EUROCAE ED 247
Technical Standard for Virtual Interoperable Simulation for Tests of Aircraft Systems in Virtual or Hybrid Bench
|Publication Date:||1 March 2020|
SCOPE OF THE DOCUMENT
Physical test benches used in the aircraft development process are complex platforms with high initial and recurring costs. They are generally on the critical path of the development and cannot be easily replicated to increase the validation capacity.
Virtual Testing can be one approach to avoiding these difficulties. It is a promising solution that has already demonstrated its benefits in other industries like Cell phone. However, in the avionics industry, it brings specific challenges as systems are complex, hardware heterogeneous and sourced from multiple suppliers with different infrastructures.
Therefore, an internationally recognized standard is necessary:
• To provide a framework to support the demonstration of the interoperability of virtual and real avionics components.
• To define a global process that describes the exchange, integration and exploitation of those components, their environments and connectivity.
A target of ED-247 rev. A is to address certification credits using virtual testing for V&V activities through the accumulation by industry of experience confirming the representativeness and reliability of this virtualization approach.
This document aims to standardize:
• The "Virtual and hybrid testing" approach through the integration of virtual and hybrid test bench components;
• The interfaces (virtualization rules for the different A/C signals and buses, commands, etc.) between virtual and hybrid components;
• The hybridation (mix of real and virtualized components);
• The exchange process between provider and integrator of components compliant with this standard.
Virtual testing within the scope of this standard is targeted at aircraft system development and V&V. It is convenient to have in mind IMA architectures when considering this approach. However, there is no counter-indication for using it across all kind of computer based systems embedded in the aircraft, commonly called Line Replaceable Unit (LRU).
Other components are considered as virtual and their classifications/defi
With respect to interface standardization between components, the use of a specific physical layer is not enforced by this document although Ethernet UDP/IP is currently considered as the de facto reference implementation throughout the document. It must be taken as an example and not a hard requirement.
This document is organized as follows:
• CHAPTER 1 introduces the intended use and added value of Virtual and hybrid testing as well as the objectives and perimeter of this document,
• CHAPTER 2 describes the ED-247 Concepts,
• CHAPTER 3 explains the implementation of transversal concepts of the ED-247 standard,
• CHAPTER 4 explains the implementation of each avionic and non-avionic protocol into the ED-247 frame,
• CHAPTER 5 is reserved for future extension of the standard.
Virtual components in this document are considered as "black boxes" and the emphasis is made on the exchanges that must respect the ICDs defined for the real components and their interfaces with the Virtual Test Bench (VTB).