Ultrasonic guided waves provide a convenient and reliable method to detect contaminants on the surface of the structure the wave travels in. Classifying the contaminants is possible by selecting the guided wave mode w...
Ultrasonic guided waves provide a convenient and reliable method to detect contaminants on the surface of the structure the wave travels in. Classifying the contaminants is possible by selecting the guided wave mode with the appropriate wave structure. An ice detection system, using this technology, designed at sensorsystems, Goodrich Corporation is described. The system is demonstrated in-flight and is shown to be successful in detecting ice bonded to the aircraft wing leading edge.
Discussions and sample results are presented for an in-flight wing ice accretion detector based on newly developed ultrasonic guided wave sensors and measurements. Detection over a fairly large area can be accomplishe...
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Tapping of one or more torques (ranges 10 N in and 60 N m) on the steering column of an automobile for the purpose of servo control must satisfy both high accuracy requirements and high safety requirements. A suggesti...
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Tapping of one or more torques (ranges 10 N in and 60 N m) on the steering column of an automobile for the purpose of servo control must satisfy both high accuracy requirements and high safety requirements. A suggestion for developing a low-cost solution to this problem is described below. Strain gages optimally satisfy both these requirements: however, for cost reasons, these are not applied directly to the steering column but to a prefabricated flat steel rod that is laser welded to the torque rod of the steering column. The measuring direction of the strain gages is under 45-degrees to the steering-column axis. The strain gages are either vacuum metallized onto the support rod as a thin film or laminated in a particularly low-cost way by means of a foil-type intermediate carrier. The relatively low output signals of the measuring resistor bridge are amplified on site (on the steering column) with an integrated electronic evaluation circuit and converted into a frequency-analog, highly interference-proof signal. Neither collector rings nor cables are needed to connect the signal output and power supply to the fixed parts of the body. Both connections are made totally non-contact by means of a very simple and low-cost rotary transformer, which surrounds the steering column concentrically and has two separate winding chambers. In this case, it is practically impossible for air-gap fluctuations and similar interferences to falsify the frequency-analog measuring signal.
This paper will historically review and describe the Navy High Energy Laser Weapon System (HELWS). Advances in anti-ship cruise missiles (ASMs), which present the greatest challenge in surface ship self defense, are n...
This paper will historically review and describe the Navy High Energy Laser Weapon System (HELWS). Advances in anti-ship cruise missiles (ASMs), which present the greatest challenge in surface ship self defense, are necessitating the development of significantly more sophisticated and expensive surface-to-air missiles in order to counter the threat. The next generation of ASMs, as represented by the French ANS, will be capable of skimming only meters above the sea surface at multi-mach speeds, while performing evasive maneuvers during terminal run-in. This type of threat has essentially eliminated naval gun systems from the role of ship self-defense, and has significantly reduced the effectiveness of cu''ent missile systems. Under development for the past twenty years, the High Energy Chemical Laser appears to be a feasible solution to the ship self-defense problem. Capable of operating effectively in all weather conditions except dense fog, a HELWS requires no conventional rire control solution, since it operates at the speed of light. Any target that can be tracked can be enpged. Furthermore, once the beam director is locked onto a target, the system is insensitive to target maneuvers. By tailoring the lase period to the threat, the effective P(k) of an HELWS is essentially 1. Using chemical energy as a primary power source removes the requirement for additional costly and heavy power generation equipment aboard ship. In the context of the foregoing arguments, cost per kill becomes a fraction of the cost of a two-round missile salvo. The technology required to field a shipboard HELWS has been demonstrated by the Navy Mid-InfraRed advanced Chemical Laser (MIRACL) and the Sea Lite Beam Director (SLBD). Its success in bringing down a Mach 2.2 Vandal missile in 1989 was dramatic proof of the effectiveness of such a system. Recent studies have shown that the MIRACL/SLBD can be repackaged as a HELWS to fit into the equivalent volume occupied by a 5''154 Mk 45 gun mount
The mobile robot prototypes developed at the Oak Ridge National Laboratory (ORNL) Center for engineeringsystemsadvanced Research (CESAR) are equipped with sonar sensors and CCD cameras that are used to support auton...
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The mobile robot prototypes developed at the Oak Ridge National Laboratory (ORNL) Center for engineeringsystemsadvanced Research (CESAR) are equipped with sonar sensors and CCD cameras that are used to support autonomous navigation and simple inspection tasks in an a priori unknown and unstructured dynamic environment. A laser range camera is being added to the sensor suite of HERMIES III, a mobile robot that is currently being built. The authors summarize work directed at extracting information from data collected with these sensors and integrating it, in order to produce reliable descriptions of the robot's environment. Specifically, they describe the integration of two-dimensional vision and sonar range information. The integration methodology is based on a framework for multisensor integration that consists of multiple, distributed world models and appropriate mappings among them. All operations are carried out onboard the mobile robot using a 16-processor hypercube computer.< >
作者：
THE HONORABLE DAVID E. MANNASSISTANT SECRETARY OF THE NAVYThe Honorable David E. Mann:
after receiving his Ph. D. in Chemistry from the University of Chicago in 1948. engaged in postdoctoral research in Molecular Spectroscopy at the University of Minnesota and at Harvard until 1951. and then held positions as Physicist and Chief of the Molecular Spectroscopy Section at the Bureau of Standards until 1965. During this latter period he became internationally recognized for his research in the application of cryospectroscopy to the determination of the molecular structures of high–temperature and unstable molecules and in 1957–58 was awarded both the Guggenheim and the Fullbright Fellowships for further study abroad. In 1966. Dr. Mann joined the Advanced Research Projects Agency
and in 1967 was appointed Deputy Director of the Ballistic Missile Defense Office. The following year he became the first Director of the newly established Strategic Technology Office where he initiated major development programs in high energy lasers long–range infrared and radar sensors special communications techniques and a wide range of undersea and AS W sensor technology. In these he was instrumental in ensuring their effective adoption by the Army Navy and the Air Force for further exploitation and for this was awarded the Secretary of Defense Meritorious Civilian Service Medal in 1974. In 1973
Dr. Mann became the Special Assistant to the Chief of Naval Operations for Navy Advanced Systems Projects and until 1977 when he was appointed by the President to his present position as Assistant Secretary of the Navy for Research Engineering and Systems he was the key figure in the rapid and efficient transfer of technology into advanced antisubmarine warfare systems that are vital to the national security of the United States. In recognition of his outstanding contributions the Secretary of the Navy personally awarded him the Secretary of the Navy Distinguished Civilian Service Award in April 1977. Dr. Mann is a member of the Institute of Electrical an
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