scholarly journals Fundamental Research on Hydraulic Systems Driven by Alternating Flow

10.14311/1606 ◽  
2012 ◽  
Vol 52 (4) ◽  
Author(s):  
Ioan-Lucian Marcu ◽  
Daniel-Vasile Banyai
Keyword(s):  
Volume Of Fluid ◽  
Hydraulic Systems ◽  
Hydraulic Motor ◽  
New Approach ◽  
Three Phase ◽  
Fundamental Research ◽  
Design And Testing

This paper presents a new approach to rotary hydraulic systems, and the functional principles of rotary hydraulic systems that can work using alternating flows. Hydraulic transmissions using alternating flows are based on bidirectional displacement of a predefined volume of fluid through the connection pipes between the alternating flow, the pressure energy generator and the motor. The paper also presents some considerations regarding the basic calculation formulas, the design and testing principles for a hydraulic motor driven by alternating flow, and also a three-phase rotary hydraulic motor.

Calculation of a closed hydraulic volumetric system

2021 ◽  
pp. 27-30
Author(s):  
Keyword(s):  
Power Plant ◽  
Wind Power ◽  
Hydraulic System ◽  
Working Fluid ◽  
Wind Power Plant ◽  
Hydraulic Systems ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Oil Pump ◽  
Selection Of

An algorithm is proposed for calculating a closed volumetric hydraulic pump-hydraulic motor system using the example of the hydraulic system of a wind power plant, based on the calculation of the hydraulic systems of mobile machines. The main characteristics of the system components, the selection of initial data for the calculation, working fluid and diameters of hydraulic lines are analyzed. Keywords: hydraulic system, energy, fluid, oil, pump, motor, renewable energy source, wind power plant, machine. [email protected]

Hydraulic Components Contribution to Total Power Losses and Acceleration of an Open Loop System With Long Hose

2004 ◽  
Author(s):  
Michael Westman ◽  
Ove Isaksson
Keyword(s):  
Open Loop ◽  
Total Power ◽  
Hydraulic Systems ◽  
Power Losses ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Pressure Losses ◽  
Forest Logging ◽  
Pipe Line ◽  
Valve Block

This paper is concerned with forest logging machinery. A great deal of final felling in cut-to-length method done by harvester, which fells, delimbs and cuts the trees to pre-selected lengths. Two important criteria of a harvester head are that it has to be energy efficient and it has to be as fast as possible. To minimize losses in hydraulic systems the main demand is to reduce pressure losses in high power valves and outer components as much as possible. Each orifice in the flow path results in power losses. This work is an experimental study on power losses and acceleration of hydraulic motor in a system with long hoses. Main hydraulic components included are hydraulic pump, cartridge valve, pipe line and hydraulic motor. The results show that pre-activating the pump improves the system speed. To reduce losses, optimization of valve block, cartridge valve orifices are needed. Accumulators are favourable if combined with high stand-by pressure.

The Design and Testing of a New Approach to Computer-aided Differential Diagnosis

1983 ◽  
Vol 22 (03) ◽  
pp. 156-166 ◽  
Author(s):  
Dana Ludwig ◽  
D. Heilbronn
Keyword(s):  
Statistical Models ◽  
Medical Diagnosis ◽  
Logistic Regression Model ◽  
Medical Knowledge ◽  
Bayes Rule ◽  
Causal Network ◽  
New Approach ◽  
Linear Discriminant ◽  
Computer Aided ◽  
Design And Testing

An algorithm is presented for making diagnostic inferences on the basis of a causal network model of medical knowledge. The algorithm is based on Bayes Rule, but is unique in the way that it accounts for the presence of conditional non-independence of observations and for the presence of multiple diseases in the same patient. An evaluation of the system is performed on a database of patients with chest pain. In this evaluation, the diagnostic accuracy of the system is found to be inferior to that of a logistic regression model and comparable to that of a linear discriminant function. In a review of selected cases from this database, the system can be shown to provide inferences that are not possible with other simpler statistical models. The practicality of this and other computer aids to medical diagnosis is discussed.

Concordia Transform-Based Current Analysis for Induction Motor Diagnosis

2013 ◽  
Vol 569-570 ◽  
pp. 481-488
Author(s):  
Jin Jiang Wang ◽  
Robert X. Gao ◽  
Ru Qiang Yan
Keyword(s):  
Induction Motor ◽  
Instantaneous Frequency ◽  
Low Cost ◽  
Experimental Studies ◽  
Current Analysis ◽  
New Approach ◽  
Non Invasive ◽  
Bearing Defects ◽  
Bearing Defect ◽  
Three Phase

This paper presents a new approach for bearing defect diagnosis in induction motor by taking advantage of three-phase stator current analysis based on Concordia transform. The current signature caused by bearing defect is firstly analyzed using an analytic model. Concordia transform is performed to extract the instantaneous frequency based on phase demodulation. The bearing defect feature is then identified via spectrum analysis of the variation of current instantaneous frequency. Both simulation and experimental studies are performed to demonstrate the effectiveness of proposed method in identifying bearing defects. The method is inherently low cost, non-invasive, and computational efficient, making it a good candidate for various applications.

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