaction force of each hinge is compared with the structural strength of the hinge. This invention solves the problem of high safety design and testing costs of the entire satellite hinge caused by the large impact torque during satellite antenna deployment.

The application provides a character recognition method and system based on a Hamiltonian shape conservation network, a medium and equipment, belonging to the technical field of character recognition based on deep learning. The system comprises an input module, a feature extraction module, an initial feature generation module, an energy conversion network ETN, a Hamiltonian dynamics evolution network HDNN and a Transformer decoder. The input module acquires an optical character recognition (OCR) image and performs preprocessing; the feature extraction module performs feature extraction on the preprocessed OCR image to obtain a spatial feature map F; the initial feature generation module performs serialization processing and semantic conversion on the spatial feature map F based on Mamba technology to obtain initial generalized coordinates and initial generalized momentum of a Hamiltonian system; the Hamiltonian dynamics evolution network HDNN performs Hamiltonian dynamics evolution according to and according to the Hamiltonian energy conservation, and outputs an evolution result; and the Transformer decoder obtains a character recognition result through decoding, thereby improving the character recognition accuracy in a complex writing scenario.

This invention discloses a theoretical model for spiral self-feeding straightening of pipes, including, under the assumption that the rotation axis of the pipe coincides with the bending plane and axial roll of the pipe is ignored, establishing the total kinetic energy of the pipe based on the thin-wall assumption. T The theoretical formula is derived; neglecting the plastic dissipation of the pipe, a simplified potential energy model for the pipe is established based on the unified curvature theorem of reciprocating bending and the bidirectional effect. V The theoretical formula is used to model the motion trajectory of the pipe based on the Lagrange equation, thereby obtaining a set of motion trajectory equations. These equations include the circumferential bending angle of the pipe, the helical azimuth angle of the pipe, and the axial self-feed displacement. s The coupling relationship between them; where the Lagrange equation is, Q q For the generalized forces acting on the pipe, L For Lagrange units, q For a generalized coordinate system, , for q The first derivative.

The application discloses a knowledge graph entity field conflict detection method based on semantic processing and relates to the technical field of natural language processing, and comprises the following steps: S1, generating a static semantic feature vector by encoding entity attribute features through semantics; S2, calculating the vector from a semantic particle to a category clustering center as field gravity; S3, iteratively solving the change rate of the generalized coordinates and the generalized momentum of the semantic particle through a Hamilton equation; S4, calculating the tangent space Jacobian matrix of the dynamic state sequence and the local Lyapunov index of the semantic particle; S5, performing reverse time integration on the Hamilton equation; S6, generating a semantic dissipation coefficient by using a Langevin equation parameter; and S7, correcting the entity attribute features. The application overcomes the limitations of traditional methods, such as the ignorance of the dynamic evolution mechanism, the difficulty in detecting implicit conflicts and the non-optimization of the correction strategy, and provides an efficient solution for the dynamic consistency maintenance of a knowledge graph.

This invention discloses a unified modeling method for controlled seismic sources and near-surface surfaces based on GLS, relating to the fields of geophysical exploration and controlled seismic sources. It constructs a near-surface porosity-elastic model, improving the simulation accuracy of the interaction between the weight, the base plate, and the pore fluid. The method uses a generalized coordinate system primarily composed of the displacement and velocity of the weight, the ground, and the fluid. Under GLS theory, it establishes an energy structure function constrained by a swept-frequency signal. Substituting this into the Euler-Lagrange equations, it derives dynamic equations considering the characteristics of the near-surface pore structure. Then, the Newmark-Beta method is used to solve the equations to complete simulation experiments of the input and output signals of the controlled seismic source. The model of this invention fully considers the characteristics of the near-surface pore structure and its vibration energy attenuation mechanism, significantly improving the modeling capability of existing controlled seismic source systems for the response of porous media. Its parameter matrix clearly characterizes the mass, stiffness, and damping coupling relationships of the weight, the base plate, the ground skeleton, and the pore fluid.

The application relates to a rigid-flexible coupling dynamic modeling method and device for height adjustment of a paddy field leveler. W O W Y W And a generalized coordinate system X1O1Y1; according to the vibration theory of an Euler Bernoulli beam, a transverse vibration mode function of the flexible beam under boundary conditions is obtained; according to the two-dimensional world coordinate system X W O W Y W , the generalized coordinate system X1O1Y1 and the transverse vibration mode function of the flexible beam, kinetic energy and potential energy of the flexible beam system are calculated; the force of the force equivalent spring exerted by the height cylinder for controlling the height movement of the leveler on the flexible beam is calculated to obtain the driving torque of the hydraulic cylinder of the flexible beam; the kinetic energy, the potential energy and the driving torque of the flexible beam system are substituted into the Lagrange equation, and the Lagrange equation is discretized by using the assumed mode method to obtain a transverse displacement function of an arbitrary point on the flexible beam changing with time when the height of the flat blade is adjusted. The method can accurately perform kinematic modeling on the flexible beam.

The application discloses a centering tracking control method and device based on FTESO and PNTSMC; the method comprises the following steps: a dynamic model of a centering platform is established, vertical displacement, pitch angle and roll angle of the centering platform are taken as generalized coordinates, and external disturbance and unmodeled dynamics are modeled as lumped disturbance; based on a finite time extended state observer, velocity states of the generalized coordinates and the lumped disturbance are estimated in real time; based on a pre-defined time nonsingular terminal sliding mode control strategy, a control law is designed; the control law controls driving force of a hydraulic cylinder based on disturbance estimation value provided by the finite time extended state observer, so that the centering platform can track an expected trajectory within a preset time. The application can realize fast, accurate and robust tracking of a pose of the centering platform, and allows a user to preset a convergence time, thereby significantly improving performance and reliability of an automatic centering process.