Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368654
Qi Zhang, Shi Qiu, Bihua Zhou
For analyzing wave propagation problems involving fine geometries, a novel hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) scheme is presented. Both the stability condition and numerical dispersion are theoretically analyzed. Numerical simulation indicates that the computational cost of this method to produce results with nearly identical accuracy to the existing HIE-FDTD method has been considerably saved.
{"title":"A hybrid implicit-explicit FDTD method with an intermediate field","authors":"Qi Zhang, Shi Qiu, Bihua Zhou","doi":"10.1109/CEEM.2015.7368654","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368654","url":null,"abstract":"For analyzing wave propagation problems involving fine geometries, a novel hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) scheme is presented. Both the stability condition and numerical dispersion are theoretically analyzed. Numerical simulation indicates that the computational cost of this method to produce results with nearly identical accuracy to the existing HIE-FDTD method has been considerably saved.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114883947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368672
Takahiro Yoshida
In recent years, wearable devices such as smartphones are widely used. However, in real environment wearable devices are used, ESD occurrence conditions are considered to be different from previous test methods because wearable devices are usually held by users in their body. In this study, we measured electrical stress induced by ESD from a charged human's fingertip to grounded objects on wearable devices held in charged human. From experimental results, shapes of the induced voltage waveforms, their durations, and amplitudes are quite different between each antenna. Especially, the durations of the induced voltage waveforms are changed between ten nanosecond order and hundred microsecond order. This means that electrical stress induced by ESD on wearable devices is very various and it depends on circuit structure.
{"title":"A study on electrical stress induced by electrostatic discharge on wearable devices","authors":"Takahiro Yoshida","doi":"10.1109/CEEM.2015.7368672","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368672","url":null,"abstract":"In recent years, wearable devices such as smartphones are widely used. However, in real environment wearable devices are used, ESD occurrence conditions are considered to be different from previous test methods because wearable devices are usually held by users in their body. In this study, we measured electrical stress induced by ESD from a charged human's fingertip to grounded objects on wearable devices held in charged human. From experimental results, shapes of the induced voltage waveforms, their durations, and amplitudes are quite different between each antenna. Especially, the durations of the induced voltage waveforms are changed between ten nanosecond order and hundred microsecond order. This means that electrical stress induced by ESD on wearable devices is very various and it depends on circuit structure.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126511614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368612
Xu Qingxiu, Xie Yanzhao
This paper applies the BLT equation into the calculation of transient response of the transmission line. The MTL we considered is a serial transmission line. Especially we did some analysis of transient response of MTL with discontinuous characteristic impedance.
{"title":"The transient response of discontinuous MTL based on BLT equation","authors":"Xu Qingxiu, Xie Yanzhao","doi":"10.1109/CEEM.2015.7368612","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368612","url":null,"abstract":"This paper applies the BLT equation into the calculation of transient response of the transmission line. The MTL we considered is a serial transmission line. Especially we did some analysis of transient response of MTL with discontinuous characteristic impedance.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121175737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368629
Liu Qing, Zhang Shihe, Suo Shuai
DC bias of power transformer can lead to distortion of excitation current, reactive power increasing and winding overheating, which will seriously affecting the safe operation of the power grid. To study DC bias is of great significance on the safe operation of transformer. Based on the Unified Magnetic Equivalent Circuit (UMEC) model of transformer, the excitation current and its harmonic when DC bias occurs had been analyzed by using PSCAD in this paper. The tolerance abilities of transformers with different structures under DC bias have been compared. With finite element software of Maxwell 2D, the model of transient electromagnetic field of single-phase transformer had been established to analyze the internal magnetic field variations in core and yoke under different DC currents. It can be seen that the leakage flux gradually increased with the saturation of the core, which lead to the increase of eddy-current loss. The highest temperature appeared in the junction of yoke and core. The influence of the transformer DC bias on the single-phase transformers is the most severe, and the least severe on 3-phase 3-limb transformers.
{"title":"Study of DC bias of power transformer based on UMEC model","authors":"Liu Qing, Zhang Shihe, Suo Shuai","doi":"10.1109/CEEM.2015.7368629","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368629","url":null,"abstract":"DC bias of power transformer can lead to distortion of excitation current, reactive power increasing and winding overheating, which will seriously affecting the safe operation of the power grid. To study DC bias is of great significance on the safe operation of transformer. Based on the Unified Magnetic Equivalent Circuit (UMEC) model of transformer, the excitation current and its harmonic when DC bias occurs had been analyzed by using PSCAD in this paper. The tolerance abilities of transformers with different structures under DC bias have been compared. With finite element software of Maxwell 2D, the model of transient electromagnetic field of single-phase transformer had been established to analyze the internal magnetic field variations in core and yoke under different DC currents. It can be seen that the leakage flux gradually increased with the saturation of the core, which lead to the increase of eddy-current loss. The highest temperature appeared in the junction of yoke and core. The influence of the transformer DC bias on the single-phase transformers is the most severe, and the least severe on 3-phase 3-limb transformers.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"274 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134087621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368670
L. Xiaoxiao, Ruan Fangming, Z. Junhua, T. Długosz, Xiao Wenjun, Xun Xiaoping, Y. Xiaohong, You Xiaojin, Jiang Yuanyuan, Chen Erpeng
Electrostatic Discharge (ESD) parameters of breakdown voltage, current, electric field, magnetic field, arc length, rise slope, shown distinctive variation because of effect from environment multiple factors of gas pressure, electrode speed to the target, temperature, humidity, type of gas. Measurement results have obviously low repeatability in non-contacted electrostatic discharge due to effect of surrounding multiple factors. Investigation of ESD parameter low repeatability were performed with methods of theory and experiment because of its much important theory and practice significance to understand ESD properties and to protect electronic systems from ESD harm. Discharge peak values variation caused by relative humidity were described and discussed. Analysis was given on possible mechanism of low repeatability of ESD parameters.
{"title":"Effect analysis of relative humidity on non-contacted Electrostatic Discharge","authors":"L. Xiaoxiao, Ruan Fangming, Z. Junhua, T. Długosz, Xiao Wenjun, Xun Xiaoping, Y. Xiaohong, You Xiaojin, Jiang Yuanyuan, Chen Erpeng","doi":"10.1109/CEEM.2015.7368670","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368670","url":null,"abstract":"Electrostatic Discharge (ESD) parameters of breakdown voltage, current, electric field, magnetic field, arc length, rise slope, shown distinctive variation because of effect from environment multiple factors of gas pressure, electrode speed to the target, temperature, humidity, type of gas. Measurement results have obviously low repeatability in non-contacted electrostatic discharge due to effect of surrounding multiple factors. Investigation of ESD parameter low repeatability were performed with methods of theory and experiment because of its much important theory and practice significance to understand ESD properties and to protect electronic systems from ESD harm. Discharge peak values variation caused by relative humidity were described and discussed. Analysis was given on possible mechanism of low repeatability of ESD parameters.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134241027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368611
Liu Yin-ting, Zhang Shu-yi, Shi Dan, Shen Yuan-mao, Gao You-gang
This paper presents a novel space-time adaptive processor with digital beam forming algorithm based on least mean squares (LMS) method. Furthermore, the omnidirectional optimization principle for the algorithm applied in satellite navigation field is introduced. The algorithm minimizes the deviation of the radiation pattern due to the edge effect of asymmetric substrate in the miniaturization design of antennas. The anti-jamming performance of the introduced algorithm is verified through the experiment of radiation pattern, satellite signal receiving experiment and anti-jamming experiment.
{"title":"Anti-jamming space-time processor with digital beamformer for satellite navigation","authors":"Liu Yin-ting, Zhang Shu-yi, Shi Dan, Shen Yuan-mao, Gao You-gang","doi":"10.1109/CEEM.2015.7368611","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368611","url":null,"abstract":"This paper presents a novel space-time adaptive processor with digital beam forming algorithm based on least mean squares (LMS) method. Furthermore, the omnidirectional optimization principle for the algorithm applied in satellite navigation field is introduced. The algorithm minimizes the deviation of the radiation pattern due to the edge effect of asymmetric substrate in the miniaturization design of antennas. The anti-jamming performance of the introduced algorithm is verified through the experiment of radiation pattern, satellite signal receiving experiment and anti-jamming experiment.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132767955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368708
Ding Peng-fei, Kou Zheng, Han Yue-qi, Gao Wei-qi
A non-hydrostatic mesoscale model Meso-NH is used to investigate the temporal evolution of thunderstorm charge structures. The thunderstorm happened on Nanjing of China. The used parameterizations of non-inductive charging was SAP98. Idealized cloud case was simulated here. The results indicate that the magnitude of the charges was increased and the height of location was lifted with the development of thunderstorm. In the early stage, the simulated thunderstorm charge structures are positive dipole. When the vertical velocity weaken, charge structures switch to four-layer and the magnitude of the charges was decreased. Positive and negative coexist in the height where the isothermal layer range from - 50 to 0 °C. In the dissipation stage of thunderstorm, the structure is also positive dipole. As major charged carriers, snow charge positive and graupel charge negative. The charge that rain carries has a great effect on charge density distribution below 0 °C isothermal layer at mature stage.
{"title":"The temporal evolution of charge structure in a simulated thunderstorm","authors":"Ding Peng-fei, Kou Zheng, Han Yue-qi, Gao Wei-qi","doi":"10.1109/CEEM.2015.7368708","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368708","url":null,"abstract":"A non-hydrostatic mesoscale model Meso-NH is used to investigate the temporal evolution of thunderstorm charge structures. The thunderstorm happened on Nanjing of China. The used parameterizations of non-inductive charging was SAP98. Idealized cloud case was simulated here. The results indicate that the magnitude of the charges was increased and the height of location was lifted with the development of thunderstorm. In the early stage, the simulated thunderstorm charge structures are positive dipole. When the vertical velocity weaken, charge structures switch to four-layer and the magnitude of the charges was decreased. Positive and negative coexist in the height where the isothermal layer range from - 50 to 0 °C. In the dissipation stage of thunderstorm, the structure is also positive dipole. As major charged carriers, snow charge positive and graupel charge negative. The charge that rain carries has a great effect on charge density distribution below 0 °C isothermal layer at mature stage.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116018220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368711
S. Liyuan, Gao Cheng, Guo Fei, Ma Yao
In the aircraft lightning indirect effects test, the lightning attachment points are represented by the current generator and return conductor attachments to the aircraft. The airframe and return conductors form a complex non-uniform multi-conductor transmission line. In order to analyze the distributed parameters of the coaxial return conductor system, the simplified model is built in the work to study the change rule of distributed capacitance with different return conductor arrangement. Besides, a lightning injection test model with the aircraft T50 is built, its distributed parameters are calculated by the electromagnetic simulation software FEKO, and then its characteristic impedances in different return conductor arrangements are determined. Thus, some useful rules are provided for characteristic impedance matching in aircraft lightning indirect effect test, and lay a foundation for further research on return conductor configuration.
{"title":"Simulation analysis on the distributed capacitance of aircraft return conductor system","authors":"S. Liyuan, Gao Cheng, Guo Fei, Ma Yao","doi":"10.1109/CEEM.2015.7368711","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368711","url":null,"abstract":"In the aircraft lightning indirect effects test, the lightning attachment points are represented by the current generator and return conductor attachments to the aircraft. The airframe and return conductors form a complex non-uniform multi-conductor transmission line. In order to analyze the distributed parameters of the coaxial return conductor system, the simplified model is built in the work to study the change rule of distributed capacitance with different return conductor arrangement. Besides, a lightning injection test model with the aircraft T50 is built, its distributed parameters are calculated by the electromagnetic simulation software FEKO, and then its characteristic impedances in different return conductor arrangements are determined. Thus, some useful rules are provided for characteristic impedance matching in aircraft lightning indirect effect test, and lay a foundation for further research on return conductor configuration.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122818358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368615
Jun Guo, Yan-zhao Xie
The distributed analytical representation and iterative technique (DARIT) has been proposed for the calculation of electromagnetic pulse (EMP) radiated field coupling to multi-conductor transmission lines (MTLs). At first, this technique adopts the Jacobi iteration scheme (Jacobi-DARIT-field) or the Gauss-Seidel iteration scheme (Seidel-DARIT-field). More recently, based on these two methods, the JOR-DARIT-field and SOR-DARIT-field methods which adopt the over-relaxation iterative methods have been developed as well. This paper compares these four methods from the points of view of the accuracy and convergence speed, etc.
{"title":"Analyzation of EMP coupling to multi-conductor transmission lines based on the over-relaxation iterative methods","authors":"Jun Guo, Yan-zhao Xie","doi":"10.1109/CEEM.2015.7368615","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368615","url":null,"abstract":"The distributed analytical representation and iterative technique (DARIT) has been proposed for the calculation of electromagnetic pulse (EMP) radiated field coupling to multi-conductor transmission lines (MTLs). At first, this technique adopts the Jacobi iteration scheme (Jacobi-DARIT-field) or the Gauss-Seidel iteration scheme (Seidel-DARIT-field). More recently, based on these two methods, the JOR-DARIT-field and SOR-DARIT-field methods which adopt the over-relaxation iterative methods have been developed as well. This paper compares these four methods from the points of view of the accuracy and convergence speed, etc.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132135072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368653
Chen Liwei, T. Zhiliang, Cui Lidong
LMS Algorithm floating point arithmetic in hardware implementation system takes up more resources, hardware running slow and can not meet the real-time requirements of the system. So we need fixed-point arithmetic for LMS algorithm. Doing algorithm modeling with System Generator in Simulink environment will be implement in ISE and MATLAB. We can make adjustments and do the corresponding design and simulation for fixed-point methods . Simulation results show that fixed-point arithmetic module can cellation noise well. But compared with floating-point arithmetic modules, there are a little errors. LMS algorithm module can achieve LMS algorithm effectively. In the Simulink environment ,it lay a good foundation for complex system fixed-point implementation.
{"title":"LMS algorithm fixed-point modeling designated based on System Generator modules","authors":"Chen Liwei, T. Zhiliang, Cui Lidong","doi":"10.1109/CEEM.2015.7368653","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368653","url":null,"abstract":"LMS Algorithm floating point arithmetic in hardware implementation system takes up more resources, hardware running slow and can not meet the real-time requirements of the system. So we need fixed-point arithmetic for LMS algorithm. Doing algorithm modeling with System Generator in Simulink environment will be implement in ISE and MATLAB. We can make adjustments and do the corresponding design and simulation for fixed-point methods . Simulation results show that fixed-point arithmetic module can cellation noise well. But compared with floating-point arithmetic modules, there are a little errors. LMS algorithm module can achieve LMS algorithm effectively. In the Simulink environment ,it lay a good foundation for complex system fixed-point implementation.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130586461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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