37results about How to "Convenient simulation analysis" patented technology

The invention discloses an emulational USB intermediate frequency responser used for satellite test and control. The emulational USB intermediate frequency responser used for the satellite test and control consists of a front-end analog-to-digital converter, a digital down-conversion module, a carrier synchronization module, a demodulation filter module, a forwarding modulation module and an output analog-to-digital converter; the connecting relations and the signal flow paths are that: an output signal of the front-end analog-to-digital converter enters the digital down-conversion module for processing; the output of the digital down-conversion module is processed in the carrier synchronization module; an output signal of the carrier synchronization module enters the demodulation filter module for processing; one output signal obtained by the demodulation filter module is remote subcarrier output of a demodulator; the other signal is a ranging signal; the ranging signal enters the forwarding modulation module for processing; and the output signal of the forwarding modulation module enters a digital-to-analog converter; and the output of the digital-to-analog converter is an intermediate frequency output signal of the responser. The emulational USB intermediate frequency responser has high stability, low design complexity, high compatibility, a practical value and an application prospect.

The invention discloses a 3D pavement generation method applicable to a virtual prototype system. The method comprises the following steps: the first step, establishing a 3D random pavement elevation model of a fast Fourier transform (FFT) algorithm based on a single-point FFT pavement roughness random excitation time domain model; the second step, programming a general program of the FFT 3D pavement model in MATLAB software, and selecting the pavement of a specific level to simulate the pavement roughness according to needs, thus obtaining coordinate data of the 3D pavement; the third step, establishing a generalized pavement file which is applicable to common multibody dynamics software: establishing a general model which generates the 3D pavement file and comprises the node generation and the unit generation algorithm, thus compiling the coordinate data of the 3D pavement obtained in the second step into a pavement file that can be identified by virtual prototype simulation software; and the fourth step, performing virtual prototype modeling simulation. The method has faster computation speed of the 3D FFT model, and is more suitable to the research requirements of multi-dimensional complicated systems, real-time systems and the like.

The invention discloses a troposphere intermittent gliding flight control method and belongs to the flight control technical field. The troposphere intermittent gliding flight control method is particularly applied to an aircraft to increase flight time or range of the aircraft by reasonably using updrafts in a troposphere region. The method includes the following steps that: step one, heat updraft modeling and judgment are carried out; step two, aircraft modeling is carried out, and a control law when updrafts do not exist is designed; and step three, intermittent gliding flight control is carried out. According to the control method of the invention, atmospheric energy is utilized to perform intermittent gliding flight, and therefore, the flight time and range of the aircraft can be improved, and the control method has important significance for the aircraft to realize long-flight time, long-range and attack patrol operational goals. The control method of the invention can be widely applied to small-sized unmanned aerial vehicles and small-sized cruise missiles, and can effectively improve the combat effectiveness of the unmanned aerial vehicles and cruise missiles.

The invention relates to an automatic control principle experiment platform, and belongs to the technical field of experiment and testing technology experiment equipment. The automatic control principle experiment platform includes a rotary table body, a rotary encoder, a direct current moment motor, a load apparatus, a mechanical bearing and an embedded controller, wherein the rotary encoder, the direct current moment motor and the embedded controller are arranged in the vertical type rotary table body; the direct current moment motor is connected with the load apparatus at the top of the rotary table body through the mechanical bearing; the rotary table body is arranged below the direct current moment motor, and is connected with the direct current moment motor coaxially; and the embedded controller is arranged below the rotary encoder. The automatic control principle experiment platform integrates a servo rotary table system with an automatic control principle experiment so as to improve the engineering practicalness of experiment and enrich the experiment content.

The invention discloses a bundled wire and a three-dimensional design model construction method thereof. The bundled wire comprises a plurality of bundled wire cores, a coating is arranged outside thebundled wire, the bundled wire is provided with multiple stages of wire harness branches, and the bifurcation point of the central axis of each branch is also provided with an inflection part. The construction method comprises the following steps: selecting a construction form of a multi-core wire model, and constructing an initial model of the multi-core bundled wire; solving the diameter information and the physical attribute information of each branch wire harness according to the manufacturing process parameters of the bundled wire, and constructing a space curve model of the central axisof the bundled wire; and constructing an energy function model of the bundled wire based on the information, solving a space curve initial model function of the central axis of the bundled wire, andconstructing a three-dimensional design model of the bundled wire in three-dimensional space software based on the diameter information of the bundled wire. The objective of the invention is to solvethe problems of low trueness and poor design quality of a wire harness three-dimensional design model due to the fact that a wire harness manufacturing process and actual physical attributes of a wireharness are not considered in a traditional scheme.

The invention discloses a model for modeling a large steam turbine generator with a function of static excitation. The model comprises a static excitation subsystem model, an excitation winding subsystem model and a rotor shafting subsystem model; the static excitation subsystem model implemented by a modeling method considers ground capacitance of a neutral point; the excitation winding subsystem model considers the influence of input-output upon an end and excitation winding loss related to frequency; the rotor shaft system subsystem model considers ground capacitance of a rotor shaft and shafting impedance of a steam turbine. The output end of the static excitation subsystem model is connected to the input end of the excitation winding subsystem model. The output end of the static excitation subsystem model is connected to the input end of the excitation winding subsystem model. The output end of the excitation winding subsystem model is connected to the input end of the rotor shafting subsystem model. The static excitation subsystem model of the generator is established, the excitation winding subsystem model and the rotor shafting subsystem model are established, shaft voltage waveform produced by a static excitation system can be acquired for the generator in a simulation manner, and simulation analysis and research for control of shaft voltage is facilitated. The model has the advantages of simple structure, easiness in implementation and high precision.

Disclosed is an all-digital short wave exciter for voice signal modulation. The all-digital short wave exciter for voice signal modulation comprises a front-end analog-digital conversion A / D module, a digital signal processing unit, a digital up-conversion module and a hardware module. The output of the front-end analog-digital conversion A / D module is connected to the digital signal processing unit, and the output of the digital signal processing unit is connected to the digital up-conversion module. Firstly, an input signal enters the front-end analog-digital conversion A / D module, the signal which is sampled by the front-end analog-digital conversion A / D module enters the digital signal processing unit to be preprocessed, the signal which is processed by the digital signal processing unit enters the digital up-conversion module to be processed in an up-conversion mode, the output signal which is processed by the digital up-conversion module enters the hardware module to be processed through filtering and amplification, and the output signal processed by the hardware module serves as the output of the all-digital short wave exciter. The digital signal processing unit is implemented in an FPGA, and the digital up-conversion module is implemented through part of functions of AD9788.

The invention discloses an emulational USB intermediate frequency responser used for satellite test and control. The emulational USB intermediate frequency responser used for the satellite test and control consists of a front-end analog-to-digital converter, a digital down-conversion module, a carrier synchronization module, a demodulation filter module, a forwarding modulation module and an output analog-to-digital converter; the connecting relations and the signal flow paths are that: an output signal of the front-end analog-to-digital converter enters the digital down-conversion module for processing; the output of the digital down-conversion module is processed in the carrier synchronization module; an output signal of the carrier synchronization module enters the demodulation filter module for processing; one output signal obtained by the demodulation filter module is remote subcarrier output of a demodulator; the other signal is a ranging signal; the ranging signal enters the forwarding modulation module for processing; and the output signal of the forwarding modulation module enters a digital-to-analog converter; and the output of the digital-to-analog converter is an intermediate frequency output signal of the responser. The emulational USB intermediate frequency responser has high stability, low design complexity, high compatibility, a practical value and an application prospect.

The invention relates to a common method for three-dimensional simulation of a sundial. The method comprises the following steps that S10, the three-dimensional models of the surface and the pointer of the sundial are built; S11, the three-dimensional model of the sundial is built; S12, the solar altitude and the solar azimuth of a site at different moments are calculated; S13, the positions of the shadows of the pointer formed on the face at all the moments from sunrise to sunset are calculated, and the positions of all moment lines are obtained; S14, the motion track of a sundial shadow in any time frame from the sunrise to the sunset is dynamically simulated, and the simulation data from the sunrise to the sunset in one day or a year are output. The designed sundial is visually shown in a three-dimensional mode, the positions of the moment lines are visually simulated and analyzed, a visual and convenient simulation analysis and auxiliary demonstration tool is provided for sundial individualized design, city landscaping planning, science teaching and research and science popularization education, and the effect of sundial design and building is improved.

The invention provides a three-roller edge rolling shaping numerical modeling simulation study method. The study method includes steps of confirming geological dimension of a model roller and a belt steel according to the technical parameter of a plate bender; according to the stress condition in the shaping process, reducing the calculation time while selecting a two-dimensional plane model to model; selecting three shaping rollers as analysis rigid bodies, confirming analysis step and boundary condition; when every surface of the shaping roller, the steel plate and the pressing plate is defined and contacted, setting the requirement about main and slave contact faces in the process of releasing according to ABAQUS, setting the rigid surface as a main face and upper and lower surfaces ofthe steel plate as slave faces; setting the contact face between the pressing plate and the steel plate as the main face, upper and lower surfaces of the steel plate as the slave face; selecting the unit type and classifying the network; acquiring a simulation result and analyzing it. Every numerical value is simulated and analyzed when the panel is rolled to be circle, the circle rolling work canbe studied conveniently; the technical improvement can be carried out exactly and precisely in further study.

The invention discloses a laser diode simulation circuit, which belongs to the technical field of electronic circuit. The laser diode simulation circuit comprises a threshold setting circuit, a voltage subtractor circuit and a voltage conversion circuit, wherein the threshold setting circuit is used for setting the threshold of the laser diode; the voltage subtractor circuit is used for subtracting the input voltage of the laser diode from a threshold; and the voltage conversion circuit converts the voltage obtained by subtraction into a constant current output in proportion to the voltage.

The invention relates to a flight scheduling method and system based on a cellular automaton and a storage medium, and the method comprises the steps: obtaining a constraint condition set of all channels, and constructing a cellular automaton model according to the constraint condition set; obtaining an initial arrival and departure data set of all flights according to a preset scheduling plan, and obtaining an initial flight scheduling plan according to the initial arrival and departure data set and the cellular automaton model; and obtaining real-time arrival and departure data sets of all flights in real time, and obtaining an optimized flight scheduling plan according to the initial flight scheduling plan, the real-time arrival and departure data sets and the cellular automaton model. According to the method and system, secondary optimization of flight scheduling is realized, the data of the flight in the real-time process of entering and leaving is fully considered for subsequent scheduling plan adjustment, the error accumulation phenomenon caused by manual driving, model errors and the like is avoided, the deviation between the actual entering and leaving process and the scheduling plan which is gradually expanded is effectively reduced, and the scheduling optimization effect is effectively improved.

The invention relates to a fast solving method for the optimal operation point of a permanent magnet motor, which belongs to the technical field of permanent magnet motors. Through carrying out electromagnetic simulation analysis on the permanent magnet synchronous motor, a certain number of optimal operation points under different rotation speeds are acquired; the torque of each optimal operationpoint of the motor under each rotation speed and current amplitude are subjected to primary fitting, the torque and a current initial phase angle are subjected to cubic fitting, and coefficients of each fitting function are recorded; data corresponding to an existing specific rotation speed are called, the fitting function is inversely solved, and any optimal operation point under the rotation speed can be acquired; when the torque and the current initial phase angle can not be fit under partial rotation speeds, a stepping method is used to search for the optimal operation point; as for rotation speeds which does not generate data, adjacent rotation speed data are used for interpolation solution; and the motor efficiency under a certain number of optimal operation points is calculated toobtain a permanent magnet motor efficiency cloud map. Each optimal operation point of the motor can be quickly searched, subsequent operation is assisted to determine the loss, the efficiency featuresand the like during the whole operation range of the motor, and a basis is provided for design of a controller corresponding to the motor.

The invention relates to a variable-rigidity electromagnetic particle damper. The variable-rigidity electromagnetic particle damper comprises a fixed box (1), a particle box slidably connected in thefixed box (1) and particles (6) installed in the particle box. The particle box comprises an inner box (11) and an outer box (3). An outer surface of the outer box (3) is winded by a coil (4). The particles (6) adopt an easily-magnetized and easily-demagnetized soft magnetic material. An outer side face of the outer box (3) is connected with an inner surface of the fixed box (1) through a spring (2). Compared with the prior art, the variable-rigidity electromagnetic particle damper is capable of, while a vibrating level is overlarge, applying an electric current through the coil orthogonally arranged on the upper face of the inner box, generating a magnetic field, enabling a direction of the magnetic field to be opposite to a direction of a maximum acceleration of the outer box, and through magnetizing the particles, enabling the particles to be moved towards a certain direction as a whole, thereby realizing maximum damping efficacy.

The invention relates to the technical field of flexible direct current, in particular to an MMC general simulation model suitable for AC / DC fault ride-through research. An MMC general bridge arm model and a bridge arm average value model (UAAM) which do not contain additional switches and diodes are provided aiming at the rapid electromagnetic transient simulation problem of MMC.The model assumes that the capacitor voltage in the bridge arm is well balanced, and the bridge arm circuit is equivalent to a series circuit of a controlled voltage source and a controlled resistor. A universal bridge arm average value model (UAAM) after averaging and equivalence of a simulation model fully considers the follow current characteristic of a diode, and a controlled voltage source and a controlled resistor are calculated according to the on / off state of the diode, so that the locking behavior characteristic of the bridge arm can be accurately reflected under the condition of not additionally adding a switch and the diode, the number of circuit nodes is reduced, and the simulation efficiency is improved.

The present invention discloses a high-voltage direct current system rapid bypass series compensation device control method. The method comprises the steps of: an input end of a serial compensation device is connected with an output end of a direct current transmission device, an output end of the serial compensation device is connected with an input end of a switching device, the input end of theserial compensation device is connected with an output end of the switching device, a serial compensation end of the serial compensation device is connected with a serial compensation access end of the direct current transmission device, the serial compensation device comprises a serial compensation switching module and a capacitive module, the serial compensation end of the serial compensation device is connected with a serial compensation end of the capacitive module, and the input end of the serial compensation device is connected with the input end of the serial compensation switching module; and the output end of the serial compensation switching module is connected with the input end of the capacitive module. A master control device is configured to achieve the following rapid bypass serial compensation steps: obtaining the actual operation power of the direct current transmission device; and when it is detected that the actual operation power is smaller than a preset value andduration time T exceeds preset time T1, outputting a disconnection instruction to allow the serial compensation switching module to be disconnected. The high-voltage direct current system rapid bypassseries compensation device control method solves the resonance harmonic wave problem between the alternating current and direct current systems comprising serial compensators.

The invention discloses a high-speed train transmission gear box body strength test method. The method comprises the following steps of S1, carrying out gear box load test detection, namely installinga ferrule on an outer ring of a bearing in a gear box body, adhering a strain sensor and an acceleration sensor, and recording the detection data through gear box operation, and obtaining the dynamicload data of a gear box speed reducer and a gear. According to the invention, the ferrule is installed on the bearing outer ring in the gearbox body, the strain sensor and the acceleration sensor arebonded, a speed measurement sensor is installed or a vibration acceleration sensor is used in the gearbox body, a load test is started, and operation data is obtained according to the strain sensor and the acceleration sensor. Data facilitates the fatigue simulation analysis of the gear box, then sealing detection, corrosion detection and tensile strength detection are conducted, ultrasonic wavesin an ultrasonic flaw detector penetrate into the welding position or the metal material of the box body, and whether the material and the welding position of the box body have defects or not is detected.

A combustion device and a measurement system for realizing multi-point spontaneous combustion in space, wherein the combustion device for realizing multi-point auto-ignition in space comprises: a combustion chamber, and a combustion channel is arranged inside the combustion chamber; a baffle plate, the baffle plate along the combustion channel A plurality of inner cavities are arranged at intervals in the extending direction; wherein, the inner cavities are communicated with the combustion passage, so as to obtain a plurality of restricted spaces in the combustion passage. The invention designs a plurality of internal cavities composed of baffles as a limited space, which can quickly realize the simultaneous formation of multiple hot spots of the flame and the process of deflagration to detonation, which is beneficial to simulate and analyze the limited space of large gas turbines and aero-engines For the flame acceleration and detonation process, it provides theoretical support for the combustion process analysis and structural optimization design of the combustion power plant.

An aerosol detection device based on spark-induced breakdown spectroscopy and Raman spectroscopy, a reaction chamber is opened in the inner center of the housing; vertical through holes A and vertical mounting holes are opened on the upper, lower and front parts of the housing A and a rotating through hole, and an oblique through hole is opened on the front side of the vertical mounting hole A; a probe mounting hole is opened on the left part of the housing; an optical window is opened on the right part of the housing; the vertical through hole A An aerosol inlet pipeline is installed at the upper end of the vertical through hole A, and the inner diameter of the lower end of the vertical through hole A gradually shrinks downward to form a shrinking nozzle; an aerosol discharge pipeline is installed at the lower end of the oblique through hole; Composed of a rotating shaft, a high-voltage electrode, a high-voltage pulse generator and a lens; the inner end of the rotating shaft is a flat structure, and is rotatably installed in the rotating through hole; the high-voltage electrode is installed in the vertical mounting hole A; the lens is installed in the In the optical window; the Raman probe is installed in the probe mounting hole. The device can detect aerosol samples in real time.

The invention relates to an ultra-low bit rate PSK demodulator for satellite communication system, which consists of a front end A / D conversion module, a digital down converter module, a carrier wave synchronous module and a bit synchronization module; wherein the front end A / D conversion module is made of ready-made product, and the digital down converter module, the carrier wave synchronous module and the bit synchronization module are realized in an FPGA; the connection relationship is that an output of the front end A / D conversion module is connected with the digital down converter module, an output of the digital down converter module is connected with the carrier wave synchronous module, and an output of the carrier wave synchronous module is connected with the bit synchronization module; the moving direction is that an input signal is regulated and then enters into the front end A / D conversion module; after sampling by the front end A / D conversion module, the signal enters intothe digital down converter module to be treated; after that, the signal enters into the carrier wave synchronous module for carrier wave synchronous treatment; then, the signal enters into the bit synchronization module for bit synchronization treatment; finally, the output signal is the output of the demodulator. Therefore, the ultra-low bit rate PSK demodulator has practical value and application prospect.

The invention relates to a combustion device for realizing space multipoint spontaneous combustion and a measurement system. The combustion device for realizing space multipoint spontaneous combustioncomprises a combustion chamber and baffles, wherein a combustion channel is arranged in the combustion chamber; and a plurality of inner cavities are arranged at intervals in the extending directionof the combustion channel by the baffles, and the internal cavity is communicated with the combustion channel and is used for obtaining a plurality of limited spaces in the combustion channel. A plurality of internal cavities composed of baffles are designed as limited spaces, the device can quickly achieve the simultaneous formation of a plurality of hot spots of flame and the process of converting combustion into detonation, facilitates the simulation and analysis of the flame acceleration and detonation process in the limited space of a large gas turbine and an aero-engine, and provides theoretical support for the combustion process analysis and structural optimization design of a combustion power device.

The invention discloses a laser diode simulation circuit, which belongs to the technical field of electronic circuit. The laser diode simulation circuit comprises a threshold setting circuit, a voltage subtractor circuit and a voltage conversion circuit, wherein the threshold setting circuit is used for setting the threshold of the laser diode; the voltage subtractor circuit is used for subtracting the input voltage of the laser diode from a threshold; and the voltage conversion circuit converts the voltage obtained by subtraction into a constant current output in proportion to the voltage.

The invention provides a simulation visualization device for an internal flow field of a celadon kiln. A simulation visualization device for an internal flow field of a celadon kiln comprises a scale model main body which comprises a model shell and a bottom plate; the flue gas simulation assembly comprises a fan used for generating air flow, a tracer particle generator used for generating tracer particles, and an air flow pipeline used for conveying and mixing the air flow and the tracer particles to form simulated flue gas; the laser tracing assembly comprises a laser generator used for generating laser and a prism used for at least partially changing a laser light path. According to the invention, the scaled model main body is used to simulate the celadon kiln prototype with a high simulation degree, and the flow track of the simulated smoke in the scaled model main body is visually displayed through laser irradiation by using the difference between the reflectivity of the tracer particles and the reflectivity of air to the laser. Therefore, the actual kiln flow field of the celadon kiln prototype can be conveniently simulated and analyzed.

The invention relates to the technical field of modeling packaging, and provides a photoelectric heterogeneous and heterogeneous integrated process parameterized basic unit model construction method, which comprises the following steps of: respectively establishing a parameterized matrix model of each photoelectric heterogeneous and heterogeneous integrated basic unit, the photoelectric heterogeneous integrated basic unit comprises an electric driving chip, an optical active device, an optical passive device and a photoelectric heterogeneous passive interconnection structure; according to the design requirements of the photoelectric heterogeneous integrated system, calling each parameterized matrix model, carrying out environmental parameter calculation and analysis, and building a simulation link of the photoelectric heterogeneous integrated system to obtain the photoelectric heterogeneous integrated system. According to the method, the effectiveness and parameterization of different professional models are guaranteed, meanwhile, environmental factors are considered, system optimization simulation analysis based on the models is achieved, and the photoelectric heterogeneous integration design capacity and design efficiency are improved.

The invention relates to a cellular automata-based flight scheduling method, system and storage medium. The method includes acquiring constraint condition sets of all channels, constructing a cellular automata model according to the constraint condition sets; The initial arrival and departure data set of the flight, the initial flight scheduling plan is obtained according to the initial arrival and departure data set and the cellular automata model; the real-time arrival and departure data sets of all flights are acquired in real time, and the initial flight scheduling is obtained according to the initial flight scheduling. The plan, the real-time arrival and departure dataset, and the cellular automata model, result in an optimized flight scheduling plan. The invention realizes the secondary optimization of flight scheduling, fully considers the data in the real-time process of arrival and departure of the flight to adjust the subsequent scheduling plan, avoids the accumulation of errors caused by human driving and model errors, and effectively reduces the The deviation between the actual entry and exit process and the scheduling plan gradually expands, which effectively improves the scheduling optimization effect.

The invention relates to the technical field of information management, and discloses an industrial information security semi-physical simulation platform, which comprises a central control module, an information acquisition module, an information processing module, an information conversion module and a motion control module. The industrial information security semi-physical simulation platform has the advantages that the central control module comprises a safety protection module, a graph drawing module, a data processing module and a model building module, during use, simple motion simulation can be performed according to related data collected by the information collection module, the safety protection module is used for protection to prevent data leakage, each of the information processing module and the information conversion module comprises a data integration module, a data conversion module and a data transmission module, the received data can be sorted, repeated data can be eliminated and converted into corresponding electric signals and the like, the data transmission module and the central control module carry out information interaction, all motions do not interfere with each other, and all the parts can move smoothly, so that the requirements of actual use are met.

The invention provides a method for determining the length of the peripheral flow field in the simulation analysis of the micro-topographic wind field, wherein the method includes the following steps: determining the shape of each peak in the continuous peaks; setting a plurality of wind speed monitoring above each peak point, conduct wind field simulation analysis, and determine the wind speed at each wind speed monitoring point; according to the wind speed at each wind speed monitoring point, determine the similarity coefficient of the wind speed profile between two adjacent peaks in turn; when the similarity coefficient is less than or equal to the convergence tolerance , the sum of the distances between the previous peak of the two adjacent peaks and the previous peaks in the direction of continuous peak arrangement is determined as the length of the peripheral flow field. In the present invention, it is convenient to carry out wind field simulation analysis, which is beneficial to the calculation of the computer, and can effectively improve the accuracy of the calculation of the peripheral flow field length, thereby ensuring the accuracy of the wind field simulation analysis results, not only applicable to simple terrain, Also suitable for complex terrain.