Potential of manipulating the damping properties of parallel kinematic machine tools

• Autorzy: Wabner M. , Grzejszczyk S. , Neugebauer R.
• Języki publikacji: EN

Abstrakty

EN

Parallel kinematics with a higher end-effector degree of freedom such as hexapods and pentapods consist of a large number of joints and slender struts. However, it is only possible to create comparably low levelsof bearing and strut bending stiffness atreasonable expense due to the limited construction space. That means that these structures are very susceptible to vibration. Even in the low-frequency range they have a large number of relevant eigenmodes that are only dampened slightly. Simultaneously, it is difficult to analyze vibrational properties due to coupled eigenmodes, which also makes it difficult to discover ways to remedy this situation. This article will take the example of a pentapod to analyze the dynamic properties of slightly dampened parallel kinematics by simulation to study potential means of manipulating it. This will include a description of the model formation of the mechanical system. The article will also address ways of reducing model size and using various simulation environments to boost analysis efficiency. Finally, both passive and active strategies will be studied and evaluated for boosting damping. Amongst others it could be shown that it is not necessary to damp every of the five kinematic chains to achieve effective improvement of the system damping behaviour.

Słowa kluczowe

EN

machine tool; parallel kinematics; simulation; active damping

• Wydawca: Wydawnictwo Wrocławskiej Rady FSNT NOT
• Czasopismo: Journal of Machine Engineering
• Rocznik: 2008
• Tom: Vol. 8, No. 1
• Strony: 63--76
• Opis fizyczny: Bibliogr. 8 poz., tab., rys.

Twórcy

autor

Wabner M.

• Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz

autor

Grzejszczyk S.

• Institute of Machine Tools and Manufacturing Processes, Technical University of Chemnitz

autor

Neugebauer R.

• Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz
• Institute of Machine Tools and Manufacturing Processes, Technical University of Chemnitz

Bibliografia

• [1] EHMANN C., NORDMANN R., Low Cost Actuator for Active Danymin of Larf-e Machines, Cohf.-Speech, Mechatronics Conf, Berkeley, California, 2002.
• [2] HATCH M. R., Vibration Simulation Using Matlab and ANSYS, Chapman and Hall/CRC, Boca Raton, FL, 2000.
• [3] MAY C., PAGLIARULO P., JANOCHA H., Optimisation of a Magnetostrictive Auxiliary Mass Damper, Actuator 2006, Proc. 10th Int. Conf. on New Actuators, 2006, 344-348.
• [4] NEUBER H., Über allgemeine Eiaenschuften der Schwinnunnsmhlen linear-elastischer Systeme, Archive of Applied Mechanics, 1959, 28/1, 229-241.
• [5] SONTAG E.D., Mathematical Control Theory: Deterministic Finite Dimensional Systems, Second Edition, Springer, 1999.
• [6] WECK, M., SCHULZ A., Active Auxiliary Mass Damper, Production Engineering, 2004, XI/1, 39-43.
• [7] WEIDERMANN F., Strukturoptimierung von parallelkinematischen Werkzeugmaschinen, PhD Thesis, TU Chemnitz, 2001.
• [8] www.micromega-dynamics.com