Pub Date : 1978-06-20DOI: 10.1109/ISEMC.1978.7566860
K. Casey
In this paper we consider a general electro magnetic characterization of advanced composite panels of fiber-reinforced epoxy with or without a bonded-mesh screen embedded in one surface. It is shown that over the frequency range characteristic of the nuclear EMP or lightning, composite panels whose fibers do not possess a preferred orientation may be modeled as uniaxially anisotropic conductive or dielectric media, and that the bonded-mesh screen may be modeled as an equivalent sheet impedance operator which has both resistive and reactive components and which is spatially dispersive. We also present the results of time-domain shielding calculations involv ing planar composite panels and cylindrical shells of advanced composites. It is shown that, geometrical considerations aside, a graphite-epoxy composite has a low-pass or integrating characteristic, while a screened poorly conductive composite has a high-pass or differentiating characteristic. Closed regions shielded by composites tend to act as time domain integrators of signals passing from the exterior to the interior in the frequency range below the inter nal cavity resonances. Thus the total transfer characteristic between the fields outside and inside a closed region may be understood as approximately representing attenuation and a double integration for conductive (e.g., graphite-epoxy) composites, or simply attenuation for screened nonconductive com posites .
{"title":"Advanced Composite Materials and Electromagnetic Shielding","authors":"K. Casey","doi":"10.1109/ISEMC.1978.7566860","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566860","url":null,"abstract":"In this paper we consider a general electro magnetic characterization of advanced composite panels of fiber-reinforced epoxy with or without a bonded-mesh screen embedded in one surface. It is shown that over the frequency range characteristic of the nuclear EMP or lightning, composite panels whose fibers do not possess a preferred orientation may be modeled as uniaxially anisotropic conductive or dielectric media, and that the bonded-mesh screen may be modeled as an equivalent sheet impedance operator which has both resistive and reactive components and which is spatially dispersive. We also present the results of time-domain shielding calculations involv ing planar composite panels and cylindrical shells of advanced composites. It is shown that, geometrical considerations aside, a graphite-epoxy composite has a low-pass or integrating characteristic, while a screened poorly conductive composite has a high-pass or differentiating characteristic. Closed regions shielded by composites tend to act as time domain integrators of signals passing from the exterior to the interior in the frequency range below the inter nal cavity resonances. Thus the total transfer characteristic between the fields outside and inside a closed region may be understood as approximately representing attenuation and a double integration for conductive (e.g., graphite-epoxy) composites, or simply attenuation for screened nonconductive com posites .","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125821257","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 : 1978-06-20DOI: 10.1109/ISEMC.1978.7566822
T. Dvorak
{"title":"Compatibility of Spread-Spectrum Signals with Narrowband-FM Receivers in VHF Mobile Networks","authors":"T. Dvorak","doi":"10.1109/ISEMC.1978.7566822","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566822","url":null,"abstract":"","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134296989","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 : 1978-06-20DOI: 10.1109/ISEMC.1978.7566819
L. Berry
Citizen's Band (CB) radio channels are already badly congested in large metropolitan areas, and the number of licensed sets is increasing several million per year. In addition, interference from skywave propagated CB signals during the three years near the peak of the next solar cycle (two to four years from now) will probably significantly decrease the opera tional range of users in less congested parts of the country. 1 ' 2 As a result, the Federal Communications Commission (FCC) has been studying the possibility of establishing a new Personal Radio Service to supplement the Citizen's Band service.
{"title":"Technical Tradeoffs for Spectrum Efficiency in a Personal Radio Service","authors":"L. Berry","doi":"10.1109/ISEMC.1978.7566819","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566819","url":null,"abstract":"Citizen's Band (CB) radio channels are already badly congested in large metropolitan areas, and the number of licensed sets is increasing several million per year. In addition, interference from skywave propagated CB signals during the three years near the peak of the next solar cycle (two to four years from now) will probably significantly decrease the opera tional range of users in less congested parts of the country. 1 ' 2 As a result, the Federal Communications Commission (FCC) has been studying the possibility of establishing a new Personal Radio Service to supplement the Citizen's Band service.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123016456","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 : 1978-06-20DOI: 10.1109/ISEMC.1978.7566825
C. Paul
The prediction of crosstalk in ribbon cables is in vestigated. Experimental results are obtained for a 20 wire ribbon cable and compared to the predictions of the multiconductor transmission line (MTL) model. Based on the experimental configuration tested, it would appear that accurate predictions of crosstalk can be achieved in controlled characteristic cables such as these. The prediction accuracies are typically with + 1 dB for frequencies such that the line is electrically short and + 6 dB for frequencies such that the line is electrically long. It was found that the parasitic wires in the cable can have a significant effect (as much as 40 dB) on the coupling between a generator circuit and a receptor cir cuit in the cable. Therefore to achieve accurate pre dictions in ribbon cables, one must consider the inter actions between all wires in the cable. The wire in sulation evidently cannot be ignored for frequencies such that the line is electrically long. The impedance of the reference wire cannot be ignored for low frequen cies where the common impedance coupling dominates the electromagnetic field coupling.
{"title":"Prediction of Crosstalk in Ribbon Cables","authors":"C. Paul","doi":"10.1109/ISEMC.1978.7566825","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566825","url":null,"abstract":"The prediction of crosstalk in ribbon cables is in vestigated. Experimental results are obtained for a 20 wire ribbon cable and compared to the predictions of the multiconductor transmission line (MTL) model. Based on the experimental configuration tested, it would appear that accurate predictions of crosstalk can be achieved in controlled characteristic cables such as these. The prediction accuracies are typically with + 1 dB for frequencies such that the line is electrically short and + 6 dB for frequencies such that the line is electrically long. It was found that the parasitic wires in the cable can have a significant effect (as much as 40 dB) on the coupling between a generator circuit and a receptor cir cuit in the cable. Therefore to achieve accurate pre dictions in ribbon cables, one must consider the inter actions between all wires in the cable. The wire in sulation evidently cannot be ignored for frequencies such that the line is electrically long. The impedance of the reference wire cannot be ignored for low frequen cies where the common impedance coupling dominates the electromagnetic field coupling.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121962658","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 : 1978-06-01DOI: 10.1109/ISEMC.1978.7566842
D. R. Kerns, E. Bronaugh
The d e s i g n , a p p r o a c h , d e v e l o p m e n t , and t e s t i n g o f an e l e c t r o m a g n e t i c f i e l d m e a su r in g sy s t e m c a p a b l e o f r e s p o n d i n g t o b o th t h e peak and a v e r a g e EM f i e l d i n t e n s i t y o f h i g h s t r e n g t h f i e l d s i s d i s c u s s e d . The s y s t e m p r o b e s a r e s m a l l , c o n d u c t i v e l y i s o l a t e d , and c o v e r t h e ra n g e from 10 MHz t o 18 GHz. The f i e l d i n t e n s i t y i s i n d i c a t e d on an a u t o r a n g e d m o n i t o r 9m away.
对一个可持续发展系统的设计、规划、实施和评估、和 t e s t i n g o an e l e c t r o m a g n e t i c f i e l d m e a su r in g sy s t e m c a p a b l e o r e s o n d i n g t o b o th t h e peak and a v e r a g e EM f i e l d i n t e n s i t y o f h i g h s t r e n g t h e f i e l d s i s s c u s s e d .它的频率范围从 10 MHz 到 18 GHz。在 9 米开外的一个大功率发射器上进行发射。
{"title":"A Non-Obtrusive Remote Indicating Instrument for Probing EM Fields Having Potentially Hazardous Levels","authors":"D. R. Kerns, E. Bronaugh","doi":"10.1109/ISEMC.1978.7566842","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566842","url":null,"abstract":"The d e s i g n , a p p r o a c h , d e v e l o p m e n t , and t e s t i n g o f an e l e c t r o m a g n e t i c f i e l d m e a su r in g sy s t e m c a p a b l e o f r e s p o n d i n g t o b o th t h e peak and a v e r a g e EM f i e l d i n t e n s i t y o f h i g h s t r e n g t h f i e l d s i s d i s c u s s e d . The s y s t e m p r o b e s a r e s m a l l , c o n d u c t i v e l y i s o l a t e d , and c o v e r t h e ra n g e from 10 MHz t o 18 GHz. The f i e l d i n t e n s i t y i s i n d i c a t e d on an a u t o r a n g e d m o n i t o r 9m away.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132373379","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 : 1978-06-01DOI: 10.1109/ISEMC.1978.7566847
G. Hagn
The 9 f t rod antenna p r o v id e s a lower r e c e iv in g system th r e sh o ld than a 4 1 in rod, and th e r e f o r e i t i s a d e s i r a b l e c h o ic e f o r v a r io u s e le c tr o m a g n e t ic com p a t i b i l i t y (EMC) measurements such a s environm ental n o i s e l e v e l su r v e y s . The antenna f a c t o r provided by th e m anufacturer i s f r e q u e n t ly th e i n s e r t i o n l o s s o f the antenna c o u p le r measured w ith a dummy antenna in th e la b o r a to ry r a th e r than the antenna f a c t o r as de f in e d by the IEEE (which in c lu d e s th e antenna e f f e c t i v e l e n g t h ) . The a c t u a l antenna f a c t o r f o r any g iv e n measurement depends upon th e antenna i n s t a l l a t i o n . The 9 f t rod antennas have been used w h ile mounted on aluminum ground p la n es p la ced on th e e a rth and, more r e c e n t ly , w h i le i n s t a l l e d on the to p s o f m e ta l-r o o fe d v e h i c l e s . T h is paper summarizes some measured antenna f a c t o r s fo r the 9 f t rod fo r v e r t i c a l l y p o la r iz e d ground waves fo r both o f th e se con f i g u r a t io n s ; and com parisons w ith the m anu factu rer's v a lu e s a re g iv e n . Example inp ut impedance da ta are a l s o g iv e n f o r each type o f i n s t a l l a t i o n . F in a l l y , some comments a re o f f e r e d on th e e le v a t io n p la n e d i r e c t i v i t y p a t te r n s o f veh ic le -m o u n ted 9 f t r o d s , on th e e f f e c t s o f d i f f e r e n t ty p es o f ground, and on th e e f f e c t s o f p eo p le s ta n d in g near th e antenna.
The 9 f t rod天线p r或s id和下r和c和g系统第四th和丹丹ld sh或4 1罗德,和th和r或r s t d和d r a b和c h或i v和f o r r我u s和rs c o m n和t ic com - a t b l i t y (EMC) measurements such a s environm环境n或s和l和v r和l的v和y s。The f拿c t o r天线由th和m anufacturer i s r和u和f 14.1 th r a号和s和n l或s f The u c或p r measured w ith天线天线dummy th和b或r (ry than The天线th和r f中c t o r - c和d by The IEEE(该lu d和s th和天线和f - f和c v t l和n g t (h)。a c t u a l a c t o r r a f或r r a f或r或r的任何度量都取决于它的大小和它的大小，它的大小取决于它的大小，它的大小取决于它的大小，它的大小取决于它的大小，它的大小取决于它的大小，它的大小取决于它的大小，它的大小取决于它的大小，它的大小取决于它的大小，它的大小取决于它的大小，它的大小取决于它的大小，它的大小取决于它的大小。The 9 f t rod antennas have的used w h lei骑警on aluminum ground p n th和edc es p和r和c rth and、more 14.1, w h i s t a l e d on The p s或f m和l-r或fe d y和h i c l和s。T h is summarizes论文measured天线的f a r i c T s in the 9 f T罗德fo r v和T - c a l y p或冷水和d地面waves fo r拍或f th - f与g r u n s;我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们，我的朋友们。举例说明每一种类型的承诺。F在a l y,剧情comments a e或F F和r和d th和v a n p n和r和t i c t y p a s r t或F ted 9号veh ic -或阿拉伯联合酋长国F d t r或s - th e和F和c t或F r和d和F ty p es或地面,和th和F F F F和c t s或eo p号s d g) th和天线。
{"title":"Calibration of 9-ft Rod Antenna for MF and HF EMC Measurements","authors":"G. Hagn","doi":"10.1109/ISEMC.1978.7566847","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566847","url":null,"abstract":"The 9 f t rod antenna p r o v id e s a lower r e c e iv in g system th r e sh o ld than a 4 1 in rod, and th e r e f o r e i t i s a d e s i r a b l e c h o ic e f o r v a r io u s e le c tr o m a g n e t ic com p a t i b i l i t y (EMC) measurements such a s environm ental n o i s e l e v e l su r v e y s . The antenna f a c t o r provided by th e m anufacturer i s f r e q u e n t ly th e i n s e r t i o n l o s s o f the antenna c o u p le r measured w ith a dummy antenna in th e la b o r a to ry r a th e r than the antenna f a c t o r as de f in e d by the IEEE (which in c lu d e s th e antenna e f f e c t i v e l e n g t h ) . The a c t u a l antenna f a c t o r f o r any g iv e n measurement depends upon th e antenna i n s t a l l a t i o n . The 9 f t rod antennas have been used w h ile mounted on aluminum ground p la n es p la ced on th e e a rth and, more r e c e n t ly , w h i le i n s t a l l e d on the to p s o f m e ta l-r o o fe d v e h i c l e s . T h is paper summarizes some measured antenna f a c t o r s fo r the 9 f t rod fo r v e r t i c a l l y p o la r iz e d ground waves fo r both o f th e se con f i g u r a t io n s ; and com parisons w ith the m anu factu rer's v a lu e s a re g iv e n . Example inp ut impedance da ta are a l s o g iv e n f o r each type o f i n s t a l l a t i o n . F in a l l y , some comments a re o f f e r e d on th e e le v a t io n p la n e d i r e c t i v i t y p a t te r n s o f veh ic le -m o u n ted 9 f t r o d s , on th e e f f e c t s o f d i f f e r e n t ty p es o f ground, and on th e e f f e c t s o f p eo p le s ta n d in g near th e antenna.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115382295","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 : 1978-06-01DOI: 10.1109/ISEMC.1978.7566831
R. Richardson
This paper discusses the rectification response exhibited by low frequency bipolar transistors when microwave energy is injected. A circuit analysis model for calculating low frequency small signal response to microwave energy is discussed and applied in analyzing the behavior of a 741 op-amp. non-uniformity of gain across the emitter. In an emitter follower circuit such as that which appears at the 741 input, the principle circuit response is due to the emitter-base offset voltage, which may be calculated from knowledge of device material and geometrical factors. Quantitative theoretical calculations are performed to relate the response of a small NPN transistor similar to that used in a 741 op-amp to its material and geometrical parameters.
{"title":"Modeling of Microwave Rectification RFI Effects in Low Frequency Circuitry+","authors":"R. Richardson","doi":"10.1109/ISEMC.1978.7566831","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566831","url":null,"abstract":"This paper discusses the rectification response exhibited by low frequency bipolar transistors when microwave energy is injected. A circuit analysis model for calculating low frequency small signal response to microwave energy is discussed and applied in analyzing the behavior of a 741 op-amp. non-uniformity of gain across the emitter. In an emitter follower circuit such as that which appears at the 741 input, the principle circuit response is due to the emitter-base offset voltage, which may be calculated from knowledge of device material and geometrical factors. Quantitative theoretical calculations are performed to relate the response of a small NPN transistor similar to that used in a 741 op-amp to its material and geometrical parameters.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114744165","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 : 1978-06-01DOI: 10.1109/ISEMC.1978.7566873
Lowell C. Minor, Francis M. Koziuk, J. Rockway, S.T. Li
A computer program (PECAL) is described which pre dicts the performance of multiple EM communication equipments in the 2 to 400 MHz band when placed in a Navy shipboard (single-ship) configuration. A com bination of linear and nonlinear interference phenom ena are analyzed. The scope of the program is limited to the treatment of interference mechanisms involving radiated, antenna coupled signals and multicoupler crosstalk signals. The EMC performance measures are expressed in terms of statistics, as are many of the model parameters used in the interference prediction equations.
{"title":"PECAL: A New Computer Program for the EMC Performance Evaluation of Communication Systems in a Cosite Configuration","authors":"Lowell C. Minor, Francis M. Koziuk, J. Rockway, S.T. Li","doi":"10.1109/ISEMC.1978.7566873","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566873","url":null,"abstract":"A computer program (PECAL) is described which pre dicts the performance of multiple EM communication equipments in the 2 to 400 MHz band when placed in a Navy shipboard (single-ship) configuration. A com bination of linear and nonlinear interference phenom ena are analyzed. The scope of the program is limited to the treatment of interference mechanisms involving radiated, antenna coupled signals and multicoupler crosstalk signals. The EMC performance measures are expressed in terms of statistics, as are many of the model parameters used in the interference prediction equations.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115130110","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 : 1978-06-01DOI: 10.1109/ISEMC.1978.7566861
R. Perala, K. M. Lee, R. Cook
In t h i s p a p e r , r e s u l t s a r e p r e s e n t e d f o r n u c l e a r EMP c o u p l i n g t o an Advanced D e s ig n C om posi te A i r c r a f t (ADCA). The ADCA i s a c o n c e p t u a l a i r c r a f t w hose s k i n i s f a b r i c a t e d o u t o f s i g n i f i c a n t p o r t i o n s o f g r a p h i t e e p oxy compo s i t e m a t e r i a l . Numer ical r e s u l t s a r e p r e s e n t e d f o r in d uc e d s u r f a c e c u r r e n t s and c h a r g e s ( e x t e r n a l c o u p l i n g ) and f o r s k i n d i f f u s i o n i n d u c e d c u r r e n t s and v o l t a g e s on t y p i c a l c a b l e runs i n s i d e t h e a i r c r a f t ( i n t e r n a l c o u p l i n g ) . When t h e s e i n t e r n a l c o u p l i n g r e s u l t s a r e com pared t o t h o s e w h ich have been e x p e r i m e n t a l l y o b s e r v e d on m e t a l l i c a i r c r a f t , ( f o r w h ich s k i n d i f f u s i o n i s n o t i m p o r t a n t ) , one c o n c l u d e s t h a t t h e s k i n d i f f u s i o n in d uc e d l e v e l s a r e u s u a l l y s m a l l e r than t h o s e c a u s e d by a p e r t u r e s . How ever , t h e a v a i l a b l e power in t h e d i f f u s i o n in d uc e d t r a n s i e n t s i s s u f f i c i e n t by i t s e l f t o p o s s i b l y c a u s e d e v i c e damage o r c i r c u i t u p s e t . C a l c u l a t i o n s a r e a l s o done w i t h a h a r d e n in g f i x w hich c o n s i s t s o f a 6 m i l t h i c k aluminum f l a m e s p r a y c o a t i n g o v e r t h e e n t i r e a i r c r a f t . T h i s f i x p r o v i d e s more than 40 dB a t t e n u a t i o n and t h e r e b y r e d u c e s t h e d i f f u s i o n i n d u c e d t r a n s i e n t s t o a s a f e l e v e l .
在这一项目中，我们将对先进的环境管理模式（ADCA）进行研究。ADCA是一种可用于气体燃料和氧气复合材料的先进技术。数字式反应器（e x t e r n a l c o u p l i n g ）和反应器（s k i n d当出现这些情况时，应立即停止运行。当这些 "正常运行 "与 "已正常运行 "进行比较时，就会发现 "正常运行 "与 "已正常运行 "之间的差异、人们会认为，"(在这种情况下)"(s k i n d i f u s i o n)比"(a p e r t u r e s)"(s k i n d i f u s i o n)的"(s k i n d i f u s i o n)"(s i n d u c e d l e v e l s)更有效。然而，这也是一种通过对自然环境的保护来提高自然生态能力的方法。在 6 m i l t h i c k f l a m e s p r a y c o a t i n g o v e r t h i r e a i r c r a f t 中 ， C a l c u l a t i o n s a l s o done w i t h a r d e n in g f i x w h i c h c o n s i s t s o f 6 m i l t h i c k f l a m e s p r a y c o a t i n g o v e r t h i r e a i r c r a f t .这 些 铝 制 物 可 以 减 少 40 多 分 贝 的 噪 声 。
{"title":"EMP Coupling to a Composite Aircraft","authors":"R. Perala, K. M. Lee, R. Cook","doi":"10.1109/ISEMC.1978.7566861","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566861","url":null,"abstract":"In t h i s p a p e r , r e s u l t s a r e p r e s e n t e d f o r n u c l e a r EMP c o u p l i n g t o an Advanced D e s ig n C om posi te A i r c r a f t (ADCA). The ADCA i s a c o n c e p t u a l a i r c r a f t w hose s k i n i s f a b r i c a t e d o u t o f s i g n i f i c a n t p o r t i o n s o f g r a p h i t e e p oxy compo s i t e m a t e r i a l . Numer ical r e s u l t s a r e p r e s e n t e d f o r in d uc e d s u r f a c e c u r r e n t s and c h a r g e s ( e x t e r n a l c o u p l i n g ) and f o r s k i n d i f f u s i o n i n d u c e d c u r r e n t s and v o l t a g e s on t y p i c a l c a b l e runs i n s i d e t h e a i r c r a f t ( i n t e r n a l c o u p l i n g ) . When t h e s e i n t e r n a l c o u p l i n g r e s u l t s a r e com pared t o t h o s e w h ich have been e x p e r i m e n t a l l y o b s e r v e d on m e t a l l i c a i r c r a f t , ( f o r w h ich s k i n d i f f u s i o n i s n o t i m p o r t a n t ) , one c o n c l u d e s t h a t t h e s k i n d i f f u s i o n in d uc e d l e v e l s a r e u s u a l l y s m a l l e r than t h o s e c a u s e d by a p e r t u r e s . How ever , t h e a v a i l a b l e power in t h e d i f f u s i o n in d uc e d t r a n s i e n t s i s s u f f i c i e n t by i t s e l f t o p o s s i b l y c a u s e d e v i c e damage o r c i r c u i t u p s e t . C a l c u l a t i o n s a r e a l s o done w i t h a h a r d e n in g f i x w hich c o n s i s t s o f a 6 m i l t h i c k aluminum f l a m e s p r a y c o a t i n g o v e r t h e e n t i r e a i r c r a f t . T h i s f i x p r o v i d e s more than 40 dB a t t e n u a t i o n and t h e r e b y r e d u c e s t h e d i f f u s i o n i n d u c e d t r a n s i e n t s t o a s a f e l e v e l .","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127125445","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 : 1978-06-01DOI: 10.1109/ISEMC.1978.7566857
C. Baum
The mathematical description of the response of a complex system such as an aircraft, a building, etc., to a general electromagnetic stimulus is a problem of exceeding difficulty. High confidence prediction of the signals at the various failure ports (normally pins) is in general beyond the state of the art. Related to the problem of failure-port signal predic tion there is the problem of reducing such signals to acceptable levels (i.e., hardening). This problem has serious implications for hardening systems to the effects of the nuclear electromagnetic pulse (EMP) as well as other electromagnetic environments.
{"title":"The Use of Topology as a Means of Subdividing Complex Electromagnetic Scatterers and Controlling the Entry of Electromagnetic Energy","authors":"C. Baum","doi":"10.1109/ISEMC.1978.7566857","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566857","url":null,"abstract":"The mathematical description of the response of a complex system such as an aircraft, a building, etc., to a general electromagnetic stimulus is a problem of exceeding difficulty. High confidence prediction of the signals at the various failure ports (normally pins) is in general beyond the state of the art. Related to the problem of failure-port signal predic tion there is the problem of reducing such signals to acceptable levels (i.e., hardening). This problem has serious implications for hardening systems to the effects of the nuclear electromagnetic pulse (EMP) as well as other electromagnetic environments.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130559984","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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