Halbach array generatormotor having an automatically regulated output voltage and mechanical power output. On 4 june 1996, the maiden flight of the ariane 5 launcher ended in a failure. Crystal clear ssi for operational modal analysis of. Abstract this report concerns my internship at eads astrium, in the a5 development mechanical loads section, between january 10 and july 8, 2011. Identification technology of modal parameter of a strapon.
Flexible body kinematics applied to the ariane 5 launcher. Crystal clear ssi for operational modal analysis of aerospace vehicles. It is used to deliver payloads into geostationary transfer orbit gto or low earth orbit leo german and french government agencies worked closely together to develop the ariane. The explosion of the ariane 5 university of minnesota. On june 4, 1996 an unmanned ariane 5 rocket launched by the european space agency exploded just forty seconds after its liftoff from kourou, french guiana. Distance between the two towers is 2000 mm and the model span is 4000 mm.
Ariane 5 s lower section consists of a cryogenic central main epc stage fueled by liquid hydrogen and liquid. Engineers from the ariane 5 project teams of cnes and industry immediately started to investigate the failure. Biomedical engineering education at politecnico di milano. The biomedical engineering bme programme at the polite. We consider the ariane 5 launcher with its usual equipment during a commercial flight under the natural unknown. Pdf crystal clear ssi for operational modal analysis of. Only about 40 seconds after initiation of the flight sequence, at an altitude of about 3700 m, the launcher veered off its flight path, broke up and exploded. We consider the ariane 5 launcher with its usual equipment during a commercial flight under the natural unknown excitation. The case of space launchers is a typical example of a complex structure with substructures strongly and quickly varying in time.
Ariane 5 is a european heavylift launch vehicle that is part of the ariane rocket family, an expendable launch system designed by the french government space agency centre national detudes spatiales cnes. In order to identify bending and torsional modes of the bridge model, 14 accelerometers were symmetrically placed on the bridge body and one shaker was used to give white noise excitation fig. Identification of nonstationary dynamical systems using. In this paper we revisit the problem of the modal analysis of space launchers. For example, the stochastic subspace identification ssi method is applied on a bridgelike structure on short time windows in and in a variant of this method the crystal clear ssi method is applied on flight data of the ariane 5 launcher to track the variation of its modal properties due to its decrease in mass with time.