Transactions of Nanjing University of Aeronautics & Astronautics
Research on Turning Characteristics of Helicopter Ground Motion
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Abstract:
In the passive turning state， the helicopter turns through the tail rotor force and the friction of the ground to the tire. In practice， it is found that the helicopter will turn difficultly under low aircraft ground speed or static state. This paper takes a certain type of helicopter as the research object， and establishes the dynamic model of helicopter ground turning motion based on the basic theory of dynamics. This model takes into account the six-degree-of-freedom motion model of the helicopter body， the motion model of the landing gear buffer， the tire mechanics model and the friction characteristics of the strut friction disc. The dynamic simulation of the helicopter right angle turn and static turn is carried out， and the influence of parameters such as tail rotor pull， taxi speed， tail wheel stability distance on the dynamic response of the turn is studied. The results show that under the same ground taxing speed， the tail wheel angle increases with the increase of tail rotor force. When the tail rotor force is the same， the tail wheel angle increases with the increase of ground taxing speed. When the helicopter is completely static， it is the most difficult to turn， which requires much bigger force of the tail rotor to turn. In addition， the change of the stability distance of the tail wheel has an obvious influence on the turning. When the stability distance is doubled， the tail rotor force will be reduced by 30% to the same angle of the tail wheel.
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Project Supported:
This work was supported in part by the Fundamental Research Funds for the Central Universities （No.NP2022416） and the Aeronautical Science Foundation of China（No. 20180627210315）.
Clc Number:
V226
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