Coupled torsion–bending dynamic analysis of gear-rotor-bearing system with eccentricity fluctuation

Dynamic analysis of a helical geared rotor-bearing system with composite rotating shafts

Aircraft Engineering and Aerospace Technology ◽

10.1108/aeat-04-2021-0095 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Ying-Chung Chen ◽

Xu Feng Cheng ◽

Siu-Tong Choi

Keyword(s):

Composite Material ◽

Dynamic Analysis ◽

Dynamic Characteristics ◽

Mesh Stiffness ◽

Content Type ◽

Gear Mesh ◽

Rotor Bearing ◽

Rotating Shafts ◽

Gear Mesh Stiffness ◽

Bearing System

Purpose This study aims to study the dynamic characteristics of a helical geared rotor-bearing system with composite material rotating shafts. Design/methodology/approach A finite element model of a helical geared rotor-bearing system with composite material rotating shafts is developed, in which the rotating shafts of the system are composed of composite material and modeled as Timoshenko beam; a rigid mass is used to represent the gear and their gyroscopic effect is taken into account; bearings are modeled as linear spring-damper; and the equations of motion are obtained by applying Lagrange’s equation. Natural frequencies, mode description, lateral responses, axial responses, lamination angles, lamination numbers, gear mesh stiffness and bearing damping coefficients are investigated. Findings The desired mechanical properties could be constructed using different lamination numbers and fiber included angles by composite rotating shafts. The frequency of the lateral module decreases as the included angle of the fibers and the principal shaft of the composite material rotating shaft increase. Because of the gear mesh stiffness increase, the resonance frequency of the coupling module of the system decreases, the lateral module is not influenced and the steady-state response decreases. The amplitude of the steady-state lateral and axial responses gradually decreases as the bearing damping coefficient increases. Practical implications The model of a helical geared rotor-bearing system with composite material rotating shafts is established in this paper. The dynamic characteristics of a helical geared rotor-bearing system with composite rotating shafts are investigated. The numerical results of this study can be used as a reference for subsequent personnel research. Originality/value The dynamic characteristics of the geared rotor-bearing system had been reported in some literature. However, the dynamic analysis of a helical geared rotor-bearing system with composite material rotating shafts is still rarely investigated. This paper shows some novel results of lateral and axial response results obtained by different lamination angles and different lamination numbers. In the future, it makes valuable contributions for further development of dynamic analysis of a helical geared rotor-bearing system with composite material rotating shafts.

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Nonlinear dynamic analysis of cutting head-rotor-bearing system of the roadheader

Journal of Mechanical Science and Technology ◽

10.1007/s12206-019-0106-7 ◽

2019 ◽

Vol 33 (3) ◽

pp. 1033-1043

Author(s):

Zhilong Huang ◽

Zhongchao Zhang ◽

Yiming Li ◽

Guiqiu Song ◽

Yang He

Keyword(s):

Dynamic Analysis ◽

Nonlinear Dynamic ◽

Nonlinear Dynamic Analysis ◽

Cutting Head ◽

Rotor Bearing ◽

Bearing System

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Dynamic Analysis of a Spur Geared Rotor-Bearing System with Nonlinear Gear Mesh Stiffness

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.945-949.853 ◽

2014 ◽

Vol 945-949 ◽

pp. 853-861 ◽

Cited By ~ 1

Author(s):

Ying Chung Chen ◽

Chung Hao Kang ◽

Siu Tong Choi

Keyword(s):

Dynamic Analysis ◽

Equations Of Motion ◽

Element Model ◽

Dynamic Responses ◽

Mesh Stiffness ◽

Gear Mesh ◽

Lagrange’S Equation ◽

Rotor Bearing ◽

Gear Mesh Stiffness ◽

Bearing System

The gear mesh stiffnesses have been regarded as constants in most previous models of geared rotor-bearing systems. In this paper, a dynamic analysis of a spur geared rotor-bearing system with nonlinear gear mesh stiffness is presented. The nonlinear gear mesh stiffness is accounted for by bending, fillet-foundation and contact deflections of gear teeth. A finite element model of the geared rotor-bearing system is developed, the equations of motion are obtained by applying Lagrange’s equation, and the dynamic responses are computed by using the fourth-order Runge-Kutta numerical method. Numerical results indicate that the proposed gear mesh stiffness provides a realistic dynamic response for spur geared rotor-bearing system.

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