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Siemens PLM Software

Siemens PLM Software, Plano, TX, has introduced synchronous technology, a history-free, feature-based CAD modeling technology integrated into the company’s NX™ and Solid Edge® software. The technology simultaneously synchronizes geometry and rules through a decision- making inference engine. For design, it defines persistent dimensions, parameters, and design rules at the time of creation or edit, without the need for an ordered history. It also automates the implementation of planned or unplanned design changes in seconds, regardless of design orientation, and with or without a history tree. The technology allows users to reuse data from other CAD systems without remodeling. It also merges 2D and 3D environments, and automatically i8nfers common constraints and executes typical commands based on cursor position. For Free Info .

Posted in: Products

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Micro-Resistojet for Small Satellites

An efficient micro- resistojet has been developed with thrust in the millinewton level, with a specific impulse of approximately 250 seconds and power input of 20 watts or less that is useful for applications of up to 1,000 hours of operation or more. The essential feature of this invention is a gas- carrying tube surrounding a central heating element. The propellant is flashed into vapor and then passes through a narrow annulus between the tube and the heater where it is cracked (in the case of methanol, into CO and H2) before being discharged through a de Laval nozzle to produce thrust.

Posted in: Briefs

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Innovation Begets Innovation

By Robert “Buzz” Kross Senior Vice President of the Manufacturing Division Autodesk San Rafael, CA Innovation is a way of life at Autodesk. Since our introduction of AutoCAD software in 1982, Autodesk has developed the broadest portfolio of state-ofthe- art digital prototyping solutions to help customers experience their ideas before they are built.

Posted in: Articles

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Tool Suite Enables Software Testing for Orion Crew Exploration Vehicle

LDRA tool suite LDRA San Bruno, CA 650-583-8880 www.ldra.com Aimed at safely transferring astronauts to and from the International Space Station (ISS), the Moon, Mars, and other destinations beyond low-Earth orbit (LEO), the Orion Crew Exploration Vehicle (CEV) is a state-of-the-art human spaceflight system. Lockheed Martin Corporation has selected the LDRA tool suite for software verification and automated testing on the Orion CEV program, and to enable developers to achieve the stringent safety-critical standards required to ensure safe transfer of the astronauts. NASA has awarded Lockheed Martin a multimillion-dollar contract for Orion’s development.

Posted in: Application Briefs

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Immersive Display System Enables Virtual Reality in NASA Lab

Immersive CAVE™ display system Mechdyne Corp. Marshalltown, IA 641-754-4649 www.mechdyne.com Mechdyne Corporation has installed a CAVE™ display system in the Fossett Laboratory for Virtual Planetary Exploration at Washington University St. Louis (WUSTL). WUSTL is home to the Geosciences Node of the NASA Planetary Data System, with responsibility for managing data related to the study of surfaces and interiors of terrestrial planetary bodies. The Laboratory will provide 3D imaging capability for visualization of data collected by national and international space exploration programs, including the ongoing Mars Exploration Program.

Posted in: Application Briefs

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Miniature Latching Valve

This valve remains either open or closed when power is not supplied. A miniature latching valve has been invented to satisfy a need for an electrically controllable on/off pneumatic valve that is lightweight and compact and remains in the most recently commanded open or closed state when power is not supplied. The valve (see figure) includes a poppet that is moved into or out of contact with a seat to effect closure or opening, respectively, of the flow path. Motion of the poppet is initiated by electrical heating of one of two opposing pairs of nickel/titanium shape-memory alloy (SMA) wires above their transition temperature: heated wires contract to their “remembered” length, applying tension to pull the poppet toward or away from the seat. A latch consisting mainly of a bistable Belleville washer (a conical spring) made of a hardened stainless steel operates between two stable positions corresponding to the fully closed or fully open state, holding the poppet in one of these positions when power is not applied to either pair of SMA wires.

Posted in: Briefs

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Alignment-Insensitive Lower-Cost Telescope Architecture

This next-generation architecture enables construction of very large telescopes. This architecture features an active wavefront sensing and control scheme along with methods for measuring the relative positions of the primary to aft optics, such as the secondary mirror, and should enable larger and cheaper telescope architectures needed for future applications. This design overcomes the stability requirements of large telescope primary mirrors.

Posted in: Briefs, TSP

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