Development of Nonlinear Model and Implementation of Real-Time Flight Simulation of A Flexible Projectile in Simulink Environment For Initial Design and Stability Analysis

Flight simulation is an efficient tool in testing, evaluation and validation of aircrafts' design by observing flight parameters and predict the results of field tests in order to evaluation of design; in this regard for designing a flexible projectile, a nonlinear model is developed and also is simulated by implementing it in the simulink environment; in this way, the role of some design parameters or inputs such as: structure's natural frequencies, maneuvering acceleration, propulsion curve, initial or inherent misalignment or deflection of propulsion, angular velocities especially spinning velocity etc. has been examined. by comparing flexible projectile flight simulation or so-called elastic flight simulation to the rigid flight simulation, on issues such as flight behavior, trajectory and collision accuracy, propulsion curve and its initial errors, spinning velocity, effect of the control commands etc., elastic model gives more accurate, reasonable and realistic answer; however, in issues such as the study of the effect of aerodynamic load distribution, stiffness and inertia distribution, structure’s natural frequency, etc. only simulations based on elastic model will be able to respond. accordingly, the main orientation of this research is to develop a model and software tool in order to flight simulation of flexible projectile with acceptable accuracy and high run speed to achieve some of the mentioned goals; however, due to the extent variety of input parameters and their interaction, in this study, only initial misalignment & deflection of propulsion, spin velocity and structure’s natural frequency is covered and other cases will be examined in future studies.