Influence of different parameters on nonlinear friction-induced vibration characteristics of water lubricated stern bearings

This paper is concerned with friction-induced vibration of a continuous propeller–shaft system excited by nonlinear friction due to contact between a water-lubricated bearing and a shaft. The dynamic equation is derived using Hamilton’s principle in conjunction with the finite element method. The drooping characteristics of the nonlinear friction and the torsional–lateral coupling via the bearing–shaft interaction laws are considered. Both stability analysis and responses analysis are then investigated through various system parameters. Stability is analyzed by determining the eigenvalues of the Jacobian matrix of the linearized system at the equilibrium point. Dynamic responses of the system are calculated on the basis of a reduced order modal model using the numerical integration method in order to validate the stability analysis. Numerical simulation proved to be consistent with the linear stability analysis. Analytical and numerical investigations reveal that friction-induced vibration of the proposed system is due to the combined action of nonlinear friction and coupled dynamics of the system, rather than the velocity-dependent friction alone as is commonly assumed.

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Finite Element Analysis on Vibration Characteristics of a Reciprocating Sliding System

World Tribology Congress III, Volume 1 ◽

10.1115/wtc2005-63658 ◽

2005 ◽

Author(s):

G. X. Chen ◽

Z. R. Zhou

Keyword(s):

Finite Element ◽

Vibration Characteristics ◽

Vibration Modes ◽

Vibration Frequencies ◽

Element Analysis ◽

Reciprocating Sliding ◽

Feature Characteristic ◽

Vibration Coupling ◽

Friction Induced Vibration ◽

Good Agreement

In this paper, a finite element method is applied to study the friction-induced vibration characteristics of a reciprocating sliding system. Finite element results are compared with vibration frequencies from an experimental test and are found to have a good agreement. Numerical results show that vibration modes corresponding to test squeals have the feature characteristic of vibration coupling in the normal and friction directions.

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Study on Nonlinear Friction-Induced Vibration in Water-Lubricated Rubber Stern Tube Bearings

The Open Mechanical Engineering Journal ◽

10.2174/1874155x01206010140 ◽

2012 ◽

Vol 6 (1) ◽

pp. 140-147 ◽

Cited By ~ 6

Author(s):

Engao Peng

Keyword(s):

Nonlinear Friction ◽

Friction Induced Vibration

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Experimental verification of the mechanism on stick-slip nonlinear friction induced vibration and its evaluation method in water-lubricated stern tube bearing

Ocean Engineering ◽

10.1016/j.oceaneng.2019.04.078 ◽

2019 ◽

Vol 182 ◽

pp. 147-161 ◽

Cited By ~ 6

Author(s):

Hyung Suk Han ◽

Kyoung Hyun Lee

Keyword(s):

Experimental Verification ◽

Evaluation Method ◽

Nonlinear Friction ◽

Stick Slip ◽

Friction Induced Vibration

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Piezoelectric-based dither control for automobile brake squeal suppression under various braking conditions

Journal of Vibration and Control ◽

10.1177/1077546320956765 ◽

2020 ◽

pp. 107754632095676

Author(s):

HweeKwon Jung ◽

Gyuhae Park ◽

Jeong Kyu Kim

Keyword(s):

Automotive Industry ◽

High Frequency ◽

Experimental Investigations ◽

Disc Brake ◽

Nonlinear Friction ◽

Frequency Range ◽

Brake Squeal ◽

Squeal Noise ◽

Piezoelectric Stack Actuator ◽

Friction Induced Vibration

Automobile brake squeal noise, which is nonlinear, friction-induced vibration in the frequency range 1–16 kHz, still remains a major problem for the automotive industry. This article presents analytical and experimental investigations into the application of dither control for active suppression of automobile disc brake squeal. Dither is a concept of active control that introduces high-frequency actuation into a system to suppress a much lower frequency disturbance. In this study, a specially designed brake system is built, in which a piezoelectric stack actuator in the piston of a floating caliper brake applies the dither input. In the experiments, squeal noise generated under the drag mode and various dynamic modes are considered. The results indicate that this piezoelectric-based dither control could effectively suppress the brake squeal noise by 5–10 dB and the squeal occurrence by up to 60% under various braking conditions.

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Characterisation of the Humming-Type Noise and Vibration of the Automotive HVAC System

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.16.2.2019.12.0499 ◽

2019 ◽

Vol 16 (2) ◽

pp. 6634-6648

Author(s):

A. Z. A. Mazlan ◽

M. H. A. Satar ◽

M. H. Hamdan ◽

M. S. Md. Isa ◽

S. Man ◽

...

Keyword(s):

Vibration Characteristics ◽

Operating Conditions ◽

Hvac System ◽

Frequency Range ◽

Noise And Vibration ◽

Power Steering ◽

Pump Compressor

The automotive heating and ventilating air condition (HVAC) system, when vibrating, can generate various types of noises such as humming, hissing, clicking and air-rushes. These noises can be characterised to determine their root causes. In this study, the humming-type noise is taken into consideration whereby the noise and vibration characteristics are measured from various HVAC components such as power steering pump, compressor and air conditional pipe. Four types of measurement sensors were used in this study - tachometer for rpm tracking; accelerometer for the vibration microphone for the noise; and sound camera for the visualization measurement. Two types of operating conditions were taken into consideration - they were “idle” (850 rpm) and “running” (850-1400 rpm) conditions. A constant blower speed was applied for both conditions. The result shows that the humming noises can be determined at the frequency range of 300-350 Hz and 150-250 Hz for both idle and running conditions, respectively. The vibration of the power steering pump shows the worst acceleration of 1.8 m/s2 at the frequency range of 150-250 Hz, compared to the compressor and air conditional pipe. This result was validated with the 3D colour order and sound camera analyses, in which the humming noise colour mapping shows dominance in this frequency range.

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