Effect of dynamic misalignment on the vibration response, trajectory followed and defect-depth achieved by the rolling-elements in a double-row spherical rolling-element bearing

Parmar, Vivek; Saran, V. H.; Harsha, S. P.

doi:10.1016/j.mechmachtheory.2021.104366

Cited by 25 publications

(4 citation statements)

References 24 publications

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“…But in case the shaft is misaligned through some angle (Figure 1(a)), one row of the rows now carries more load than the other row making the contact angles of the two rows differ from each other. 22 In such a condition, the components of the contact loads of the two rows do not balance each other and produce an effective moment about the radial axis. The moment load thus produced, tends to rotate the inner-race about the bearing’s radial axis, by pushing the inner-race of the bearing out of the radial plane and also against the rigid shaft.…”

Section: Mathematical Modellingmentioning

confidence: 99%

“…The model correctly predicted the behavior of bearing in frequency and time domain. Parmar et al [20][21][22] through mathematical modelling and experimentations predicted the response of a double-row self-aligning ball bearing subjected to unbalance rotor conditions, localized defects and misalignment of the raceways. The effect of misalignment of raceways was also investigated using numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

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An autonomous method for diagnosing raceway defects and misalignment in a self-aligning rolling-element bearing

Parmar

Saran

Harsha

2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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This paper presents an autonomous method to diagnose a double-row self-aligning ball bearing for any dynamic misalignment or localized defects, using vibration signals. The frequency spectra from the experimental investigation revealed that irrespective of the health condition of the bearing i.e. either healthy or defective, the frequency spectrum had a clear cage frequency peak whenever the system was under dynamic-misalignment. An improved version of Harmonic Product Spectrum (HPS) called sideband product spectrum (SPS) was used to identify the cage frequency peaks which was preprocessed using kurtosis-based band-pass filter and parameter-optimized variational mode decomposition (VMD) algorithm. A mathematical model is also presented to analyze the dynamic behavior of double-row self-aligning ball bearing under such conditions. From the model, it was realized that during misalignment, the contact load shared by the rolling elements, generates some moment which has a tendency to rotate the bearing’s inner-race about the radial axis and thus resulting in a wobbly rotary motion. This wobbly motion of the inner race in fact characterizes the bearing for dynamic misalignment. The simulated results were in accordance with the experimentally obtained results.

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Section: Mathematical Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An autonomous method for diagnosing raceway defects and misalignment in a self-aligning rolling-element bearing

Parmar

Saran

Harsha

2022

Proceedings of the Institution of Mechanical Engineers, Part K:

Self Cite

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“…The test found that static misalignment will increase the radial stiffness of angular contact ball bearing, while dynamic misalignment would reduce the radial stiffness of bearing. At present, the modeling methods of bearing misalignment can be mainly divided into stiffness model calculated by static and quasi-static methods [34][35][36][37][38][39][40][41][42], and nonlinear force model [43,44]. Zhang et al [35] derived an improved quasi-static angular contact ball bearing model, discussed the influence of misalignment on bearing load distribution, stiffness and life under axial load and combined load.…”

Section: Introductionmentioning

confidence: 99%

“…The research found that bearing misalignment significantly impacts the dynamic characteristics and amplitude of the system. Taking double-row angular contact ball bearing as the research object, Parmar et al [44] considered the influence of bearing outer ring defects and bearing angular misalignment, and proposed the expression of a 3-DOF nonlinear restoring force model considering bearing angular misalignment. The vibration response of bearing was studied, and relevant experimental research was carried out.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of ball bearing-coupling-rotor system with angular misalignment fault

Wang

Yang

et al. 2022

Nonlinear Dyn

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The rotor misalignment fault, which occurs only second to unbalance, easily occurs in the practical rotating machinery system. Rotor misalignment can be further divided into coupling misalignment and bearing misalignment. However, most of the existing references only analyze the effect of coupling misalignment on the dynamic characteristics of the rotor system, and ignore the change of bearing excitation caused by misalignment.Based on the above limitations, a five degrees of freedom nonlinear restoring force mathematical model is proposed, considering misalignment of bearing rings and clearance of cage pockets. The finite element model of the rotor is established based on the Timoshenko beam element theory. The coupling misalignment excitation force and rotor unbalance force are introduced. Finally, the dynamic model of the ball bearing-coupling-rotor system is established. The radial and axial vibration responses of the system under misalignment fault are analyzed by simulation. The results show that the bearing misalignment significantly influences the dynamic characteristics of the system in the low-speed range, so bearing misalignment should not be ignored in modeling.With the increase of rotating speed, rotor unbalance and coupling misalignment have a greater impact.Misalignment causes periodic changes in bearing contact angle, radial clearance, and ball rotational speed. It also leads to reciprocating impact and collision between the ball and cage. In addition, misalignment increases the critical speed and the axial vibration of the system. The results can provide a basis for health monitoring and misalignment fault diagnosis of the rolling bearing-rotor system.

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Vibration Analysis of Double-Row Cylindrical Roller Bearing with Misalignment of Inner Race

Gong,

Zhou,

Ding

et al. 2024

Mechanisms and Machine Science

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Effect of dynamic misalignment on the vibration response, trajectory followed and defect-depth achieved by the rolling-elements in a double-row spherical rolling-element bearing

Cited by 25 publications

References 24 publications

An autonomous method for diagnosing raceway defects and misalignment in a self-aligning rolling-element bearing

An autonomous method for diagnosing raceway defects and misalignment in a self-aligning rolling-element bearing

Dynamic characteristics of ball bearing-coupling-rotor system with angular misalignment fault

Vibration Analysis of Double-Row Cylindrical Roller Bearing with Misalignment of Inner Race

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