Mahboubkhah, M., pakzad, S., Homayoun Sadeghi, M., Ettefagh, M. (2018). Vibration Analysis of 2-PR(Pa)U- 2-PR(Pa)R New Parallel Mechanism. International Journal of Advanced Design and Manufacturing Technology, 11(2), 47-56.
Mehran Mahboubkhah; sajjad pakzad; Morteza Homayoun Sadeghi; Mir Mohammad Ettefagh. "Vibration Analysis of 2-PR(Pa)U- 2-PR(Pa)R New Parallel Mechanism". International Journal of Advanced Design and Manufacturing Technology, 11, 2, 2018, 47-56.
Mahboubkhah, M., pakzad, S., Homayoun Sadeghi, M., Ettefagh, M. (2018). 'Vibration Analysis of 2-PR(Pa)U- 2-PR(Pa)R New Parallel Mechanism', International Journal of Advanced Design and Manufacturing Technology, 11(2), pp. 47-56.
Mahboubkhah, M., pakzad, S., Homayoun Sadeghi, M., Ettefagh, M. Vibration Analysis of 2-PR(Pa)U- 2-PR(Pa)R New Parallel Mechanism. International Journal of Advanced Design and Manufacturing Technology, 2018; 11(2): 47-56.
Vibration Analysis of 2-PR(Pa)U- 2-PR(Pa)R New Parallel Mechanism
1Department of Mechanical Engineering, University of Tabriz, Iran
2university of tabriz
3Department of Mechanical Engineering,
University of Tabriz, Iran
Abstract
Parallel kinematic machines, are closed loop structures which have more accuracy, stiffness and ability to withstand high loads. In this paper the vibration equations of the new parallel mechanism, that has higher stiffness because of parallelogram system and fixed length pods, have been derived by analytical approach. Whereas the proposed mechanism is applied as a machine tools, its vibrational behavior investigation has key impact factor. All the kinematic chains of the mechanism have been taken into consideration to achieve the coupled system of equations. To extract mechanism natural frequencies, modal analysis is carried out using three methods including analytical, finite element (FEM) and experimental method on parallel mechanism which has four degrees of freedom including three linear motion along the x, y and z axes and a rotary motion about x axis. Finally the natural frequencies and mode shapes obtained from analytical, experimental and FEM were compared. It is worth noting that all the frequencies obtained from three methods had little differences.
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