公开(公告)号：US20240034463A1

公开(公告)日：2024-02-01

申请号：US18257610

申请日：2022-01-25

Applicant: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

Inventor： Yongjie SHI ,  Taihang MA ,  Zhiyuan HU ,  Guohua XU ,  Yang LIU

IPC: B64C27/00 ,  G10K11/178

CPC classification number: B64C27/001 ,  G10K11/17883 ,  G10K11/17875 ,  B64C2027/004 ,  B64C2220/00

Abstract: A helicopter active noise suppression device integrating a sound array and on-propeller control, which relates to the technical field of helicopter noise reduction, includes an annular loudspeaker array, a plurality of force exciters, an error microphone, an Active Noise Cancellation (ANC) controller, a cockpit sensor, and an airborne computer. The annular loudspeaker array is arranged at a rotor hub and unsteady force exciters are arranged at each blade trailing edge to construct a sound field in an reversed phase to the sound wave of an original sound field with an ANC principle, thereby counteracting the noise and realizing the noise reduction of all-domain and all-type helicopter noise.

公开(公告)号：US20240419874A1

公开(公告)日：2024-12-19

申请号：US18702840

申请日：2023-04-28

Applicant: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

Inventor： Zhiyuan HU ,  Yongjie SHI ,  Guohua XU ,  Yang LIU ,  Jiahao ZHU

IPC: G06F30/28 ,  G06F111/10 ,  G06F113/08 ,  G06T1/20

Abstract: A graphics processing unit (GPU)-based numerical simulation system and method for a helicopter flow field (FF). The GPU-based system includes a central processing unit (CPU) and a GPU. The CPU is configured to initialize a moving overset grid according to a preset configuration file and the mesh files of a to-be-simulated helicopter; determine face batch information according to mesh blocks in the moving overset grid; determine an overset interpolation relationship between the mesh blocks and an interpolation mapping index according to the mesh files at a current simulation moment; and perform FF information exchanging between the mesh blocks according to the overset interpolation relationship, the interpolation mapping index, and FF information of the mesh blocks, to obtain to-be-simulated helicopter FF information. The GPU computes the FF information of the mesh blocks in the motion nested mesh according to surface batch information by using a computational fluid dynamics (CFD) method.

公开(公告)号：US20220112584A1

公开(公告)日：2022-04-14

申请号：US17263876

申请日：2020-07-23

Applicant: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

Inventor： Dongdong GU ,  Kaijie LIN ,  Jingfeng QUAN ,  Yamei FANG ,  Qing GE ,  Jie ZHUANG ,  Yang LIU ,  Weisong DONG ,  Pengjiang SHUAI

IPC: C22C38/00 ,  B22F9/04 ,  B33Y70/00 ,  B23K26/00 ,  B23K26/342

Abstract: The present disclosure relates to a micron silver particle-reinforced 316L stainless steel matrix composite, including a 316L stainless steel matrix and silver particles uniformly distributed in the 316L stainless steel matrix. The silver particles have a weight 1% to 5% of the total weight of the composite; and the composite has a density of 7.9 g/cm3 to 8.2 g/cm3 and a relative density of more than 98%. The composite is prepared by the following method: mixing raw materials of a spherical silver powder and a spherical 316L stainless steel powder; subjecting a resulting mixture to mechanical ball milling to obtain a mixed powder; sieving the mixed powder and adding a resulting powder to a powder cylinder of an SLM forming machine; and charging an inert protective gas for printing to obtain the composite.