Hydraulics and Pneumatics Research Institute

Bucharest, Romania

Hydraulics and Pneumatics Research Institute

Bucharest, Romania

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Cristescu C.,Hydraulics and Pneumatics Research Institute | Radoi R.,Hydraulics and Pneumatics Research Institute | Dumitrescu C.,Hydraulics and Pneumatics Research Institute | Dumitrescu L.,Hydraulics and Pneumatics Research Institute
IOP Conference Series: Materials Science and Engineering | Year: 2017

Starting from some theoretical considerations, the article presents some experimental results on the assessment of dry and viscous friction forces that occur in the operation of hydraulic cylinders, the basic elements from the structure of hydraulic drive systems. It also presents some specific aspects regarding the durability of the seals of hydraulic cylinders, in order to increase lifetime of hydraulic cylinders, respectively lifetime of hydraulic drive systems. © Published under licence by IOP Publishing Ltd.


Dutu I.,Hydraulics and Pneumatics Research Institute | Dumitrescu C.,Hydraulics and Pneumatics Research Institute | Matache G.,Hydraulics and Pneumatics Research Institute
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2013

Smart diagnosis using virtual instrumentation joined the field of proportional electro-hydraulics few years ago, being based on new methods and concepts. The authors developed a virtual instrument for diagnosing proportional electro-hydraulic equipment, obtaining larger flexibility and versatility, shortening the time allocated for reconfiguration and recalibration of equipments mounted on one test stand. There has been obtained a virtual instrument for smart diagnosis that can acquire, condition, process and store data automatically, using a structured database model, thus reducing the intervention of the human factor and increasing accuracy. The virtual instrument has large interconnecting capabilities with other informatics systems and can be reconfigured to be used with other types of hydraulic equipment (e.g. servo valves).


Duminica D.,Polytechnic University of Bucharest | Dutu I.,Hydraulics and Pneumatics Research Institute | Avram M.,Polytechnic University of Bucharest | Gheorghe V.,Polytechnic University of Bucharest
Applied Mechanics and Materials | Year: 2013

Fuzzy objective multioptimization describes performance criteria and constraints in terms of fuzzy membership functions. The membership function of the decision is obtained as conjunction of performance criteria and constraints. A method of allocating tolerance intervals using fuzzy multiobjective optimization is presented for the case of a 3R manipulator. The proposed method is validated through Monte Carlo simulation. © (2013) Trans Tech Publications, Switzerland.


Dutu M.F.,Polytechnic University of Bucharest | Maican E.,Polytechnic University of Bucharest | Dutu I.,Hydraulics and Pneumatics Research Institute | David L.,Polytechnic University of Bucharest | Rusanescu C.O.,Polytechnic University of Bucharest
INMATEH - Agricultural Engineering | Year: 2013

This paper presents the two degrees of freedom of mathematical modelling of a tractor wheel. The tractor is a complex mechanical system that, while traveling, is subjected to vibrations that are transmitted from the running path to the driver. A modelling program was used in order to study the tractor movement on agricultural land. Useful charts were developed for: amplitude variation of the tractor's mass center oscillation, with traveling speed; amplitude variation of the angle of rotation of the tractor around its center of mass; amplitude variation of the driven wheel with speed; driving wheel's amplitude variation; amplitude variation of vertical force acting on driven wheel, with speed; amplitude variation of vertical force acting on driving wheel, with speed. There are also presented the study results for a tractor traveling on a country road. Interpretation of results is based on charts for amplitude variation of the tractor's center of mass, amplitude variation of the angle of rotation of the tractor around its center of mass, amplitude variation of the driving and driven wheel when tractor is moving, amplitude variation of vertical force acting on driving and on driven wheel, with speed.


Blejan M.,Hydraulics and Pneumatics Research Institute | Feodorov A.,Hydraulics and Pneumatics Research Institute | Drumea P.,Hydraulics and Pneumatics Research Institute | Dorgeloh E.,Development and Assessment Institute in Waste Water Technology PIA
2012 IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR 2012 - Proceedings | Year: 2012

The article describes the implementation of a computerized testing system for the fluid power field. The system will be integrated in a e-learning platform for training the employees from the fluid power field in order to increase their competencies and performance. The computerized testing system comprises a database, a test application and an application for introducing and editing questions in the database. © 2012 IEEE.


Cristescu C.,Hydraulics and Pneumatics Research Institute | Dumitrescu C.,Hydraulics and Pneumatics Research Institute | Radoi R.,Hydraulics and Pneumatics Research Institute | Dumitrescu L.,Hydraulics and Pneumatics Research Institute
Tribology in Industry | Year: 2014

The article presents some aspects of developing, within INOE 2000-IHP, of an experimental research on the determination of frictional forces that occur in the mobile sealings of the pistons, between the piston sealings and the inner liner of hydraulic cylinders. In the first part of the paper, are presented some specific elements of the experimental device and of the testing stand which have been developed, while in the second part are presented some graphical results obtained in experimental research, as well as some comments on them. This developed experimental research marks the continuing of a major action on the tribological behavior of mobile hydraulic seals, which are frequently used in the construction of hydraulic cylinders. © 2014 Published by Faculty of Engineering.

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