5 results about "Solution of equations" patented technology

The application discloses a spacecraft magnetic moment attitude control method based on a non-inverse iteration algorithm, and the method establishes a linear periodic model for a spacecraft attitude control system which only relies on a magnetic moment; on the basis, according to a linear quadratic optimal control theory, an optimal controller design problem is converted into a solution problem of a discrete periodic Riccati equation associated with the optimal controller design problem; on the basis of a gradient descent principle, an error function is constructed, and a non-inverse iteration algorithm based on the gradient descent principle is proposed to solve the discrete periodic Riccati equation, so that a matrix inversion operation in a traditional solution method is avoided, and the calculation efficiency and the numerical stability are effectively improved; the obtained Riccati equation solution is used to obtain an optimal state feedback control law, so that the spacecraft attitude optimal control only using the magnetic moment is realized, and a new solution scheme is provided for an attitude control problem of a limited actuator in a space task.

The application discloses an optimization design method of interior ballistic charge parameters of an ultrahigh-speed fragment launching device. The method adopts a multi-objective simulated annealing algorithm, combines an ultrahigh-speed fragment launching device interior ballistic calculation program and a Runge-Kutta equation solution program, and solves the problem that in the design of an ultrahigh-speed fragment charge, the ultrahigh-speed fragment launching device charge design meeting certain test target requirements cannot be quickly and accurately found, and is suitable for solving the optimization target requirements of various ultrahigh-speed fragment tests.

The application discloses a kind of cogeneration system digital twin model construction methods, comprising clear trusted parameter, selecting benchmark condition, establishing equation, solving equation correct solution and constructing digital twin model.The complex cogeneration heat system is analyzed, the reliability of thermal characteristic parameter is clear, and the equation set is established for the heat system using the parameter with higher reliability, the correct solution of equation set is solved by iterative correction idea, and finally the digital twin model is established using the correct solution, to accurately reflect the purpose of complex cogeneration heat system characteristics by digital twin model, representing.The method provided by the application can establish high-fidelity digital twin model.

The application discloses a flow field parameter determination method, device and equipment for full-basin gas flow and a storage medium, relates to the technical field of full-basin axisymmetric flow calculation, and comprises the following steps: establishing and decoupling Boltzmann model equations to obtain each sub-equation, i.e., a nonlinear source term sub-equation, a convection motion sub-equation and an axisymmetric source term sub-equation; analytically solving the nonlinear source term sub-equation to obtain a molecular velocity distribution function value; taking the value as an initial value, solving the convection motion sub-equation by using a finite volume method to obtain a first distribution function value; taking the value as an initial value, solving the axisymmetric source term sub-equation by using the finite volume method to obtain a second distribution function value, integrating the second distribution function value to obtain a current flow field macroscopic parameter, and judging whether convergence is achieved; if convergence is not achieved, the nonlinear source term sub-equation is updated, and the above steps are repeated until convergence is achieved, so that the target flow field macroscopic parameter is obtained, and the efficiency of determining the full-basin axisymmetric flow field parameter is improved.