Based on innovative ultrasonic measurement technology, this future system will meet the requirements of the aerospace industry, as well as those of other industrial sectors (automotive, energy, etc.) where tightening control also represents a critical performance and safety issue.
A STRATEGIC CHALLENGE FOR THE RELIABILITY OF AEROspace ASSEMBLIES
In the aerospace sector, the fasteners preload is a critical parameter for guaranteeing the reliability of bolted assemblies. However, current control methods have their limitations:- Torque measurement cannot accurately estimate the preload, nor can it check the preload of a fastener that has already been installed,
- Ultrasonic measurement, while more reliable, is either costly and complex, or highly operator-dependent and therefore incompatible with industrial constraints.
(e.g. sensors glued to fasteners, coupling agents, etc.).
DIGIFAST: A PROJECT BUILT ON THREE YEARS OF COLLABORATIVE RESEARCH
DIGIFAST is a continuation of LISI AEROSPACE's R&D program, “SMART FASTENERS”, launched in 2022, financed as part of the French stimulus plan, with the support of CORAC and the DGAC, and the collaboration of numerous partners including Cetim and CEA. This program explored several technological approaches, including an innovative solution based on an external sensor with an integrated dry coupling agent, enabling reliable measurement without human interaction or contact gel.The DIGIFAST project marks a new stage: it aims to validate the robustness of this technology in representative industrial environments, and to prepare for its industrialization.
WORKING TOGETHER TO DEVELOP A BREAKTHROUGH TECHNOLOGY
DIGIFAST will enable these advances to be structured within a collaborative framework with Cetim, which has been called on for its knowledge and understanding of the clamping phenomenon for broad sectoral applications, and for its recognized know-how in industrialization. Engineers and technicians from the Carnot-accredited Technical Center will bring their expertise in experimental validation, modeling and the development of robust methodologies to qualify the performance of the future system in a representative semi-industrial test environment.A SHARED INDUSTRIAL AND SCIENTIFIC AMBITION
The main objective of DIGIFAST is to design, test and ensure the reliability of a prototype preload measurement system, with a view to increasing technological maturity from TRL 3 to TRL 6 by 2027.At the end of the project, LISI AEROSPACE aims to deploy this solution on a large scale on its products, and to launch the commercialization of the measurement and control system. As part of its knowledge transfer mission, Cetim plans to promote the results and methodologies deployed through scientific publications, standardization projects and support for other industrial sectors where assembly issues are critical.
