2026-09-19T14:41:42Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/167952022-01-13T07:54:39Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Nicholas M. Patrikalakis and Takashi Maekawa.
Andrade, Rodrigo V. (Rodrigo Victor), 1968-
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Ocean Engineering
2005-05-19T14:37:17Z
2005-05-19T14:37:17Z
2001
2001
http://hdl.handle.net/1721.1/16795
50406099
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
Includes bibliographical references (leaves 119-120).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Fabrication of pipes requires the use of several manufacturing processes, such as bending, welding, drilling and wringing. However, in most cases the circular ends deviate from true circles and need reformation to be welded to angles. Currently the reformation is conducted by hammering and relies on the intuition of skilled workers. This reforming process is not only expensive but also generates unhealthy loud noise. The objective of this research is to develop an automatic system of circularizing the ends of a deformed pipe by laser line heating. The overall problem is defined as follows: Given the design of a metal pipe, measure the shape of the cross sections of both ends and a branch end of the manufactured pipe and determine the heating paths together with the heating conditions to reform the manufactured pipe to within acceptable tolerances with respect to the designed pipe using the line heating method. The line heating conditions to be applied to the pipe have to be determined in real time to make the process ecient. A Neural Network is created for this purpose and the database used to run it is generated using a simplified thermo-mechanical model of the pipe validated by a Finite Element Model (FEM).
by Rodrigo V. Andrade.
S.M.
120 leaves
890136 bytes
889889 bytes
application/pdf
application/pdf
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Ocean Engineering.
Mechanical Engineering.
Pipe circularity reformation via line heating
Thesis
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<Abstract>Fabrication of pipes requires the use of several manufacturing processes, such as bending, welding, drilling and wringing. However, in most cases the circular ends deviate from true circles and need reformation to be welded to angles. Currently the reformation is conducted by hammering and relies on the intuition of skilled workers. This reforming process is not only expensive but also generates unhealthy loud noise. The objective of this research is to develop an automatic system of circularizing the ends of a deformed pipe by laser line heating. The overall problem is defined as follows: Given the design of a metal pipe, measure the shape of the cross sections of both ends and a branch end of the manufactured pipe and determine the heating paths together with the heating conditions to reform the manufactured pipe to within acceptable tolerances with respect to the designed pipe using the line heating method. The line heating conditions to be applied to the pipe have to be determined in real time to make the process ecient. A Neural Network is created for this purpose and the database used to run it is generated using a simplified thermo-mechanical model of the pipe validated by a Finite Element Model (FEM).</Abstract>
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