Abstract
The loads acting on rapid maneuver aircrafts are characterized by high accelerations, high jerks and multiple directions in the space. The flight simulation tests for aircraft loads are usually carried out on a three-axis centrifuge. Due to the difference between flight and centrifugal environments, the loads in the simulation tests are not completely consistent with those in the actual flight environment. To verify that the dynamic responses of aircrafts in the three-axis centrifuge can be used to predict the responses in the flight environment, a beam installed in the three-axis centrifuge is considered. The velocity and acceleration models of the beam are established by the motion synthesis method. The rigid-flexible coupling dynamic equations of the beam are derived using the Kane’s method. Under different flight accelerations, the dynamic responses of beam in the three-axis centrifugal environment are simulated, which agree well with the responses in the flight environment. Besides, the influence of accelerations and jerks on the responses is analyzed. The results of this paper demonstrate that the present dynamic model can be used effectively to predict the experimental results in flight environments.
Highlights
With the rapid development of the aerospace technologies, greater maneuverability of aircrafts are required, which results in that aircrafts bear three-dimensional and high accelerations with high change rates
In the field of dynamic flight simulation tests, Sinapius [2] used modal force synthesis techniques to determine the test load to ensure that the test results reflect the actual flight conditions
The dynamic equations of the beam are established with which the dynamic flight simulation is performed
Summary
With the rapid development of the aerospace technologies, greater maneuverability of aircrafts are required, which results in that aircrafts bear three-dimensional and high accelerations with high change rates (jerks). Chen [3], Han [4] and Qiu [5, 6] et al performed dynamic flight simulation tests on different vibration platforms that can provide accelerations in three directions These vibration platforms are not able to provide sustained acceleration levels due to the stroke limitation of the prismatic actuation devices. This means that the simulation accelerations and the flight accelerations are not exactly the same. The obtained results indicate that only the accelerations of the key point in the centrifugal environment are the same with that in the flight environment, the dynamic flight simulation in the three-axis centrifuge can be used to predicate the flight responses effectively
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