PLiMoS, a DSML to Reify Semantics Relationships: An Application to Model-Based Product Lines

In the Model-Based Product Line Engineering (MBPLE) context, modularization and separation of concerns have been introduced to master the inherent complexity of current developments. With the aim to exploit e ciently the variabilities and commonalities in MBPLs, the challenge of management of dependencies becomes essential (e.g. hierarchical and variability decomposition, inter-dependencies between models). However, one may observe that, in existing approaches, relational information (i) is mixed with other concerns, and (ii) lacks semantics and abstraction level identi cation. To tackle this issue, we make explicit the relationships and their semantics, and separate the relational concern into a Domain Speci c Modeling Language (DSML) called PLiMoS. Relationships are treated as rst-class entities and quali ed by operational semantics properties, organized into viewpoints to address distinct objectives, e.g. product derivation, variability consistency management, archi- tectural organization. This paper provides a description of the PLiMoS relationships de nition and its implementation in a model-based product line process using two variability languages: Feature Model and OVM. The independence with variability and core assets modeling languages provides bene ts to cope with the product line maintenance

ECONOMIC ASSESSMENT OF PRODUCT LINE ARCHITECTURE IN AIRSHIP DESIGN USING MODEL-BASED SYSTEMS ENGINEERING

As anti-submarine warfare (ASW) operations become increasingly complex and expensive, new platforms are required to enhance detection, tracking, and engagement capabilities while maintaining cost efficiency. This proposal presents a modular and scalable ASW airship combat system, leveraging model-based product line engineering (MBPLE) to optimize design, integration, and sustainment. The proposed airship will incorporate sonar systems, sensor suites, and weapons payloads, utilizing product line engineering (PLE) principles to enable component reuse and mission-specific customization. To assess the feasibility and economic benefits of the ASW airship, a detailed reused model based on the Constructive Product Line Investment Model (COPLIMO) was applied to evaluate cost savings, development efficiency, and return on investment (ROI). This approach quantifies the financial impact of component reuse across multiple airship variants, demonstrating how the product line strategy reduces lifecycle costs. Sensitivity analysis was conducted to assess how modifications in relative cost of development for reuse (RCDR) impact ROI, ensuring that cost-effectiveness is maintained across varying operational requirements. This research offers a methodology and adapts COPLIMO aimed at the design of airship ASW systems, while also setting a new foundation for further exploration in ASW system product line engineering.Distribution Statement A. Approved for public release: Distribution is unlimited.Lieutenant, United States Nav

Pattern-Based Systems Engineering (PBSE) - Product lifecycle Management (PLM) integration and validation

Mass customization, small lot sizes, reduced cost, high variability of product types and changing product portfolio are characteristics of modern manufacturing systems during life cycle. A direct consequence of these characteristics is a more complex system and supply chain. Product lifecycle management (PLM) and model based system engineering (MBSE) are tools which have been proposed and implemented to address different aspects of this complexity and resulting challenges. Our previous work has successfully implemented a MBSE model into a PLM platform. More specifically, Pattern based system engineering (S* pattern) models of systems are integrated with TEAMCENTER to link and interface system level with component level, and streamline the lifecycle across disciplines. The benefit of the implementation is two folded. On one side it helps system engineers using system engineering models enable a shift from learning how to model to implementing the model, which leads to more effective systems definition, design, integration and testing. On the other side the PLM platform provides a reliable database to store legacy data for future use also track changes during the entire process, including one of the most important tools that a systems engineer needs which is an automatic report generation tool. In the current work, we have configured a PLM platform (TEAMCENTER) to support automatic generation of reports and requirements tables using a generic Oil Filter system lifecycle. There are three tables that have been configured for automatic generation which are Feature definitions table, Detail Requirements table and Stakeholder Feature Attributes table. These tables where specifically chosen as they describe all the requirements of the system and cover all physical behaviours the oil filter system shall exhibit during its physical interactions with external systems. The requirement tables represent core content for a typical systems engineering report. With the help of the automatic report generation tool, it is possible to prepare the entire report within one single system, the PLM system, to ensure a single reliable data source for an organization. Automatic generation of these contents can save the systems engineers time, avoid duplicated work and human errors in report preparation, train future generation of workforce in the lifecycle all the while encouraging standardized documents in an organization

Integrating life cycle assessment in model-based systems engineering

The emergence of smart products has led to the development of an increasing number of multidisciplinary systems. For the successful development of such systems, a holistic approach is necessary, such as model-based systems engineering (MBSE). It is argued that certain product development activities could be integrated and improved with MBSE, one such activity being the assessment of environmental impacts. This article presents a case study on the usage of Life Cycle Assessment (LCA) on a MBSE system model. In the study a technical system is modelled with views according to the MagicGRID approach. The scope and goal of the LCA are defined by using SysML diagrams and elements. Additionally, different system variants are modelled to explore the capability of comparing LCA studies. At the end of the case study, the benefits, limitations, and shortcomings of the integration are discussed

The Spacecraft Early Analysis Model:An MBSE Framework for Early Analysis of Spacecraft Behavior

Model-based systems engineering (MBSE) represents a move away from the traditional approach to systems engineering. MBSE has the potential to promote consistency, communication, clarity and maintainability within systems engineering projects. MBSE also has the potential to address one of the well-known issues of the systems engineering process—the late discovery of errors or design faults. In this article, the development of the “Spacecraft early analysis model” (SEAM) is detailed and the current version is presented. The SEAM is a model-based framework developed by the authors to define, execute and analyze spacecraft structure and behavior during preliminary design. The SEAM comprises multiple modules (Project, Requirements, Mission, System, Operations) that enable the definition of the spacecraft and its supporting systems, and enables each to be updated independently. The SEAM incorporates a novel behavioral pattern that structures the modes and functions of the spacecraft using state machines and activities. Using this pattern, the behavior itself is not prescribed, as is common in similar model-based representations of spacecraft. The user defines individual functions and modes, and the user then simulates the behavior of the spacecraft in response to a concept of operations. In this article, the need for the SEAM, the development approach, the SEAM composition and the limitations of the SEAM are presented and discussed

Seasonal Habits and Habitat of the Ruffed Grouse in the Wellsville Mountains, Utah

The ruffed grouse (Bonasa umbellus incana) inhabits much of the deciduous woodland of northern and central Utah. Its distribution is confined mainly to the Wasatch and Uinta mountain ranges. It has been observed in willows (Salix spp.) at 5, 000 feet elevation and in Douglas-fir (Pseudotsuga menziesii) at 9,000 feet

An Approach for Linking Heterogenous and Domain-Specific Models to Investigate Cabin System Variants

This paper presents an approach to link heterogeneous and domain-specific models. The background of this research is the complete investigation and comparison of cabin system variants, where many different aspects have to be represented. These include functional requirements, safety regulations, and geometric properties (e.g. installation space). However, these cannot always be validated or represented with just one model, as different levels of detail are required. Therefore, different discipline models have to be created, which in turn increases the complexity as a whole. Furthermore, the system to be represented by the models, such as the aircraft cabin, is already complex in itself. The many dependencies among each other and subsystems make it difficult to integrate new variants or technologies (e.g. liquid hydrogen) into the existing system architecture. The approach presented here therefore shows how the data and models of the different disciplines can interact with each other in order to be able to investigate variants holistically. This is demonstrated using the design of hatrack variants for a commercial aircraft

The Wooster Voice (Wooster, OH), 1996-04-19

Homemade explosions disturbed Holden Hall on campus over the weekend. Anyone with information is invited to step forward. The director of the Peace Corps applauds \u27Generation X\u27 for their great work in humanitarian services and foreign aid. New editors were recently appointed at student publications across campus, including the Goliard and the Voice. A viewpoint piece urges student to find other fun activities on campus aside from the internet. AIDS memorial quilts, an art piece helping to remember the victims of AIDS, have come to Wooster. On page 9 there is a large advertisement for a Macintosh computer. The final three pages are dedicated to sports updates.https://openworks.wooster.edu/voice1991-2000/1142/thumbnail.jp

Processes, methods and tools supporting the development of aeronautical systems

Various processes, methods and tools are needed to support the development of new aeronautical systems. Those should cover the whole life-cycle, from the definition of stakeholders to system design and optimization, manufacturing and, eventually, end of life. Since years, the Digital Development Process group at the German Aerospace Center (DLR) is doing research on processes, methods and tools supporting and enhancing the development of new systems. Some of them are taken from the literature, others are developed by the research group. This paper presents an overview of these processes, methods and tools, highlighting how they can support and improve the main activities of a system development process