The “Model Architecture and Interfaces Recommended Practice for Ground Vehicle System and Subsystem Dynamical Simulation” defines the architectural structure of a ground vehicle system dynamical model by partitioning it into subsystem models and by defining subsystem interfaces required to enable plug-and-play operation of a dynamical simulation models. All types of ground vehicle were considered in the development of the architecture, such as, passenger cars, light and medium duty trucks, heavy duty tractor trailer trucks, and vehicles/equipment for military, farming, construction, and mining. Versatility of this architectural partitioning is demonstrated by showing how it can be applied to different vehicle configurations. Application examples of architecture are provided for a large number of the publicly known ground vehicle configurations in production, testing, or development.
This recommended practice encompasses standards to enable seamless plug-and-play reusability of dynamical models for simulating the functional behavior of a ground vehicle system and its subsystems. A single ground vehicle system is the system of interest. The architecture and interfaces support vehicle models that describe vehicle motion in one dimension (longitudinal), two dimensions (longitudinal and lateral or longitudinal and vertical), and three dimensions (longitudinal, lateral, and vertical). The scope includes defining recommended practices for:
1
Model architectural structure, and interfaces that enable the plug-and-play development of: (1) a top-level ground vehicle system model from subsystem models, and (2) subsystem models from other subsystem models; and
2
Model architecture and interfaces for all hardware and controller interfaces; however, the internal structure of control algorithms and software will not be included in this recommended practice.
Since, other groups (such as, AUTOSAR) are addressing architecture and interfaces of models for control applications and software; they are not included in the scope of the recommended practice. However, in the future, the internal structure of control algorithms and software should be addressed for special issues of dynamical modeling and simulation of ground vehicle systems that are not covered by other standards groups.
Rationale
Increasingly, global vehicle engineering teams span domains of engineering and physics within organizations and include external collaborations between commercial businesses (original equipment manufacturers (OEMs), and suppliers), government agencies, and research institutions. For increased efficiency, reduced costs, faster design iterations, and fewer hardware prototypes, these teams use math-based engineering methods to build and test virtual ground vehicles in simulation environments. These types of inter-organizational engineering collaborations require a common shared simulation model for an entire ground vehicle system and/or the related subsystems of which it is composed. Use of dynamical modeling and simulation for virtual engineering development and testing of the functional performance of ground vehicles by inter-organizational teams has increased and resulted in a need for standardizing the architecture and interfaces of a ground vehicle system model by partitioning it into subsystem models to enable plug-and-play of subsystem simulation models. A standardized ground vehicle system model with an architectural structure partitioned into subsystem models, and with defined subsystem model interfaces enables: (1) model reuse, (2) division of modeling tasks across multifunctional teams, (3) parallel model development, verification and validation, and (4) rapid and efficient integration of subsystem models for reduced development time and costs.
The recommended practice for model architecture and interfaces will: (1) create a common language, (2) increase productivity of processes, (3) promote uniform testing, (4) permit common interfaces, and (5) reduce costs.
Background Need: Complexity of automotive systems (as used in passenger cars, heavy duty trucks, military vehicles, and agricultural and construction equipment) is increasing at a rapid rate along with competitive pressures to reduce product development cycle times. Development of these modern automotive systems requires highly coordinated collaboration across several disciplines of engineering and physics within organizations, and between a network of OEM’s, suppliers, research laboratories and universities across the industry and around the globe. To keep up with technology change and competitive pressures, these global teams need virtual engineering methods for responsive, cost effective and efficient collaborative development.
The future development of automotive systems will continue to be driven by the same forces and trends that they experience today. These factors will require continual improvements in terms of higher fuel efficiency, higher quality and reliability, lower emissions, and improved safety, while providing more value to the customer at a lower cost. To minimize costs and time, systems will be developed by global teams collaborating across an industry network using virtual engineering processes and methods with minimal physical builds required only to confirm designs and performance. Virtual engineering of automotive systems will require dynamical modeling and simulation (DM&S) using the integration of models from different companies and disciplines with varying levels of abstraction (fidelity and complexity). Additionally, DM&S is a critical enabler for an integrated development process needed to establish seamless and efficient flows of new technologies from research to production.
In order to make global enterprise and cross-enterprise virtual engineering methods cost effective, efficient and robust, automotive industry wide standards for dynamical modeling and simulation are required.
Objective: The objective of the committee is to establish modeling and simulation standards to facilitate dynamical modeling and simulation of automotive systems. These standards will facilitate integrated and multidisciplinary virtual engineering processes for highly coordinated and collaborative engineering work. SAE Standards, Recommended Practices and Information Reports (standards) will be established and published to facilitate and promote cost effective, efficient and robust: 1) model and data sharing and reuse, 2) seamless modeling, simulation and analysis workflows, 3) virtual engineering processes, 4) modeling and simulation tool interoperability, 5) model portability across simulation tools, and 6) verification and validation.
Scope: The committee’s activities will develop standards for dynamical models and simulations that mathematically describe an automotive system’s time varying response, behavior and interactions of subsystems and components. These standards will include processes, methods, performance metrics and analyses related to dynamical modeling and simulation of automotive systems. The focus is on standards to make models reusable and simulation results predictable and repeatable across engineering and physics disciplines, application tools, and the automotive industry.
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Model Architecture and Interfaces Recommended Practice for Ground Vehicle System and Subsystem Dynamical Simulation
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Model Architecture and Interfaces Recommended Practice for Ground Vehicle System and Subsystem Dynamical Simulation
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