COMPLEX STAND FOR TESTING OF A GEAR PUMPS AND INVESTIGATION OF THE INFLUENCE OF THE HYDRAULIC OIL TEMPERATURE ON THE PUMP CHARACTERISTICS

2019 ◽  
pp. 287-294 ◽  
Author(s):  
Petko Tsankov ◽  
Ivan Binev ◽  
Nikola Marazov
Keyword(s):  
Experimental Study ◽  
Engine Speed ◽  
Test Bench ◽  
Analytical Dependence ◽  
Gear Pump ◽  
Fluid Temperature ◽  
Hydraulic Oil ◽  
Gear Pumps ◽  
Temperature And Pressure ◽  
The Creation

The work is devoted to the creation of a test bench for a gear pump with options for adjusting the parameters: operating fluid temperature, engine speed, pump load. An experimental study of the effect of hydraulic oil temperature on the characteristics of a gear pump has been made. An analytical dependence is proposed to determine the characteristic of a gear pump with regard to the temperature and pressure of the hydraulic oil.

scholarly journals Parameterization, Modeling, and Validation in Real Conditions of an External Gear Pump

2021 ◽  
Vol 13 (6) ◽  
pp. 3089
Author(s):  
Miquel Torrent ◽  
Pedro Javier Gamez-Montero ◽  
Esteban Codina
Keyword(s):  
Working Conditions ◽  
Test Bench ◽  
Fluid Dynamic ◽  
Graph Model ◽  
Field Tests ◽  
Black Box ◽  
Gear Pump ◽  
Volumetric Behavior ◽  
External Gear Pump ◽  
Standard Tests

This article presents a methodology for predicting the fluid dynamic behavior of a gear pump over its operating range. Complete pump parameterization was carried out through standard tests, and these parameters were used to create a bond graph model to simulate the behavior of the unit. This model was experimentally validated under working conditions in field tests. To carry this out, the pump was used to drive the auxiliary movements of a drilling machine, and the experimental data were compared with a simulation of the volumetric behavior under the same conditions. This paper aims to describe a method for characterizing any hydrostatic pump as a “black box” model predicting its behavior in any operating condition. The novelty of this method is based on the correspondence between the variation of the parameters and the internal changes of the unit when working in real conditions, that is, outside a test bench.

scholarly journals Study and Analysis of Anti Vibratory Passive and Active Methods Applied to Complex Mechanical System

2012 ◽  
Vol 7 (2) ◽  
Author(s):  
Cédric Lopez ◽  
François Malburet ◽  
André Barraco
Keyword(s):  
Experimental Study ◽  
Comparative Analysis ◽  
Mechanical System ◽  
High Speed ◽  
Test Bench ◽  
Minimization Method ◽  
Controlled System ◽  
Proper Frequency ◽  
Different Parts ◽  
Methods Of Control

This paper studies problematic of a mechanical system composed of different coupled parts submitted to a high speed shock and proposes analysis of anti vibratory passive and active methods based on an experimental and theoretical coupled approach. After a shock, different parts of the system oscillate. If one of them is excited at a particular frequency, such as its proper frequency, important oscillations appear and can lead to the deterioration of the system by introducing important stresses. In this paper, we propose an analysis in order to understand this kind of problem and what we can do to avoid it. Firstly, we discuss problematic and we expose the studied system. In a second time, we develop two approaches of modeling that allow us to understand the phenomenon by carrying out numerical simulations. Then cross checking of model is completed via experimental study on drop test bench. Passive minimization method of vibrations based on experimental and theoretical coupled approach is exposed. Finally, a comparative analysis of different methods of control and experimental results of controlled system are presented.

Auszugverhalten von Schaftfräsern*/Pull-out behavior of end mills – Experimental study on different clamping devices with various clamping mechanisms

2018 ◽  
Vol 108 (05) ◽  
pp. 353-358
Author(s):  
E. Abele ◽  
F. Ali ◽  
M. Berger
Keyword(s):  
Experimental Study ◽  
Test Bench ◽  
Mechanical Load ◽  
Mechanisms Of Action ◽  
Heavy Duty ◽  
Press Fit ◽  
Pull Out ◽  
The Press ◽  
End Mills ◽  
Tool Position

Aus Schwerzerspanung und Turbinenschaufelfertigung ist bekannt, dass Werkzeuge aus dem Spannfutter ausgezogen werden. Die veränderte Werkzeugposition führt zur Abweichung von den vorgegebenen Toleranzen und einer geringeren Fertigungsqualität oder Beschädigung des Werkstücks. Der Artikel untersucht das Auszugsverhalten verschiedener Spannfutter. Mit einem Prüfstand können die Einflüsse der mechanischen Belastung und der Klemmlänge auf die Haltekraft im Pressverband betrachtet und die Wirkmechanismen beim Auszug des Werkzeuges aus dem Spannfutter sensorisch ermittelt werden.   From heavy-duty cutting and turbine blade manufacturing it is known that tools pull out from chucks. A change in tool position leads to deviations from tolerance and decreases manufacturing quality or damages the workpiece. This article explores the extension behavior of different chucks on a specifically designed test bench. This allows determining how mechanical load and clamping length influence the holding force in the press fit and what mechanisms of action affect the extraction of the tool from the chuck.

Mixed H2/H∞ Observer-Based LPV Control of a Hydraulic Engine Cam Phasing Actuator

2011 ◽  
Author(s):  
Andrew White ◽  
Zhen Ren ◽  
Guoming Zhu ◽  
Jongeun Choi
Keyword(s):  
Engine Speed ◽  
Test Bench ◽  
Linear Models ◽  
Linear Matrix ◽  
Closed Loop System ◽  
Linear Parameter Varying ◽  
The Family ◽  
Lpv Control ◽  
Lpv System ◽  
Variable Valve

In this paper, a series of closed-loop system identification tests was performed for a variable valve timing cam phaser system on a test bench to obtain a family of linear models for an array of engine speeds and oil pressures. Using engine speed and oil pressure as the system parameters, the family of linear models was translated into a linear parameter varying (LPV) system. The engine speed and oil pressure can be measured in real-time by these sensors equipped on the engine, thus allowing their use as scheduling parameters. An observer-based gain-scheduling controller for the obtained LPV system is then designed based on the numerically efficient convex optimization or linear matrix inequality (LMI) technique. Test bench results show the effectiveness of the proposed scheme.

Epidural versus subdural spinal cord cooling: cerebrospinal fluid temperature and pressure changes

2000 ◽  
Vol 70 (1) ◽  
pp. 222-227 ◽  
Author(s):  
Sven A Meylaerts ◽  
Cor J Kalkman ◽  
Peter de Haan ◽  
Marjolein Porsius ◽  
Michael J.H.M Jacobs
Keyword(s):  
Spinal Cord ◽  
Cerebrospinal Fluid ◽  
Fluid Temperature ◽  
Temperature And Pressure ◽  
Pressure Changes

scholarly journals An experimental study of the role of social factors in language change: The case of loanword adaptations

2014 ◽  
Vol 5 (3) ◽  
Author(s):  
Shiri Lev-Ari ◽  
Sharon Peperkamp
Keyword(s):  
Experimental Study ◽  
Social Factors ◽  
Language Change ◽  
Sound Change ◽  
Experimental Setting ◽  
Experimental Paradigm ◽  
Semantic Domain ◽  
The Creation

AbstractThere is great variation in whether foreign sounds in loanwords are adapted or retained. Importantly, the retention of foreign sounds can lead to a sound change in the language. We propose that social factors influence the likelihood of loanword sound adaptation, and use this case to introduce a novel experimental paradigm for studying language change that captures the role of social factors. Specifically, we show that the relative prestige of the donor language in the loanword’s semantic domain influences the rate of sound adaptation. We further show that speakers adapt to the performance of their ‘community', and that this adaptation leads to the creation of a norm. The results of this study are thus the first to show an effect of social factors on loanword sound adaptation in an experimental setting. Moreover, they open up a new domain of experimentally studying language change in a manner that integrates social factors.

Fire behaviour of carbon fibre epoxy composite for aircraft: Novel test bench and experimental study

2015 ◽  
Vol 33 (3) ◽  
pp. 247-266 ◽  
Author(s):  
Pauline Tranchard ◽  
Fabienne Samyn ◽  
Sophie Duquesne ◽  
Matthieu Thomas ◽  
Bruno Estèbe ◽  
...  
Keyword(s):  
Experimental Study ◽  
Carbon Fibre ◽  
Test Bench ◽  
Epoxy Composite ◽  
Fire Behaviour

Computer Prediction of Cyclic Excitation Sources for an External Gear Pump

1985 ◽  
Vol 199 (3) ◽  
pp. 175-180 ◽  
Author(s):  
K Foster ◽  
R Taylor ◽  
I M Bidhendi
Keyword(s):  
Computer Program ◽  
Gear Pump ◽  
Computer Prediction ◽  
Pressure Distributions ◽  
External Gear Pumps ◽  
Theoretical Predictions ◽  
Gear Pumps ◽  
External Gear Pump

A description is given of a computer program for investigating the performance of the external gear pumps under varying conditions with the special emphasis on the examination of pressure distributions within the pump, i.e. excitation forces for the vibration of the pump case and the variation in flow generated by the pump. Measurements are presented for the variation with time of tooth space pressure and the results are compared with the theoretical predictions from the computer program.

Experimental study on graphene-based nanocomposite membrane for hydrogen purification: Effect of temperature and pressure

2019 ◽  
Vol 330 ◽  
pp. 16-23 ◽  
Author(s):  
Rahman Zeynali ◽  
Kamran Ghasemzadeh ◽  
Alireza Behrooz Sarand ◽  
Farshad Kheiri ◽  
Angelo Basile
Keyword(s):  
Experimental Study ◽  
Nanocomposite Membrane ◽  
Effect Of Temperature ◽  
Hydrogen Purification ◽  
Temperature And Pressure
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