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Дисертації з теми "Chatter suppression"

Автор: Grafiati
Опубліковано: 10 березня 2023

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1

Zhang, Yuanming. "Piezoelectric damping for chatter suppression in high-speed milling." Thesis, University of Sheffield, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434511.

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2

Pratt, Jon Robert Jr. "Vibration Control for Chatter Suppression with Application to Boring Bars." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29344.

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Анотація:
A mechatronic system of actuators, sensors, and analog circuits is demonstrated to control the self-excited oscillations known as chatter that occur when single-point turning a rigid workpiece with a flexible tool. The nature of this manufacturing process, its complex geometry, harsh operating environment, and poorly understood physics, present considerable challenges to the control system designer. The actuators and sensors must be rugged and of exceptionally high bandwidth and the control must be robust in the presence of unmodeled dynamics. In this regard, the qualitative characterization
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3

Xu, Diancheng. "A fuzzy logic approach for chatter detection and suppression in end milling." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26351.

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Анотація:
In metal cutting processes, excessive vibration or chatter has an adverse effect on productivity and product surface quality. Various studies have been reported in the literature over the past few decades. However, the real application of the outcome of these studies has been very limited. A new system has been developed in this study for chatter detection and chatter suppression. The coherence function values of the frequency spectra from two accelerometers in orthogonal directions were used as a chatter indicator. The vibration energy was used to offset the over-vigilance behaviour of the co
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4

Wang, Lei. "Chatter detection and suppression using wavelet and fuzzy control approaches in end milling." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/27074.

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Анотація:
In metal cutting processes, chatter has been recognized as one of the main factors that limit machining productivity and affect product quality. Two different categories of chatter were classified by researchers, i.e., regenerative chatter and non-regenerative chatter, and in this thesis the former is mainly studied. Over the past few decades, though various chatter detection and suppression methods have been developed, their industrial acceptance is still very limited. This research work presents a new system for on-line chatter detection and suppression. Its detection module implements a sta
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5

Iglesias, Alex. "Milling stability improvement through novel prediction and suppression techniques." Doctoral thesis, Universitat de Girona, 2016. http://hdl.handle.net/10803/392143.

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Анотація:
Chatter is one of the major problems in today’s milling processes. Theoretical models to calculate stability lobes are used to predict and avoid chatter onset. However, current predictions are not accurate enough and significant deviations between predicted and experimentally observed stability limits have been reported.The causes for these deviations are diverse and can be the result of the sum of multiple effects. According to previous works, main errors in stability prediction are related to lack of knowledge about double period instability (flip lobes) and inappropriate determination of dy
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6

Tsai, Cheng-Han, and 蔡政翰. "The Study of Optimal Control for Chatter Suppression." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/89433539737599207294.

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Анотація:
碩士<br>國立高雄第一科技大學<br>機械與自動化工程所<br>94<br>ABSTRACT Chatter is a nuisance to precision machining. Most previous research regarded the time-delay effect in the chatter problems as a disturbance. This research focuses on the investigation of this time-delay problem, and considers its effect for chatter controller design. In this way, one would achieve a better performance of improving the machining stability. First, the time-delay effect is included in the formulation of equations of motion for a machining process. Then the optimal control is adopted for the system with the time-delay term, and the
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7

Hsu, Min-Ho, and 徐敏和. "Suppression of Chatter in End Milling by Fuzzy Control." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/28344552401934226378.

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8

Wu, Chung-Wey, and 吳仲偉. "Robust Controller for the Suppression of Chatter in Precision Machining." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/01056180570385986200.

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Анотація:
碩士<br>逢甲大學<br>自動控制工程所<br>96<br>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∞ contr
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9

Tsung-HsuanWu and 吳宗軒. "An Investigation on Milling Chatter Suppression via Spindle Speed Variation." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/98eu7j.

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Анотація:
碩士<br>國立成功大學<br>機械工程學系<br>105<br>In this study, effect of sinusoidal spindle speed variation on end milling is investigated based on semi discretization method. Tooth passing period is changed by period spindle speed variation, then result in interruption of regernerative effect and supress chatter. In order to clarify effect of system parameters on variable speed machining stability, effect of variation amplitude, variation frequency, modal parameters, shearing constant and process damping coefficients on stability of variable speed system is investigated in the present study. The results of
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10

SALLESE, LORENZO. "On the development of active fixtures for the mitigation of chatter vibrations in milling." Doctoral thesis, 2017. http://hdl.handle.net/2158/1081178.

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Анотація:
In the last decades, unstable vibrations originated in the milling process, often referred to as chatter vibrations, have collected the interest of several researches, mainly driven by the detrimental effect this phenomenon generates on productivity, surface finishing and tool wear. Although several approaches and techniques have been developed nowadays, their industrial application is still limited by the required expertise, time-consuming procedures or relevant interventions on the machine tool structures. This research is focused on the investigation and design of active fixtures to mitiga
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11

Wu, Yun-Hwa, and 吳允華. "Implementation of an Adaptive Controller for Chatter Suppression in Precision Machining." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/13192715898517723988.

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Анотація:
碩士<br>逢甲大學<br>自動控制工程所<br>96<br>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. The adaptive controll
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12

Liao, Yu-Chi, and 廖昱棋. "Chatter Analysis with Various Workpiece Sizes/Cutting Points and the Development of a Real time Chatter Suppression System in Turning." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/36356719638421398945.

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Анотація:
碩士<br>國立中興大學<br>機械工程學系所<br>103<br>In turning process, the occurring of chatter will vary with the change of workpiece size and the cutting location. In this study, the effects of workpiece size and cutting location on chatter were analyzed, as well as the development of a chatter monitoring and control system. To obtain the Lobe Stability Diagram for chatter analysis, the model tests on workpiece with various sizse and tool/workpeice contact locations were conducted first, and the CutPro software were then used for obtaining the stability diagram. Finally, an experiments were conducted to ve
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13

Tang, Chih-Hung, and 湯智宏. "Design of an Active Chatter Suppression Controller for the Turning of Slender Workpieces." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/07773047897342790017.

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Анотація:
碩士<br>逢甲大學<br>自動控制工程所<br>97<br>Chatter has counter effects in cutting process so that we desired to solve it. The traditional solutions in the workshop are enhancing the workpiece rigidity or reducing the depth of cut. However, these methods will also reduce the material removal rate. In this study, the chatter suppression for the turning of slender workpieces is investigated. A tool holder driven by a piezoelectric actuator was designed for suppressing chatter by using active control methods. It is noted that, when the displacement sensor makes measurements close to the cutting point, the mea
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14

Chang, Wei-Ren, and 張瑋壬. "Application of wavelet transform to chatter detection and suppression in 5-axis milling." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/durba5.

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Анотація:
碩士<br>國立臺灣科技大學<br>材料科學與工程系<br>106<br>The cutting processes usually cause vibration from the tool and the workpiece. Once the tool begins to vibrate, it will left wavy cuts on the surface of the workpiece. Therefore, not only the instantaneous vibration of the system but also the amount of fluctuation left by the previous cutting affects the cutting process. It calls regenerative chatter. If there is a strategy for regenerative chatter suppression, the workpiece topography and the processing efficiency can be improved. This study explores the causes of regenerative chatter through literature, a
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15

Chang-Xian, Liu, and 劉昌憲. "Application of Spindle Speed Selection Method in On-line Milling Machine Chatter Suppression." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/bepqf3.

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Анотація:
碩士<br>國立勤益科技大學<br>機械工程系<br>106<br>In recent years, due to fast development in machinery industry, precision processing and ultra-precision processing related technologies were widely applied, and requirements on production efficiency, material removal rate, processing precision and level of automation were accordingly enhanced. However, during the processing process, inappropriate cutting force usually urged strong relative vibration between the cutter and work object, which in turn generated self-excited chatter to affect processing precision, surface roughness of work object and the lifetime
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16

Ho, Ching-Hung, and 何慶鴻. "Design of an Adaptive Controller for Chatter Suppression in the Turning of Slender Workpieces." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/07226171681487849580.

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Анотація:
碩士<br>逢甲大學<br>自動控制工程所<br>97<br>In this paper, we design a piezo-actuated tool holder to replace the conventional tool holder for chatter suppression in the turning of slender workpieces. In designing the controllers, it is noted that the transfer function from the cutting force to the displacement of workpiece is difficult to be identified accurately and is time-varying in the turning process. Therefore, adaptive type controllers are adopted in this study. It is proved by theory that the controller designed by using an adaptive notch filter has the ability of improving the stability of the cut
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17

Dai, You-Yu, and 戴祐宇. "Design of a Novel Piezo-Actuated Toolholder for the Suppression of Chatter in Turning." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/41578008209209280068.

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Анотація:
碩士<br>逢甲大學<br>自動控制工程所<br>98<br>Abstract “Chatter” is a kind of self-excited vibration in the process of cutting. It corresponds to the relative displacement between the workpieces and cutting tools. Hence it lowers down the surface finish of workpieces, limits the material removal rate (MRR), and reduces the service life of cutting tools. Improvement of the performance of machining is surely expected provided chatter effect is suppressed. Chatter is more likely to happen in the cutting of slender workpieces. In this study, a novel piezo-actuated toolholder is designed to replace the tradition
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18

LIN, PO-HUA, and 林柏華. "Real-time Chatter Suppression and On-line IoT Cloud Platform System for End-Milling Process." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/w99x95.

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Анотація:
碩士<br>國立虎尾科技大學<br>機械與電腦輔助工程系碩士班<br>107<br>In recent years, the aerospace industry is rising, milling of high hardness alloy materials has become trend; however, the stability of milling is changed with machine rigidity, material properties and tool geometry. The traditional experience method has not been able to deal with chatter of processing. On-line chatter suppression technique can be used to avoid the unstable cutting conditions by milling stability model and obtaining the stable maching parameters. This study is divided into intelligent chatter suppression and IoT coud patform systems. I
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19

Chiang, Shiuh-Tarng, and 蔣旭堂. "Optimization of Machining Operations Using Neural Networks and Suppression of Chatter by Fuzzy Control in End Milling." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/55103589787663463242.

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