Determination of friction coefficient in journal bearings

Ünlü, Bekir Sadık; Atík, Enver

doi:10.1016/j.matdes.2005.09.022

Cited by 57 publications

(28 citation statements)

References 9 publications

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“…Many engineering applications [15][16][17][18][19][20][21][22] generally model friction with three terms: static friction when the velocity is zero, coulomb friction, and viscous friction. This fictional torque, , model is shown in (13) when the velocity is nonzero;…”

Section: Friction Modelingmentioning

confidence: 99%

System Performance of an Inertially Stabilized Gimbal Platform with Friction, Resonance, and Vibration Effects

Jia

Nandikolla

Haggart

et al. 2017

Journal of Nonlinear Dynamics

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The research work evaluates the quality of the sensor to perform measurements and documents its effects on the performance of the system. It also evaluates if this performance changes due to the environments and other system parameters. These environments and parameters include vibration, system friction, structural resonance, and dynamic system input. The analysis is done by modeling a gimbal camera system that requires angular measurements from inertial sensors and gyros for stabilization. Overall, modeling includes models for four different types of gyros, the gimbal camera system, the drive motor, the motor rate control system, and the angle position control system. Models for friction, structural resonance, and vibration are analyzed, respectively. The system is simulated, for an ideal system, and then includes the more realistic environmental and system parameters. These simulations are run with each of the four types of gyros. The performance analysis depicts that for the ideal system; increasing gyro quality provides better system performance. However, when environmental and system parameters are introduced, this is no longer the case. There are even cases when lower quality sensors provide better performance than higher quality sensors.

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Section: Friction Modelingmentioning

confidence: 99%

System Performance of an Inertially Stabilized Gimbal Platform with Friction, Resonance, and Vibration Effects

Jia

Nandikolla

Haggart

et al. 2017

Journal of Nonlinear Dynamics

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show abstract

“…The specimens have been worn and friction coefficient have been measured at radial journal bearing wear test rig at dry conditions as described by Atik et al [22] and Ünlü and Atik [23]. The wear losses have been measured at dry conditions of 20 N loads, 250 rpm (v = 0.130 m/s velocity) and every 30 min for 2.5 h (1177.5 m sliding distance).…”

Section: Preparation Of Experimental Materialsmentioning

confidence: 99%

Tribological properties of polymer-based journal bearings

2009

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“…Friction coefficient is determined from the friction force formed along the rotating direction of the bearing and from the movement of the steel bar connected to the bearing [13]. Radial wear test rig is illustrated in Fig.…”

Section: Radial Journal Bearing Wear Test Rigmentioning

confidence: 99%

“…These properties directly affect the fatigue and wear life [7][8][9]. In this study, friction coefficient, temperature values and wear losses of bearing-journal samples manufactured from pure Al, AlCuMg2, AlMgSi1Mn and AlMgSi alloys were determined by wearing [12,13] them on radial journal bearing wear test rig designed specially for this purpose. Pure Al, AlCuMg2, and AlMgSi1Mn bearings were manufactured from commercial Al alloys.…”

Section: Introductionmentioning

confidence: 99%