37 results about "Transient response analysis" patented technology

A computer-executed method for determining the earthquake safety prediction of a super-large project in the field of computer technology, using finite element pre-processing software to establish a finite element model, and inputting the parameters required for the time history of earthquake motion; the parameters are transferred to a supercomputer, and artificial earthquake motion is used to The time-history parallel simulation hybrid task assignment method is used to obtain the seismic excitation dynamic time history; the seismic excitation dynamic time history is returned to the finite element pre-processing software for constraint loading, and the task file of the finite element analysis software is obtained and submitted to the finite element analysis software to obtain The mathematical model, the mathematical model and the time step are transferred to the supercomputer, and the parallel processing method of transient response analysis and modal analysis or the parallel processing method of modal analysis is used for parallel calculation; the data is returned to the finite element analysis software for subsequent calculation; limited The meta-post-processing software reads in the calculation results and performs visual processing. The present invention is realized by means of software, which greatly saves manpower, material resources and financial resources for system implementation.

The invention provides an evaluation method of an auxiliary information delay effect in a GNSS / INS deep combination. The method comprises the following steps: (1) establishing the INS auxiliary tracking loop mathematical model of a Laplace domain according to the principle structure of an INS auxiliary tracking loop, (2) according to the INS auxiliary tracking loop mathematical model, establishing the error transmission model between INS auxiliary delay and a loop tracking error, (3) transmitting the error transmission model into a time domain, using a transient response analysis method to simulate the change of the loop tracking error brought by the INS auxiliary delay of the INS auxiliary tracking loop under a dynamic excitation signal. The method can be used for evaluating the effect of the auxiliary information delay to the INS auxiliary GNSS tracking loop performance, and thus the real-time performance design and tracking loop optimization in GNSS / INS deep combination system development are guided.

This disclosure discloses a fast prediction method for the instability limit of a steam turbine rotor system based on shroud zero damping. By establishing a three-dimensional geometric model of the steam turbine rotor system, the modal analysis module and the transient response analysis module of the finite element software are used to obtain the maximum vibration of the system. The adjacent peak value of the transient displacement response of the blade is read from the displacement response curve (A 1 、A 2 ), calculate the logarithmic damping δ and damping ratio ξ of the rotor system considering the shroud friction under the rotational speed and harmonic excitation loads of each order, and quantitatively calculate the shroud damping C at different speeds s . The present invention uses the FFT multi-harmonic balance method to extend the existing modeling of the surrounding band damping considering the influence of the simple harmonic excitation and the quantitative solution method based on the envelope of the transient response to the multi-frequency excitation. The operation process is clear and the calculation is simple. It has high efficiency, provides theoretical basis and methods for the design and manufacture of steam turbine rotor system, and has important theoretical significance and engineering application value for ensuring the safe operation of steam turbines.

The invention belongs to the technical field of structural dynamics and finite element simulation and particularly relates to a dynamic load nonlinear analysis method for a flexible solar cell wing. The invention discloses the following technologies: 1, a finite element modeling method of tensioning mechanisms, a guide mechanism and hanging steel wire ropes of the flexible cell wing; 2, a method for applying a pre-tightening force of the tensioning mechanisms and the guide mechanism in the nonlinear transient response analysis process; 3, simulation of a mechanical property that the hanging steel wire ropes only can bear a pulling force and cannot be pressed in the NASTRAN solving process; 4, a method for improving nonlinear iteration convergence by compensating difference in lengths of the hanging steel wire ropes, which is caused by deformation of storage boxes; and 5, a nonlinear transient response analysis technology under the combined action of a static pre-tightening force and a dynamic inertial force. The dynamic load nonlinear analysis method for the flexible solar cell wing has the beneficial effects of simple method and ingenious design.