Managing shared memory spaces in an object-oriented real-time simulation

Geyer, David; Madden, Michael M.; Glaab, Patricia; Cunningham, Kevin; Kenney, P. Sean; Leslie, Richard

doi:10.2514/6.1998-4532

Cited by 5 publications

(3 citation statements)

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“…Whenever possible, current LaSRS++ platform independent software was reused for GA Framework such as the software written for multi-threads 7 and shared memory 8 . Functions that interact with the operating system and are platform dependent are embedded in classes specific to the platform function and use a factory type of creation for serial connections, loading shared objects/dynamic linked libraries, and starting and checking on processes.…”

Section: Platform Independencementioning

confidence: 99%

General Aviation Data Framework

Blount

Chung

2006

AIAA Modeling and Simulation Technologies Conference and Exhibit

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The Flight Research Services Directorate at the NASA Langley Research Center (LaRC) provides development and operations services associated with three general aviation (GA) aircraft used for research experiments. The GA aircraft includes a Cessna 206X Stationair, a Lancair Colombia 300X, and a Cirrus SR22X. Since 2004, the GA Data Framework software was designed and implemented to gather data from a varying set of hardware and software sources as well as enable transfer of the data to other computers or devices. The key requirements for the GA Data Framework software include platform independence, the ability to reuse the framework for different projects without changing the framework code, graphics display capabilities, and the ability to vary the interfaces and their performance. Data received from the various devices is stored in shared memory. This paper concentrates on the object oriented software design patterns within the General Aviation Data Framework, and how they enable the construction of project specific software without changing the base classes. The issues of platform independence and multithreading which enable interfaces to run at different frame rates are also discussed in this paper.

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Section: Platform Independencementioning

confidence: 99%

General Aviation Data Framework

Blount

Chung

2006

AIAA Modeling and Simulation Technologies Conference and Exhibit

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“…The allocation can be programmed by a developer or determined by a configuration file. The following is a simplified description of how the system establishes the connections; more detailed information can be found in references [1] and [2]. The research computer writes the configuration information into a table at the start of SCRAMNet+.…”

Section: System Viewmentioning

confidence: 99%

Extending a Flight Management Computer for Simulation and Flight Experiments

Madden

Sugden

2005

AIAA Modeling and Simulation Technologies Conference and Exhibit

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In modern transport aircraft, the flight management computer (FMC) has evolved from a flight planning aid to an important hub for pilot information and origin-to-destination optimization of flight performance. Current trends indicate increasing roles of the FMC in aviation safety, aviation security, increasing airport capacity, and improving environmental impact from aircraft. Related research conducted at the Langley Research Center (LaRC) often requires functional extension of a modern, full-featured FMC. Ideally, transport simulations would include an FMC simulation that could be tailored and extended for experiments. However, due to the complexity of a modern FMC, a large investment (millions of dollars over several years) and scarce domain knowledge are needed to create such a simulation for transport aircraft. As an intermediate alternative, the Flight Research Services Directorate (FRSD) at LaRC created a set of reusable software products to extend flight management functionality upstream of a Boeing-757 FMC, transparently simulating or sharing its operator interfaces. The paper details the design of these products and highlights their use on NASA projects. Acronyms 1U= One Unit ("unit" is a standard unit of height for electronic system racks.)

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“…The network protocol to distribute data around the SCRAMNet ring is implemented in the SCRAMNet card and therefore the retrieval of information from the network incurs no overhead and is transparent to each computer. [4] In addition to utilizing high-speed SCRAMNet reflective memory rings, RSIL also uses a high speed Ethernet bus for transfer between subsystems. RSIL also features access to a local area and/or high-speed network and a video distribution network.…”

Section: B Research System Integration Laboratory (Rsil)mentioning

confidence: 99%