Pub Date : 1991-05-20DOI: 10.1109/NAECON.1991.165810
S. E. Reed, J. W. Berthold
The authors present the design rationale for a total pressure fiber optic transducer under development for planned flight test. Pressure sealing problems for absolute pressure transduction are discussed. Information is given on the microbend fiber optic sensor approach used to measure diaphragm deflection, and requirements for microbend sensor thermal compensation. Wavelength division multiplexing (WDM) approaches are described to self-reference the fiber optic sensors so that the transducer output is insensitive to interconnect cable bending and connector mating/demating. Requirements and constraints imposed by the WDM methods are discussed, along with the impact on overall transducer operation. Preliminary performance data are presented on a prototype transducer incorporating the features necessary to achieve a stable, repeatable, and accurate output.<>
{"title":"Absolute fiber optic pressure transducer for aircraft air data measurement","authors":"S. E. Reed, J. W. Berthold","doi":"10.1109/NAECON.1991.165810","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165810","url":null,"abstract":"The authors present the design rationale for a total pressure fiber optic transducer under development for planned flight test. Pressure sealing problems for absolute pressure transduction are discussed. Information is given on the microbend fiber optic sensor approach used to measure diaphragm deflection, and requirements for microbend sensor thermal compensation. Wavelength division multiplexing (WDM) approaches are described to self-reference the fiber optic sensors so that the transducer output is insensitive to interconnect cable bending and connector mating/demating. Requirements and constraints imposed by the WDM methods are discussed, along with the impact on overall transducer operation. Preliminary performance data are presented on a prototype transducer incorporating the features necessary to achieve a stable, repeatable, and accurate output.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126640169","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165751
B. Worger, J. McDonald, B. Schaefer
Discusses the application of the trusted computer system evaluation criteria (TCSEC) and the trusted network interpretation (TNI) to closed network systems (systems which are entirely contained within a single secure enclosure such as a tank, ship, or aircraft). The authors discuss various COMPUSEC (computer security) principles (focused in the B division, but not specific to a class) and their applicability to closed systems. They also make suggestions on how to use unique properties of the closed systems to reduce the impact of incorporating COMPUSEC principles into these systems.<>
{"title":"Apply COMPUSEC principles to closed network systems","authors":"B. Worger, J. McDonald, B. Schaefer","doi":"10.1109/NAECON.1991.165751","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165751","url":null,"abstract":"Discusses the application of the trusted computer system evaluation criteria (TCSEC) and the trusted network interpretation (TNI) to closed network systems (systems which are entirely contained within a single secure enclosure such as a tank, ship, or aircraft). The authors discuss various COMPUSEC (computer security) principles (focused in the B division, but not specific to a class) and their applicability to closed systems. They also make suggestions on how to use unique properties of the closed systems to reduce the impact of incorporating COMPUSEC principles into these systems.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"449 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125798763","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165752
R.L. Jones, P. Hayes, A. M. Andrews, S. Som, J. Stoughton, R. Mielke
The algorithm to architecture mapping model (ATAMM) is a Petri-net-based model which provides a strategy for periodic execution of a class of real-time algorithms on multicomputer data flow architectures. The problem domain of particular interest is the execution of large-grained, decision-free algorithms on homogeneous processing elements. Design techniques are discussed and performance measurements are defined. A multiple-graph execution strategy is shown to increase throughput performance. It is shown that the same increase in performance is attainable with minor modifications to the existing ATAMM.<>
{"title":"Enhanced ATAMM for increased throughput performance of multicomputer data flow architectures","authors":"R.L. Jones, P. Hayes, A. M. Andrews, S. Som, J. Stoughton, R. Mielke","doi":"10.1109/NAECON.1991.165752","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165752","url":null,"abstract":"The algorithm to architecture mapping model (ATAMM) is a Petri-net-based model which provides a strategy for periodic execution of a class of real-time algorithms on multicomputer data flow architectures. The problem domain of particular interest is the execution of large-grained, decision-free algorithms on homogeneous processing elements. Design techniques are discussed and performance measurements are defined. A multiple-graph execution strategy is shown to increase throughput performance. It is shown that the same increase in performance is attainable with minor modifications to the existing ATAMM.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121872756","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165797
D. Biezad
Attitude control of aircraft using only the throttles is investigated. The long time constants of both the engines and the aircraft dynamics, together with the coupling between longitudinal and lateral aircraft modes, make piloted flight with failed control surfaces hazardous, especially when trying to land. The author documents the results of in-flight operation using simulated failed flight controls and ground simulations of piloted propulsive-only control to touchdown. Augmentation control laws to assist the pilot are described using both optimal control and classical feedback methods. Piloted simulation using augmentation shows that simple and effective augmented control can be achieved in a wide variety of failed configurations.<>
{"title":"The propulsive-only flight control problem","authors":"D. Biezad","doi":"10.1109/NAECON.1991.165797","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165797","url":null,"abstract":"Attitude control of aircraft using only the throttles is investigated. The long time constants of both the engines and the aircraft dynamics, together with the coupling between longitudinal and lateral aircraft modes, make piloted flight with failed control surfaces hazardous, especially when trying to land. The author documents the results of in-flight operation using simulated failed flight controls and ground simulations of piloted propulsive-only control to touchdown. Augmentation control laws to assist the pilot are described using both optimal control and classical feedback methods. Piloted simulation using augmentation shows that simple and effective augmented control can be achieved in a wide variety of failed configurations.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122073662","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165747
D. B. Hamlin
As future avionic system architectures and concepts become increasingly dependent on distributed modular technology, the proliferation of the emerging Joint Integrated Avionics Working Group (JIAWG)-specified high speed data bus (HSDB) into every subsystem is likely. Unisys perceives a need for a HSDB chip set that can be integrated into the numerous non-common module applications that are prevalent in the platforms that will support the HSDB. The author details the features of the chip set that Unisys has developed that can be incorporated into various avionic architectures to provide the JIAWG standard fiber-optic data bus. Improvements being contemplated for the HSDB chip set and two potential implementations are described.<>
{"title":"The Unisys implemented, JIAWG compliant, linear, token-passing HSDB chip set description","authors":"D. B. Hamlin","doi":"10.1109/NAECON.1991.165747","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165747","url":null,"abstract":"As future avionic system architectures and concepts become increasingly dependent on distributed modular technology, the proliferation of the emerging Joint Integrated Avionics Working Group (JIAWG)-specified high speed data bus (HSDB) into every subsystem is likely. Unisys perceives a need for a HSDB chip set that can be integrated into the numerous non-common module applications that are prevalent in the platforms that will support the HSDB. The author details the features of the chip set that Unisys has developed that can be incorporated into various avionic architectures to provide the JIAWG standard fiber-optic data bus. Improvements being contemplated for the HSDB chip set and two potential implementations are described.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126331223","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165750
M. Barwick, M. Midkiff, D. Seals
An avionics cooling system has been developed that circulates fluid through the structural frame of its SEM-E modules. The liquid flow-through (LFT) module frame is only 100 mils thick, yet is capable of maintaining low junction and surface temperatures for modules dissipating in excess of 200 W. The module form/factor is compatible with existing SEM-E circuit board formats and connectors and features toolless, dripless, quick-disconnect removal and insertion. A prototype avionics cooling system has been developed consisting of 52 LFT modules and a parallel feed rack/manifold. Both the module and the system have demonstrated outstanding cooling efficiency, and good reliability under preliminary shock and vibration testing. Cooling tests show a significant improvement over edge-conduction cooling. Thermal comparison tests indicate a 20 degrees C improvement in frame surface temperature over an edge-conduction-cooled 50 W module.<>
{"title":"Liquid flow-through cooling for avionics applications","authors":"M. Barwick, M. Midkiff, D. Seals","doi":"10.1109/NAECON.1991.165750","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165750","url":null,"abstract":"An avionics cooling system has been developed that circulates fluid through the structural frame of its SEM-E modules. The liquid flow-through (LFT) module frame is only 100 mils thick, yet is capable of maintaining low junction and surface temperatures for modules dissipating in excess of 200 W. The module form/factor is compatible with existing SEM-E circuit board formats and connectors and features toolless, dripless, quick-disconnect removal and insertion. A prototype avionics cooling system has been developed consisting of 52 LFT modules and a parallel feed rack/manifold. Both the module and the system have demonstrated outstanding cooling efficiency, and good reliability under preliminary shock and vibration testing. Cooling tests show a significant improvement over edge-conduction cooling. Thermal comparison tests indicate a 20 degrees C improvement in frame surface temperature over an edge-conduction-cooled 50 W module.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131751117","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165894
K. Rattan, V. Feliu
A method to control the tip position of single-link flexible manipulators is presented. The method is based on the dynamic model inversion technique. The feedforward controller obtained as a result of this inversion drives the arm along a commanded trajectory without any oscillation of the tip. The model inversion of a single-link flexible arm is studied from a discrete point of view. A feedforward controller is developed even in the case when the system is non-minimum phase. The method is general in the sense that it removes oscillations in the arm with any number of vibration modes. This technique results in less residual vibration, has better robustness to system parameter uncertainty, and requires less computation than the existing methods of vibration control.<>
{"title":"Feedforward control of flexible manipulators","authors":"K. Rattan, V. Feliu","doi":"10.1109/NAECON.1991.165894","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165894","url":null,"abstract":"A method to control the tip position of single-link flexible manipulators is presented. The method is based on the dynamic model inversion technique. The feedforward controller obtained as a result of this inversion drives the arm along a commanded trajectory without any oscillation of the tip. The model inversion of a single-link flexible arm is studied from a discrete point of view. A feedforward controller is developed even in the case when the system is non-minimum phase. The method is general in the sense that it removes oscillations in the arm with any number of vibration modes. This technique results in less residual vibration, has better robustness to system parameter uncertainty, and requires less computation than the existing methods of vibration control.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114945036","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165785
Z. Yiyu, S. Zhongkang
A method used for estimation of the position of a moving pulse emitter with constant pulse repeat interval by a single observer is studied. The performance of the estimator depends on the emitter trajectory. A specific trajectory that is symmetrical about the closest point of approach is considered. Under this condition the Fisher information matrix has a simple form. The Cramer-Rao lower bound is then derived.<>
{"title":"Performance analysis of a passive tracking filter using DOA and TOA measurements (direction of arrival/time of arrival)","authors":"Z. Yiyu, S. Zhongkang","doi":"10.1109/NAECON.1991.165785","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165785","url":null,"abstract":"A method used for estimation of the position of a moving pulse emitter with constant pulse repeat interval by a single observer is studied. The performance of the estimator depends on the emitter trajectory. A specific trajectory that is symmetrical about the closest point of approach is considered. Under this condition the Fisher information matrix has a simple form. The Cramer-Rao lower bound is then derived.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114990223","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165863
R. J. Evans
The use of electrical circuits to model the thermal warming and cooling of database objects is discussed with reference to the application of forward looking infrared systems. Previous models yielded object surface temperature predictions which varied much too widely across a diurnal cycle. Thermal capacitance, or heat storage capacity of database objects, was also ignored. Analysis of the original circuit and modifications of this circuit reveals that predicted object surface temperature is highly dependent upon material parameters, including the thickness of the object, its thermal conductivity, and its attachment to other objects. It is noted that, while many of the shortcomings can be overcome, it is clear that in order to produce relative levels of display luminance which are faithful reproductions of the thermal output of individual database objects, more precision is required for parameter estimation. While such precision may be useful for target acquisition models, use of such a complex package for flight training appears unwarranted.<>
{"title":"Simulation in infrared imaging: using electrical circuit principles to model heat transfer","authors":"R. J. Evans","doi":"10.1109/NAECON.1991.165863","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165863","url":null,"abstract":"The use of electrical circuits to model the thermal warming and cooling of database objects is discussed with reference to the application of forward looking infrared systems. Previous models yielded object surface temperature predictions which varied much too widely across a diurnal cycle. Thermal capacitance, or heat storage capacity of database objects, was also ignored. Analysis of the original circuit and modifications of this circuit reveals that predicted object surface temperature is highly dependent upon material parameters, including the thickness of the object, its thermal conductivity, and its attachment to other objects. It is noted that, while many of the shortcomings can be overcome, it is clear that in order to produce relative levels of display luminance which are faithful reproductions of the thermal output of individual database objects, more precision is required for parameter estimation. While such precision may be useful for target acquisition models, use of such a complex package for flight training appears unwarranted.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133768264","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165898
F. A. Dill, B. Deer
Genetic algorithms are used to search for network weights which cause the dynamical network to produce long attractors. Several variations of the genetic algorithm are described, and the search performance is compared to that of the base-line method of randomly selected weights. It is pointed out that dynamical networks support self-sustaining patterns of oscillation which can be initiated by a one-time input strobe. These self-sustaining patterns, or attractor cycles, evolve into a repeating pattern for most combinations of network weights and input strobes. Attractor cycles vary in length and are a function of the particular network weights and the particular strobe. An interesting property of these networks is that a particular set of network weights can produce, or recall, a variety of repeating patterns, where the one that is evoked depends on the triggering strobe. This effectively is the storage of sequential patterns in the form of attractors.<>
{"title":"An exploration of genetic algorithms for the selection of connection weights in dynamical neural networks","authors":"F. A. Dill, B. Deer","doi":"10.1109/NAECON.1991.165898","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165898","url":null,"abstract":"Genetic algorithms are used to search for network weights which cause the dynamical network to produce long attractors. Several variations of the genetic algorithm are described, and the search performance is compared to that of the base-line method of randomly selected weights. It is pointed out that dynamical networks support self-sustaining patterns of oscillation which can be initiated by a one-time input strobe. These self-sustaining patterns, or attractor cycles, evolve into a repeating pattern for most combinations of network weights and input strobes. Attractor cycles vary in length and are a function of the particular network weights and the particular strobe. An interesting property of these networks is that a particular set of network weights can produce, or recall, a variety of repeating patterns, where the one that is evoked depends on the triggering strobe. This effectively is the storage of sequential patterns in the form of attractors.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134262763","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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