김수영 시의 요설

이미순 구보학회 2018 구보학보 Vol.0 No.20

Kim, Soo-young introduced the chatter in his poetry in 1960s. He concentrated on various theories of the chatter in the various philosophy and literature and presented his own poetics of the chatter. His introduction of chatter to poetry is deeply related to the facts that he intended to introduce dailiness to poetry, he diversely experimented colloquial style, he pursued anti-poetry, and he developed poetics of silence, etc. At first, Kim Soo Young focused on chatter of everyday language. He utilized marks, names, onomatopoeia, etc. for chatter of colloquial style and experimented chatter of image. And then, he showed chatter filling the blank of story in Magazine Encounter. In Phone Story, he showed chatter of phone and chatter of montage. In his later years, he experimented overtalk of sound. The chatter of Kim Soo Young’s poetry is significant as it showed modernity and becomes the way to offer criticism, autonomously succeeded the tradition of Korean oral poetry, becomes concrete methodology of anti-poetry, becomes creation methodology of poetry of silence, etc. 본 고에서는 김수영이 요설을 도입하여 요설의 시를 전개하는 배경과 양상을 구체적으로 살펴보고 그 특징을 규명하였다. 김수영은 요설, 잡담, 수다를 같은 뜻으로 사용하고 있었지만, 일상과 관련하여서는 ‘잡담’과 ‘수다’를, 문학과 관련하여서는 ‘요설’을 사용하였다. 김수영이 시에 요설을 도입하게 되는 것은 시에 일상성을 도입하고자 하였던 점, 구어체를 다양하게 실험하였던 점, 반시를 추구해나간 점, 침묵의 시학을 전개하였던 점 등과 깊은 관련을 지니고 있었다. 김수영이 시에 요설을 도입한 것은 1960년경부터였는데, 처음에는 일상어의 요설에 치중하였다. 「하…… 그림자가 없다」가 대표적인 예인데, 여기서 그는 일상어의 요설로 현대 사회의 일상성을 표현하였다. 그는 구어체의 요설도 다양한 방식으로 모색하였다. 일상 담화에 토대를 두면서도 부호, 이름, 의성어 등을 활용하여 요설을 이어나갔으며 이미지의 요설을 실험하기도 하였다. 「엔카운터 지(誌)」에서는 이야기의 여백을 채우는 요설을 선보였고, 「전화이야기」에서는 잡담 전화의 요설로, 몽타주의 요설을 보여주기도 하였다. 시작 말년에 이르러서는 소리의 요설을 실험하였는데, 「의자가 많아서 걸린다」에서 소리의 요설은 냉전 이데올로기를 해체하는 방법이 되었다. 김수영 문학에서 요설은 현대성을 드러내고 비판하는 방법이 되었다는 점, 한국 구술시의 전통을 독자적으로 계승하였다는 점, 반시의 구체적 방법론이 되었다는 점, 침묵의 시창작방법론이 되었다는 점 등의 의의를 지니고 있었다.

Fastener 토크 체결시 발생하는 Chatter현상에 대한 고찰

박창언(Changeon Park),김진호(Jinho Kim),박정도(Jungdo Park) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11

Based on the torque verification test for the chassis’s critical joints, we sometimes find out the chatter phenomenon for the bolted parts, when developing new car programs or tightening the fastener at the assembly plant. This paper focus on the cause and effects of the chatter for the joints. Because the chatter phenomenon can affect the durability and clamping load of the fastened joints, we mainly consider the quality of tightening all the vehicle’s clamped parts to prevent each part from chattering at assembly plant. Especially, the chatter sometimes comes out at the clevis-type joints during contacting between the fastener’s bearing surface and opposite clamped surface. So, we need to explain the relation of chatter-clevis joint and test methods. Furthermore we analyze the preventive measurement for the chatter that we keep that phenomenon stopping.

Milling Chatter Mitigation with Projection-Based Robust Adaptive Controller and Active Magnetic Bearing

Shaoke Wan,Xiaohu Li,Wenjun Su,Jun Hong 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.12

Chatter vibration has been a critical phenomenon in milling, and results in poor surface finishes, severe tool wear and shrill noise, which are usually overcome with quite conservative cutting parameters and hence the machining efficiency is significantly affected. In order to suppress the chatter vibration and improve the machining efficiency of milling process, a milling chatter mitigation method is presented with projection-based robust adaptive controller and an active magnetic bearing (AMB) installed in the milling spindle. The AMB is utilized to apply the active force to stabilize the milling process when the originally selected cutting conditions are unstable, with which the chatter-free boundary can be enlarged. Considering the possible parameters’ uncertainties of milling system which result from the nonlinear dynamic behaviors of the spindle system and the possible saturation of actuator caused by the noise, a projection-based robust adaptive controller is designed. Simulations of active chatter mitigation with different degrees of milling system’s uncertainties are performed, and the results show that the boundary of stability lobes diagram (SLD) of milling chatter is significantly enlarged. In addition, the milling experiments are also performed with the AMB installed in a milling spindle, and the results show that the chatter vibration is exactly mitigated with the presented method in this paper.

절삭력을 이용한 채터의 감지에 관한 연구

윤재웅 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3

In-process diagnosis of the cutting state is essential for the automation of manufacturing systems. Especially, when the cutting process becomes unstable, it induces self-exited vibrations, a frequent cause of poor tool life, rough surface finish, damage to the workpiece and the machine tool itself, and excessive down time. To ensure that the cutting process main-tains stable, it is highly desirable to have the capability of real-time monitoring and controlling chatter. This paper describes the detection method of chatter vibration using cutting force in turning process. In order to detect a chatter vibra-tion, the dynamic fluctuation of radial force is analyzed since this component is sensitive to the chatter. The envelope sig-nal of radial force has been calculated by the use of FIR Hilbert transformer, and it was useful to classify the chatter signal from the dynamically unstable circumstances. It was found that the mode and the mode width were closely correlated with the chatter amplitude as well. Finally, back propagation(BP) neural networks have been applied to the pattern recognition for the classification of chatter signal in various cutting conditions. The validity of this system was confirmed by the experiments under the various cutting conditions.

채터검출을 위한 신경회로망 적용법

유해득(Hae-Deuk Yu),진도훈(Do-hun Chin),김종도(Jong-Do Kim),윤문철(Moon-chul Yoon) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.3

The end-milling chatter behavior is very complex and is closely related to a non-periodic dynamic property and the end-milling force; therefore, it is very difficult to detect and diagnose chatter using the end-milling force. This paper presents a novel method for detecting chatter in end milling using neural network, such as Generalized regression neural network (GRNN), Radial basis neural network(RBNN) and perceptron regardless of periodic and non-periodic forces. As a pattern criterion variable for target data, stochastic variance and kurtosis are used for the neural network configuration. By comparing the end-milling force histories with stochastic variables in the fundamental end-milling property, the time domain chatter characteristics are well reviewed, and separated and patterned well for chatter detection. These neural network results using stochastic variables show the reliability of chatter detection; furthermore, it can detect the malfunction property in end-milling and can be applied for determining the existence of chatter.

정밀연삭시 발생하는 채터진동 실시간 감시에 대한 연구

김인응(InWoong Kim),이선표(SunPyo Lee),최현(Hyun Choi) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10

The chatter vibration in the machining process plays bad role in machining quality such as high roughness as well as tool life and machine failure. And the grinding process under this risk in the fully automated factory is exposed to the unexpected mass machining quality problem. Studying the vibration signal of the hub bearing grinding process, the reason of chatter vibration was explained with the specific machining pattern of chatter. And this study suggests the chatter detecting method in the production line, which is monitoring the peak acceleration level around the natural frequencies of the specimen, and calculating kurtosis value by assuming the chatter is related to the resonance of the specimen. The suggested method was applied to the vehicle hub bearing grinding process and proved good to detecting the chatter induced machining quality problem.

선반에서의 채터에 의한 가공 표면 시뮬레이션

홍민성,김종민 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.3

In metal cutting, chatter is the unstable cutting phenomenon which caused by the interaction between the dynamics of the chip removal process and the structural dynamics of machine tool. When the vibration and chatter occurs, it reduces tool life and results in poor surface roughness and low productivity of the machining process. In order to observe the effect of chatter on the turned surface, the surface simulation model based on the surface-shaping system are developed under the ideal condition and the occurrence of the regenerative chatter, and it is compared with experiment of profile. In this study, the experiments were conducted in a CNC lathe without cutting fluid to investigate the phenomenon of the chatter.

Experimental Investigation of Magneto Rheological Damping Effect on Surface Roughness of Work Piece during End Milling Process

Gulam Mohd Sayeed Ahmed,Pinninti Ravinder Reddy,Nuthalapati Seetharamaiah 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.

Metal cutting processes involve interaction of the machining forces with the work piece. In this processes the vibrations are induced in machine tools which have adverse effect on tool life, surface integrity and occurrence of undesirable chatter phenomenon. In order to enhance the quality of surface of the work piece after machining and avoid chatter marks and breakage of tool, this paper gives a unique method to detect and suppress the chatter effect on the work piece finis. This method incorporates the features of Magneto-Rheological fluid which utilizes the input current as source to modify the magnetic field to enhance the variable stiffness and produce damping effect to control the end mill cutter vibration and suppress the chatter. The variables stiffness and damping can be maintained by the damper input current to attain desired magnetic field in the MR damper. In this work the chatter detection is observed by means of a remarkable Bingham number. The different machining parameters are considered in the experimental work and the results are compared with and without the magneto rheological damping effect and the results shows the enhancement of surface quality and reduced the chatter marks on the work piece by producing Magneto- Rheological damping to the end mill cutter during machining.

Suppression of abnormal chattering of a high-speed EMU carbody

Dao Gong,Zegen Wang,Jinsong Zhou,Jianyue Zhu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4

A carbody chattering phenomenon accompanied by bogie hunting movement was investigated. The online test results showed that the vehicle at a large tread conicity state exhibited insufficient stability when running at higher speeds, causing the hunting frequency of the bogie to continuously increase, approach the diamond-shaped deformation modal frequency of the carbody, consequently causing the carbody to chatter. To improve the running stability of the vehicle, to suppress the carbody chattering, a two-step progressive optimisation method that combined analytical optimisation, simulation optimisation to optimise the parameters of the anti-yaw damper was proposed. Furthermore, the effect of optimisation was experimentally verified. Results showed that after optimisation, the critical speed of the vehicle under the condition of worn wheel was significantly enlarged, the bogie exhibited no obvious hunting motion, carbody chatter was significantly alleviated, both the ride quality, the curve passing performance were improved.

Methodologies of Chattering Attenuation in Sliding Mode Controller

Amirzubir Sahamijoo,Farzin Piltan,Mohammad Hadi Mazloom,Mohammad Reza Avazpour,Hootan Ghiasi,Nasri B. Sulaiman 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.2

Uncertain or complicated systems are difficult to control. Modeling the system uncertainties is an especial topics in most of engineering field. On the other hand, since system has uncertainty, design stable and robust controller is crucial importance in control engineering. To solve this challenge nonlinear control technique is the best choice. Sliding mode control is one important type of robust control. Model imprecision may come from actual uncertainty about the plant or from a purposeful simplification of the system's dynamics. Modeling inaccuracies can cause strong adverse effects on the control design of nonlinear systems. For the class of systems to which it applies, sliding mode controller design provides a systematic approach to the problem of maintaining stability and consistent performance in the face of modeling imprecision. However, sliding mode controller is a robust and stable controller but it has an important challenge called, chattering phenomenon. This research focuses on the comparative between three methods to eliminate/reduce the chattering.