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Axial Field Electric Motor

An axial field electric motor comprises one or more elements such as a rotor mounted for rotation and multiple axial flux permanent magnets carried by the rotor. The axial flux permanent magnets are oriented such that an associated magnetic flux produced thereby is at least substantially axially oriented. The axial flux permanent magnets are positioned around the rotor with alternating orientations of flux direction so that a flux direction of adjacent magnets is at least substantially axially oriented but opposite in direction. The radial flux permanent magnets are also carried by the rotor and oriented so that an associated magnetic flux produced is at least substantially radially oriented.

Posted in: Briefs, Mechanical Components
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Miniature Rotorcraft Flight Control Stabilization System

Autonomous rotorcraft provide improved capability in performing military missions such as reconnaissance, targeting, border patrol, and environmental sensing. A common difficulty in applying miniature rotorcraft to these areas is the complexity and specialization of the control. In general, rotorcraft have extreme vibration that make miniature inertial measurement difficult. Sources of vibration include the main rotor, tail rotor, and blade flapping dynamics. Typical sensors include MEMS accelerometers, which are sensitive to vibration. Inclusion of alternative and or redundant sensors may be used to reduce vibration sensitivity and add useful additional feedback.

Posted in: Briefs, Physical Sciences
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Studies of Dynamic Fracture in Brittle Materials

A program of research spanning several years ending in November 2005 was dedicated primarily to formulation and analysis of canonical boundary- value problems in mathematical modeling of dynamic fracture in brittle materials. The sub-topics within the broad topic of dynamic fracture in brittle materials that were studied, and the accomplishments in each sub-topic, are summarized as follows:

Posted in: Briefs, Physical Sciences
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Acceleration Strain Transducer Containing Cantilever Flaps

A recently invented acceleration strain transducer is based on the principle of a conventional spring-and-mass acceleration transducer combined with a linear strain sensor that measures the acceleration-induced deflection of the spring. The invention is compatible with any of a variety of linear strain sensors, including conventional foil resistance strain gauges, fiber-optic and fiber-laser strain sensors, and electrically-conductive-liquid strain sensors.

Posted in: Briefs, Physical Sciences
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Simulation of Airflow Through a Test Chamber

A computational-simulation study of the flow of air through a thermo-anemometer chamber was performed to resolve what originally seemed to be an anomaly in the measurement data obtained by use of the chamber. The thermo-anemometer chamber is a test chamber used to measure the rate of generation of heat by a device placed within it. In the original application that produced the apparent anomaly that prompted this study, the chamber was used to measure the power dissipation (as manifested by heating) in an operating power-supply inductor. The apparent anomaly was that the heating of the inductor as calculated from the measurements made by use of the chamber seemed unrealistically high.

Posted in: Briefs, Physical Sciences
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Study of Submodeling of a Small Component in a Structure

A study was performed to evaluate the accuracy achievable in the use of submodeling in finite-element modeling of the mechanical response of a structural system that includes components embedded in a larger structure that is subjected to a large transient load. The specific system studied was a simplified model of a “smart” projectile containing a substructure that supported an electronic-circuit board on which were mounted two capacitors and an eight-lead integrated circuit (see figure). The main body or shell of the projectile was represented as a cylindrical ring supporting the substructure. The dimensions of the various components were chosen to be typical of “smart” munitions. The transient load condition was represented by a velocity-versus-time boundary condition, typical of the velocity versus time of a projectile at launch, imposed at the lower surface of the cylindrical ring.

Posted in: Briefs, Information Technology
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Next-Generation Information Systems Architectures

A document describes a paradigm in which low-altitude unmanned aerial vehicles (UAVs) with wireless communication capability are used to assist networking among a set of ground stations. This new paradigm is attractive because UAVs can be dynamically deployed in a wide variety of geographical territories. Furthermore, UAVs often have high-quality line-of-sight communication links with other UAVs, and ground stations as aerial links usually suffer relatively little shadowing compared with their terrestrial counterparts.

Posted in: Briefs, Information Technology
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3D Stacked IC Technology (Esc Booth # 1535)

IMEC (Leuven, Belgium) has announced significant progress with its 3D-SIC (3D stacked IC) technology. IMEC recently demonstrated the first functional 3D integrated circuits obtained by die-to-die stacking using 5μm Cu through-silicon vias (TSV). The 3D stacked integrated circuits will be further developed on 200mm and 300mm wafers, integrating test circuits from participating partners. The dies were realized on 200mm wafers in IMEC's reference 0.13μm CMOS process with an added Cu-TSVs process. For stacking, the top die was thinned down to 25μm and bonded to the landing die by Cu-Cu thermocompression.

For Free Info Visit Here.

Posted in: Products, Products, Electronics & Computers
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On-Chip Debug Solutions (Esc Booth #1840)

Macraigor Systems (Brookline Village, MA) has ported their proprietary OCDemon On-Chip Debug Technology to ARM Cortex-M3 processors and is offering full GNU toolsets to be used with these processors. Engineers developing applications for these new processors can control and debug their hardware designs and application software without the use of other system resources such as UARTs, Ethernet channels, or parallel ports. Macraigor's JTAG interface devices are available for use with the ARM Cortex- M3 based cores as well as other ARM family devices including ARM 7, ARM 9, ARM 11, Freescale's iMX series, XScale, and others.

Debug method is available for hardware initialization and debug as well as Flash EEPROM programming, kernel, driver, and application software debug.

For Free Info Visit Here

Posted in: Products, Products, Electronics & Computers
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SMP Virtual Machine (Esc Booth #1610)

Aonix® (San Diego, CA) now offers the PERC Ultra SMP with support for multicore hardware. PERC Ultra SMP is a multiprocessor and multicore solution for complex mission-critical embedded and real-time Java applications. When the Java language, initially designed for multithreaded programming environments, is coupled with Aonix's PERC Ultra SMP virtual machine, developers are able to leverage full SMP benefits without rewriting code originally designed to run in older, uniprocessor systems. PERC Ultra's real-time garbage collector ensures that real-time microsecond response can be guaranteed even in missioncritical applications.

With PERC Ultra SMP, all Java threads access the same shared objects, making them free to relocate themselves within memory. It also allows threads to migrate between processors, a crucial element to load balancing in multicore systems. To handle these needs, Aonix has developed a special patent-pending synchronization technique that ensures that an application thread on one processor does not attempt to access an object while another process is relocating the desired object as part of the garbage collection process. This performance-optimized solution hinges on the generation of specialized code sequences by the PERC Ultra SMP JIT compiler and on an enhanced real-time garbage collection algorithm.

For Free Info Visit Here.

Posted in: Products, Products, Electronics & Computers
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