Select independent research papers that discuss RTI Data Distribution Service.
Proceedings of World Academy of Science & Engineering Technology, Volume 31 July 2008
This paper discusses the applicability of the Data Distribution Service (DDS) for the development of automated and modular manufacturing systems which require a flexible and robust communication infrastructure. DDS is an emergent standard for datacentric publish/subscribe middleware systems that provides an infrastructure for platform-independent many-to-many communication. It particularly addresses the needs of real-time systems that require deterministic data transfer, have low memory footprints and high robustness requirements. After an overview of the standard, several aspects of DDS are related to current challenges for the development of modern manufacturing systems with distributed architectures. Finally, an example application is presented based on a modular active fixturing system to illustrate the described aspects.
Lincoln Laboratory Journal, Volume 16, Number 2
Abstract: Modern military satellite communications terminals have typically been built as multiprocessor systems. Because of increasing pressure for reuse and modularity, current programs have been encouraged to consider the use of component middleware. While Common Object Request Broker Architecture is the most mature middleware standard available, its invocation semantics present considerable challenges for the development of such systems. Through reasoning about quality attributes, we found that a real-time publish-subscribe middleware reduces coupling, improves composability, and reduces the risk of architectural mismatch, deadlock, and integration problems compared to an invocation based system. In building a communications-on-the-move (COTM) node, we found that this type of middleware, which exemplifies an implicit-invocation architectural style, promotes ease of system evolution and an incremental integration approach.
Abstract: As control systems become more distributed and they are implemented with smaller hardware and software components, implementing the necessary communication links becomes challenging. There are considerable technical difficulties in guaranteeing upper bounds for latencies in motion or machine control, synchronizing the execution and communication of distributed components, taking corrective action in fault situations and reconfiguring the system.
In this paper, we discuss the main communication requirements of distributed control systems and use them to evaluate a certain distribution service product.
Abstract: This thesis has been written as a part of a research project, whose goal is to define the architecture and communication requirements of next-generation process automation systems. We focus on defining appropriate communication mechanisms for components that communicate with each other using Ethernet.
The theoretical part starts by summarizing the communication requirements that have been defined in the research project (OHJAAVA-2). Two middleware standards, the CORBA Notification Service and RTPS, are then described and their usefulness for our purposes is evaluated.
The practical part contains a description of a testing environment for evaluating a RTPS implementation. The test cases are based on communication scenarios that are typically encountered in process automation systems. The results are then presented and the impact of all relevant factors is analyzed.
We conclude that the RTI Data Distribution Service implementation of RTPS is a very promising middleware solution for process automation systems. There is no perfect product that satisfies all of our requirements, but good results can be expected from using RTPS, if the system designers appreciate the strengths and limitations of the middleware standard.
Abstract: Seaware is a publish-subscribe middleware used in multi-vehicle networked systems composed of autonomous and semi-autonomous vehicles and systems.
Seaware provides a high level interface to network communications and may be deployed with a combination of heterogeneous components within a dynamic network. Seaware supports the RTPS (Real Time Publish Subscribe) protocol, underwater acoustic modems and other forms of network transport. This paper gives an overview of Seaware's implementation and its application to multi-vehicle networked systems.
Workshop on Distributed Object Computing for Real-time and Embedded Systems, July 2008
Abstract: To build distributed applications using DDS for large scenarios typically involves a big number of individual processes running on many computers spread on the network. In our work, we propose a new approach for defining, configuring, and deploying DDS applications. Instead of a programmatic approach, our system is based on XML. We show how to define a flexible XML-based language to describe the DDS entities and their associated QoS, as well as how they should be deployed on the network. In addition, we will report preliminary tests and lessons learned in using this new methodology.
If you have a paper you would like to submit for inclusion, please email us at info@rti.com.
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