Torsional vibration measurements on rotating shaft system using laser doppler vibrometer

Xiang, Ling; Yang, Shixi; Gan, Chunbiao

doi:10.1016/j.optlaseng.2012.05.018

Cited by 41 publications

(20 citation statements)

References 9 publications

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“…As Xiang [9], presented by your article and referenced by Figs. 8a, 8b and 9 on the accuracy and consistency of its torsional vibration analysis results in the field of time and frequency, based on the principles of laser Doppler velocimetry.…”

Section: Discussionmentioning

confidence: 99%

“…In this study, the obtained results were based only on the numerical analysis, and it does not apply to an experimental procedure. In the work of Xiang et al [9], a laser torsional vibrometer was used to measure the torsion vibration of a rotating shaft system under electrical network impact. The system is modelled as a chain consisting of an elastic spring with concentrated mass points, and the multi-segments lumped mass model is established for this shafting system.…”

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confidence: 99%

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Experimental and Analytical Study of Torsional Vibration under Multiaxial Loading in Time Domain

Costa¹,

Silva²,

Durán³

et al. 2016

JMEA

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Abstract:The torsional vibration of power transmission shaft is a phenomenon whose analytical modeling can be represented by a differential equation of motion proposed by technical literature. The solutions of these equations need coefficients and parameters that, usually, must be experimentally estimated. This work uses a resistive electric SG (strain gage) to dynamically determine strains produced in the shaft due to harmonic oscillatory motion under multiaxial loading. This movement is simulated on a prototype specially developed for this purpose. It comprises a pulley attached to the end of a stepped cantilevered shaft, which is clamped at the opposite end. In this configuration, a cam generates a torque to the system, springs regulate the stiffness and the damping coefficient of the assembly, as well as they can be suitably adjusted to produce an underdamped condition. The main advantage, highlighted in this study, refers to a major simplification. Although the system under study shows multiple degrees of freedom (torsion and bending), the shape and the positioning of linking SGs with the resistor bridge (Wheatstone Bridge), allow to evaluate the loading effects independently, as if only one degree of freedom of the system exists at a time domain. Strains graphs for two forms of cyclic torsional oscillation, analytical and experimental, were successfully generated.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Experimental and Analytical Study of Torsional Vibration under Multiaxial Loading in Time Domain

Costa¹,

Silva²,

Durán³

et al. 2016

JMEA

View full text Add to dashboard Cite

show abstract

“…Recently, different non-contact vibration-based measurement methods have been developed such as laser vibrometers [13,14], stator current method, digital image correlation (DIC) and videometric technology. Ling et al determine the torsional vibration of a rotating shaft system under electrical network impact using laser doppler vibrometer [15]. Stator current-based methods use the current information from the stator of a motor to identify the motor failure even the gearbox perturbations [16].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Identification for Unbalanced Mass of Rotor Systems in Operation

et al. 2018

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Unbalanced mass identification is important for rotor systems. Current methods normally use sensors, which only detect vibration in two-dimensional (2D) space. Actually, the rotor systems vibrate in three-dimensional directions. In this paper, a non-contact method is developed to identify unbalanced mass of rotor systems in 3D space. A stereo video system with a pair of synchronized high-speed cameras is established and a feature point is employed to replace traditional contact transducer for measurement. Checkerboard target on a vibration table is used to implement dynamic calibration. The proposed method is compared with eddy current method and laser displacement method. The comparison experiments verify the detection ability of the unbalanced mass for the proposed method. Overall, the proposed method can provide more information than 2D detection methods, which has the great potential for fault diagnosis of rotating machinery.

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“…Therefore, efficient and accurate fault diagnosis technique is very important for guaranteeing reliability and performance of a scroll compressor. Over the past two decades, a large number of methods have been proposed for fault detection and diagnosis, and many attractive research results [6][7][8][9][10][11][12][13][14] have been obtained. In these methods, vibration-based spectrum analysis to the vibration signals of scroll compressors has been used as a regular technique in recent years [14][15][16] because of its capability of extracting fault feature from the signals.…”

Section: Introductionmentioning

confidence: 99%

A Vibration Analysis Based on Wavelet Entropy Method of a Scroll Compressor

Liu

2015

Entropy

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Vibration-based condition monitoring and fault diagnosis is an effective approach to maintain the reliable operation of a scroll compressor. Unfortunately, the vibration signal from the scroll compressor always has characteristics of being non-linear and non-stationary, which makes vibration signal analysis and fault feature extraction very difficult. To extract the significant fault features, a vibration analysis method based on Wavelet entropy is proposed in this paper. Two forms of the wavelet entropy, namely the wavelet space feature spectrum entropy (WSFSE) and the wavelet energy spectrum entropy (WESE), are defined to depict instantaneous characteristics of the local variation of the vibration signal. Four types of mechanical faulty vibration signal, namely unbalanced rotor, malfunctioning scroll, loosened mechanical assembly, and loosened bearing, are analyzed by using the proposed approach. The experimental results show that feature components and energy distribution of each fault signal is accurately identified and revealed, which proves that the combined application of WSFSE and WESE approach is a successful scheme for the vibration analysis of scroll compressors.

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Torsional vibration measurements on rotating shaft system using laser doppler vibrometer

Cited by 41 publications

References 9 publications

Experimental and Analytical Study of Torsional Vibration under Multiaxial Loading in Time Domain

Experimental and Analytical Study of Torsional Vibration under Multiaxial Loading in Time Domain

Three-Dimensional Identification for Unbalanced Mass of Rotor Systems in Operation

A Vibration Analysis Based on Wavelet Entropy Method of a Scroll Compressor

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