CJ 88-06. On geometrical optimization of machine tool structures

Serielle Werkzeugmaschinenstrukturen weisen ein posenabhängiges, dynamisches Verhalten auf, wobei die Eigenfrequenzen um mehrere Hertz im Arbeitsraum variieren können. Die genaue Kenntnis dieses Verhaltens gestattet eine verbesserte Regelung der Strukturen. Ein generelles parametrisches Maschinenmodell, dessen Parameter online durch einen Recursive-Least-Squares-Algorithmus an das reale Maschinenverhalten angepasst werden, stellt Informationen über dieses Maschinenverhalten bereit.   Serial machine tool structures feature a pose-dependent dynamic behavior with natural frequencies varying by serveral hertz within the working space. The accurate knowledge of this behavior allows an improved control of the structures. A general parametric machine model, whose parameters are adapted online to the actual machine tool behavior by a Recursive Least Squares algorithm, provides information about the pose-dependent dynamic behavior.

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Optimum Design Procedure of Dynamic Damper for Machine Tool Structures

Proceedings of the Nineteenth International Machine Tool Design and Research Conference ◽

10.1007/978-1-349-81412-1_25 ◽

1979 ◽

pp. 197-203

Author(s):

Y. Furukawa ◽

S. Shiozaki

Keyword(s):

Machine Tool ◽

Optimum Design ◽

Design Procedure ◽

Dynamic Damper ◽

Machine Tool Structures

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Steel-concrete Composite Material in CNC Machine Tool Structures

Acta Mechanica Slovaca ◽

10.21496/ams.2016.015 ◽

2016 ◽

Vol 20 (2) ◽

pp. 56-60

Author(s):

Dominik Hermansky ◽

Jiri Marek

Keyword(s):

Composite Material ◽

Machine Tool ◽

Cnc Machine Tool ◽

Cnc Machine ◽

Machine Tool Structures

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Modal Analysis of Machine Tool Structures Based on Experimental Data

Journal of Engineering for Industry ◽

10.1115/1.3185900 ◽

1983 ◽

Vol 105 (4) ◽

pp. 282-287 ◽

Cited By ~ 10

Author(s):

K. F. Eman ◽

K. J. Kim

Keyword(s):

Transfer Function ◽

Machine Tool ◽

Modal Analysis ◽

Moving Average ◽

Parametric Representation ◽

Modeling Procedure ◽

Fitting Procedure ◽

Machine Tool Structures ◽

Computer Based ◽

Three Degree Of Freedom

The basic problem in modal analysis of machine tool structures is the extraction of modal parameters from the measured transfer function data. Conventionally this task is performed in two steps. The transfer function is determined using a Digital Fourier Analyzer followed by a suitable curve fitting procedure. In order to avoid the inherent problems associated with these procedures a new approach for modal analysis is proposed in this paper. Anticipating the stochastic nature of the systems excitation and response Modified Autoregressive Moving Average Vector models (MARMAV) are proposed. The modeling procedure yields a parametric representation of the structural behavior allowing the extraction of the modal information in one step, directly, rather than in two as in the conventional approaches. The mathematical foundation for the approach is given along with its application to a simulated three-degree-of-freedom system and a knee type milling machine. The newly proposed procedure is commensurate to the existing ones in light of the computational efforts involved; however, it eliminates the subjective judgment of the analyst since the modeling procedure is based on rigorous statistical adequacy checks. Finally, the proposed approach is amenable for implementation in a computer-based machine tool structural dynamics analyzer.

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