49 results about "Digital simulator" patented technology

An x-ray diagnostic apparatus and methods performs Real-Time Digital Radiography with particular application in dental x-ray imaging modalities, such as Orthopantomography, Scannography, Linear Tomography and Cephalography, by using a versatile and modular electronic unit, featuring ultra fast computation capability to serve diversified image sensor typology and scanning modality.

In Digital Orthopantomography and Scannography, a plurality of tomographic images at different depths of the jaw can be generated, based on the pre-selection made by the user interface.

The image processing unit utilizes for the tomo-synthesis of the diagnostic image an accurate and economic digital simulator of the radiographic film speed, including a digital frequency synthesizer fed with film cassette speed digital input and high resolution clock signal, ensuring accurate and reproducible phase continuity of the output frequency signal.

It also introduces an automatic adaptation of the frame acquisition rate in frame transfer mode, based on the actual speed of the cassette unit. By this method the dynamic of the exposure signal is reduced, and a better optimization of the signal response of the x-ray detector is achieved.

The fault ride-through and power smoothing system includes a buck converter for Maximum Power Point Tracking (MPPT) of a PV array power system, a buck-boost converter to connect a supercapacitor energy storage system (SCESS) to the DC link, and a voltage source converter (VSC) to transfer the DC link power to the grid. Three independent controllers are implemented, one for each power electronics block. The effectiveness of the controllers is examined on Real Time Digital Simulator (RTDS).

The invention relates to the field of electrical power systems, in particular to a power level digital-analog hybrid simulation system. The power level digital-analog hybrid simulation system comprises a hardware circuit and a digital model, wherein the hardware circuit is used for achieving the power conversion between the digital side and the physical side and feedback signal acquisition input at the physical side, the digital model is used for achieving historical current calculation, delay compensation, current output at the digital side and voltage acquisition input at the physical side and decoupling a line model. The power conversion is carried out between the hardware circuit and the digital model, a digital simulator is connected with a device to be simulated in the physical side through the hardware circuit, calculation is completed by the digital model, calculating parameters are output to the hardware circuit, meanwhile, the hardware circuit feeds back electrical parameters to the digital model to serve as input, and the power level digital-analog hybrid simulation between the digital side and the physical side is achieved. The power level digital-analog hybrid simulation system adopts hardware and software sources, achieves power level hybrid simulation of the digital simulator and a physical simulation device, and solves the problems that access to actual power primary equipment such as a generator, a transformer, a line and a converter cannot be achieved and the simulation scale is small.

The invention discloses a display system and a display method for operating characteristics for an alternating-current and direct-current power grid based on RTDS (real-time digital system) real-time digital simulation. The display system is equipped with a simulation workbench for establishing an alternating-current and direct-current power grid model, a real-time digital simulator, a protocol conversion card, an interchanger and a power grid characteristic display device; the real-time digital simulator is used for outputting analog amount and digital amount to the power grid characteristic display device through the protocol conversion card and the interchanger; the power grid characteristic display device is used for returning an operation control order to the digital simulator in real time through the interchanger and the protocol conversion card. The display system further comprises a transient data processing unit which is equipped with a transient data extracting unit and a conversion unit; the power grid characteristic display device is equipped with a transient database, a variable database, a searching mapping unit and a replay display device. The display system can be used for realizing visual display of power grid operation characteristics of steady state data, transient data and the like, is reliable in performance, simple and practical.

A hybrid simulation method uses a simulator tool feeding kinematics commands to a movement simulator on which a moving body is mounted and to a target representative of an objective to be reached by the moving body, and on detection of an event representative of overshooting or changing a first designated objective for this moving body, the method includes a positioning stage associated with a second designated objective for the moving body, including comparing positions executed by the movement simulator in response to transition kinematics commands with a first predetermined setpoint position and activating a first marker if a position substantially the same as the first setpoint position is detected; comparing positions executed by the target in response to transition kinematics commands with a second predetermined setpoint position and activating a second marker if a position substantially the same as the second setpoint position is detected; when the first and second markers are activated, a step of evaluating a difference between the current kinematics command supplied to the movement simulator and the target by the digital simulator tool; and, if this difference is below a particular threshold, a piloting stage including applying corrective terms linked to the setpoint positions to the kinematics commands coming from the simulator tool before they are fed to the movement simulator and to the target.

A simulator includes a memory for storing a first netlist, a timing library, and a standard parasitic exchange format (SPEF) file; and a processor configured to compensate for delay to synchronize digital and analog signals. The processor includes a delay calculator module for generating one of a rising time and a falling time and a standard delay format (SDF) file using the first netlist, the timing library, and the SPEF file; an SDF file converter module for adjusting an interconnect delay description included in the SDF file to compensate for delay using the one of the rising time and the falling time; and a digital simulator module for generating an event using a first driving cell according to a compensated interconnect delay description.

Sequential digital integrated circuits have stable state nodes that are capable of retaining their state (logic value) even in the absence of any input directly driving these points. However, in addition to stable state nodes, some custom-designed digital circuits have so-called transient state nodes. A transient state node is defined as node that can directly affect the value of a stable state node and is combinatorially driven by inputs of the circuit, but the transition delay from at least one input to the node is greater than a predefined threshold value. Identifying such transient state nodes, along with the stable state nodes, is critical for the efficient simulation of custom digital circuits by a hierarchical device level digital simulator. A method is provided herein for identifying transient state nodes in a digital circuit, given the circuit's netlist and the identity of the stable state nodes in the circuit.

The invention relates to a solar energy-based control system of a police electric patrol vehicle. The solar energy-based control system comprises a solar cell panel, a voltage regulation system, a microprocessor, a digital simulator and a control circuit system, wherein the solar cell panel is used for converting solar energy to electric energy and is connected through a wire, the voltage regulation system is used for regulating a voltage to an adaptive voltage and providing the electric energy for the microprocessor to work, the microprocessor is used for processing data, making an instruction and providing the electric energy for a load by externally connecting the digital simulator, and the control circuit system is used for achieving the charging process of a storage battery pack by a control switch. The solar cell panel is used for converting the solar energy to the electric energy, the electric energy is stored in a storage battery for use, and the environmental-friendly requirements of cleanness, greenness, energy saving and zero emission are really achieved.

The invention discloses a hardware-in-loop test method and test system suitable for an automatic terminal. The power distribution network simulation model is built in the digital simulator, the faultworking condition is preset, a large number of simulation fault test quantities can be provided for tests under the condition that real power grid faults do not occur, and the built power distributionnetwork simulation model has fault characteristics of a real power distribution network; a digital simulator transmits simulated analog fault test quantity to the ATU to be tested on site, and the ATU to be tested transmits switch action signals back to the digital simulator, so that closed-loop test is realized, and dynamic control characteristics of the automatic terminal are truly reflected. According to the test method, all ATUs participating in the test are connected in the same local area network through the switch, communication layer intercommunication is achieved, interconnection andintercommunication tests can be achieved on ATUs produced by different manufacturers, the test method is not limited by the space where the ATUs are located any more, and mining and analysis of ATU cooperation problems are greatly facilitated.

The invention discloses an experimental facility for simulating a wind turbine. The experimental facility comprises a digital simulator, a computer, a PCI (Peripheral Component Interconnect) data acquisition card, a motor driver, an electric motor, a coupler 1, a rotating speed and torque sensor, a coupler 2, an electric generator, a current sensor and a voltage sensor; a wind turbine mathematical model in the digital simulator is adopted to calculate the torque of the wind turbine according to the input wind speed curve, the pitch angle, the rotating speed fed back by the electric generator, the torque of the wind turbine and the torque fed back by the electric generator are calculated by a PID (Proportion Integration Differentiation) controller in the digital simulator to obtain a motor torque command; the digital simulator carries out sampling on the rotating speed and torque sensor by the PCI data acquisition card in each sampling period to obtain the feedback rotating speed and the feedback torque of the electric generator, and besides, the motor torque command is input to the motor driver to regulate the output torque of the motor to drive the electric generator to rotate. The experimental facility can simulate the running characteristic of the wind turbine in a practical working condition in a laboratory without wind field environment or the wind turbine.

The invention discloses a feeder automation test system based on an RTDS real-time digital simulator. The system comprises the RTDS real-time simulator, a power amplifier connected with the RTDS real-time simulator based on a signal line, an analog circuit breaker and an analog power distribution main station system. In the embodiment of the invention, a test environment closer to reality is provided, more test samples are provided, and the automation degree is high.

The invention provides a source-grid coordinated real-time simulation system. The system comprises a source side simulation machine cluster, a coordination server, a grid side real-time digital simulator RTDS system, a grid energy management system EMS and an automatic generation control AGC scheduling system. With application of the source-grid coordinated real-time simulation system, simulation of various types of generator sets can be realized through the source side simulation machine cluster, and grid side simulation can be realized through combination of the grid side RTDS system. With application of source-grid coordinated simulation, the problem that the power system simulation platform in the prior art cannot effectively simulate the faults of various types of grids and various generator sets can be solved, panoramic coordinated simulation between the source, and the grid and the multilevel scheduling center can be realized so that the conditions are provided for the research of the grid scheduling new mechanism after large-scale new energy grid connection.

The invention provides a feeder automation function testing device which comprises a main controller, a real-time digital simulator and a plurality of power distribution terminal testers. The main controller is connected with the real-time digital simulator and connected with the plurality of power distribution terminal testers through a wireless network. Each power distribution terminal tester isconnected with a tested power distribution automation terminal. The main controller is used for building a power distribution network real-time digital simulation model according to the power distribution network frame structure of a tested feeder automation configuration region and an operation mode of the power distribution network frame structure. The real-time digital simulator is used for carrying out real-time simulation according to the power distribution network real-time digital simulation model and generating waveform files of different network nodes on the same section. The feederautomation function testing device provided by the invention can test the power distribution automation terminal in a non-laboratory environment, and has a positive significance for popularization offeeder automation function testing.

A method includes operating a digital simulator to mimic loading effects of digital circuit blocks of a circuit design on analog circuit blocks of the circuit design. The digital simulator sets a current signal timing and a current level value at an analog/digital boundary between the digital circuit aspects and the analog circuit aspects. The analog simulator is operated to apply the current signal timing and the current level value to simulate the analog circuit blocks.

The invention provides a closed-loop simulation system for optical measurement of direct-current power transmission engineering. The closed-loop simulation system comprises a real-time digital simulator, an optical measurement simulation interface, a merging unit and a control protection device; the real-time digital simulator simulates multiple paths of electrical quantity signals of optical measurement of the direct-current power transmission project, and outputs the multiple paths of electrical quantity signals to the optical measurement simulation interface through a simulation communication protocol; the optical measurement simulation interface converts the simulation communication protocol into a communication protocol actually used by an optical measurement direct-current power transmission project; the merging unit merges and synchronizes the multiple paths of electric quantity signals and outputs the processed electric quantity signals to the control protection device; and thecontrol protection device receives the electric quantity signal sent by the merging unit. Accurate simulation of a high-speed sampling link of direct-current power transmission engineering optical measurement is realized, high-sampling-frequency electrical quantity can be output to an engineering optical transformer merging unit, direct-current engineering rapid protection test requirements are met, and the realization method is simple and convenient to operate.

The disclosure provides a real-time combined simulation platform and method for a fine wind energy conversion system. The real-time combined simulation platform comprises a real-time host and a real-time digital simulator RTDS; the real-time host is provided with OpenFAST software suitable for a real-time operating system, a real-time controller running under a real-time thread, and an open-sourcereal-time network protocol stack RTnet; various fan-related models are established in the OpenFAST software; an electrical part model of a wind turbine generator is built in the RTDS, wherein the RTDS is used for simulating the on/off state of a converter and an electromagnetic transient state of the generator; data interaction is carried out between the OpenFAST software and the real-time controller through a shared memory variable mode, real-time bidirectional communication is carried out between the real-time host and the RTDS through the RTnet, and complete closed-loop simulation is formed. According to the platform and the method in the disclosure, the open-source real-time operating system expansion, the open-source OpenFAST software which has passed the GL certification and the open-source real-time network protocol framework are used, so that the platform cost can be greatly reduced under the condition that the simulation precision is guaranteed.

The invention discloses a space manipulator teleoperation simulation training system and method. The system comprises simulation training interaction equipment, a simulation training server, a space manipulator digital simulator and a training guidance evaluation subsystem. The simulation training interaction equipment is used for receiving space manipulator control information input by an operator; the simulation training server is used for generating a space manipulator control instruction and predicted operation data according to the space manipulator control information; the space manipulator digital simulator is used for generating actual operation data according to the space manipulator control instruction and sending the actual operation data to the simulation training server; and the training guidance evaluation subsystem is used for planning a training process and training project management to obtain a planning result, and determining a training effect according to the planning result and the actual operation data. The technical problem that in the prior art, the requirement of operators for space manipulator teleoperation control training cannot be met is solved.

The invention discloses a test system and a test method for a high-resistance grounding identification device of a power distribution network. A waveform mixing method is adopted to randomly mix a real waveform, a simulation waveform and an interference waveform, the trueness of a fault waveform is ensured based on the actually measured real waveform, and the comprehensiveness of a fault environment is ensured by the simulation waveform. Meanwhile, an interference model is considered, the anti-interference performance of the device in actual operation can be verified, the recognition accuracy, the misjudgment rate and the missed judgment rate of the high-resistance grounding recognition device in various fault environments are analyzed, and a reliable basis is provided for research, development and delivery of the high-resistance grounding recognition device. The technical problem that an existing test method based on a real-time digital simulator and an existing test method based on a power distribution network real-model laboratory can hardly meet actual application and flexibly adjust a fault waveform is solved.