B. Jacquier, P. Vacher, S. Leroy, D. Walker

DOI Number: N/A

Conference number: IFASD-2015-095

The certification of a new aircraft requires the modal analysis of the aircraft in a great number of flight conditions. However both the environmental conditions in which these tests are performed and the requirements for the processing algorithms are very specific as compared to conventional modal analysis. Namely, very short excitation signals like pulses are now used to reduce the duration and therefore the cost of the flight tests. In order to cope with these unusual conditions, a specific modal analysis procedure was devised. It is based on a deterministic output-only identification approach. This procedure was developed in the framework of a research program in cooperation with Airbus. The goal was to develop a software to be implemented in the telemetry center for the near real-time processing of flight test data. The paper describes the specifications on the algorithms imposed by the operational context of flutter testing. It details the organization and the modules of the procedure designed to comply with these requirements. Modal analysis results are also presented both for Montecarlo benchmarks based on an elaborate aeroelastic model and for real flight test records.

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In Categories: 2. IFASD 2015, GVT & Flight Test
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