The invention relates to a noise reduction system for a ductless propulsion rotor of an aircraft. The invention discloses a noise reduction system (140) for an aircraft. The noise reduction system comprises a cyclic pitch mechanism (108) arranged to apply a cyclic pitch stroke to rotor blades of a ductless propulsion rotor (UPR) (110) under the control of a processor (150). The processor receives input data corresponding to a position and attitude of the UPR, a position of one or more ground points stored in a memory (149), and a speed of the aircraft. If the processor determines that the ground point will enter the plane of the UPR, a control signal is output to the cyclic pitch mechanism as needed to adjust the phase of the cyclic pitch stroke, so that the azimuth angle position of the ground point entering the plane of the UPR is located within an azimuth angle interval in which the ground point enters the plane of the UPR. The blade pitch of the cyclic pitch stroke is lower than its average value, thereby reducing noise in the direction of the ground point.
本发明题为“用于飞行器的无管道推进式转子的降噪系统”。本发明公开了一种用于飞行器的降噪系统(140),该降噪系统包括循环螺距机构(108),该循环螺距机构被布置成在处理器(150)的控制下将循环螺距行程应用于无管道推进式转子(UPR)(110)的转子叶片。该处理器接收与该UPR的位置和姿态、存储在存储器(149)中的一个或多个地面点的位置以及飞行器的速度对应的输入数据。如果该处理器确定地面点将进入该UPR的平面,根据需要将控制信号输出到循环螺距机构以调整该循环螺距行程的相位,使得进入该UPR的平面的地面点的方位角位置位于方位角间隔内,在该方位角间隔内,该循环螺距行程的叶片螺距低于其平均值,从而降低该地面点方向上的噪声。
Noise reduction system for ductless propulsion rotor of aircraft
用于飞行器的无管道推进式转子的降噪系统
2021-09-07
Patent
Electronic Resource
Chinese
IPC: | B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT |
Aircraft equipped with distributed counter-rotating ductless fan propulsion system
European Patent Office | 2022
|Noise attenuation for an open rotor aircraft propulsion system
European Patent Office | 2017
|NOISE ATTENUATION FOR AN OPEN ROTOR AIRCRAFT PROPULSION SYSTEM
European Patent Office | 2017
|