Vibration responses of parallel misalignment in Al shaft rotor bearing system with rigid coupling

Hujare, Deepak; Karnik, Madhuri

doi:10.1016/j.matpr.2018.10.178

Cited by 21 publications

(7 citation statements)

References 6 publications

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“…12 d) due to misalignment along with high vibration amplitude. 35 But, three shaft harmonics are observed in the spectrums of PP bearings (Fig. 11 c).…”

Section: Frequency Responsementioning

confidence: 97%

Dynamic Analysis of Outer and Inner Race Defects on Thermoplastic Rolling Bearing System Using Implicit Finite Element Method

Gaaliche¹,

Chithambaram²,

Fathallah³

2022

The International Journal of Acoustics and Vibration

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This paper proposes an improved finite element dynamic model to analyze the vibration response of a rolling bearing system. The vibration responses of defect free and defective polypropylene (PP) bearings are analyzed using the finite element analysis and compared with the experimental results using the in house developed bearing fatigue test rig. The boundary conditions of this model are imposed to ensure an adequate homogeneity with the experimental apparatus. This study considers the viscoelastic property of thermoplastic to investigate the effect of the flexibility and damping viscosity of material. The three-dimensional dynamic analysis detects the vibrations produced in a rolling bearing system. Modal frequencies and the vibration modes shapes which must be avoided had been determined. Monitoring the evolution of vibration signatures as a function of defect location is also carried out using Finite Element Analysis (FEM). Test results reveal that peak vibration amplitudes are more pronounced in an inner ring defect than in an outer ring defect. Vibration signals of stainless-steel bearings are investigated to compare the performance of the thermoplastic bearings with its metallic counterparts. Both test and simulation results reveal that a lower level of vibration is observed with PP bearings compared to that of metal. The PP bearings not only dampen vibrations, but also accommodate shaft misalignments unlike their steel counterparts. Once overall vibration spectrums results are validated, Von Mises stresses within the rings are evaluated under excessive loading conditions. The simulation results show that stress is high in raceways where the balls are compressed between the raceways. Computational results agree well with the experimental tests for the test scenarios.

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“…12 d) due to misalignment along with high vibration amplitude. 35 But, three shaft harmonics are observed in the spectrums of PP bearings (Fig. 11 c).…”

Section: Frequency Responsementioning

confidence: 97%

Dynamic Analysis of Outer and Inner Race Defects on Thermoplastic Rolling Bearing System Using Implicit Finite Element Method

Gaaliche¹,

Chithambaram²,

Fathallah³

2022

The International Journal of Acoustics and Vibration

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“…Hujare and Karnik presented the effect of parallel misalignment of Al shaft rotor on its vibration response by experimental and numerical analysis. ey found that the 1X, 2X, and 3X characteristic frequencies have maximum values of vibration amplitude [15]. Tuckmantel and Cavalca established the shaft misalignment model and got the harmonic components rising due to misalignment and verified it by test.…”

Section: Introductionmentioning

confidence: 96%

Effects of Ship Propulsion Shafting Alignment on Whirling Vibration and Bearing Temperature Response

Lei

Zhou

Chen

et al. 2021

Mathematical Problems in Engineering

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Ship’s propulsion shafting is one of the main sources of ship vibration and noise. The shafting, whirling vibrations, and alignment are important factors that affect the comfort, stability, and reliability during a ship’s navigation. However, the mechanism of the interacting of the both factors is not fully revealed. In this paper, the effect of shafting alignment on whirling vibration and the bearing temperature response is studied by experiment. The test scheme is designed reasonably according to the theoretical analysis. The results show that the horizontal component of the shafting whirling vibration can be effectively reduced by adjusting the shafting alignment state while the vertical component is not. The shafting axis balancing position (SABP) slightly moves upward in high speed, which should be considered in the dynamic alignment design of the shafting, especially for the high-speed shafting. Little ABSB (the angle between the shafting centre line and the No. 1 bearing centre line) is beneficial to the stable operation of shafting, while appropriately increasing the ABSB and bearing load is beneficial to reducing the shafting whirling vibration. By balancing the relationship between bearing load and ABSB, the performance of whirling vibration and bearing temperature response can be optimized.

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“…In the conventional analysis of spectra obtained using FFT, amplitudes and phases corresponding to the speed of the rotor and its multiplier, i.e., 1×, 2×, and 3×, namely, fundamental frequency order (1×), 2nd frequency order (2×), and 3nd frequency order (3×), are most commonly discussed. Tis is because when shaft misalignment occurs (either parallel or angle misalignment), the amplitudes and phases change substantially [1,9]. Moreover, when shaft misalignment occurs, the natural frequency of the shaft may be excited, and side bands near the natural frequency are generated.…”

Section: Introductionmentioning

confidence: 99%

On-Line Monitoring Shaft Misalignment of Feed Drive Systems Based on Time-Domain Shaft Rotating Holospectrum

Chiu

Cheng

Hsu

et al. 2023

Shock and Vibration

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Detection of early-stage misalignment of the ball screw in feed drive systems is the topic addressed in this study. The triaxial vibration amplitudes and phases of a rotating ball screw at the ball screw nut were extracted using the Vold–Kalman filtering order tracking (VKFOT). The rotating ball screw locus at the rotation speed and its multiplier in the time domain were then constructed to obtain corresponding holospectra. By using a self-organizing map, the features corresponding to various holospectra were extracted and quantified into metrices as a measure signifying the severity of ball screw misalignment. Experimental results indicated that the proposed method effectively detected the ball screw misalignment even though this misalignment was less than 30 μm in size. The experiments conducted in this study demonstrated the high sensitivity and effectiveness of the proposed method, which also has a clear advantage due to its simpler instrumentation compared with traditional accelerometry.

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Vibration responses of parallel misalignment in Al shaft rotor bearing system with rigid coupling

Cited by 21 publications

References 6 publications

Dynamic Analysis of Outer and Inner Race Defects on Thermoplastic Rolling Bearing System Using Implicit Finite Element Method

Dynamic Analysis of Outer and Inner Race Defects on Thermoplastic Rolling Bearing System Using Implicit Finite Element Method

Effects of Ship Propulsion Shafting Alignment on Whirling Vibration and Bearing Temperature Response

On-Line Monitoring Shaft Misalignment of Feed Drive Systems Based on Time-Domain Shaft Rotating Holospectrum

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