ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Kinematic Modeling and Testing of 3-Bearing Swivel Duct Nozzle
Received date: 2013-08-20
Revised date: 2013-10-26
Online published: 2013-11-16
Supported by
National Natural Science Foundation of China (60974339)
The 3-bearing swivel duct (3BSD) nozzle is the main form of large angle deflection. It is chiefly used on vertical and/or short take-off and landing (V/STOL) aircrafts. A 3-bearing swivel duct nozzle contains three ducts. The three ducts and the engine outlet are connected by three bearings thus forming three revolute pairs. The nozzles deflect to a desired angle and direction through the rotation of the revolute pairs. Kinematic modeling is the prerequisite of the design and application of a 3-bearing swivel duct nozzle. A kinematic model is built in this paper using coordinates transformation. Principles of the nozzle are presented through geometric analysis. The nonlinear relationship of the nozzle deflection angle/direction and rotation angles of the three revolute pairs is discussed. The inverse kinematic control law is given, based on three proposed assumptions, and tested on a scaled 3-bearing swivel duct nozzle. The experiment results show that the kinematics model reflects the kinematic behavior of the 3-bearing swivel duct nozzle precisely, and the inverse kinematic control law can be used for its open loop control.
WANG Xiangyang , ZHU Jihong , LIU Kai , ZHENG Yi . Kinematic Modeling and Testing of 3-Bearing Swivel Duct Nozzle[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(4) : 911 -920 . DOI: 10.7527/S1000-6893.2013.0448
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