Abstract: Shell transfer arm is a complicated mechatronic and hydraulic integrated system of howitzer with multi-parameters. During the modeling process, some parameters are hard or unable to be measured but have significant effect on the performance of shell transfer arm, which can only be achieved by identification. For identifying the parameters of shell transfer arm, the dynamic and control models are built in Simulink, and the uncertainty parameters are described by interval number. The identification problem of interval uncertainty parameters is transformed into a certainty optimization problem via order relation of interval number transformation model. The similarity of angular velocity of shell transfer arm is set as the optimization objective function, and three parameters are identified by differential evolution (DE) method. The proposed method is verified by simulated and test data. The identification results of simulated data show that the identification accuracy satisfies the requirement, and the identification results of test data show that the proposed method is feasible and effective. Key

Key words: ordnancescienceandtechnology, howitzer, shelltransferarm, parameteridentification, intervaloptimization, similarityanalysis, differentialevolutionmethod