Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 62 for “"Chatter"”.
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Chatter--a conversational telephone agent
Thesis (M.S.)--Massachusetts Institute of Technology, Program in Media Arts & Sciences, 1993.
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Machine tool chatter suppression using spindle speed variation
… In [2] authors present a technique to suppress chatter, where spindle speed is varied as piecewise constant uniform noise. Using the results of vector case, we attempt to see whether stabilization can be achieved by varying spindle speed as a two state Markov chain. We find that the noise …
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A study of chatter-induced loss of mechanical contact
… paradox in rigid body mechanics called reverse chatter, in which friction can cause the problem of two rigid bodies in sustained contact to admit multiple solutions. In particular, when the point of contact between the two bodies comes to rest, under certain conditions the rigid body …
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The use of the chatter mode in self-adaptive systems.
Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Thesis. 1967. M.S.
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CHATTER : a spoken language dialogue system for language learning applications
The goal of this thesis is to build a Computer Aided Language Learning game that simulates a casual conversation in Mandarin Chinese. In the envisioned system, users will chat with a computer on topics ranging from relationship status to favorite Chinese dish. I hope to provide learners with more …
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Vibration Control for Chatter Suppression with Application to Boring Bars
… 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 …
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Artificial Conversations for Chatter Bots Using Knowledge Representation, Learning, and Pragmatics
Chatter bots are software programs that engage in artificial conversations through a text-based input medium. Many businesses have automated their online customer service support by deploying chatter bots. These customer service chatter bots interact with customers, answer their queries, and …
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Approaches for chatter reduction in deep cavity and intricate surface milling
… of a tool to attenuate the vibrations that cause chatter at higher spindle speeds.
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From Baby Babble to Childhood Chatter: Predicting Infant and Toddler Communication Outcomes Using Longitudinal Modeling
The importance of early communication development for later literacy, school achievement, and social interaction cannot be understated, according to a large body of literature. There is a consensus in the field of childhood communication that intervention could be applied earlier to prevent …
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Bifurcation analysis near the cessation of complete chatter and Shilnikov homoclinic trajectories in a pressure relief valve model
The student, Erika Fotsch, submitted this Thesis for approval on 2016-01-19 at 09:37.
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Modeling and robust adaptive control of metal cutting via application of piezoactuator
Self-excited vibration, so called chatter, is known to cause detrimental effects on the machined surface finish and to decrease the machining efficiency. Because of the small amplitude, high frequency properties of chatter, it requires active vibration control providing a force to the cutting …
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Wireless Sensor Integrated Tool for Characterization of Machining Dynamics in Milling
… Of specific interest are the problems of tool chatter which causes limitations to productivity and part quality. Although tool chatter is a substantial issue in machining, it remains an open research topic. In this research, a sensor integrated cutting tool holder is developed to specifically …
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Optimisation of variable helix end milling tools
… the system, leading to self-excited vibration or chatter. This thesis focuses on the avoidance of milling chatter by using variable helix milling tools. Since milling chatter is strongly influenced by the frequency response function of the dynamic system, a preliminary study is first presented to …
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The dynamic cutting of metals
Prediction of regenerative machine tool chatter requires a knowledge of the cutting forces existing under vibration conditions. Previous direct experimental work has been very limited in its range and has given results which contradicted those derived from observations on regenerative chatter. A …
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Design of an automated on-car brake lathe
… with dynamic stiffness sufficient to suppress chatter. During this thesis, two prototype cutting heads were designed, manufactured, and tested. The first prototype employed modular linear bearings, and produced unacceptable surface finish due to chatter. Cutting-tip vibration measurements …
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On Motion Mechanisms of Freight Train Suspension Systems
… wedges and bolster. The impacts cause the chatter motions between wedges and bolster, and the friction will cause the stick and non-stick motions between wedges and bolster. Due to the wedge effect, the suspension system may become stuck and not move, which cause the suspension lose …
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ΠΡΟΣΟΜΟΙΩΣΗ ΕΞΕΛΙΞΗΣ ΑΥΤΟΔΙΕΓΕΙΡΟΜΕΝΩΝ ΤΑΛΑΝΤΩΣΕΩΝ ΚΑΤΑ ΤΗΝ ΤΟΡΝΕΥΣΗ ΚΑΙ ΤΟ ΦΡΑΙΖΑΡΙΣΜΑ ΜΕ ΣΚΟΠΟ ΤΟΝ ΠΡΟΣΔΙΟΡΙΣΜΟ ΔΥΝΑΜΙΚΑ ΕΥΣΤΑΘΩΝ ΣΥΝ...
… CALCULATED, WITH THE RESULT ONINDICATION OF THE CHATTER EVOLUTION. SO IT IS POSSIBLE TO DERIVE DYNAMICALLY LIMITING CUTTING CONDITIONS AND TO SET CORRESPONDING STABILITY CHARTS. THE VALIDITY OF THIS METHODOLOGY IS VERIFIED THROUGH EXPERIMENTAL MEASUREMENTS AND APPEARS TO BE A GOOD APPROACH TO THE …
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Modelado de procesos industriales complejos a través de minería de datos. Aplicación a un tren de laminación en frío
… el proceso de laminación en frío del acero, el chatter. Mediante datos tomados de una factoría real se trató de caracterizar el fenómeno y así diferenciarlo de episodios vibratorios similares. A continuación y a través de un modelo simple, se simuló el chatter bajo puntos de funcionamiento …
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Virtual five-axis flank milling of jet engine impellers
… machining tool paths and a new five-axis chatter stability algorithm. A semi-discrete, solid-modeling-based method of obtaining cutter-workpiece engagement (CWE) maps for five-axis flank milling with tapered ball-end mills is developed. It is compared against a benchmark z-buffer CWE …
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