scholarly journals Impact of Modeling Simplifications on Lightning Strike Simulation for Aeroengine

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Yi-fan Qian ◽  
Zhi-feng Ye ◽  
Hai-bo Zhang
Keyword(s):  
Simulation Analysis ◽  
Simulation Software ◽  
Simplified Model ◽  
Lightning Strike ◽  
Electromagnetic Simulation ◽  
Experimental Conditions ◽  
Turbofan Engine ◽  
Engine Model ◽  
Simulation Results ◽  
The Difference

With the development of electromagnetic simulation software and affordable hardware, it is allowed for us to complete simulations for EMC purposes. However, simulation demands will be immense when simulations for models with complex structures, especially aircraft components, have to be solved. Hence, it is meaningful to investigate how to minimize the computational demands. One of the solutions to reduce the simulation expense is the simplification for the simulated model. But the simplified model should be guaranteed to provide credible simulation results which do not deviate from the original model apparently. Generally, the difference between the simulation results and experimental data is estimated, or if the experimental conditions are not achieved, the comparison between the simplified model and the original one has to be analyzed, at least. This paper explores the electromagnetic simulation of a turbofan engine encountering lightning strike. With the simplifications of different components on the turbofan engine, the influences on induced currents of engine controller cables are simulated and analyzed based on the transmission-line matrix method. A combining method of components removal and geometric structure simplification is proposed to simplify the whole engine model. Simplified components include compressor, combustion chamber, turbine, and nozzle. The effects of different simplification methods are quantified, and the rationality of the simplified model is verified by simulation analysis.

Micro-Defects Test Simulation Analysis and Experiment Research under Alternating Electromagnetic Excitation

2013 ◽  
Vol 798-799 ◽  
pp. 452-455
Author(s):  
Xia Yu ◽  
Wei Ming Zhang ◽  
Zhong Chao Qiu ◽  
Cheng Feng Chen
Keyword(s):  
Simulation Analysis ◽  
Crack Depth ◽  
Simulation Software ◽  
Good Effect ◽  
Electromagnetic Simulation ◽  
Test Results ◽  
Current Field ◽  
Electromagnetic Excitation ◽  
Simulation Results ◽  
Alternating Magnetic Fields

Alternating current field Measurement is one of the important progresses about electromagnetic nondestructive testing in recent years. Alternating magnetic fields excitation testing model is established by using electromagnetic simulation software ANSOFT, a flat plate crack defects are simulated. By analyzing its principle, crack depth and the width change influence on test results, finally the simulation results are verified by the method of experiment. The experimental results are consistent with the simulation results. The results show that this differential probe has good effect on crack defects test.

Simulation on Probe-Fed Rectangular Patch Antenna with the Minkowski Fractal Structure

2014 ◽  
Vol 971-973 ◽  
pp. 1148-1151
Author(s):  
Ruo Yan Han ◽  
Wei He ◽  
Ping Lu ◽  
He Ling Cai ◽  
Jiao Hong
Keyword(s):  
Resonant Frequency ◽  
Patch Antenna ◽  
High Frequency ◽  
Fractal Structure ◽  
Simulation Software ◽  
Electromagnetic Simulation ◽  
Rectangular Patch ◽  
Simulation Results ◽  
Application Requirements ◽  
Minkowski Fractal

The probe-fed rectangular patch antenna with the Minkowski fractal structure which for 2.45GHz was simulated by using high frequency electromagnetic simulation software HFSS V11.The Simulation results showed that it was similar to side-fed square patch antenna with the Minkowski fractal structure. The resonant frequency decreased with fractal iteration, and the size of the antenna could be miniaturized. And antenna pattern unchanged with fractal iteration mostly, which meet the application requirements basically.

scholarly journals Reference and Limit Governors for Limit Protection of Turbofan Engines

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2803 ◽  
Author(s):  
Wenhao Xu ◽  
Muxuan Pan ◽  
Jiakun Qin ◽  
Jinquan Huang
Keyword(s):  
Invariant Sets ◽  
Multiple Constraints ◽  
Turbofan Engine ◽  
Turbofan Engines ◽  
Admissible Sets ◽  
Engine Model ◽  
Engine Control System ◽  
Engine Thrust ◽  
Simulation Results ◽  
Limit Protection

This paper proposes a novel architecture of limit protection including the references governors and limit governors and applies this architecture to limit protection in turbofan engines. References governors are designed as add-on schemes to a pre-stability engine control system that modifies reference commands to avoid constraints violation. Limit governors are proposed as an assistant part for references governors adjusting constraints to prevent references from stopping updates. The use of output admissible sets for a class of variable constraints is exploited to form invariant sets. Simulation results based on a turbofan engine model show that references governors with limit governors can effectively enforce the multiple constraints and provide enhanced engine thrust when steady violation occurs.

scholarly journals Experimental Study and Simulation Analysis on Electromagnetic Characteristics and Dynamic Response of a New Miniature Digital Valve

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Meisheng Yang ◽  
Junhui Zhang ◽  
Bing Xu
Keyword(s):  
Experimental Study ◽  
Dynamic Simulation ◽  
Dynamic Characteristics ◽  
Electromagnetic Force ◽  
Simulation Analysis ◽  
Electromagnetic Properties ◽  
Electromagnetic Simulation ◽  
Electromagnetic Structure ◽  
Electromagnetic Characteristics ◽  
Simulation Results

In order to get the better electromagnetic characteristics of the micro digital valve, the larger electromagnetic force should be obtained in the smaller electromagnetic structure. The electromagnetic force directly determines the electromagnetic properties of the miniature digital valve. The electromagnetic force test is studied in the paper. The results of electromagnetic simulation results are basically consistent with the experimental results. The simulation model is reliable and accurate. The dynamic simulation results show that the dynamic characteristics of the miniature digital valve meet the requirements of the digital hydraulic technology. Design of the new micro digital valve is reasonable.

SIMULATION ANALYSIS OF SPARK IGNITION ENGINE INTAKE MANIFOLD FOR BETTER PERFORMANCE

2017 ◽  
Vol 79 (7-4) ◽  
Author(s):  
Muhammad Hariz Khairuddin ◽  
Muhammad Fitri Shamsul Bahri ◽  
Afiq Aiman Dahlan ◽  
Mahadhir Mohammad ◽  
Mohd Farid Muhamad Said
Keyword(s):  
Engine Speed ◽  
Simulation Analysis ◽  
Engine Performance ◽  
Simulation Software ◽  
Spark Ignition Engine ◽  
Intake Manifold ◽  
Engine Simulation ◽  
Engine Model ◽  
Air Intake ◽  
Manifold System

Intake manifold system is one of the important component in the engine system which functions to evenly distribute the air flows into every cylinder of the engine. With the restricted air intake rule regulation, the intake air system for a car must be properly design in order to minimize the performance dropped caused by the restrictor. The paper presents the study on the effects of intake design parameter towards the performance of the engine and then improves the performance of previous intake manifold system. This study starts with the development of Honda CBR 600RR engine model and intake manifold system model using GT-Power engine simulation software to be used for the simulation purposes. After developing the reference engine model, the parametric study was carried out to study the effect of the intake manifold parameter design on the engine performance. The optimization process was then performed to achieve the target of improvement which has already been set prior to performing the optimization. The final results show an increase up to 4.83% and 4.45% of torque and air flow rate respectively at the desired operating range of engine speed.

scholarly journals The influence of climatic conditions on the efficiency of the solar system

2020 ◽  
Vol 167 ◽  
pp. 05002
Author(s):  
Viacheslav Shemelin ◽  
Tomas Matuska
Keyword(s):  
Solar System ◽  
Solar Collector ◽  
Simulation Analysis ◽  
Climatic Conditions ◽  
Simulation Software ◽  
Hot Water ◽  
Apartment Building ◽  
Time Step ◽  
Simulation Results ◽  
One Year

The simulation analysis of the solar hot water preparation system for an apartment building is presented. The analyses investigated the effect of climatic conditions on the efficiency of the solar system. To demonstrate the influence of climatic conditions, four building locations (Stockholm, Prague, Milan, and Barcelona), six different solar collectors, and six different design areas of solar collector field were used. The aim was to verify how the efficiency of the solar system varies depending on the climatic and design conditions. Moreover, the influence of year-to-year fluctuations of climatic conditions was also explored. The analysis has been provided by using TRNSYS simulation software over the period of one year using the time step of 2 minutes. The simulation results clearly showed that the efficiency of the SDHW system is dependent on the climatic conditions, especially on the air temperature. On the other hand, year-to-year weather fluctuations do not strongly affect the efficiency of the SDHW system.

scholarly journals Polarimetric Imaging in the Environment Containing Medium and Object

2022 ◽  
Vol 9 ◽  
Author(s):  
Daqian Wang ◽  
Xin Wang ◽  
Peifeng Pan ◽  
Jun Gao
Keyword(s):  
Polarized Light ◽  
Scattering Medium ◽  
Complex Environment ◽  
Simulation Experiments ◽  
Experimental Conditions ◽  
Polarimetric Imaging ◽  
Simulation Results ◽  
The Difference ◽  
Difference Imaging ◽  
Circular Polarized Light

Polarimetric imaging has been studied and applied to the problem of visibility restoration in various scenarios such as haze, mist and underwater. Although studies have shown that under certain conditions, circular polarimetric imaging has certain advantages over linear polarimetric imaging, however, for a complex environment containing both scattering medium and object, the performance of linear and circular polarimetric imaging is affected by many factors. In this paper, the propagation of linear and circular polarized light in the scattering medium is theoretically analyzed, then the simulation experiments under different experimental conditions are carried out and the conclusions are summarized. In order to validate the simulation results, the measurement experiments are carried out in dynamic smoke scenarios with different smoke concentrations. The results show that, the propagation of the polarized light, especially the circular polarized light, is determined by medium conditions. Generally, both the linear and circular polarimetric imaging had an ability to reduce the image degradation caused by smoke, however, under some certain environment conditions, unlike the linear polarized channels, the difference between the orthogonal circular polarized channels may be approached or even reversed, which may limit the circular polarization-based difference imaging and visibility restoration performance.

Experiment and FEM Simulation Analysis on Cooling Characteristics of the Pork Tissue with Skin in Liquid Nitrogen Cryotherapy

2014 ◽  
Vol 675-677 ◽  
pp. 1664-1669
Author(s):  
Yan Zhe Zhao ◽  
Jie Sun ◽  
Ke Yu Wang
Keyword(s):  
Liquid Nitrogen ◽  
Simulation Analysis ◽  
Therapeutic Process ◽  
Three Dimensional ◽  
Fem Simulation ◽  
Treatment Method ◽  
Manual Operation ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
The Difference

Liquid nitrogen cryotherapy is an effective treatment method for skin disease. However, due to the manual operation in the therapeutic process, the treatment effect is difficult to reach. Aimed this problem, the process of freezing in liquid nitrogen was explored. Firstly, the experiment of liquid nitrogen cryotherapy on pork with skin tissue is conducted to investigate the temperatures variation with time. Secondly, three-dimensional numerical simulation of liquid nitrogen cryotherapy was performed. According to the difference in the results of the simulation and experiment, the causes of differences are analyzed and related parameters are optimized. At last, the optimized parameters make the simulation results closer to the experimental results, and provide a reference for the simulation of human skin.

Application of Matlab to write a Script for HFSS’s Eigenmode Solution of Circular Cavity

2013 ◽  
Vol 385-386 ◽  
pp. 1240-1243
Author(s):  
Ai Guo Ji ◽  
De Shui Liu
Keyword(s):  
Electromagnetic Field ◽  
Numerical Methods ◽  
Rapid Development ◽  
Simulation Software ◽  
Innovative Approach ◽  
Electromagnetic Simulation ◽  
Circular Cavity ◽  
Design Requirements ◽  
Simulation Results ◽  
Scripting Language

With the rapid development of modern electromagnetics, a lot of electromagnetic field numerical methods are maturing. 3D electromagnetic simulation software HFSS has two solutions including incentive solving and eigenmode solving. When solving the calculation of the structure of eigenmodes or resonant type can use eigenmode solver. Using matlab generate HFSS scripting language-based program to set eigenmode solution is a very convenient and very innovative approach. The program on a circular cavity modeling and eigenmode solution set simulation results meet the design requirements.

scholarly journals Simulation Analysis on Partial Discharge Signals Produced by Multiple Insulation Defects in GIS

2020 ◽  
Vol 165 ◽  
pp. 06040
Author(s):  
Yuxin Yun ◽  
Guangke Xu ◽  
Weiwei Zhang ◽  
Xing Li ◽  
Lingying Chen
Keyword(s):  
Electromagnetic Field ◽  
Simulation Analysis ◽  
Partial Discharge ◽  
Simulation Software ◽  
Impact Response ◽  
Current Signal ◽  
Linear Convolution ◽  
Simulation Results ◽  
Gas Insulated Substation ◽  
Linear Mixtures

In this paper, the simulation analysis on partial discharge (PD) signals produced by multiple insulation defects in gas insulated substation (GIS) has been researched by the simulation software of electromagnetic field (XFDTD). The theoretical analysis and simulation results show that the single partial discharge signal is the linear convolution of the partial discharge current signal and its corresponding impact response in GIS. The mixed partial discharge signals are the linear mixtures of every partial discharge signal.

Sign in / Sign up

Export Citation Format

Share Document