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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