64results about How to "Enable accurate simulation" patented technology

The invention provides a transient temperature prediction method for an aviation permanent-magnet synchronous motor. According to the method, a two-dimensional electromagnetic field is designed for the motor and corresponding electromagnetic parameters are obtained according to the geometric size, material parameters, work system and load characteristic of the motor, a Matlab / Simulink electric driving system is used for simulation analysis, a three-phase current and motor rotating speed curve of the motor is obtained, high-precision temperature distribution is obtained by loss calculation based on curve fitting and a current / voltage source method, 3D motor model design and finite element model grid generation, cooling / radiating condition and liquid-solid coupling analysis, and transient temperature prediction for different components of the motor, and optimized design of the motor is facilitated to largest extent.

The invention relates to a data processing system for constructing a digital value fusion device based on a super computer, which comprises a cloud computing platform and the super computer, the cloud computing platform is in communication connection with the super computer, and the super computer comprises an artificial intelligence model library, a processor and a memory in which a computer program is stored. A pre-trained auto-encoder model is stored in the artificial intelligence model library. According to the system, the digital value fusion device can be quickly and accurately constructed, and full-period simulation of equipment is realized.

The invention discloses a solar wing flexible simulator. The solar wing flexible simulator comprises a base, a first simulating part, a second simulating part, a third simulating part and a torque sensor, wherein the first simulating part, the second simulating part and the third simulating part are sequentially connected and are installed on an air floating platform through the base connected with the first simulating part; the first simulating part is used for simulating the rotating inertia and the frequency of the first-order mode of a solar wing; the second simulating part is used for simulating the rotating inertia and the frequency of the sixth-order mode of the solar wing; the third simulating part is used for simulating the rotating inertia and the frequency of the twelfth-order mode of the solar wing; and the torque sensor is arranged at the position, close to the air floating platform, of the simulator and is used for measuring the torque output by the simulator to the air floating platform. The solar wing flexible simulator can analyze influences of different rotating inertias and different mode frequencies on a spacecraft body structure, and on the basis, the solar wing structure can be subjected to optimized design.

The invention discloses an anti-vibration shaft well test apparatus and a reconstruction method thereof. The apparatus comprises a shaft well, an excitation system and a control system, wherein the excitation system comprises six horizontal vibration exciters and one vertical vibration exciter, the horizontal vibration exciters and the vertical vibration exciter are arranged in the shaft well, andthe control system controls the horizontal vibration exciters and the vertical vibration exciter to carry out anti-vibration test on a test device in the shaft well, so the test ability of the anti-vibration shaft well test apparatus is improved.

The invention discloses a small experiment chamber capable of simulating a complex environment. The small experiment chamber comprises a horizontal cylindrical chamber body and is characterized in that a cylinder part of the chamber body is transparent; one end of the chamber body is sealed by using a metal material and provided with an air inlet, an extraction opening and a data line joint, wherein the air inlet and the extraction opening are communicated with the inside and the outside of the chamber body; the other end of the chamber body is provided with a metal chamber door capable of being opened and closed; each of the metal chamber door and the metal sealed end of the chamber body is provided with a heating and cooling device; the outer wall of the cylinder of the chamber body is provided with a magnetic field generating device; the air inlet is connected with an air input device and an ultrasonic atomizer; the extraction opening is connected with a vacuumizing device; the chamber body is internally provided with a magnetic field sensor for acquiring a magnetic field signal, a pressure sensor for acquiring a pressure signal, a temperature sensor for acquiring a temperature signal and a humidity sensor for acquiring a humidity signal; and all the signals are processed by a microcomputer through the data line joint, and an instrument is given, so that the simulation control for the complex environment inside the chamber body is realized through the magnetic field generating device, the air input device, the acuumizing device, the heating and cooling device and the ultrasonic atomizer.

The invention relates to a hydroelectric generating set speed regulation control simulation method and system. The system includes a RTDS real-time simulation apparatus, a frequency-testing unit, a water turbine governor, a water diversion system and a water turbine simulation apparatus. A water diversion pipeline water hammer effect model is established to simulate water diversion pipeline water hammer effects, an actual water turbine governor is subject to parameter and structure identification so as to establish a water turbine governor RTDS model which accords to actual operation mode and control mode. The simulation level of the governor is increased due to the RTDS model. Precise simulation of the characteristics of frequencies of the hydroelectric generating set is realized, and simulation precision is increased.

The invention provides an excitation inrush current simulation method and device for an ultra-high voltage transformer under a condition of no-load closing. The excitation inrush current simulation method comprises the following steps: on the basis of the transitional area between the linear area and the non-linear area of the non-hysteresis curve, non-hysteresis magnetization intensity indicated by Langvin function is corrected; the corrected non-hysteresis magnetization intensity is utilized to establish a J-A magnetic hysteresis model; the parameters of the J-A magnetic hysteresis model are recognized; an analysis is conducted on the ultra-high voltage transformer and the differential magnetic susceptibility equation is determined; through the J-A magnetic hysteresis model and the differential magnetic susceptibility equation, the excitation inrush current of the ultra-high voltage transformer under the empty charging condition is determined. The excitation inrush current simulation method and device for the ultra-high voltage transformer under the condition of non-load losing correct the non-hysteresis magnetization intensity, enable the transitional area between the linear area and saturation area of the non-hysteresis curve to be closer to a true value and accurately simulate the magnetization characteristics of the transformer; moreover, the special construction of the ultra-high voltage transformer is considered and the excitation inrush current of the ultra-high voltage transformer under the condition of empty charging is simulated. Errors in the simulation are reduced.

The invention discloses an evaluation method based on the influence of the shared memory accompanying the program group on the program execution time. Based on the given program to be tested, the program execution mode and the characteristics of the hardware platform, the impact of the shared memory on the program in the multi-core embedded system is evaluated. The impact of time, the steps are as follows: S1, build a simulation platform based on the given execution mode and hardware platform characteristics, S2, execute the program to be tested and the designed accompanying program group under the given execution mode, and obtain the execution time data, S3. Using the curve fitting method to obtain the fitting curve of the data, and through the test of the entire accompanying program group, sum up the influence of different accompanying programs on the execution time of the test program. This evaluation method achieves accurate simulation of actual application scenarios through the construction of the experimental platform and the setting of the program execution mode. On the simulation platform, the method uses a set of companion programs that cover a wide range of memory access patterns and are able to cover most real-world implementations.

The invention discloses a motion target curve control PVT data construction method. The method comprises the following steps: sampling target motion data; obtaining a target motion curve position-time point numerical discrete description needing to be simulated; setting a motion starting and ending position guide section; performing spline interpolation, calculating to obtain a matched position-speed data point pair array, and forming PVT data for motion control by combining a corresponding moment distribution array; reconstructing a complex curvilinear motion trajectory, and controlling the target to move according to the planned trajectory. According to the method, the real-time position tracking precision is greatly improved, and accurate simulation of any form of motion curve can be realized; it is ensured that the simulation motion device smoothly transits from a static state to a target motion state; meanwhile, kinematics parameter information of a motion curve is increased, and the stability of target motion tracking is improved.

The invention discloses an MMC flexible direct-current system. The MMC flexible direct-current system comprises a first converter station and a second converter station, wherein the first converter station and the second converter station are connected through a direct-current circuit and each comprise an alternating-current system, a main circuit breaker, a transformer and multiple bridge arms, each alternating-current system, the corresponding main circuit breaker and the corresponding transformer are sequentially connected in series, every two corresponding bridge arms are connected in series to form a phase of bridge arms, the number of the phases of the bridge arms is three, and the phases of bridge arms are connected in parallel and then are connected with the transformers in series; each bridge arm comprises a bridge arm reactor and a valve bank which are connected in series, each valve bank comprises multiple sub-modules, in the open circuit state, the sub-modules are equivalent to a series circuit of a resistor and a capacitor, and in the short circuit state, the sub-modules are equivalent to an inductive circuit. During real-time digital simulation, inversion does not need to be conducted on an admittance matrix again, in this way, a large amount of calculation time can be saved, the real-time simulation step size is reduced to smaller than several microseconds according to requirements, and accurate simulation of the MMC flexible direct-current system is achieved.