&lt;title&gt;Chatter supression through variable impedance and smart fluids&lt;/title&gt;

Segalman, Daniel J.; Redmond, James M.

doi:10.1117/12.239147

Cited by 11 publications

(12 citation statements)

References 6 publications

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“…These include lobes just to the right ot~S2 = 1/2, Q = 1/3, Q = 1/4, and so on (Smith and Tlusty, 1991), which can be obtained analytically by , / where each J1 = 0, 1, 2, 3, ... corresponds to a different lobe. Segalman and Redmond (1996) observed the primary effects of impedance modulation from simulations to be in the domains of higher co (lower turning speed Q) where a small change in tool impedance is associated with a significant phase shift between the vibration of the current and the previous tool pass. Therefore, Figure 2 again shows the stability plots for both the unmodulated and modulated systems, but it focuses on the lower turning frequencies.…”

Section: Discussion Of Resultsmentioning

confidence: 89%

Suppression of Regenerative Chatter via Impedance Modulation

Segalman

Butcher

2000

Journal of Vibration and Control

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A new technique for the suppression of machine tool chatter in turning based on modulation of the system impedance is analyzed. The modulation frequency is selected as half the spindle frequency. Using the method of harmonic balance and a numerical root finding scheme on the transcendental characteristic equation, stability diagrams arc computed for a variety of modulation amplitudes. The stability boundaries are verified by using the Nyquist stability criterion and growth exponents computed from transient simulations of the vibratory response. It is shown in this way that the impedance modulation technique successfully scrambles the regenerative process that leads to chatter and widens the stability region (by increasing the maximum allowed cutting depth), particularly for low values of the spindle speed.

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Section: Discussion Of Resultsmentioning

confidence: 89%

Suppression of Regenerative Chatter via Impedance Modulation

Segalman

Butcher

2000

Journal of Vibration and Control

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“…Increasing the damping can be achieved by passive [5,6], semi-active [7][8][9] or fully active [10][11][12] means. Another seemingly elegant method is to attempt to break up the mechanism of regenerative chatter by rapidly varying the spindle speed [13,14].…”

Section: Introductionmentioning

confidence: 99%

Analytical prediction of chatter stability for variable pitch and variable helix milling tools

Sims

Mann

Huyanan

2008

Journal of Sound and Vibration

178

120

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Regenerative chatter is a self-excited vibration that can occur during milling and other machining processes. It leads to a poor surface finish, premature tool wear, and potential damage to the machine or tool. Variable pitch and variable helix milling tools have been previously proposed to avoid the onset of regenerative chatter. Although variable pitch tools have been considered in some detail in previous research, this has generally focussed on behaviour at high radial immersions. In contrast there has been very little work focussed on predicting the stability of variable helix tools. In the present study, three solution processes are proposed for predicting the stability of variable pitch or helix milling tools.The first is a semi-discretisation formulation that performs spatial and temporal discretisation of the tool. Unlike previously published methods this can predict the stability of variable pitch or variable helix tools, at low or high radial immersions.The second is a time-averaged semi-discretisation formulation that assumes time-averaged cutting force coefficients. Unlike previous work, this can predict stability of variable helix tools at high radial immersion.The third is a temporal-finite element formulation that can predict the stability of variable pitch tools with a constant uniform helix angle, at low radial immersion.

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“…No experimental results were presented. Segalman and Redmond [132] utilized ER fluids to actively control the impedance of boring bars to suppress chatter. This approach is similar to a conventional chatter avoidance method, which adjusts the spindle speed so that the cutting process stays inside the stability region.…”

Section: Mr and Er Fluidsmentioning

confidence: 99%