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Executive Perspectives: Software

DOMINIC GALLELLO President & CEO MSC Software Corporation Newport Beach, CA www.mscsoftware.com The foundation stones of CAE were laid in the 1960s during the race for space. Because of the obvious defense implications, this was a national imperative. It was a time of virtually unlimited government funding for advancing engineering methods — long nights and weekends, with country first and family second.

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Executive Perspectives: Software

SVANTE LITTMARCK President & CEO COMSOL, Inc. Burlington, MA www.comsol.com With the birth some 50 years ago of computers based on integrated circuits and semiconductors, engineers had a tool that could potentially produce numerical solutions to differential equations based on the laws of science — equations that realistically modeled the physics at hand, not just a simplified version that modeled the physics in a perfectly ideal case. At that point, numerical analysis became practically very important.

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Executive Perspectives: Software

JON HIRSCHTICK Founder and Chairman of the Board Onshape Cambridge, MA www.onshape.com Over the past four decades, I’ve watched CAD grow to become a vital part of the way virtually all products are designed and manufactured. In 1981, when I was a student at MIT’s CAD research lab, there were probably only thousands of CAD users in the world. Now there are millions.

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Rigorous Antenna Noise Temperature Calculation Method for International Space Station Visiting Spacecraft

Lyndon B. Johnson Space Center, Houston, Texas The temperature of the orbiting space station’s Sun-facing side could be up to 250 °F (≈120 °C) and will be a significant antenna noise temperature contributor for visiting spacecraft communication and tracking systems during rendezvous. The conventional antenna noise temperature calculation does not take into account the space station reflection effects, and results in an underestimated antenna and system noise temperature. Thus, the visiting spacecraft communication and tracking system performance could be overestimated during rendezvous.

Posted in: Briefs, Electronics & Computers, Electronics & Computers, Software

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Recurring Anomaly Detection System (ReADS)

Ames Research Center, Moffett Field, California NASA Engineering & Safety Center (NESC) subject matter experts analyze records in various International Space Station and shuttle databases to identify recurring anomalies. The key problems these experts face in analyzing such database records are:

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Method for Automatic Optimization of Yaw Maneuvers for Orbiting Space Vehicles

Lyndon B. Johnson Space Center, Houston, Texas A new method for optimizing yaw attitude maneuvers on the International Space Station (ISS) was developed. Docking and undocking operations often require 180° yaw rotations, which are the most common large maneuvers on the ISS. When optimized, some large maneuvers, previously performed using thrusters, could be performed using control moment gyroscopes (CMGs) or with significantly reduced thruster firings. The ability to perform a non-propulsive or low-propulsive 180° yaw maneuver on the ISS has been proven through the zero propellant maneuver (ZPM) and the optimal propellant maneuver (OPM). The ZPM and OPM were created by Draper Laboratory using the computational approach. Each maneuver is unique, and can only be calculated on the ground because significant computer resources are needed for the calculations.

Posted in: Briefs, Electronics & Computers, Electronics & Computers, Software

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Architecture Framework for Fault Management Assessment and Design

Marshall Space Flight Center, Alabama Modern spacecraft, aircraft, and surface vehicles support complex science missions in harsh environments. These spacecraft and vehicles provide diverse functionality that is deployed on increasingly complex and heterogeneous hardware and mechanical systems, with stringent dependability requirements.

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