Modal Analysis as the Base of Dynamic Analysis

Monková, Katarína; Monka, Peter; Cizikova, Andrea; Murgas, Filip; Řehoř, Jan; Edl, Milan

doi:10.4028/www.scientific.net/amm.798.148

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…At the moment, the numerical, analytical and experimental are most frequently used methods. With the development of modern computer technology, the numerical method has gradually become a main method to study the dynamic characteristics of a cutting system; especially, the FEM is commonly used to establish the governing equations of the system so as to obtain the modal parameters [ 14 , 15 ]. Furthermore, experimental methods that are simple and obtain results easily are also widely used.…”

Section: Introductionmentioning

confidence: 99%

Chatter Stability Prediction for Deep-Cavity Turning of a Bent-Blade Cutter

Wang,

Song,

Liu

2024

Sensors

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The bent-blade cutter is widely used in machining typical deep-cavity parts such as turbine discs and disc shafts, but few scholars have studied the dynamics of the turning process. The existing mechanism of regenerative chatter in the metal-cutting process does not consider the influence of bending and torsional vibration, the change of tool profile and the complex machining geometry, so it cannot be directly used to reveal the underlying cause of the chatter phenomena in the deep inner cavity part turning process. This paper attempts to investigate the dynamic problem of the bent-blade cutter turning process. The dynamic model of a bent-blade cutter is proposed by considering the regenerative chatter effect. Based on the extended Timoshenko beam element (E-TBM) theory and finite element method (FEM), the coupling between the bending vibrations and the torsional vibrations, as well as the dynamic cutting forces, are modeled along the turning path. The vibration characteristics of the bending–torsion combination of cutter board and cutter bar, together with the dynamical governing equation, were analyzed theoretically. The chatter stability of a bent-blade cutter with a bending and torsion combination effect is predicted in the turning process. A series of turning experiments are carried out to verify the accuracy and efficiency of the presented model. Furthermore, the influence of cutting parameters on the cutting process is analyzed, and the results can be used to optimize the cutting parameters for suppressing machining vibration and improving machining process stability.

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Section: Introductionmentioning

confidence: 99%

Chatter Stability Prediction for Deep-Cavity Turning of a Bent-Blade Cutter

Wang,

Song,

Liu

2024

Sensors

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Dynamic analysis and surface morphology prediction for deep cavity turning of bent-blade cutter

Wang,

Song

2023

Int J Adv Manuf Technol

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Investigation of Toothed Shaft from the View of Modal Parameters

et al. 2019

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The paper deals with the investigation of toothed shaft from the view of modal analysis, which is a base of dynamic analysis. The gear mechanism is newly designed based on new principle, at which the motion and power are transferred from one input shaft to two output shafts in one direction. Considering that structures vibrate in special shapes when excited at their resonant frequencies, by understanding the mode shapes, all the possible types of vibration can be predicted. The paper aimed to create experimental and computational model of the shaft with subsequent verification of selected theories, to compare results obtained by numerical and experimental modal analysis and to assess the dynamic characteristics of the component with respect to its operating conditions. There are described conditions of both numerical and experimental modal analysis in the paper. The measurements have shown that the values of natural frequencies along with the natural shapes are adequate and comparable within both of the investigation methods. Moreover, from the results it is clear that output shaft should not be subjected to resonance. On the other hand, by means of modal analysis, the number of teeth was specified, that can be risky at the dynamic load of the gear, if the gear ratio changes.

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Modal Analysis as the Base of Dynamic Analysis

Cited by 3 publications

References 4 publications

Chatter Stability Prediction for Deep-Cavity Turning of a Bent-Blade Cutter

Chatter Stability Prediction for Deep-Cavity Turning of a Bent-Blade Cutter

Dynamic analysis and surface morphology prediction for deep cavity turning of bent-blade cutter

Investigation of Toothed Shaft from the View of Modal Parameters

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