Dynamic modeling and simulation of a flexible-rotor ball bearing system

The nonlinear contact forces and deformations between the balls and raceways can cause very complex vibration behaviours of rotor systems with the waviness in the support bearings. However, almost all previous works that used sinusoidal waviness took the Hertzian solution as the calculation method, which is not an accurate method based on Johnson’s formulation since the changes in the curvature at the sinusoidal contact surfaces. To overcome this issue, a new dynamic model of a rigid rotor system with the waviness in the support bearings is proposed. To provide a more accurate nonlinear contact force formulation for the sinusoidal waviness profile, the model used the Johnson’s extended Hertzian contact model to replace Hertzian contact model. This model can consider the time-varying curvature between the mating sinusoidal surfaces. The lubricating condition in the support bearing is also considered. A comparative study on the effects of Hertzian contact model, simplified Hertzian contact model, and Johnson's extended Hertzian contact model on the nonlinear vibrations of the rotor system is developed. The effects of the waviness amplitude and orders on the vibrations of the rotor system are discussed. The comparative simulations show that the proposed model can provide a more reasonable approach for predicting the vibrations of the rigid rotor system. Moreover, the simulations give that the nonlinear contact forces in the support bearings can greatly affect the system vibrations.

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“…The used bearing damping is 0.25 − 2.5 × 10 −5 times the linearized bearing stiffness. 40,41 Effect of the outer race waviness on the vibrations…”

Section: Resultsmentioning

confidence: 99%

A vibration model of a rotor system with the sinusoidal waviness by using the non-Hertzian solution

Liu

Pan

2021

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…After the engine heats up and the clutch is connected, the vehicle enters the driving mode, so the engine speed rises quickly to about 1,500 rpm while keeping the engine stable. e acquired signals include the speed signal of the engine flywheel starter ring gear, the speed signal of the gearbox first shaft constant meshing gear, the vibration signal of the driver seat slide rail, the vibration signal of bearing vibration, and lubrication conditions in the gearbox system [25,26]. Figure 16 illustrates the noise spectra in the cab, according to which the cab interior noise is basically below 60 dB.…”

Section: Experimental Verificationmentioning

confidence: 99%

Optimization of Dual-Mass Flywheel Parameters Based on a Multicondition Simulation Test

Xie

Wang

Yan

et al. 2022

Shock and Vibration

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A dual-mass flywheel is an important part of an automobile transmission system whose function is to ensure the smooth transmission of engine power to a gearbox. Vehicle vibration and noise are major indicators of vehicle comfort, while dual-mass flywheel technology can preferably solve the comfort problem. Based on the created torsional vibration model, this paper describes the testing of the torsional characteristics under various conditions with an LMS AMESim simulation. The results show that the noise in the cab is fundamentally below 60 dB. The computational formula for the angular stiffness of an arc coil spring is derived, and then the spring angular stiffness is optimized with arithmetic averaging, which reveals an adjusted angular stiffness of 12.8 Nm/°. Additionally, the requirement for the angular acceleration of the WOT input shaft (i.e., being less than 500 rad/s2) is satisfied for various gears. The test results show that the double-mass flywheel can attain a vibration isolation efficiency of around 85%, which more effectively reduces the transmission vibration and noise and improves the vehicle comfort.

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“…1. The main vibration sources are from the motors and power components, such as the motor, gear pump, 21,22 roller bearing [23][24][25][26] and shaft 27 of the main power system. In Fig.…”

Section: Problem Formulationmentioning

confidence: 99%

Vibration Analysis and Isolator Component Design of the Power System in an Autonomous Underwater Glider

Liu¹,

Liu²,

Pan³

et al. 2022

The International Journal of Acoustics and Vibration

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Vibration isolation technology is one of the main methods for controlling the vibration and noise of underwater vehicles. This paper presents a vibration analysis and vibration isolator component design method of the power system in autonomous underwater gliders (AUGs). The dynamic models of the single-layer and double-layers vibration isolation systems of the power system of the AUG are established to analyze the force transfer rate in the system. A reasonable stiffness range of the vibration isolation system is obtained according to the results of the dynamic model. To validate the vibration isolation performances of the presented vibration isolation systems, the finite element (FE) models of single-layer and double-layers vibration isolation systems are established. The vibration responses and vibration isolation performances of the system with and without the rubber isolation systems are compared. Moreover, the effect of stiffness on the vibration isolation performances of the system is discussed. The presented results can provide some guidance for the design method of the vibration isolation system in the power system of AUGs.

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Dynamic modeling and simulation of a flexible-rotor ball bearing system

Cited by 65 publications

References 29 publications

A vibration model of a rotor system with the sinusoidal waviness by using the non-Hertzian solution

A vibration model of a rotor system with the sinusoidal waviness by using the non-Hertzian solution

Optimization of Dual-Mass Flywheel Parameters Based on a Multicondition Simulation Test

Vibration Analysis and Isolator Component Design of the Power System in an Autonomous Underwater Glider

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