ABSTRACT The machining of slim pieces is affected by the chatter phenomenon. In this paper a study of the factors that influence the surface roughness of slim pieces fabricated on a lathe under self-excitation chatter vibration is presented. The purpose of the study is to determine which are the variables more influents in the process. For this study a novel analytical model for predicting the ...

Deep hole drilling methods are used for producing holes with a high length-to-diameter ratio, good surface finish and straightness. The process is subject to dynamic disturbances that is classified as either chatter vibration or spiralling. In this work, nonlinear time series modeling is used to setup an on-line modeling approach of the time varying dynamics of the process. An on-line monitorin...

An analytical procedure is developed to predict workpiece dynamics in a complete machining cycle in order to obtain frequency response functions (FRF), which are needed in chatter stability analyses. For this purpose, a structural modification method that is an efficient tool for updating FRFs is used. The mass removed by machining is considered to be a structural modification in order to deter...

Machining is a common manufacturing process in industry due to its high flexibility and ability to produce parts which excellent quality. The productivity and quality in machining operations can be limited by several process constraints one of which is the self-excited chatter vibrations. Under certain conditions, the process may become unstable yielding oscillations with high amplitudes which ...

In this paper, using the analytical model developed by the authors, the effects of certain system design and operational parameters on the tool point FRF, thus on the chatter stability are studied. Important conclusions are derived regarding the selection of the system parameters at the stage of machine tool design and during a practical application in order to increase chatter stability. It is...

This paper proposes a design method for chatter monitoring based on the fourth order statistics estimation applied to the modelling error. Usually, a test of hypothesis is built on an a priori knowledge of the statistical distribution. The frequency function is often assumed Gaussian. In the case of machining process without chatter, the Gaussian assumption is not valid. Consequently, the propo...

Tree shrews are small mammals living in the tropical forest of Southeast Asia. The habitus of species within the genus Tupaia is often quite similar, so that it is difficult to differentiate the species based on their morphology. We applied comparative bioacoustics, a tool successfully used to discriminate cryptic species of nocturnal mammals, to investigate whether species in the diurnal genus...

We are just a few months away from the 2022 IEEE EMC+SIPI Symposium in Spokane, Washington over August 1–5 and hopefully you will be able to attend. If all goes according plan, this first in-person symposium years. It great opportunity catch up with fellow EMC Society members, take advantage of excellent technical program, see many vendors exhibit hall. Not mention attend social events g...