MEMs

Queuing Model for Supervisory Control of Unmanned Autonomous Vehicles

One critical aspect in developing a quantitative model of unmanned autonomous vehicle (UAV) operator and system performance has been to adopt a task-centric approach to interface design that entails an explicit representation of actions or tasks that need to be performed by the operator. The representation of work in terms of a task serves as a trace in the system that enables designers to track workload in addition to the task progress and flow of tasks among team members. In supervisory control, the focus is the flow of tasks (work) through a system that is composed of human servers and automated servers (software agents).

Posted in: Briefs, Aerospace, Defense, Electronics & Computers, Information Technology, Computer simulation, Human machine interface (HMI), Autonomous vehicles, Unmanned aerial vehicles
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Real-Time, High-Fidelity Simulation of Autonomous Ground Vehicle Dynamics

Integrated simulation capabilities that are high-fidelity, fast, and have scalable architecture are essential to support autonomous vehicle design and performance assessment for the Army’s growing use of unmanned ground vehicles (UGVs). A mobility simulation of an autonomous vehicle in an off-road scenario was developed using integrated sensor, controller, and multibody dynamics models.

Posted in: Briefs, Aerospace, Defense, Electronics & Computers, Information Technology, Computer simulation, Architecture, Autonomous vehicles, Military vehicles and equipment, Off-highway vehicles and equipment
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Top articles

Predicting cavitation in fuel pumps

Liquid ring pumps are used in aircraft fuel systems in conjunction with main impeller pumps and serve the function of removing fuel vapor and air from the fuel. Thus, their reliable functioning plays a critical role in the safe operation of aircraft during flight. Read more at http://articles.sae.org/12709.

Posted in: News, Aerospace, Defense
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Signal Acquisition Module

ADLINK Technology (San Jose, CA) has released its PXI Express dynamic signal acquisition module, the PXIe- 9529, featuring up to eight 24-bit analog input channels simultaneously sampling at 192 kS/s and a 108 dB dynamic range. The PXIe- 9529 features a vibration-optimized lower AC cutoff frequency of 0.3 Hz, and all input channels incorporate 4 mA bias current.

Posted in: Products, Aerospace, Defense
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Single-Slot VPX Board

Elma Electronic (Fremont, CA) offers a dual-drive VPX storage module that provides more than 2 terabytes (TB) of storage, but requires only one system slot. The 533x family comes with either solid state SLC, MLC, or 2.5" rotating drives.

Posted in: Products, Aerospace, Defense
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Thermal Analysis Tool

A Thermal Analysis tool from Custom MMIC (Westford, MA) estimates the rise in temperature between the ambient surrounding and the bottom of a packaged MMIC when attached to a printed circuit board (PCB). The online calculator does not require a full 3D thermal simulation environment. Users select the package type, the power dissipation inside the package, the PCB board material, the via construction, and the base plate temperature (typically 85°C). The calculator then determines the temperature rise through the PCB to the bottom of the package, under the following assumptions: the PCB is plated with 1 oz. copper (1.4 mils thick), the package is attached to the PCB with solder (2 mils thick), and the base plate is an ideal heat sink.

Posted in: Products, Aerospace, Defense
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Single Board Computer

The “Medusa” VPX3424 from AcQ Inducom (Oss, The Netherlands) is a 3U Open-VPX™ (VITA 65) single board computer (SBC) featuring the T4240 QorIQ® processor from Freescale Semiconductor. The 12-core, 24-thread processor, based on an e6500 core, runs at up to 1.8GHz and 216 GFlops. The SBC includes as much as 12GB DDR3 RAM.

Posted in: Products, Aerospace, Defense
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Rotary Micro Drive

New Scale Technologies (Victor, NY) has announced a prototype rotary piezoelectric micro drive system. Unlike servo drives, the new rotary drive has no measurable jitter, holds position without power, and generates no magnetic fields. The 44 × 44 × 36 mm prototype operates at 350 degrees/second and has an acceleration of 3000 degrees/second2.

Posted in: Products, Aerospace, Defense
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Microwave Analog Signal Generators

Agilent Technologies (Santa Clara, CA) has introduced two microwave analog signal generators: the N5183B MXG and N5173B EXG. The MXG has phase noise of less than -124 dBc/Hz (at 10 GHz, 10 kHz offset). The EXG offers +20 dBm at 20 GHz and low harmonics of <-55 dBc to characterize broadband microwave components, such as filters and amplifiers. The generator also supports continuous-wave (CW) blocking for receiver testing or basic local-oscillator upconversion for point-to-point microwave backhaul links.

Posted in: Products, Aerospace, Defense
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Top products

Engine fuel pump bushings

Metallized Carbon Corp.’s Metcar carbon-graphite bushings offer advantages over traditional metals for use in gear pumps that pump aviation fuel for aircraft engines. The carbon-graphite bushings are used to support both the drive gear shaft and the idler gear shaft. The bushings are preferred for this application because they can use aviation fuel as the bushing lubricant. The bushings are self-lubricating—they can run dry for short periods of time without catastrophic pump failure or significant wear. In addition, they are dimensionally stable, which permits close bushing-to-shaft running clearances. More detail at http://articles.sae.org/12700.

Posted in: Products, Aerospace, Defense
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