Unsteady forces generated by fluid flow through the impeller shroud leakage path of a centrifugal pump were investigated. The effect of leakage path inlet swirl (pump discharge swirl) on the rotordynamic forces was re-examined. It was observed that increasing the inlet swirl is destabilizing both for normal and tangential rotordynamic forces. Attempts to reduce the swirl within the leakage path...

For a high-speed centrifugal pump, cavitation occurs easily. To equip high-performance splitter-bladed inducer upstream of the pump is an effective method to suppress cavitation. In this paper, external characteristics experiment with carried out, and corresponding numerical calculations are completed. The research shows that results calculation credible. Numerical under eight different tip cle...

Abstract — This paper proposed a sequential diagnosis method using fuzzy neural network called “partially-linearized neural network (PNN)”, by which the fault types of rotating machinery can be precisely and effectively distinguished at an early stage on the basis of the possibilities of symptom parameters. The non-dimensional symptom parameters (NPS) in time domain are defined for reflecting t...

This paper presents a fault diagnosis method for a centrifugal pump system with frequency-domain symptom parameters by using the wavelet transform, rough sets and a fuzzy neural network to detect faults and distinguish fault types at an early stage. The wavelet transform is used for feature extraction across an optimum frequency region. The diagnosis knowledge for the training of neural network...

Centrifugal pumps are divided into two main components, namely the impeller and volute. The is a rotating pump component, while volute stationary component. current problem in industrial world that capacity operates not accordance with written so does work optimally. In addition, structural analysis of minimally carried out damage to often occurs. To overcome this, it necessary analyze performa...

This paper deals with the combination of system identiica-tion and robust controller design. Recent results on estimation of frequency domain model uncertainty are utilized in robust analysis and controller design using. It is shown how estimated frequency domain uncertainty ellipses may be represented within the general-framework using a mixed perturbation set. A methodology for synthesizing o...

The management of a population of centrifugal pumps in the petrochemical industry can be daunting. A popular method for strategically optimizing the maintenance and operation of these centrifugal pumps is to measure the reliability of the whole pump population in terms of Mean-Time-Between-Failures (MTBF). Too often MTBF improvement becomes the focus rather than a means of supporting the actual...