An Analysis of Unsteady Torque on a Two-Dimensional Radial Impeller

Imaichi, Kensaku; Tsujimoto, Yoshinobu; Yoshida, Yoshiki

doi:10.1115/1.3241815

Cited by 8 publications

(5 citation statements)

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“…Pump-type load torque can be quasi-steady. 18 Therefore, D and K are approximately zero. The first equation in equation (1) can then be rewritten as follows …”

Section: Theoretical Analysismentioning

confidence: 99%

“…Unsteady flows around radial impellers are analyzed using singularity methods on a two-dimensional radial impeller, as proposed by Imaichi et al. 18 Unsteady torque can be divided into three components, namely, quasi-steady, apparent mass, and wake and can be expressed in a mathematical equation. 17…”

Section: Theoretical Analysismentioning

confidence: 99%

“…In fact, hydraulic torque may be the main part of pump load. Unsteady flows around radial impellers are analyzed using singularity methods on a two-dimensional radial impeller, as proposed by Imaichi et al 18 Unsteady torque can be divided into three components, namely, quasi-steady, apparent mass, and wake and can be expressed in a mathematical equation. 17 Quasi-steady torque component results from instantaneous velocity disturbance on blades.…”

Section: Analysis Of Unsteady Torque Of a Centrifugal Pumpmentioning

confidence: 99%

See 2 more Smart Citations

Induction motor current signature for centrifugal pump load

Luo

Yuan

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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Sensorless monitoring technology based on motor current signature analysis is a nonintrusive and economical technique to monitor motor-driven equipment. Sensorless monitoring technology can be applied to a centrifugal pump system. This technology is also based on the motor current signature of centrifugal pump load; however, systematic research regarding motor current signature in overall normal operation points which is the applied basic for sensorless monitoring technology has been rarely performed. As such, we partially examined the motor current signature of a centrifugal pump load by experimental observation, theoretical analysis, and numerical simulation. Results show that stator current is a sinusoidal alternating current that strictly follows sine law associated with the cycle of the fundamental frequency of supply power. The trend of the root mean square and peak–peak of current is the same as flow–shaft power characteristics; hence, this trend could be used as indicator of the pump operational point monitor. The frequency characteristics of a centrifugal pump, such as blade passing frequency, rotation frequency, and broadband noise, could be reflected as sidebands around the fundamental frequency. The stator current spectrum is composed of fundamental frequency component, harmonics component, and noise. The fundamental frequency component is directly related to the pump load in which changes associated with the law of fundamental frequency component are relatively similar to flow–shaft power characteristics. Harmonics component and noise are caused by load fluctuation in which the amount of energy of these two components exhibits a lower value at the preferred operation point. By contrast, the amount of energy likely increases when pump operation is at an unstable operation point. These results further indicate that motor current signature analysis is a feasible and cost-effective method to monitor centrifugal pump operation status. Therefore, motor current signature analysis can be applied to monitor-related flow phenomena.

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“…Pump-type load torque can be quasi-steady. 18 Therefore, D and K are approximately zero. The first equation in equation (1) can then be rewritten as follows …”

Section: Theoretical Analysismentioning

confidence: 99%

Section: Theoretical Analysismentioning

confidence: 99%

Section: Analysis Of Unsteady Torque Of a Centrifugal Pumpmentioning

confidence: 99%

See 1 more Smart Citation

Induction motor current signature for centrifugal pump load

Luo

Yuan

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…λ s is the stator flux. For a quasi-steady load, 33 the disturbance on λ s caused by torque fluctuation is rather weak, λ s keeps nearly unchanged. Therefore, it could be deducted that the electromagnetic torque T e is approximately proportional to i sT , which means the oscillation features of T e could be reflected in the stator current indirectly.…”

Section: Theoretical Principlesmentioning

confidence: 99%

Operation diagnosis for centrifugal pumps using stator current-based indicators

Han

Yuan

Luo

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Motor current signature analysis (MCSA) used in the diagnosis of centrifugal pumps has become a hot topic due to its non-intrusive and cost-effective nature. Yet, traditional current-based diagnosis methods show limitations as massive computation and power frequency interference. Moreover, most of them focus on the fault detection, fewer discuss the applications in operation evaluation. Therefore in this article, the hydro-mechanical-electric coupling effect that exists in the induction motor-centrifugal pump system is analyzed systematically. On this foundation, novel indicators that can reflect the harmonic distortion and noise proportion of stator current signals, and further indicate the hydraulic stability and operation status are proposed. Theoretical and experimental analysis support this paper, and results have demonstrated that our proposed indicators can indicate the operation change, identify the optimal operation region, and reflect the development of cavitation for centrifugal pumps. These indicators have the advantages of easy calculation and identification, therefore can be conveniently compared with accepted standards and enable immediate remedial actions to be implemented to ensure the stable operation.

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“…The centrifugal pump transfers energy to the fluid through the impeller's rotation during operation, and the blades are subjected to the combined action of liquid pressure, gravity, and centrifugal force. The torque generated by the fluid pressure acting on the blades will produce an unsteady reverse torsional moment of the impeller, and the characteristics of this unsteady torsional moment will change with the operating conditions of the centrifugal pump and the changes in the internal flow state [1]. At present, many studies have carried out a lot of research based on the centrifugal pump speed is approximately constant; that is, the speed is regarded as a continuous value in the numerical simulation, and significant results have been achieved in the pressure pulsation, vibration, and noise in the centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

A multi-field coupling simulation model for the centrifugal pump system

Dong

Shuai

et al. 2023

Mechanics & Industry

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In this paper, a multi-field coupling simulation model, including the motor, shaft, and pump, is established to analyze the motor's influence and the shaft on the pump's operating status. First of all, different forms of simulation calculation models are established according to each device's characteristics. Then, the Predictor-Corrector Newmark-β method (PC Newmark-β method) is used to calculate the operating status of the motor, shaft, and pump under mutual influence. Finally, the validity of the simulation model is verified by comparing the experimental data. The results show that the centrifugal pump, shaft, and motor should be viewed as a complete system to analyze. The torque and speed of different equipment are interrelated and influenced. In addition, the dynamic characteristics of the shaft will also cause the fluctuation of the pump's operating speed. The fluctuation of the centrifugal pump impeller's rotational speed further affects the characteristics of the pressure pulsation on the wall of the centrifugal pump, which is finally reflected in the vibration characteristics of the pump casing.

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An Analysis of Unsteady Torque on a Two-Dimensional Radial Impeller

Cited by 8 publications

References 0 publications

Induction motor current signature for centrifugal pump load

Induction motor current signature for centrifugal pump load

Operation diagnosis for centrifugal pumps using stator current-based indicators

A multi-field coupling simulation model for the centrifugal pump system

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