Robust Controller for the Suppression of Chatter in Precision Machining
碩士 === 逢甲大學 === 自動控制工程所 === 96 === Chatter is a self-excited vibration during machining that causes violent vibration between the tool and the workpiece. Chatter degrades surface finish, causes wear or breakage of tools and limits the material removal rate. This phenomenon is more conspicuous on sle...
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ndltd-TW-096FCU051460292015-11-27T04:04:43Z http://ndltd.ncl.edu.tw/handle/01056180570385986200 Robust Controller for the Suppression of Chatter in Precision Machining 精密加工顫振抑制強健控制器設計 Chung-Wey Wu 吳仲偉 碩士 逢甲大學 自動控制工程所 96 Chatter is a self-excited vibration during machining that causes violent vibration between the tool and the workpiece. Chatter degrades surface finish, causes wear or breakage of tools and limits the material removal rate. This phenomenon is more conspicuous on slender workpiece. Therefore, the ability to suppress chatter can improve machining performance significantly. In this study, the chatter suppression problem is investigated for slender workpieces in turning. A tool holder driven by a piezoelectric actuator is designed and controlled. Based on the H∞ controller may change the chip width dynamically by controller signal voltage for chatter suppression in the turning process. Experimental modal analysis and ANSYS finite-element modal analysis are carried out for obtaining accurate frequency response functions of the workpiece and the cutting tool for designing controllers. According to the chatter theory, the happening of chatter has important relation to the structure’s dynamic transfer function of the workpiece and cutting tool. Based on the model matching conception and applied H∞ control theory to design a controller to have the higher critical stabile value of the structure’s dynamic transfer function. The performance of controller is tested first in a simulative environment, then an experimental structure is built by utilizing dSPACE, include of the real cutter and the computer-modelling workpiece and cutting status. To proceed with the machining experiment, the lathe was refitted to mount the piezo-actuated tool holder. Compared with the results of cutting by traditional tool holder and uncontrolled piezo-actuated tool holder and controlled piezo-actuated tool holder under the same cutting condition, to make sure the H∞ controller possess the ability of chatter suppress effectively. Jiann-Lih Hwang 黃建立 2008 學位論文 ; thesis 65 zh-TW |
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zh-TW |
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碩士 === 逢甲大學 === 自動控制工程所 === 96 === Chatter is a self-excited vibration during machining that causes violent vibration between the tool and the workpiece. Chatter degrades surface finish, causes wear or breakage of tools and limits the material removal rate. This phenomenon is more conspicuous on slender workpiece. Therefore, the ability to suppress chatter can improve machining performance significantly.
In this study, the chatter suppression problem is investigated for slender workpieces in turning. A tool holder driven by a piezoelectric actuator is designed and controlled. Based on the H∞ controller may change the chip width dynamically by controller signal voltage for chatter suppression in the turning process.
Experimental modal analysis and ANSYS finite-element modal analysis are carried out for obtaining accurate frequency response functions of the workpiece and the cutting tool for designing controllers.
According to the chatter theory, the happening of chatter has important relation to the structure’s dynamic transfer function of the workpiece and cutting tool. Based on the model matching conception and applied H∞ control theory to design a controller to have the higher critical stabile value of the structure’s dynamic transfer function. The performance of controller is tested first in a simulative environment, then an experimental structure is built by utilizing dSPACE, include of the real cutter and the computer-modelling workpiece and cutting status. To proceed with the machining experiment, the lathe was refitted to mount the piezo-actuated tool holder. Compared with the results of cutting by traditional tool holder and uncontrolled piezo-actuated tool holder and controlled piezo-actuated tool holder under the same cutting condition, to make sure the H∞ controller possess the ability of chatter suppress effectively.
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author2 |
Jiann-Lih Hwang |
author_facet |
Jiann-Lih Hwang Chung-Wey Wu 吳仲偉 |
author |
Chung-Wey Wu 吳仲偉 |
spellingShingle |
Chung-Wey Wu 吳仲偉 Robust Controller for the Suppression of Chatter in Precision Machining |
author_sort |
Chung-Wey Wu |
title |
Robust Controller for the Suppression of Chatter in Precision Machining |
title_short |
Robust Controller for the Suppression of Chatter in Precision Machining |
title_full |
Robust Controller for the Suppression of Chatter in Precision Machining |
title_fullStr |
Robust Controller for the Suppression of Chatter in Precision Machining |
title_full_unstemmed |
Robust Controller for the Suppression of Chatter in Precision Machining |
title_sort |
robust controller for the suppression of chatter in precision machining |
publishDate |
2008 |
url |
http://ndltd.ncl.edu.tw/handle/01056180570385986200 |
work_keys_str_mv |
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