A Methodology Based on Cyclostationary Analysis for Fault Detection of Hydraulic Axial Piston Pumps

Casoli, Paolo; Bedotti, Andrea; Campanini, Federico; Pastori, Mirko

doi:10.3390/en11071874

Cited by 19 publications

(12 citation statements)

References 31 publications

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“…It is therefore appropriate that it has an almost constant value. Welding together all of the numeric values in this constant, it is appropriate to set (30) with C•sinδ = 1.3 ÷ 1.9, as experience suggests conservatively. In Formula (30), Q must be expressed in L/s, f 1 in cm 2 , b in m of water column, and l in cm, and it is possible to note that, if a given valve has operated satisfactorily in a pump with flow Q 0 and number of rounds n, it will be able to work equally well in any other pump in which the product Q 0 n is the same value.…”

Section: Additional Effects and Their Influencementioning

confidence: 99%

Design of Delivery Valve for Hydraulic Pumps

et al. 2018

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After briefly recalling the main problems that arise in the study of globe valves for alternative pumps, a methodology has been set up in order to refine the design. The obtained method has the advantages of simplicity and independence from empirical diagrams. In summary, from the obtained equation, the suitable values of the parameters can be deduced, based on the assigned data (capacity Q0 and number of rounds n) of all the dimensions of the valve or of the valves. Depending on the parameter values, it is possible to identify the most suitable kind of valve: a single dish-shaped valve, a ring valve, a valve with several rings or a group of valves.

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Section: Additional Effects and Their Influencementioning

confidence: 99%

Design of Delivery Valve for Hydraulic Pumps

et al. 2018

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“…Usually, the main problem when a pump works in conditions of incomplete filling is not the lack of flow rate itself, but the strong pressure oscillations originated by the back flow in the variable chambers. The intense fluid-born noise also generates a vibration of the pump casing (structure-borne noise) that be clearly identified by means of the techniques used for the fault detection [8]. A specific study on the identification of the conditions of incomplete filling in gerotor pumps, based on acceleration signals, can be found in [9].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Filling Capability in Vane Pumps

2019

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In positive displacement pumps, the main volumetric loss at high speed is due to the incomplete filling of the variable volume chambers. The prediction of the limit speed and of the maximum flow rate delivered by a pump can be obtained only through Computational Fluid Dynamics (CFD) simulations, since the shape, the orientation, and the movement of the chambers with respect to the inlet volume must be considered, along with the non-uniform distribution of the gaseous phase, due to the dissolved air release. In this paper, the influence of different geometric parameters on the filling of a vane pump has been investigated through the commercial software PumpLinx®. At first, a model of a reference pump has been created and validated with different configurations of the suction flow area, then a simplified model has been used for assessing the influence of the geometry of the rotating assembly. It was found that a pump with a low ratio between the axial thickness and the diameter has a higher volumetric efficiency if the chambers are fed from one side only. Opposite behaviors were found in the case of pumps with small diameters and high thicknesses. Moreover, the filling could be improved by increasing the number of chambers, and by reducing the diameter of the rotor, even only locally.

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“…It helped to improve monitoring, diagnosis and characterisation of systems in the rotating machine and telecommunication fields. Very recently several publications discuss the use of cyclostationarity in different technological fields [4,5]. In this paper we will be using these cyclostationary tools for the first time for turbulent machines.…”

Section: Introductionmentioning

confidence: 99%

Software Sensor for Airflow Modulation and Noise Detection by Cyclostationary Tools

Albacha

Rambault

Sakout

et al. 2020

Sensors

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The paper presents tools to model low speed airflow coming from a turbulent machine. This low speed flow have instabilities who generate noise disturbances in the environment. The aim of the study proposed in this paper, is the using of cyclostationary tools with audio signals to model this airflow and detect the noisy frequencies to eliminate this noise. This paper also deals with the extraction in real time of the frequency corresponding to the noise nuisance. This extraction makes it possible to build a software sensor. This software sensor can be used to estimate the air flow rate and also to control a future actuator which will reduce the intensity of the noise nuisance. This paper focuses on the characteristic of the sound signal (property of cyclostationarity) and on the development of a software sensor. The results are established using an experimental setup representative of the physical phenomenon to be characterised.

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A Methodology Based on Cyclostationary Analysis for Fault Detection of Hydraulic Axial Piston Pumps

Cited by 19 publications

References 31 publications

Design of Delivery Valve for Hydraulic Pumps

Design of Delivery Valve for Hydraulic Pumps

Simulation of the Filling Capability in Vane Pumps

Software Sensor for Airflow Modulation and Noise Detection by Cyclostationary Tools

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