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Keywords: damping
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Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Manuf. Sci. Eng. December 2010, 132(6): 061001.
Published Online: October 15, 2010
... is composed of several steps mainly including the shock pressure prediction, the modal analysis, and the forming process calculation. System critical damping is introduced to prevent unnecessary long post-shock residual oscillations and to greatly decrease the solution time for simulation. The bending...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Manuf. Sci. Eng. April 2010, 132(2): 021012.
Published Online: April 21, 2010
... is transformed into the principle modal directions of the rotating tool. The process damping is modeled as a linear function of vibration velocity. The dynamics of the milling system is modeled by a time delay matrix differential equation with time varying directional factors and speed dependent elements...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Manuf. Sci. Eng. October 2009, 131(5): 051019.
Published Online: October 1, 2009
...E. Budak; L. T. Tunc Although process damping has a strong effect on cutting dynamics and stability, it has been mostly ignored in chatter analysis as there is no practical model for estimation of the damping coefficient and very limited data are available. This is mainly because of the fact...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Manuf. Sci. Eng. August 2009, 131(4): 041005.
Published Online: July 8, 2009
... considers the effect of tool vibrations at the present and previous spindle revolutions on the chip area, chord length, and force directions and is solved using Nyquist stability criterion. The penetration of worn tool flank into the finish surface is considered as a source of process damping. The effects...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Manuf. Sci. Eng. February 2007, 129(1): 12–20.
Published Online: March 22, 2006
...C. Y. Huang; J. J. Junz Wang This paper extends analytical modeling of the milling process to include process damping effects. Two cutting mechanisms (shearing and plowing mechanisms) and two process damping effects (directional and magnitude effects) are included. The directional effect is related...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Manuf. Sci. Eng. November 2005, 127(4): 773–780.
Published Online: February 13, 2005
... bearing is employed both to excite the system and to increase the tool’s damping. The inherent time delay of the cutting process is “removed” in identification by limiting the observation period to less than one revolution period of the workpiece. The coefficients of several cutting tests were identified...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Manuf. Sci. Eng. August 2005, 127(3): 433–445.
Published Online: December 14, 2004
... operation has averaged the magnitude of these oscillations within each frame. The number of self-excited oscillations per tool revolution is given by the index number k p , max , so that the damping ratio ζ can be estimated by 6 ζ = δ R , k p max ∕ ( 2 k p , max...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Manuf. Sci. Eng. August 2004, 126(3): 467–474.
Published Online: September 7, 2004
... added lobes. The stability limit solution is first derived for zero damping where a final closed-form symbolic result can be realized up to second order. The un-damped solution provides a mathematical description of the added lobes’ locations along the speed axis, an added-lobe numbering convention...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Manuf. Sci. Eng. August 2004, 126(3): 475–480.
Published Online: September 7, 2004
... periodicity and damping. The added-lobes are shown to exist with a zero overlap factor (i.e., no regeneration) and to scale in magnitude (limiting width of cut) relative to overlap factor. Furthermore, the added lobes are shown to exist for multi-tooth machining even when there are no periods of full cutter...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Manuf. Sci. Eng. August 2005, 127(3): 463–475.
Published Online: September 1, 2004
... representative parameter, the “Green’s Function (GF).” This reflects the dynamic behavior of the tool prior to failure and, may provide a comprehensive and accurate measure of the damping variation of the cutting process subsystem at different forms of tool’s edge wear. As wear enters the high rate region...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Manuf. Sci. Eng. May 2002, 124(2): 226–233.
Published Online: April 29, 2002
...B. Fang; R. E. DeVor; S. G. Kapoor In this paper, a dynamic model that considers the vibrations of both the workpiece and fixture elements in order to accurately predict the friction damping over a wide range of clamping forces has been developed. The model is established based on the theory...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Manuf. Sci. Eng. August 2001, 123(3): 481–489.
Published Online: October 1, 2000
... characteristics have been compared to those obtained from the experiments and are found to be in good agreement. It was found that frictional sliding contact at the workpiece-fixture interfaces provides damping to the system and that the nature of this contact and level of damping are highly dependent on contact...