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Fundamental studies for development ...

Chen, Jianzhong.

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Fundamental studies for development of real-time model-based feedback control with model adaptation for small scale resistance spot welding.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Fundamental studies for development of real-time model-based feedback control with model adaptation for small scale resistance spot welding./
Author:	Chen, Jianzhong.
Description:	170 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0486.
Contained By:	Dissertation Abstracts International66-01B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3160823
ISBN:	0496947044

Fundamental studies for development of real-time model-based feedback control with model adaptation for small scale resistance spot welding.
Chen, Jianzhong.

Fundamental studies for development of real-time model-based feedback control with model adaptation for small scale resistance spot welding. - 170 p.

Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0486.

Thesis (Ph.D.)--The Ohio State University, 2005.

Small scale resistance spot welding (SSRSW) is extensively used in electronic and biomedical devices manufacturing. The process has its own features that are quite different from normal scale RSW process. These features bring difficulties in the reliable monitoring and control of the process. A real-time model-based feedback control with model adaptation has been proposed for the quality assurance of the process. Several aspects of the model were studies.

ISBN: 0496947044Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Fundamental studies for development of real-time model-based feedback control with model adaptation for small scale resistance spot welding.
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100 1 $a Chen, Jianzhong. $3 1908183
245 1 0 $a Fundamental studies for development of real-time model-based feedback control with model adaptation for small scale resistance spot welding.
300 $a 170 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0486.
500 $a Adviser: Dave F. Farson.
502 $a Thesis (Ph.D.)--The Ohio State University, 2005.
520 $a Small scale resistance spot welding (SSRSW) is extensively used in electronic and biomedical devices manufacturing. The process has its own features that are quite different from normal scale RSW process. These features bring difficulties in the reliable monitoring and control of the process. A real-time model-based feedback control with model adaptation has been proposed for the quality assurance of the process. Several aspects of the model were studies.
520 $a Monitoring is the first step for a successful control. An optical sensor was used for workpiece thickness and electrode displacement measurement. A load cell was placed at the bottom of lower electrode seat to record the clamping and change of clamping force in welding. The welding current and voltage were also measured. From these signatures it is an easy task to monitor the occurrence of expulsion in the process. The weld nugget size can also be related to electrode displacement. Specifically, through observing the electrode separation using a high-speed video camera, it is confirmed that the nugget size is more closely related to high-speed part of the electrode displacement curve. The way the optical sensor was implemented introduced measurement noise. However, the true displacement can be recovered by identification of the sensor holder system model followed by feeding of measured displacement to this model. This way a reliable displacement measurement was obtained that is suitable for the utilization of a real-time control.
520 $a The interaction between the primary process and the welding machine affects welding quality. Future real-time control must consider this interaction, because this interaction also influences the measured value of the process variables. A more flexible machine will allow the electrodes to separate more under the pushing force of heated materials than a more rigid welding machine. Due to the interaction between different part of welding machine and the primary process, some measurable process variables might not be independent to each other.
520 $a Analytical heat transfer model for the process was constructed using a one- and two-dimensional formulation. Temperature field and history were obtained.
520 $a Finally, future scope is projected in the development of the proposed control for SSRSW process.
590 $a School code: 0168.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
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690 $a 0548
710 2 0 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 66-01B.
790 1 0 $a Farson, Dave F., $e advisor
790 $a 0168
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3160823