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

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 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 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 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 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.

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 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 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.