MEMs

Eurocard Subrack Enclosures

Pixus Technologies (Waterloo, Ontario, Canada) offers Eurocard subracks for 3U and 6U boards in multiple configurations. The subrack enclosures can house backplanes or special modules for industrial, mil/aero, communications, medical, energy, and test/measurement industries. The Pixus subrack line features a modular design, with extrusions and tapped strips in standard intervals allowing a wide range of configurations without customization. The EMC version features gasketing and optional EMC covers. Compact versions of the enclosures are available in 42 HP and 21 HP sizes standard. The Mobile Rugged industrial subrack features reinforced components and has been used in European railway applications. The standard and EMC subracks also come in 4U and 7U sizes, with 1U of spacing below the card cage for fan implementation.

Posted in: Products, Products, Electronics & Computers
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DC/DC Converter

Green Watt Power, a division of Calex Mfg. Co., Inc. (Concord, CA) has announced the 450 Watt EVD-89-S-450-G3201 DC/DC converter. The EVD is a ruggedized DC/DC converter suitable for electric vehicle, marine, industrial and other applications which draw power from a bank of batteries or another high voltage DC power source. The input range of the EVD is 50 to 125 VDC. The output voltage range is 13.6 VDC to 14 VDC, making the unit ideal for powering onboard accessories, lights, instruments, etc. The output current rating of the EVD is 33A with output surge capability up to 45A. The EVD-89- S-450-G3201 is isolated input to output. The isolation voltage is 1500 VAC. Overall output voltage accuracy is +/- 3%. Line and load regulation is +/- 0.02% and 5% respectively. Output ripple is 130mV peak to peak. The efficiency of the unit is 90%. The ambient operating range is -40 to +55°C. The EVD-89-S-450-G3201 measures 6.22” x 6.69” x 1.97” high. The converter is fully encapsulated for rugged reliability.

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System-on-Chip

Ultra low power (ULP) RF specialist Nordic Semiconductor ASA (Oslo, Norway) has announced the availability of a lower cost variant of its nRF51822 Bluetooth® low energy and proprietary 2.4GHz SoC (System-on-Chip) that will offer an identical feature, peripherals, and performance set but half the flash memory at 128kB (instead of 256kB) and be based on the same nRF51 Series technology platform. This means it will offer the same multiprotocol radio and a 32-bit ARM Cortex-M0 based processor optimized for ultra-low power wireless applications and deliver -92.5dB RX sensitivity in Bluetooth low energy mode; up to +4dBm output power in all modes; up to 9.5dBm improvement in link budget compared to previous generations of class-leading Nordic chips, and sub-10mA peak currents running off a 3V coin cell battery for months or years of battery life (depending on the application).

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PC/104 CAN Module

WinSystems (Arlington, TX) has introduced their PCM-CAN-2-ISO, a PC/104- compliant, dual channel, isolated Controller Area Network (CAN) module with Windows and Linux drivers available. The board employs high-speed isolated data couplers and power supplies to provide 1000V protection between the two NXP SJA1000 CAN controllers and the network interface. Each CAN channel can provide isolated +5 VDC power or receive isolated +5 to +12 VDC power from the interface for additional flexibility. The +5 VDC power supply includes overvoltage, overcurrent, and short-circuit protection. The PCM-CAN-2-ISO is compliant with CAN specifications 2.0A (11-bit ID) and 2.0B (29-bit ID). The PCM-CAN-2-ISO supports transfer rates to 1 Megabits per second and has jumper selectable termination resistors so it can be used in various topology systems.

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Media Processing Accelerator

Emerson Network Power (Tempe, AZ) has announced a performance breakthrough for adding voice and video to network server applications. Where a typical commercial Host Media Processing solution is limited to 2000 ports per server, a single Emerson Network Power PCIE-8120 PCI Express media processing acceleration card is capable of transcoding over 7000 bidirectional voice channels from G.711 to G.729A, and multiple cards can be added to a single server for even higher performance. Featuring up to 12 low power Octasic digital signal processors (DSPs) with embedded voice or video firmware, the Emerson Network Power PCIEe-8120 can also transcode over 300 mobile video streams at CIF resolution, and offers support for high definition video resolutions up to 1080p. It enables users to add high density, highly scalable voice and video processing to network applications, while using less space, less power and at lower cost than the alternative of adding more servers or suffering significantly reduced application performance.

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Rotating Detonation-Wave Engines

All Navy aircraft and missiles use gasturbine engines for propulsion. Many ships are also dependent on gasturbine engines to generate both propulsive power and electricity. These engines are fundamentally similar to engines used to power commercial airplanes. Future ships moving to an “all electric” paradigm for the propulsion system will still require these gas-turbine engines to generate electricity for the propulsion system and also for other critical onboard systems. Because of the amount of power required by modern warfighting ships, and the prospect that this power requirement will only increase, there is a strong interest in improving the specific fuel consumption of these engines.

Posted in: Briefs, Mechanical Components, Electric power, Fuel economy, Gas turbines, Marine vehicles and equipment, Military aircraft, Missiles
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Bi-Axial Vibration Energy Harvesting

For air platforms, the installation of Structural Health Monitoring (SHM) systems is complicated by the fact that the majority of SHM devices need to be fitted on internal aircraft structure, underneath the aircraft’s skin. If the SHM device is in a location that is difficult to access, then powering the device may be problematic because traditional powering methods are generally not feasible. For example, replacing batteries on many SHM devices deployed across a fleet would be impractical, and accessing an onboard power system to supply SHM devices may lead to flight worthiness and certification issues.

Posted in: Briefs, Physical Sciences, Aircraft structures, On-board energy sources, Vehicle health management, Vibration
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Quantitative Analysis of a Hybrid Electric Humvee for Fuel Economy Improvement

The Army has acquired several hybrid platforms to assess the applicability of hybrid technology for military missions. These hybrid platforms include both series and parallel hybrid topologies. This work compares a conventional HMMWV (High Mobility Multi-purpose Wheeled Vehicle) M1113 with a series hybrid HMMWV XM1124 in terms of fuel economy improvements over three military drive cycles.

Posted in: Briefs, Physical Sciences, Architecture, Fuel economy, Hybrid electric vehicles, Military vehicles and equipment
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Electrochemical Energy Storage Materials

One of the most important requirements in next-generation batteries is to concurrently deliver high energy density and high power density (fast charge-discharge rates). The high power density requirement can be met with enhanced ion and electron transport kinetics in batteries, which in turn requires active materials with high ion diffusion constants and conductive additives or architectures for faster electron transport to respective current collectors. It is well known that nanostructuring the electrode materials would significantly enhance the characteristic time constant for ion diffusion, thereby reducing the intercalation/deintercalation time.

Posted in: Briefs, Materials, Battery cell chemistry, Energy storage systems, Nanotechnology
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Modeling and Simulation Techniques for Unmanned Vehicle Systems

Unmanned Autonomous Vehicle (UAV) systems have become possible in recent history thanks primarily to the effects of Moore’s Law — the doubling of processing power every 18 months. This trend, coupled with improvements in sensors and actuators, has enabled the advanced signal and data processing necessary to control UAVs. However, the complexity of UAV systems has taxed traditional design workflows, and revealed numerous challenges such as shorter design cycles, greater performance and reliability demands, and cost constraints.

Posted in: Articles, Aerospace, CAD / CAM / CAE, Computer simulation, Design processes, Autonomous vehicles, Unmanned aerial vehicles
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