14 results about "Equivalent system" patented technology

The invention provides an emergency generator tripping online decision-making method and system based on stability control effect evaluation, and the method comprises the steps: collecting inertia parameters of a generator, and recording the working state data of the generator after a fault occurs and after the fault is removed; performing unit grouping, aggregation and equivalence to further calculate a concavity and convexity index of a phase trajectory, judging whether the system is unstable according to the concavity and convexity index, and forming an equivalent system power angle curve by using a curve fitting method based on measurement data from a fault to a stability judgment moment when the system is unstable; calculating the difference value between the accumulated unbalanced energy and the residual slowable area to calculate the total generator tripping amount, comparing the output of the advanced generator group with the total generator tripping amount to form a generator tripping combination meeting the requirement of the total generator tripping amount so as to construct a potential generator tripping scheme set, carrying out stability control effect evaluation on any scheme in the scheme set in parallel, and selecting the scheme with the minimum generator tripping amount as the optimal generator tripping scheme. Based on the method, the invention further provides an emergency generator tripping online decision-making system. According to the method, the cutting position and the cutting amount can be given at the same time, and the optimal cutting scheme is generated online.

The present application relates to a kind of analytical modeling method of hydraulic switching conversion system considering throttling and switching nonlinearity, belong to the field of hydraulic switching conversion system.The method steps of the present application are:1) establish the input-output relationship of hydraulic switching conversion system element;2) system topology lumped parameter equivalence;3) system processing is single topology form without switching element, structure is invariable, and the nonlinearity characteristics of throttling and switching are retained;4) establish system nonlinear static model and the neighborhood linear dynamic model related to static operating point.This method can reflect the output of system under different parameter configurations and different inputs through analytical expression, and the solving speed is fast.The influence law of system parameters on output is determined, the parameter adjustment range is reduced, and the optimization objective function of system dynamic response is given, which can be applied to solve the output evaluation and parameter configuration difficulty of hydraulic switching conversion system under multiple working conditions.The present application provides guidance for the design and optimization of hydraulic switching conversion system.

The invention discloses a dynamic equivalence method, device and equipment for a power system containing new energy and a medium, which are used for solving the technical problem of large transient simulation error after dynamic equivalence of the power system containing high-proportion new energy. The method comprises the following steps: setting a system before equivalence and a system after equivalence of a power system, and determining a plurality of nodes and corresponding observed quantities; target fault simulation is carried out on the system before equivalence and the system after equivalence, and a first dominant deviation curve is determined; key parameters of the system after equivalence are adjusted in proportion, target fault simulation is carried out on the adjusted system after equivalence, and a second dominant deviation curve is obtained; performing parameter tracing according to the first dominant deviation curve and the second dominant deviation curve to obtain dominant deviation key parameters; and optimizing the dominant deviation key parameters to obtain an updated equivalent system.

The application discloses a kind of local fault-tolerant control methods of rotary steerable drilling tool platform, belong to the field of fault-tolerant control, comprising the following steps: step 1, obtain the random high-order full-drive system model of rotary steerable drilling tool platform with local fault;Step 2, design equivalent control law based on high-order operator, build equivalent system;Step 3, pre-division state domain, design observer based on adaptive gain;Step 4, design output feedback fault-tolerant control law, realize the stable rotary steerable drilling tool platform system under the probability sense.The application realizes the efficient fault-tolerant control for the local fault of rotary steerable drilling tool platform, ensures the stability of rotary steerable drilling tool platform.

The invention discloses an intelligent chassis double-disturbance observer control method, and belongs to the technical field of disturbance control, and the method comprises the following steps: S1, dividing a control system into a non-matching disturbance subsystem and a matching disturbance subsystem; s2, performing disturbance compensation and disturbance estimation on the split matching disturbance subsystem by using an IUDE method to obtain an equivalent system; s3, determining disturbance boundaries of the equivalent system; and S4, using the weight matrix of state control and the weight matrix of disturbance estimation to perform disturbance estimation and compensation on the equivalent system after disturbance boundaries are determined. The method is applied to ride comfort control of an active suspension 1 / 4 vehicle model, the IUDE algorithm and the LMID algorithm effectively achieve estimation of original disturbance and equivalent disturbance respectively, and it is indicated that the method is well achieved in the two aspects of stabilizing a control system and achieving disturbance estimation.

The invention discloses a drag-free control ground verification method based on active control of two-stage torsional pendulum, which comprises the following steps of: suppressing the influence of ground vibration noise on free motion of a test mass in an inertial space to be below 10% of the original noise, and constructing a local inertial reference at the test mass; the problem that inertial space motion is difficult to simulate on the ground by a traditional method is effectively solved; secondly, a high-precision numerical model and a six-degree-of-freedom displacement platform are combined through a hybrid real-time simulation technology, and the high-fidelity on-orbit dynamics simulation capability is achieved. The experimental device has relatively high space-ground consistency, can realize ground high-precision representation of an on-orbit drag-free tracking process of a spacecraft, and provides a new solution thought for ground verification of a space drag-free task. In addition, compared with a complex dynamic equivalent system constructed on the ground, the solution provided by the invention has the characteristics of being easy to implement and low in complexity.

The invention belongs to the technical field of mechanical arm system tracking control, and discloses a mechanical arm system fixed time tracking control method and a mechanical arm system fixed time tracking control system under random interference. The model is expanded to a dynamic model of a multiple-input multiple-output random uncertain nonlinear system; then designing a time-dependent barrier function for processing output constraints, and designing nonlinear transformation for nonlinear control input of the actuator; and then establishing an equivalent system form, designing a non-singular self-adaptive fixed time tracking controller by using a backstepping method, and finally realizing fixed time tracking control on the mechanical arm system. According to the fixed time tracking control method for the mechanical arm system, the preset reference signal can be rapidly and accurately tracked under the condition that random disturbance, actuator nonlinearity and output constraint exist, and the robustness and the control performance of the system can be remarkably improved.

This invention discloses a trajectory planning and optimization control method for a redundant robotic arm. The method includes the following steps: Step 1, designing the desired motion trajectory of the robotic arm's end effector; Step 2, establishing a trajectory planning and optimization control scheme based on a specific robotic arm model; Step 3, transforming the constrained optimization problem into an equivalent system of linear equations based on the Cartesian-Kuhn-Tucker (KKT) conditions; Step 4, constructing an error function using the linear equations obtained in Step 3, and designing a nullable neural network solver capable of handling unknown noise and achieving fixed-time convergence based on a new activation function, thereby obtaining the optimal solution to the constrained optimization problem; Step 5, sending the joint angles or joint velocities obtained in Step 4 to a lower-level computer to drive the robotic arm's end effector to move along the designed desired trajectory. Compared with other methods, this invention, in its new algorithm, can handle unknown noise and achieve fixed-time convergence.

The invention relates to the technical field of turbine base dynamics calculation, and provides a turbine base equivalent damping ratio determination method and system.The turbine base equivalent damping ratio determination method comprises the steps that the structure size and the material attribute of a turbine base are obtained, and a mechanical model of the turbine base is established; based on the mechanical model, determining a mass matrix and a stiffness matrix of the structure so as to establish a free vibration differential equation composed of various materials and an equivalent free vibration differential equation of the overall structure; based on a free vibration differential equation composed of multiple materials and an equivalent free vibration differential equation of the overall structure, according to vibration mode orthogonality, strain energy of a system composed of the multiple materials and strain energy of an equivalent system in all orders of vibration modes are obtained; based on strain energy of a system composed of multiple materials and an equivalent system in each order of vibration mode, an equivalent complex damping coefficient of each order of vibration mode is solved, and the equivalent complex damping coefficient is converted into an equivalent damping ratio. The equivalent damping ratio of the turbine base can be quickly and accurately obtained, and powerful support is provided for engineering practice.

This invention discloses a method, system, device, and medium for tracking control of a robotic arm based on input constraints, relating to the field of intelligent control technology. The method includes the following steps: acquiring physical characteristic data and preset performance indicators of the robotic arm; constructing a constrained system model of the robotic arm based on the physical characteristic data and preset performance indicators; performing an equivalent system transformation on the constrained system model to obtain an unconstrained system model; constructing the Hamilton-Jacobi-Bellman equation based on the unconstrained system model and the optimal control strategy of the robotic arm; solving the Hamilton-Jacobi-Bellman equation using an adaptive dynamic programming method to obtain the optimal control law, and controlling the robotic arm according to the optimal control law. This invention solves the technical problem that existing robotic arm control methods cannot achieve optimal control while satisfying preset performance indicator constraints and overcoming asymmetric input limitations.

The present application relates to the technical field of mechanical structure fatigue test and durability verification, in particular to a non-equal amplitude interval random load equivalent system and method, the system comprises preprocessing, feature extraction, clustering classification, optimal classification number determination, initial equivalent spectrum construction, loading sequence correction and simulation verification module. The method is: first, the original load spectrum is preprocessed and the cycle characteristics are extracted, the optimal classification number is determined by hierarchical clustering and multi-objective weighted comprehensive evaluation index, the initial equivalent spectrum is constructed, and the reference fatigue life and damage of the initial equivalent spectrum are obtained through simulation. Based on the Corten-Dolan model, a correction factor sensitive to the loading sequence is constructed, the simulation result is corrected, the life deviation caused by the loading sequence is compensated, and finally the error is ensured to be less than 15%. The present application retains more than 99% of the pseudo-damage of the original spectrum, shortens the loading time by 80%, balances the efficiency and accuracy, and is suitable for bench verification of complex mechanical structures such as electric drive systems.

The application belongs to the technical field of mechanical arm system tracking control, and discloses a mechanical arm system fixed time tracking control method and system under random disturbance, which firstly establishes a mathematical model of the mechanical arm system under random disturbance affected by actuators and output constraints, and extends the mathematical model to a dynamic model of a multi-input multi-output random uncertain nonlinear system; then, a time-dependent barrier function is designed to process the output constraint, and a nonlinear transformation is designed for the nonlinear control input of the actuator; then, an equivalent system form is established, and a non-singular adaptive fixed time tracking controller is designed by using the backstepping method, so that the fixed time tracking control of the mechanical arm system is finally realized. The mechanical arm system fixed time tracking control method provided by the application can realize fast and accurate tracking of the preset reference signal under the conditions of random disturbance, actuator nonlinearity and output constraint, and can significantly improve the system robustness and control performance.

The application discloses an industrial robot control method, device and equipment and a storage medium, relates to the technical field of intelligent control, and comprises the following steps: acquiring physical characteristic data and a preset performance index of an industrial robot; constructing a constrained system model of the industrial robot according to the physical characteristic data and the preset performance index; performing equivalent system conversion on the constrained system model to obtain an unconstrained system model; constructing a Hamilton-Jacobi-Bellman equation according to the unconstrained system model and an optimal control strategy of the industrial robot; and solving the Hamilton-Jacobi-Bellman equation by using an adaptive dynamic programming method to obtain an optimal control law, so that the industrial robot is controlled according to the optimal control law. The application solves the problem that the existing industrial robot control method cannot realize optimal control while meeting the constraint of the preset performance index, and realizes high-precision control of the industrial robot.

The invention discloses a flight quality evaluation method and device based on time-domain low-order equivalent system fitting, equipment and a medium, relates to the technical field of aerospace system design and simulation analysis, and is used for processing flight test data of an aircraft. Discretizing the state equation, performing recursive calculation on the initial state and parameters of the aircraft by using a discretized matrix, and constructing a discrete equivalent system model; setting a value range for a to-be-identified parameter to generate an initial population, inputting a parameter vector in the initial population into the discrete equivalent system model, performing selection, crossover and mutation operation on the initial population based on the calculated fitness, introducing an elitism strategy until a convergence condition is met, and obtaining an optimal parameter; and processing the to-be-identified parameters by using a least square method to obtain fitting parameters so as to extract key parameters and evaluate the flight quality of the aircraft, so that the fitting precision and robustness of the low-order equivalent system are improved, and the robustness and fitting precision of the model are improved.