A Design for Composing and Extending Vehicle Models

Madden, Michael M.; Neuhaus, Jason R.

doi:10.2514/6.2003-5458

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Developers reuse the LaSRS++ framework by specializing LaSRS++ classes with product-specific derivations and by registering key derived classes to the framework. 13 Sparks states that calling frameworks achieve higher rates of reuse because "the bulk of the framework is reused from the single decision to reuse that framework". 12 However, a given product may not reuse the whole framework.…”

Section: Maddenmentioning

confidence: 99%

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Measuring Reuse in a Simulation Framework

Madden

2004

Journal of Aerospace Computing, Information, and Communication

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In the early 1990s, NASA Langley Research Center (LaRC) embarked on a systematic reuse program for source code development in its simulation facilities. The program produced an object-oriented framework for real-time, human-in-the-loop vehicle simulation. The Langley Standard Real-Time Simulation in C++ (LaSRS++) was used as a case study to evaluate three static methods for identifying reusable code and to use their results to evaluate LaSRS++ as a reusable asset through metrics. Since static analysis cannot accurately measure reuse in large frameworks, two of the methods, the object chain and dependency chain methods, were designed to represent the lower and upper bounds of potentially reused components. With a large gap between lower and upper bounds, the refined object chain method was created to better estimate the likely set of reused assets. Reuse metrics were then extracted from simulation models of 11 aircraft. The three identification methods calculated average reuse rates of 74%, 84%, and 86%. The study also examined the ability to extend the adaptable architecture of LaSRS++ to the aircraft models using object-oriented techniques. Developers could then treat the aircraft models as reusable assets that are specialized using the same process for specializing LaSRS++. The models are specialized for individual experiments or to create a new simulation of a different aircraft type in the same aircraft family. These specializations are called variants. The reuse measurement techniques were applied to 10 variants. Reuse levels of aircraft models by variants were 60% -99%, comparable to reuse levels of LaSRS++ by the aircraft models.

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Section: Maddenmentioning

confidence: 99%

“…A detailed treatment of aircraft model construction in LaSRS++ that exemplifies prescribed product creation is found in Ref. 13.…”

Section: Maddenmentioning

confidence: 99%

Measuring Reuse in a Simulation Framework

Madden

2004

Journal of Aerospace Computing, Information, and Communication

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“…LaSRS++ was designed to be platform non-specific, and has been used on IRIX, Linux, Solaris, and Windows operating systems. See references [12][13][14][15][16][17][18][19][20] for detailed descriptions of the LaSRS++ framework and application software.…”

Section: Launch Abort System (Larc)mentioning

confidence: 99%

An Orion/Ares I Launch and Ascent Simulation - One Segment of the Distributed Space Exploration Simulation (DSES)

Chung

Crues

Blum

et al. 2007

AIAA Modeling and Simulation Technologies Conference and Exhibit

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This paper describes the architecture and implementation of a distributed launch and ascent simulation of NASA's Orion spacecraft and Ares I launch vehicle. This simulation is one segment of the Distributed Space Exploration Simulation (DSES) Project. The DSES project is a research and development collaboration between NASA centers which investigates technologies and processes for distributed simulation of complex space systems in support of NASA's Exploration Initiative. DSES is developing an integrated end-to-end simulation capability to support NASA development and deployment of new exploration spacecraft and missions. This paper describes the first in a collection of simulation capabilities that DSES will support.

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“…In the LaSRS++ framework, the VehicleSystem class interfaces vehicle models with subsystem models to decouple the two 7,8 . In the F-16A, the F16aAeroSystem is the interface between the F16a and the F16aAero classes (Fig.…”

Section: A Lasrs++ Overviewmentioning

confidence: 99%