Determination of the Transfer Function by Means of Spectral Density Measurements and Its Application to the Dynamic Investigation of Machine Tools Under Machining Conditions

Opitz, H.; Weck, Manfred

doi:10.1016/b978-0-08-015661-3.50026-6

Cited by 9 publications

(2 citation statements)

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“…Minis et al 6 developed an improved method based on the work of Opitz and Weck 14 to provide a broadband excitation by interrupted cutting of a workpiece which has a random surface profile. However, the cutting force and the corresponding responses have to be measured in order to identify the modal parameters, which in this case leads to high cost.…”

Section: Modified Random Cutting Technique For Heavy Vertical Lathementioning

confidence: 99%

A complete methodology for identifying dynamics of heavy machine tool through operational modal analysis

Mao

Yan

Cai

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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Heavy machine tool work under such high-load conditions that chatter vibrations are prone to occur, which significantly diminishes the machining efficiency and quality. Stability lobe diagrams are commonly used to select appropriate spindle speed and axial depth of cut to get rid of chatter and maximize the material removal rate. However, this needs precise identification of the dynamics of the entire machine tool structure, especially in the low-frequency range. Operational modal analysis has been the proven technique for estimating dynamic characteristics of machine tool structures in operation conditions. In this article, a complete methodology was presented for employing operational modal analysis for heavy machine tool in machining conditions. A random cutting exciting method originally presented by Minis is modified which generates pseudorandom impulse force to excite a heavy vertical lathe structure. And the excitation signal of random cutting force was modeled to analyze the effect of cutting parameters on energy and frequency band of the excitation. One operational modal analysis method, the pLSCF (referred to as PolyMAX) method, was employed to estimate modal parameters during machining. It was also observed in chatter tests that the operational modal analysis results are more accurate than the traditional impact test results in characterizing the dynamics of machine tool structure in machining.

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Section: Modified Random Cutting Technique For Heavy Vertical Lathementioning

confidence: 99%

A complete methodology for identifying dynamics of heavy machine tool through operational modal analysis

Mao

Yan

Cai

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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show abstract

“…Due to the limitations in modeling approaches, there are several experimental studies that focus on identifying the aforementioned variations leading to uncertainties in machine tool dynamics under operational conditions [26][27][28][29][30][31][32]. A similarity of these experimental studies is that they require complicated experimental setups and the solution of signal processing problems.…”

Section: Introductionmentioning

confidence: 99%

Use of inverse stability solutions for identification of uncertainties in the dynamics of machining processes

Tunç

Özşahin

2018

Adv. Manuf.

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Research on dynamics and stability of machining operations has attracted considerable attention. Currently, most studies focus on the forward solution of dynamics and stability in which material properties and the frequency response function at the tool tip are known to predict stable cutting conditions. However, the forward solution may fail to perform accurately in cases wherein the aforementioned information is partially known or varies based on the process conditions, or could involve several uncertainties in the dynamics. Under these circumstances, inverse stability solutions are immensely useful to identify the amount of variation in the effective damping or stiffness acting on the machining system. In this paper, the inverse stability solutions and their use for such purposes are discussed through relevant examples and case studies. Specific areas include identification of process damping at low cutting speeds and variations in spindle dynamics at high rotational speeds. Keywords Inverse stability Á Machining dynamics Á High speed milling Á Process damping Á Spindle dynamics Adv. Manuf.

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Design Considerations for Light-Weight Construction: Fatigue and Stiffness of Forming and Cutting Machine Tool Structures

Umbach¹

1974

Proceedings of the Fourteenth International Machine Tool Design and Research Conference

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Determination of the Transfer Function by Means of Spectral Density Measurements and Its Application to the Dynamic Investigation of Machine Tools Under Machining Conditions

Cited by 9 publications

References 0 publications

A complete methodology for identifying dynamics of heavy machine tool through operational modal analysis

A complete methodology for identifying dynamics of heavy machine tool through operational modal analysis

Use of inverse stability solutions for identification of uncertainties in the dynamics of machining processes

Design Considerations for Light-Weight Construction: Fatigue and Stiffness of Forming and Cutting Machine Tool Structures

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