40 results about "High fidelity simulation" patented technology

A method and system for modeling aerodynamic interactions in complex eVTOL configurations for realtime flight simulations and hardware testing which includes decomposing the aircraft into aerodynamic subcomponents, wherein the interactions between these components are handled by flow simulations of the surrounding fluid, which may be Euler flow CFD simulations. A computer generated simulation can be used to analyze the fluid flow and pressures, the forces delivered by an aircraft into the fluid and the forces onto the aircraft from the fluid, to determine the position and attitude of the aircraft, and other aspects. The system may be used as a flight simulator for pilot training in a realtime environment. The system may be used to support component testing using an interface to those components, such as flight electronics and actuators, to test the components in high fidelity simulations of actual flight demands on those components. The system may also be used to support design analysis in non-realtime to run numerous simulations on different designs and to provide comparative output.

The invention relates to a high-fidelity rotation speed signal simulator based on double DDSes. The high-fidelity rotation speed signal simulator based on the double DDSes is mainly characterized by being composed of the two DDSes and an embedded type controller, the first DDS provides clock pulse signals for the second DDS, the second DDS periodically updates data of arbitrary waveforms of a RAM storage area of the second DDS to a D / A converter to generate arbitrary waveforms under the clock control of the first DDS, the embedded controller is used for defining the waveform frequency and waveform data, the waveform data are loaded to the RAM storage area of the second DDS, and the first DDS is controlled to generate clock pulse signals according to the waveform frequency. The high-fidelity rotation speed signal simulator based on the double DDSes generates complex and variable rotation speed simulation signals through the double-DDS technology, can define the signal waveforms arbitrarily, is high in frequency resolution, efficiently and easily resolves the problem of high-fidelity simulation of rotation speed signals in an aero-engine controller hardware-in-loop simulation experiment, and improves the fidelity of the simulation experiment.

The invention discloses a plasma particle-field Vlasov-Maxwell system long-term, large-scale and high-fidelity analog method which comprises the steps that a plasma system requiring analog computation is determined, and a related expression manner is obtained; the related expression manner is subjected to discrete treatment, and the Marsden-Weinstein Poisson bracket and the Hamiltonian of the system are discrete according to the expression manner subjected to discrete treatment; according to the discrete Marsden-Weinstein Poisson bracket and Hamiltonian of the system, an evolution equation of plasma particles and an electromagnetic field is obtained; the evolution equation of the plasma particles and the electromagnetic field is treated with an Euler-symplectic algorithm, and a discrete format is obtained by iterative solution, so that plasma particle-field Vlasov-Maxwell system long-term, large-scale and high-fidelity analog is realized. Long-term numerical accuracy and conservativeness of the analog process can be ensured with the method, and high-fidelity and long-term analog can be ensured.

The invention provides a vortex-induced vibration simulation method for an elastic support rigid cylinder structure under the action of a nonlinear energy trap in the field of computational fluid mechanics numerical simulation. The vortex-induced vibration simulation method comprises the following steps: firstly, establishing a two-dimensional drainage basin and a geometric model of the two-degree-of-freedom elastic support rigid cylinder structure; secondly, respectively carrying out grid division on the two-dimensional drainage basin and the structural domain, and carrying out interpolationon the two sets of grids by utilizing a nested grid technology to form a flow field calculation grid; establishing a computational structural mechanics model under the action of the NES, combining thecomputational structural mechanics model with the computational fluid mechanics model, and performing cylinder fluid-solid coupling numerical calculation; and finally, carrying out post-treatment toobtain the vortex-induced vibration characteristic of the cylinder structure under the action of the NES and the inhibition effect of the NES on the vortex-induced vibration of the cylinder structure.According to the method, the vortex-induced vibration high-fidelity simulation model of the two-dimensional cylinder structure under the action of the NES is established on the basis of a computational fluid mechanics method, a structural dynamics theory and a nested grid technology, a numerical prediction result has high credibility, and reference is provided for researching cylinder vibration reduction.

The invention discloses a method for inhibiting ice load of an offshore wind turbine based on variable pitch control. The method comprises that: firstly, a wind turbine mechanism model, an ice load mechanism model and a structural vibration mechanism model are established for qualitatively and quantitatively analyzing the influence of the ice load on the wind turbine; then, the influence of different types of ice loads on the draught fan is determined through field testing or simulation, the influence comprises power fluctuation and mechanical fatigue load increase, and a proper control targetis selected according to the influence of the ice loads on the draught fan; then, the pitch angle is used as a controlled variable, and the ice load of the offshore wind turbine is restrained througha variable pitch control mode of predictive control or robust control or optimal gain scheduling control; preferably, a predictive control mode is adopted; and finally, based on field fan actual testing or high-fidelity simulation software, the inhibiting effect of variable pitch control on the ice load is verified.

The invention discloses a general framework for high-fidelity satellite simulation of a navigation satellite platform, which includes a main processing unit and a dynamic library and a database plugged into the main processing unit; the main processing unit includes a telemetry parameter processing module, a remote control instruction criterion processing module, and a telemetry acquisition module and the dynamic library interface management module; the dynamic library interface management module is connected with the telemetry parameter processing module, the remote control instruction criterion processing module, and the telemetry acquisition module respectively, and the telemetry parameter processing module is connected with the telemetry acquisition module; the dynamic library and the database are connected with the dynamic library interface management The modules are connected; wherein each satellite code name corresponds to a group of dynamic libraries that are plugged in, and each dynamic library corresponds to a subsystem of the satellite, which is used to simulate the functions of the subsystems; using the present invention can build a general platform for high-fidelity satellite simulation, improving the Simulation software development efficiency.

The invention discloses a thrust-load-simulation hydraulic system of a tunnel boring machine. A rodless cavity of a thrust oil cylinder is communicated with an oil opening of a thrust oil path, a rod cavity of the thrust oil cylinder is communicated with another oil opening of the thrust oil path, and the thrust oil cylinder is connected with a piston rod of a thrust-load oil cylinder; an oil inlet of a reset one-way valve is communicated with a large cavity of the thrust-load oil cylinder and an oil tank; one path of an oil outlet of the reset one-way valve is communicated with the rod cavity of the thrust-load oil cylinder, and the other path of the oil outlet of the reset one-way valve is connected with the oil tank after passing through a slender hole electromagnetic proportional throttle valve, a thin cutting edge electromagnetic proportional throttle valve and an electromagnetic proportional overflow valve; an oil inlet and an oil outlet of an oil and liquid air-cooling valve group are communicated with the oil tank. According to the thrust-load-simulation hydraulic system of the tunnel boring machine disclosed by the invention, the electromagnetic proportional throttle valve and the electromagnetic proportional overflow valve with different opening forms are connected in series and are subjected to uniform parameter adjustment, so that the setting of the thrust-load, the setting of rock-soil static pressure and the advance speed are considered in an unified manner to realize high-fidelity simulation of the thrust-load of the tunnel boring machine. The thrust-load-simulation hydraulic system is also suitable for other dynamic simulation occasions of linear thrust-load.

An easy and cost-effective method of generating high fidelity simulation service loads. This invention, however, provides a simple but theoretically sound approach to conducting an accelerated simulation test, while obtaining a reasonable acceleration rate for the test. The method includes the steps of developing a service load history database; combining multiple time series models; adjusting the change of each time series model creating an accelerated service load model; regenerating a random vibration load data; and feeding the load data to drive an actuator for a high fidelity random vibration simulation test.

An infrared (IR) transceiver having a receiver chain with an isolated analog output, includes a transmission gate and a unity gain buffer interposed between the amplifier output and an analog output pad. The transmission gate behaves as a switch, passing the analog output signal to the analog output pad only when an analog output is required. The unity gain buffer has a high input resistance, a low input capacitance, a unity gain and a low output impedance, so that the load of a digital signal processing (DSP) device or measuring instrument on the analog output pad is isolated and does not affect the performance of the receiver chain. Since the transfer rates of the transmission gate and the buffer are each unity, the analog output pad provides a high fidelity analog output signal to the output buffer.

The invention discloses a high-fidelity satellite fault simulation method for a navigation satellite platform. The navigation satellite platform includes a main processing module and various subsystem simulation modules attached to the main processing module, and fault simulation model units are preset in each subsystem simulation module. , adding a fault information processing unit to the main processing module; after the fault information processing unit compares the satellite fault information, it distributes the satellite fault information to the corresponding fault simulation model unit in the subsystem simulation module, performs fault phenomenon simulation, and finally performs fault Solution injection and validation. The invention simulates satellite on-orbit fault phenomena, and responds to faults through telemetry to provide a basis for fault analysis; executes a fault solution plan, verifies the correctness of the fault solution, and provides powerful help for satellite fault elimination.

The invention belongs to the field of in-situ measurement technology and application of marine natural gas hydrate geochemical parameters. The in-situ detection and simulation system of hydrate geochemical parameters in deep sea sediments of the present invention includes a laser Raman spectrum detection system (I), a deep sea environment simulation system (II), a hydraulic system (III) and a real-time monitoring and processing system for parameters (IV ), the deep-sea environment simulation system (II) is electrically connected with the laser Raman spectroscopy detection system (I), and the parameter real-time monitoring and processing system (IV), respectively, and the hydraulic system (III) is set in the deep-sea environment simulation system (II). It eliminates the uncertainty caused by sampling and non-situ measurement; it is simple, real-time, and efficient; it can safely obtain high-fidelity information in the high-pressure simulation cabin. In addition, the device can also be used for laboratory simulation of hydrate production methods and its real-time monitoring.

The invention relates to simulation equipment for simulating a PMG (Permanent Magnet Generator) alternating-current power supply. The simulation equipment for verifying the complex electromagnetic working environment of a high-safety flight control system is applied to electromagnetic compatibility of the flight control system and high-fidelity simulation of the PMG alternating-current power supply of power supply input verification. PMG is a permanent magnet generator installed on an engine, can generate power when working together with the engine, and thus is difficult to use in verification of the flight control system. The variable frequency and variable voltage broadband alternating-current power supply simulation equipment comprises a broadband transformer, a broadband inductor, a protective tube and a varistor, meets the test requirement of the flight control system, and completely simulates the characteristics of different working states of the airborne PMG. The broadband range is 1407-2836Hz.

The invention discloses a tunnel boring machine torque load simulation hydraulic system. The tunnel boring machine torque load simulation hydraulic system comprises a rotating part, a speed increaser, a load simulation pump, a closed loop safety valve set, an oil outlet check valve set, a long and thin hole magnetic proportional throttle valve, a thin-cutting-edge magnetic proportional throttle valve, a magnetic proportional overflow valve, an oil air-cooling valve set, an oil supplementing check valve set and an oil supplementing loop. The magnetic proportional throttle valve and the magnetic proportional overflow valve different in opening type are connected in series, parameter adjustment is performed in a unified mode, and torque load setting, rock-soil static pressure setting and cutter disc rotation speed are considered in a unified mode, so that high-fidelity simulation of torque load of a tunnel boring machine is achieved. The load valve set scheme is suitable for dynamic simulation of other types of loads as well.

The invention belongs to the technical field of production control, and in particular relates to a multi-fidelity simulation optimization method and equipment applied to workshop planning and production. This method optimizes the problem of workshop planning and production by using two fidelity levels of simulation models: first, a high-fidelity and low-fidelity simulation model is established based on the actual production system; then a low-fidelity simulation model is used, combined with the optimization iteration of the GA algorithm Search the solution space of the production planning problem; use the sampling method with ordinal transformation and optimal sampling to sample according to the results obtained by running the low-fidelity model to obtain the optimal sampling set; finally run the optimal sampling through the high-fidelity simulation model Since the high-fidelity model is very similar to the actual production system of the workshop, using the high-fidelity model to run the production plan in the optimal sampling set can obtain relatively accurate results, so this result can be used as a basis to select the optimal production plan.

The invention relates to a high-fidelity rotation speed signal simulator based on double DDSes. The high-fidelity rotation speed signal simulator based on the double DDSes is mainly characterized by being composed of the two DDSes and an embedded type controller, the first DDS provides clock pulse signals for the second DDS, the second DDS periodically updates data of arbitrary waveforms of a RAM storage area of the second DDS to a D / A converter to generate arbitrary waveforms under the clock control of the first DDS, the embedded controller is used for defining the waveform frequency and waveform data, the waveform data are loaded to the RAM storage area of the second DDS, and the first DDS is controlled to generate clock pulse signals according to the waveform frequency. The high-fidelity rotation speed signal simulator based on the double DDSes generates complex and variable rotation speed simulation signals through the double-DDS technology, can define the signal waveforms arbitrarily, is high in frequency resolution, efficiently and easily resolves the problem of high-fidelity simulation of rotation speed signals in an aero-engine controller hardware-in-loop simulation experiment, and improves the fidelity of the simulation experiment.