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AcouFren : a design tool for railway brake squeal
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Project story
AcouFren was a collaborative project sponsored by ADEME (the french agency for energy and environment) and steered by the SNCF (the french railway agency) to improve the understanding of squeal occurrences as function of braking pad designs. The brake pad market is a multi-million EUR yearly market for the TGV only, in which noise performance specifications are tightening for environmental reasons. The squeal noise can indeed attain 120 dB in the bogie vicinity. The project involved several main actors in the domain from industry and academia, SNCF, Faiveley Transport, Alstom, Bombardier, IFSTTAR, ECL-LTDS, ENPC, Vibratec, and SDTools.
The main outcomes were a large experimental database and a software package developed by SDTools (see presentation of AcouFren software ). The software provides a complete simulation process from model generation to acoustic post-treatment, including
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![]() Railway brake ![]() Stability prediction and transient simulation |
Each step was interfaced through a Graphical User Interface (GUI), offering post-processing capabilities and automatic reporting.
The use of the latest SDT functionalities regarding data handling (advanced use of HDF5 and other out-of-core features), unsymmetric system resolution (interfacing of the latest PARDISO libraries from INTEL), Java GUI strategies, and formatted image caption strategies were exploited along with the latest SDT extensions on
The final software was packaged for industrial deployment using the MATLAB Compiler. A pre-computed database for the TGV and AGC brake models was built to allow optimized studies of brake pads effect on squeal.
Communications on the project
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