Estimating rotor unbalance from a single run-up and using reduced sensors

Shamsah, Sami M. Ibn; Sinha, Jyoti; Mandal, Parthasarathi

doi:10.1016/j.measurement.2018.11.044

Cited by 15 publications

(12 citation statements)

References 14 publications

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“…In this section of the paper, an output only Fourier-based modal test has been conducted on the machine where the machine is switched off. Impulse-response method has been employed , [27] and [36]. By using a hard plastic-tip impact hammer, the machine has been excited in the studied frequency range.…”

Section: Modal Analysis Testmentioning

confidence: 99%

“…Presenting a reliable balancing method to minimize vibrations of the rotating devices was concerned in most of these research works. As an illustration, Shamsah et al [27] have worked on a new method of balancing which requires a reduced number of vibration sensors to reduce the computational efforts in the complex signal processing. So, the machine down time could be reduced significantly as a result.…”

Section: Introductionmentioning

confidence: 99%

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A Speed-Variant Balancing Method for Flexible Rotary Machines Based on Acoustic Responses

Peplow¹,

Isavand²,

Kasaei³

et al. 2021

Preprint

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As rotary machines have become more complicated, balancing processes have been classified as a vital step in condition monitoring to ensure machines operate both reliably and safely. This is especially important for flexible machines which normally work at rotations speeds above critical limits. Imbalance is a common problem in flexible rotating machinery that can lead to extreme vibration and noise levels. This is one of the major reasons for studying various balancing methods applied to the vibration response of rotating machines. Recently, the relation between acoustic and vibration response during a rotary machine balancing process based on the Four-Run method has been presented for constant speed machines. This method cannot be applied to machines in start-up or shut-off. Hence, by considering the acoustic and vibration responses of a machine between its critical speeds, this research presents a new innovative speed-variant balancing method based on the original Four-Run method, named as "Peak to Peak for Critical Speeds (PPCS)". The proposed method consists of two major types of application: the first is in the Run-up of the machine and the second is in Shut-down. Experimental laboratory results show that the PPCS method can be implemented for speed-variant and flexible rotary machines during run-up or shut-down transient processes based on acoustic and vibration measurements. As a phase-less and a contactless method, the PPCS can be employed as an innovative and readily available method for condition monitoring in the future.

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Section: Modal Analysis Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Speed-Variant Balancing Method for Flexible Rotary Machines Based on Acoustic Responses

Peplow¹,

Isavand²,

Kasaei³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Now, to obtain the unknowns in model equation (15) and to execute the Box-Behnken design [BBD] for obtaining the experimental data to get solution to the matrix equation ( 19), a design matrix was obtained using the MINITAB software that has dimensions of the [(2f (f -1) +Cpf )] for experimental runs in that f indicated the number of factors and Cp indicated the number of central points. Accordingly, in the analysis of the vibration response of the unbalanced rotor due to factors such as mass unbalance, rotor speed, mass eccentricity and radial load on rotor, different combinations of these factors were executed to verify the dependence of the vibration amplitude at synchronous frequency component on these factors giving total 27 experimental data sets.…”

Section: Experimentation and Data Acquisitionmentioning

confidence: 99%

“…Their proposed method turned out to be efficient for rotor balancing without a test run and external excitation. Shamsah et al 15 put forth a novel method for the detection of rotor unbalance with a technique involving a lesser number of sensors. The method can be beneficial for the bigger rotating machineries having number of bearings.…”

Section: Introductionmentioning

confidence: 99%

A Model To Estimate Synchronous Vibration Amplitude For Detection of Unbalance in Rotor-Bearing System

Jamadar¹

2021

The International Journal of Acoustics and Vibration

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A numerical technique for detection of unbalance magnitude of a rotor-bearing system is proposed and verified by experimental analysis. Dimensional analysis is used for development of mathematical model of an unbalanced rotor-bearing system following rigid rotor approach. A developed mathematical model is solved by factorial regression analysis method using the experimental data obtained by a Box-Behnken design. The proposed approach integrates the rotor parameters, disc parameters, bearing parameters and operating conditions with the synchronous vibration amplitude. Confirmation experiments are conducted using Taguchi design methodology with unbalance mass, rotor speed, mass eccentricity and radial load as parameters with different levels assigned to them.

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“…Some researchers identified and diagnosed rotor unbalance using measured vibration response from a single machine run-down. 36–38 Shamsah 39 proposed a method for estimating rotor unbalance from a single run-up using reduced sensors. Their method is model-based which requires an accurate numerical model of the machine.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the transient response of a speed-varying rotor with sudden unbalance and its application in the unbalance identification

Xia

Ren

Qin

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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It is well known that the sudden unbalance is harmful for rotor systems, since it is in huge amount and has a strong impact. Thus, it is difficult to identify the unbalance from the sudden unbalance response of rotor and very few studies have been done on this topic. This paper focuses on the transient response characteristics of the speed-varying rotor when the sudden unbalance occurs, and the inherent correlation between the unbalance and the transient characteristic quantity. First, different time-dependent functions modelling the loading process of sudden unbalance are derived and compared with the experiment results of the test rotor. The selection principles of function type and duration value are presented. Analyses of transient response characteristics are conducted over the run-up process of the rotor with different parameters of sudden unbalance. Variations of transient response characteristics are summarized into three forms. The varying laws and interrelations of characteristic quantities, and the corresponding parameter region of sudden unbalance are illustrated for each form. Based on the transient analysis results, the momentary positions and angular variations of the rotor disc at some key time instants are illustrated via introducing the key-phase signal. A novel transient-vibration-based method for unbalance identification is proposed. Only a single run-up measurement is required. Numerical experiments verify the effectiveness of the method. In summary, the proposed method can provide a new way for the unbalance identification using the transient response.

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Estimating rotor unbalance from a single run-up and using reduced sensors

Cited by 15 publications

References 14 publications

A Speed-Variant Balancing Method for Flexible Rotary Machines Based on Acoustic Responses

A Speed-Variant Balancing Method for Flexible Rotary Machines Based on Acoustic Responses

A Model To Estimate Synchronous Vibration Amplitude For Detection of Unbalance in Rotor-Bearing System

Investigation on the transient response of a speed-varying rotor with sudden unbalance and its application in the unbalance identification

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