Tech Briefs

Making a Metal-Lined Composite-Overwrapped Pressure Vessel

The metal liner reduces loss of gas by diffusion without adding much weight.

Posted in: Briefs, Manufacturing & Prototyping

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Shipbuilders Design Pipeline Dredging Barge With FEA Software

Finite element analysis software aids in the design of an undersea natural gas liquids pipeline. A South American pipeline project that traverses the Amazon jungle and the Andes Mountains to the Pacific coast originates in the Camisea fields of eastern Peru, which are among the world’s largest natural gas (NG) reserves, holding approximately 11 trillion cubic feet of NG and 600 million barrels of associated natural gas liquids (NGL). To access these reserves, a $500-million (USD) project was led by Pluspetrol Peru Corporation S.A. (Pluspetrol) that included construction of two pipelines — one for NG (714 km) and the other for NGL (540 km). As construction of the pipelines neared completion, work focused on endpoints such as the fractionation plant where NGL would be processed into commercial products including propane, butane, and condensates.

Posted in: Briefs, Manufacturing & Prototyping

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Two Methods for Efficient Solution of the Hitting-Set Problem

A paper addresses much of the same subject matter as that of “Fast Algorithms for Model-Based Diagnosis” (NPO-30582), which appears elsewhere in this issue of NASA Tech Briefs.

Posted in: Briefs, TSP, Information Sciences

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Biased Randomized Algorithm for Fast Model-Based Diagnosis

The bias increases the likelihood of making a minimal diagnosis.

Posted in: Briefs, TSP, Information Sciences

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Fast Algorithms for Model-Based Diagnosis

Methods based on Boolean functions and linear programming are more practical for complex systems. Two improved new methods for automated diagnosis of complex engineering systems involve the use of novel algorithms that are more efficient than prior algorithms used for the same purpose. Both the recently developed algorithms and the prior algorithms in question are instances of model-based diagnosis, which is based on exploring the logical inconsistency between an observation and a description of a system to be diagnosed.

Posted in: Briefs, TSP, Information Sciences

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Calculation Management Captures and Tracks Engineering Design Information

A systematic software approach enables designers to manage engineering methods and values.

Posted in: Briefs, Information Sciences

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Telephone-Directory Program

eDirectory is a computer program that makes it possible to view entries in the Jet Propulsion Laboratory (JPL) telephone directory by use of PalmPilot ™ (or equivalent) personal digital assistants.

Posted in: Briefs, TSP, Information Sciences

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