Mr. Yueyang Du Profile

Yueyang Du

at Shanghai Jiao Tong Univ

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SPIE Journal Paper | 24 February 2012

Simple three-dimensional laser radar measuring method and model reconstruction for hot heavy forgings

Zhengchun Du, Yueyang Du

OE, Vol. 51, Issue 02, 021118, (February 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.2.021118

KEYWORDS: 3D modeling, 3D metrology, LIDAR, Sensors, Data modeling, Clouds, Tin, Servomechanisms, Cameras, Optical engineering

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Dimensional measurement of hot heavy forgings is desirable to permit real-time process control, but usually it is inconvenient because of the difficulty in working with very hot workpieces. We present a new three dimensional (3D) measuring approach based on a two-dimensional laser range sensor (TLRS). First, the measurement system is obtained by assembling a TLRS, an axis of rotation, and a servo motor, which rotates the scan plane of the laser ranger sensor and lets the TLRS scan forgings in different planes. Therefore, the coordinates of forging surface points can be obtained in a sensor coordinate system (SCS). According to the transformation matrix between the SCS and measurement coordinate system (MCS), coordinates of points in different SCSs can be transferred into one fixed MCS. Hence the actual 3D models of hot heavy forgings can be reconstructed by using a triangulated irregular network and be optimized by employing improved Delaunay rules. Different parameters of forgings, such as lengths and diameters, can be measured based on the 3D model. The new method is verified by experiments in both the laboratory and the forging workshop. The experimental results indicate that it is much more practical and convenient for the real-time, onsite measurement of hot heavy forgings.

Proceedings Article | 27 May 2011 Paper

Measurement system for hot heavy forgings and its calibration

Yueyang Du, Zhengchun Du

Proceedings Volume 8082, 80822Y (2011) https://doi.org/10.1117/12.889353

KEYWORDS: Calibration, Sensors, 3D modeling, Servomechanisms, Tin, Clouds, Data modeling, Cameras, Computing systems, 3D metrology

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Dimensional measurement of hot heavy forgings is desirable to permit real-time process control, but usually is inconvenient because of the difficulty in working with very hot workpieces. This paper presents an approach based on Two-dimensional Laser Range Sensor (TLRS). Firstly, the measurement system can be obtained by assembling TLRS, an axis of rotation, and a servo motor, which rotates and scans forgings in different planes. Then, the coordinates of points of forging's surface can be obtained in coordinate system in scanning plane. Secondly, the origin of Measurement Coordinate System (MCS) at the centre of rotation of TLRS can be located. According to the transformation between Sensor Coordinate System (SCS) and MCS, coordinates of points in different SCS can be transferred into the fixed MCS. Next, the final points of forging's surface in MCS can be obtained. Hence models of hot heavy forgings can be reconstructed by using Triangulated Irregular Network and optimized by employing Delaunay rules. Finally, different parameters of forgings, such as lengths and diameters, can be measured. In order to calibrate the measurement system, a pyramid is proposed to compute the transformation matrix between SCS and MCS based on the projective geometry theory. The new method has been verified by experiments in both the laboratory and the forging workshop. The experimental results indicate that it is much more practical for the real time on-site measurement of hot heavy forgings. This research lays a desirable foundation for the further work.

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