Research on dynamic performance verification method for propulsion system of airship

Near space airship running at, because the air density of the ground is about fourteen times that of 20 km altitude, because of torque overrun, on the ground, propulsion system can't go to rated speed of the high altitude, the dynamic characteristics of propulsion system can't accurate measurement; On the other hand, the dynamic characteristics is an important index of propulsion system performance, is also the most notable problems in the study. There are three kinds of validation methods for propulsion system dynamic characteristics: the dynamic numerical simulation, the load simulator validation method and the full-size truck-mounted testing system. This three methods form a kind of arrangement in validation of progressive way, it makes the results of the validation gradually close to the real system. It is the full-size truck-mounted testing that propulsion system is partial validated of the ground speed range, due to the limitation of the system complexity and length in this paper, it requires special topic and this paper focus the others. According to rotational speed and torque balance between motor and propeller propulsion system, simulation model is built in Matlab/Simulink, and some simulation case is validated; then joining the load simulator to the motor output shaft under test, and testing the propulsion system property for deceleration or a sudden wind resistance, Semi physical simulation analysis was carried on. The results show that numerical simulation and full-size truck-mounted testing system have important reference value, in the research and evaluation of the system dynamic characteristics.