US 12,241,732 B2
Device and method for automatically detecting through-hole rate of honeycomb sandwich composite-based acoustic liner
Jun Wang, Nanjing (CN); Zhongde Shan, Nanjing (CN); Hao Tang, Nanjing (CN); and Yuanpeng Liu, Nanjing (CN)
Assigned to NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS, Nanjing (CN)
Filed by NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS, Nanjing (CN)
Filed on Mar. 23, 2022, as Appl. No. 17/701,763.
Prior Publication US 2022/0214159 A1, Jul. 7, 2022
Int. Cl. G01B 11/22 (2006.01); B25J 9/16 (2006.01); B25J 13/08 (2006.01); G01B 11/08 (2006.01)
CPC G01B 11/22 (2013.01) [B25J 9/1661 (2013.01); B25J 9/1664 (2013.01); B25J 13/087 (2013.01); B25J 13/088 (2013.01); G01B 11/08 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for automatically detecting a through-hole rate of a honeycomb sandwich composite-based acoustic liner using a device for automatically detecting a through-hole rate of a honeycomb sandwich composite-based acoustic liner, the device comprising:
a customized tooling;
a data acquisition system;
a motion mechanism; and
a data processing system;
wherein the data acquisition system is configured to acquire a three-dimensional (3D) point cloud data of a surface of an acoustic liner; the data acquisition system comprises a two-dimensional (2D) laser profile sensor and a controller; the 2D laser profile sensor is configured to collect the 3D point cloud data of the surface of the acoustic liner by parallel movement shooting; and the controller is configured to be connected with a graphics workstation to input an acquired 3D point cloud data for subsequent processing;
the motion mechanism is configured to support the data acquisition system to perform translational scanning; the motion mechanism comprises an industrial robot with six degrees of freedom; an end of the industrial robot is capable of moving according to a path designed by an offline programming software; and the 2D laser profile sensor is fixed at the end of the industrial robot;
the data processing system comprises the graphics workstation; the data processing system is configured to play a role of path planning and data storage in a data acquisition process, and output a detection result through an improved algorithm; and
the customized tooling is designed according to a mounting hole of the 2D laser profile sensor and a mounting hole of the end of the industrial robot to enable a position and angle of the 2D laser profile sensor relative to the end of the industrial robot to be fixed;
the method comprising:
(S1) acquiring, by the device, a 3D point cloud data of the acoustic liner;
(S2) detecting a spatial distribution of the 3D point cloud data, and preprocessing the 3D point cloud data to partially filter noise point clouds, and remove a hole bottom data;
(S3) detecting a main plane where a micro-hole is located; identifying a boundary point cloud of the micro-hole based on a neighborhood calculation method by analyzing a pattern of the micro-hole, and extracting a relevant point; and
(S4) subjecting the boundary point cloud to clustering segmentation; calculating a diameter of an actual hole and a hole center coordinate of the actual hole through a circle fitting algorithm based on geometric fitting, and searching the hole bottom data in an original data along a direction of the main plane to get an accurate quality detection result.