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Software for Designing Actively Controlled Structures

One program offers capabilities heretofore available only in separate programs. SMARTCOM is a computer program for the analysis and design of actively controlled “smart” structures. Typically, an actively controlled “smart” structure incorporates piezoelectric sensors and actuators that are used, in conjunction with an electrical control system, to damp vibrations. As is the case for other structures, the analysis and design of actively controlled “smart” structures is often best accomplished with the help of finite-element computer programs. Unfortunately, prior finite-element codes do not offer coupled analyses of the mechanical, electrical, and thermal properties of “smart”-structure materials. Also, they are not directly linked with control software, making it necessary to use separate finite-element and control programs to analyze controlled structures. Furthermore, the programs used heretofore to design “smart” structures do not offer capabilities for optimization or for probabilistic or fuzzy analysis.

Posted in: Mechanics, Briefs, TSP

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Testing Soil for Electrokinetically Enhanced Bioremediation

Data from tests provide guidance for in situ treatment. The term “prefield test” denotes an in situ test of contaminated soil in preparation for in situ treatment of the soil by a method called “electrokinetically enhanced bioremediation” (EEB). A prefield test yields data that are helpful in designing and operating an efficient and cost-effective EEB system.

Posted in: Materials, Briefs, TSP

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Software for Network Processing of

The Electronic Portable Information Collection (EPIC) computer program is a computer system that processes work authorization documents (WADs). The EPIC System, which is also known as the Portable Data Collection System, comprises a central data server and portable data terminals. The central data server acts as the host on a local-area network and maintains the WAD data in Structured Query Language (SQL) and a database. The portable data terminals are desktop, laptop, and pen-based tablet computers that run, variously, the Windows 95 or Windows NT operating system and are connected to the central data server via the network.

Posted in: Software, Briefs

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Software for Analyzing Valve-Actuator

A computer program assists engineers in analyzing data on the performances of actuators of fuel and oxidizer valves in the main engines of the space shuttle. The program could be adapted to similar use in other settings in which, as in the space shuttle, valve actuators are instrumented to provide data on commanded versus actual actuator positions. The program acquires such data during a specified diagnostic procedure in which valves are opened and closed. The program processes the data and generates several indications of performance, including trend plots, delta command minus actual positions plots, ramp-rate plots, error-from-command plots, and the means and standard deviations of the plotted quantities. The advantage afforded by the program is that it gives more information than does a simple pass/fail testing criterion. By looking at engineering performance profiles generated by this program during tests performed at different times, the engineers can identify valves that are about to fail in time to replace them.

Posted in: Software, Briefs

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KPP — a Preprocessor for VHDL

KPP is a computer program that serves as a preprocessor for VHDL code. [“VHDL” signifies VHSIC Hardware Description Language, which is a language used by the United States Department of Defense for describing, designing, and simulating very-high-speed integrated circuits (VHSICs).] KPP is based on, and similar to, CPP, which is a preprocessing program for the C computing language. KPP adds certain features that are useful to digital design engineers but are lacking in VHDL. These include, most notably, a capability for nested looping. KPP also provides a number of standard functions for defining and undefining variables, incorporating contents of named files, conditional execution of instructions, and block comments. The use of KPP can enable faster coding and greater reuse of designs. KPP can run in the Windows 95, Windows 98, and Windows NT operating systems.

Posted in: Software, Briefs, TSP

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Exhaustible Energy



Posted in: Blog

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Compressor-Free Fridge



Posted in: Blog

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