31results about How to "Reduce simulation error" patented technology

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 provides a distribution network reliability evaluation method considering load characteristics and distributed power access, which fully considers different user types and time-series load characteristics in different seasons, so that the evaluation results are more in line with the actual operating conditions of the power grid; At the same time, the island support effect of distributed power access on the distribution network is also considered, so that the scope of application of this evaluation method is wider and it can cope with more diverse power distribution scenarios. The existing distribution network reliability evaluation usually does not consider the timing change of the load, and the peak load is used for simulation, which will inevitably amplify the impact of the fault. However, the present invention considers load characteristics such as load timing characteristics and user types in the reliability evaluation. It can improve the prediction results of the reliability index of the load point and the system, and be closer to the actual value.

The invention discloses a free-form optical reflector for an LED (light-emitting diode) motorcycle low beam, wherein an internal surface of the reflector is a free-form surface to form an optical reflecting surface; the bottom surface of the reflector is provided with an opening for installation of an LED; one end rightly facing the bottom surface is a light exit port of the reflector; the majority of light emitted by the LED light source is reflected by the internal surface of the reflector and then is emergent to an illuminating plane, and the other light is directly emergent to the illuminating plane. The reflector is divided into an upper part and a lower part; the free-form surface at the upper part of the internal surface of the reflector is mainly used for reflecting the light above a horizontal plane to the illuminating plane below the horizontal plane; the free-form surface at the lower part of the internal surface of the reflector is mainly used for gathering diffused light below the horizontal plane to the illuminating plane below the horizontal plane. The free-form optical reflector for the LED motorcycle low beam has the characteristics of simple structure, convenience in installation and high utilization rate of light energy; light direction can be effectively controlled and the glare effect can be inhibited; and the free-form optical reflector for the LED motorcycle low beam meets the light distribution requirements in GB5948-1998.

The invention provides a method for simulating the cycloidal tooth profile curve of a reducer, which includes obtaining the relevant motion data of the cycloidal gear teeth of the reducer, and drawing the actual curve of the cycloidal tooth profile motion; according to the geometric structure of the reducer, the The theoretical equation of the linear tooth profile curve and its specification parameters, as well as the calculation formula for determining the correction parameters and simulation parameters; determine the current correction parameter value, and after extracting the value of the specification parameter from the relevant motion data, calculate the specific value of the simulation parameter , to further simulate the theoretical curve of the cycloidal gear profile movement; compare the actual curve and the theoretical curve to see if there is a distance difference greater than the preset threshold; if yes, modify the current correction parameter value and continue the simulation; otherwise, output the final simulation theoretical curve. By implementing the present invention, combining the reality and theory of the cycloid gear teeth of the reducer, a plurality of characteristic parameters are formed for simulation to reduce the simulation error and improve the reliability, accuracy and high efficiency of the data.

The embodiment of the invention provides a remote sensing imaging simulation method and a device, which relate to the technical field of computer simulation and are used for simulating the imaging result of a satellite optical sensor. The method includes: acquiring a first image; Determining a downsampling region in the first image according to downsampling parameters and imaging mode parameters of the optical sensor; Performing down-sampling processing on pixels in the down-sampling area to obtain a second image; The second image is adjusted according to the imaging mode parameters to obtaina remote sensing imaging simulation image based on the imaging mode parameters. The method can simplify the simulation process of satellite remote sensing imaging and reduce the cost and difficulty ofsatellite remote sensing imaging simulation.

The invention discloses a power system network simplifying method capable of avoiding negative resistance. The power system network simplifying method includes: S10, eliminating N to-be-eliminated nodes, merging constant impedance load values of the N to-be-eliminated nodes, and performing transfer processing, wherein a to-be-processed power system network comprises at least one to-be-eliminated node and N is a positive integer; S20, simplifying the to-be-processed power system network which does not contain constant impedance load to obtain a standard-form power system network; S30, performing load flow calculation and transient stability calculation on the to-be-processed power system network and the standard-form power system network respectively; S40, comparing load flow results and transient curves of the two networks; if load flow error or transient error is less than a set threshold value, completing network simplifying; if not, changing a merging scheme, namely repeating the S10 after the to-be-eliminated nodes are arranged and combined. A CSR network simplifying method and a load transfer idea are applied, so that efficient and practical network simplifying is realized and negative resistance can be avoided effectively.

The invention relates to a method for improving full-dynamic ground simulation authenticity in inertial navigation. The method for improving the full-dynamic ground simulation authenticity in the inertial navigation comprises the steps of sampling an original property signal of a sensor of an inertial navigation accelerometer, and generating a digital signal comprising an original acceleration signal of the accelerometer and a position signal characteristic; and converting the digital signal into an analogue signal through a hardware control card, and sending the control analogue signal to an inertial navigation system in a pulse manner. When a missile is launched, a sent escape signal is manually controlled through hardware collection. A fixed time interval is set by the signal according to a working state of actual inertial navigation; and an order of converting inertial navigation into navigation is sent to the inertial navigation at certain time interval. With the adoption of the method provided by the invention, the inertial navigation system is more similar to an actual flight working state, so that the confidence of a semi-physical simulation test of a missile guidance system can be improved.

The invention discloses an electromagnetic and electromechanical transient mixed simulation electromagnetic side system equivalent method, which belongs to the technical field of power system simulation. The method is suitable for commercial electromagnetic transient simulation platforms; it includes the steps of: extracting the positive-sequence phasor of voltage fundamental wave and the positive-sequence phasor of fundamental wave of current at each interface bus; calculating the active power P and Reactive power Q; transfer P, Q, interface positive sequence voltage amplitude U, and phase angle difference between each interface voltage as the equivalent information at interface k to the electromechanical transient simulation platform; construct the corresponding iterative coefficient matrix, and use Iterative calculation of node voltage for electromechanical transient simulation. This method can effectively reduce the simulation error brought by the equivalent model of the electromagnetic side to the electromechanical transient simulation, especially to significantly improve the accuracy of the electromechanical transient simulation of the electromechanical side system during a fault.

The invention provides a motion control simulation method of variable rotation center of a dynamically positioned ship, which calculates the speed of the center of rotation of the ship and the switching matrix of the center speed of the ship through the position of the center of rotation in the coordinate system of the ship, and calculates the motion state of the center of rotation. Calculate the expected motion state, calculate the relative position coordinates of each propeller, calculate the new propeller position layout matrix, calculate the expected thrust and expected rotation azimuth of each propeller, and synthesize the thrust actually output by the propeller to the center of rotation , form a resultant force, calculate the motion state at the center of rotation, calculate the position and attitude in the northeast coordinate system, and calculate the position of the center of rotation. The invention can effectively simulate tasks such as fixed-point positioning and path tracking after the dynamic positioning ship changes the rotation center, reduces the simulation error, can truly reflect the actual situation, and can provide motion control for the actual dynamic positioning system variable rotation center provide technical support.

The invention provides a simulation model for realizing radio frequency identification and a simulation method of the simulation model. The simulation model comprises a signal source model, a card reader model and a tag model, wherein the signal source model is used for outputting a synthetic signal, the synthetic signal is synthesized from carrier waves and signal waves; the card reader model is used for inputting the synthetic signal and outputting a first electromagnetic signal to the tag model; and the tag model is used for receiving the first electromagnetic signal and outputting a second electromagnetic signal to the card reader model. The signal source is approximate to a true signal source, and simulation errors can be reduced. Therefore, through the simulation model, simulation errors can be reduced, and the precision of a simulation result is improved.

The invention discloses an all-condition simulation modeling method and system for a radial turbine based on particle swarm optimization for compressed-air energy storage. The method comprises the steps of: determining an input quantity, an output quantity and model parameters of a dynamic radial turbine simulation model; establishing a radial turbine simulation model for calculating the frictionloss and incidence loss of the radial turbine, and optimizing the process of solving the radial turbine simulation model; solving the optimization problem using the particle swarm optimization to obtain the output quantity of the radial turbine simulation model; reducing the simulation error caused by falling into local optimal value by using a loop iterative processing method; and building an all-condition simulation module of the radial turbine based on the particle swarm optimization on a Matlab / Simulink platform, wherein the module can be freely combined with other models in the Matlab / Simulink. The simulation model obtained can effectively show the running condition of the radial turbine under all conditions, and has a low simulation error.

The invention discloses a real-time control system and real-time control method for a depth simulator. A hydraulic pump station provides an oil source so that a pressure cavity generates corresponding pressure; one path of the pressure is applied onto a user sensor, and the other path is applied onto a double-range pressure sensor; a feedback voltage signal of the double-range pressure sensor acquired by PCI-1716 is transmitted to an industrial control computer and is converted into a pressure intensity signal serving as a system feedback value; the industrial control computer receives a digital depth signal transmitted by an emulation host into a pressure intensity signal serving as a reference input value of a depth simulator system, calculates an error amount and performs PID operationand converts the calculated value amount representing the depth into a voltage signal; and the open size and in / out oil of an electro-hydraulic servo valve are controlled by a PCI-1723 data output card so that a working cavity generates corresponding pressure. The invention ensures low delay and high real-time performance, reduces the emulation error and improves the control precision.