scholarly journals The Influence of Gear Micropump Body Asymmetry On Stress Distribution

2017 ◽  
Vol 24 (1) ◽  
pp. 60-65 ◽  
Author(s):  
Wacław Kollek ◽  
Piotr Osiński ◽  
Urszula Warzyńska
Keyword(s):  
Gear Pump ◽  
Stress Distributions ◽  
Hydraulic Systems ◽  
Pump Operation ◽  
Maximal Stress ◽  
Pump Housing ◽  
Calculation Results ◽  
Pumping Unit ◽  
Strength And Stiffness ◽  
Favorable Conditions

Abstract The paper presents the results of numerical calculations of stress distributions in the gear micropump body for applications in hydraulic systems, especially in the marine sector. The scope of the study was to determine the most favorable position of bushings and pumping unit in the gear pump body in terms of stress and displacement distribution in the pump housing. Fourteen cases of gear pump bushings and pumping unit locations were analyzed: starting from the symmetrical position relative to the central axis of the pump, up to a position shifted by 2.6 mm towards the suction channel of the pump. The analysis of the obtained calculation results has shown that the most favorable conditions for pump operation are met when the bushings are shifted by 2.2 mm towards the suction channel. In this case the maximal stress was equal to 109 MPa, while the highest displacement was about 15μm. Strength and stiffness criteria in the modernized pump body were satisfied.

scholarly journals Psychoacoustic Evaluation of Hydraulic Pumps

2021 ◽  
Vol 13 (13) ◽  
pp. 7320
Author(s):  
Tobias Pietrzyk ◽  
Markus Georgi ◽  
Sabine Schlittmeier ◽  
Katharina Schmitz
Keyword(s):  
Sound Pressure ◽  
Paired Comparison ◽  
Hydraulic Drive ◽  
Operating Parameter ◽  
Gear Pump ◽  
Hydraulic Systems ◽  
Hydraulic Pump ◽  
Listening Tests ◽  
Internal Gear ◽  
Axial Piston

In this study, sound measurements of an axial piston pump and an internal gear pump were performed and subjective pleasantness judgements were collected in listening tests (to analyze the subjective pleasantness), which could be seen as the inverse of the subjective annoyance of hydraulic drives. Pumps are the dominant sound source in hydraulic systems. The noise generation of displacement machines is subject of current research. However, in this research only the sound pressure level (SPL) was considered. Psychoacoustic metrics give new possibilities to analyze the sound of hydraulic drive technology and to improve the sound quality. For this purpose, instrumental measurements of the acoustic and psychoacoustic parameters are evaluated for both pump types. The recorded sounds are played back to the participants in listening tests. Participants evaluate them regarding the subjective pleasantness by means of paired comparison, which is an indirect scaling method. The dependence of the subjective pleasantness on speed and pressure was analyzed for both pump types. Different regression analyses were carried out to predict the subjectively perceived pleasantness or annoyance of the pumps. Results show that a lower speed is the decisive operating parameter for reducing both the SPL and the annoyance of a hydraulic pump.

Stress Distributions in an Elastic Body due to Molecular Interactions Considering One-Dimensional Periodic Material Distribution Based on Mindlin Solution

2018 ◽  
Author(s):  
Hiroshige Matsuoka ◽  
Toshiki Otani ◽  
Shigehisa Fukui
Keyword(s):  
Stress Distribution ◽  
Elastic Body ◽  
Molecular Interactions ◽  
Material Distribution ◽  
Stress Distributions ◽  
One Dimensional ◽  
Calculation Results ◽  
Basic Characteristics ◽  
The One

A method to calculate the stress distributions in the elastic body caused by the molecular interactions has been established. The stress distribution was calculated based on the Mindlin’s solution considering the one-dimensional periodic material distribution. The calculation results for a distribution of two materials were presented. The basic characteristics of the stress distribution in the elastic body were quantitatively clarified.

Dependence of gear-pump operation on viscosity of the metered liquid

1990 ◽  
Vol 21 (6) ◽  
pp. 453-455
Author(s):  
V. I. Stupa ◽  
Yu. A. Chernyshov
Keyword(s):  
Gear Pump ◽  
Pump Operation

scholarly journals Perancangan Sistem Hidrolik pada Unit Mobile Core Sampler

2017 ◽  
Vol 1 (1) ◽  
pp. 33
Author(s):  
Fitria Adhi Geha Nusa ◽  
Sugiyanto Sugiyanto
Keyword(s):  
Hydraulic System ◽  
New Product ◽  
Prime Mover ◽  
Hydraulic Systems ◽  
Hydraulic Pump ◽  
Inside Diameter ◽  
Core Sampler ◽  
Calculation Results ◽  
Tank Capacity ◽  
The Difference

Sugarcane core sampler is a plantation equipment sector which collect sugar cane samples and determining of rendemen in sugarcane. Sugarcane core sampler is a new product made by PT. United Tractors Pandu Engineering to solve problem about determining of individual rendemen in sugarcane at sugar mill. In operation Sugarcane Core Sampler uses a hydraulic system as the prime mover, either to raise the platform, take samples of cane and push it out of the probe cylinder. In order for the hydraulic system to work optimally, it is necessary to design and calculate the specification of components to be used on tilting cylinders, ejector, hydraulic pump, and reservoir (hydraulic tank). It also conducted a discussion of the difference between the Core Sampler Sugarcane fixed and mobile models. From the calculation results obtained inside diameter tilting cylinder is Ø100 mm with rod cylinder Ø56 mm, inside diameter of ejector cylinder is Ø32 mm with rod cylinder Ø1 8mm. At the biggest pump flow required is 51.81 lpm and displacement 43 cc/rev, from result of calculation hence specified pump which used is pist on pump type with displacement 41 cc/rev. For hydraulic tank capacity requiredon all hydraulic systems is 177 liters.

scholarly journals Visualization research on the influence of an ultrasonic degassing system on the operation of a hydraulic gear pump

2018 ◽  
Vol 211 ◽  
pp. 03005 ◽  
Author(s):  
Piotr Antoniak ◽  
Jarosław Stryczek ◽  
Michał Banaś ◽  
Oleksandr Lyhovskyi ◽  
Ihor Gryshko ◽  
...  
Keyword(s):  
High Speed ◽  
Theoretical Description ◽  
Working Fluid ◽  
Operating Parameters ◽  
Gear Pump ◽  
Hydraulic Systems ◽  
Chemical Methods ◽  
Physical Methods ◽  
Working Medium ◽  
Gear Pumps

Gear pumps make a group of the most popular hydraulic energy generators. Research and development works concerning those units have been going on for decades, and thanks to them gear pumps feature very good operating parameters. However, even well-designed gear pumps will not work properly if the physical properties of the working fluid are incorrect. One of such properties is compressibility of the fluid, which largely depends on the amount of gas dissolved in the medium. For this reason, the aim is to reduce the amount of gas dissolved in the working medium. It can be done using both chemical and physical methods. Because chemical methods can affect the chemical composition of the working fluid, it is the physical methods that are usually used in hydraulic systems. This paper presents preliminary visualization research into the influence of an ultrasonic degassing system on the operation of a hydraulic gear pump. Apart from that, operation of such a system and its theoretical impact on the work of the gear pump is discussed Experimental study, using a high-speed camera, was carried out in order to verify the theoretical description.

Finite Element Static Analysis on Heavy-Duty Truck Gearbox Housing

2010 ◽  
Vol 37-38 ◽  
pp. 491-495 ◽  
Author(s):  
Jing Shun Fu ◽  
Jun Feng Wang ◽  
Jin Wang
Keyword(s):  
Finite Element ◽  
Load Case ◽  
Heavy Duty ◽  
Analysis Model ◽  
Contact Algorithm ◽  
Finite Element Software ◽  
Heavy Duty Truck ◽  
Calculation Results ◽  
Design Requirements ◽  
Strength And Stiffness

The heavy-duty truck’s gearbox housing is studied in this paper. The analysis model is built with finite element software. MPC (multipoint constraint) contact algorithm is used to simulate the connections between different gearbox housings. The strength and stiffness of gearbox housing is calculated at its low-speed load case in the first gear. The contour of the stress and displacement is obtained through the calculation results. The results show that the housing meets the design requirements and it provides a reference for optimization and improvement of the gearbox housing.

Analysis of Gear Pump Designed for Manufacturing Processes

2015 ◽  
Vol 803 ◽  
pp. 163-172
Author(s):  
Jan Labaj ◽  
Stefan Husar
Keyword(s):  
Discharge Tube ◽  
Volume Fraction ◽  
Velocity Fields ◽  
Manufacturing Processes ◽  
Gear Pump ◽  
Phase Flow ◽  
Hydraulic Systems ◽  
Two Phase ◽  
Simulation Calculation ◽  
Pressure Surge

The model for the analysis of the gear pump work designed for the hydraulic systems was made for the 3D non-stationary two-phase flow using CFD software. In this paper, we made the simulation calculation of the pressure surge when opened between gear space in the discharge tube while the liquid is pumped. At the same time, we detected the pressure, velocity fields and the volume fraction of the steam in the gear pump space. The paper presents the resultant of the forces and the moments acting on the gears and possible sites of cavitation in the area of the gear pump and on its bearings. All the obtained results have been examined in the practical manufacturing processes.

Structural Response of Sandwich Beams with Different Facing Materials Subjected to Bending

2017 ◽  
Vol 21 ◽  
pp. 294-300
Author(s):  
Iuliana Dupir ◽  
Nicolae Ţăranu ◽  
Cristina Vlădoiu ◽  
Dragoş Ungureanu ◽  
Vlad Lupăşteanu
Keyword(s):  
Numerical Analysis ◽  
Structural Response ◽  
High Strength ◽  
Specific Weight ◽  
Foam Core ◽  
Sandwich Beams ◽  
Stress Distributions ◽  
Structural Functions ◽  
Strength And Stiffness ◽  
Lightweight Core

Sandwich elements with structural functions are widely used in engineering applications, offering outstanding advantages, such as high strength and stiffness compared to its low specific weight. The sandwich elements consist in two stiff and thin faces, separated by a thick and lightweight core. A numerical analysis is performed in this paper, in order to evaluate the flexural structural response of sandwich beams with foam core and various facing materials. It has been noticed that the deflections decrease when the stiffness of the facings increase. The results are represented in terms of maximum deflections and direct stress distributions.

Fracture Analysis of an Aluminum Alloy Gear Pump Housing

2016 ◽  
Vol 723 ◽  
pp. 288-293
Author(s):  
Ping Li ◽  
Yan Jie Zhao ◽  
Chun Qing Ma
Keyword(s):  
Visual Inspection ◽  
Optical Microscope ◽  
Gear Pump ◽  
Loading Capacity ◽  
Casting Defects ◽  
Exterior Surface ◽  
Initiation And Propagation ◽  
Pump Housing ◽  
Lower Material ◽  
Brittle Cleavage Fracture

The gear pump housing in bulldozer, which was made of cast Al-Si alloy, was found to break in two halves during running. In order to determine fracture reason of the gear pump housing failure analysis in detail were conducted by visual inspection, optical microscope and scanning electron microscope (SEM), chemical analysis, hardness inspection. Visual inspection showed that the crack source has a white semicircle on the interior side of the section and propagated toward the exterior surface of the housing with obvious radial state. Meanwhile, the inner wall has the wear trace in depth of 0.1 mm due to boring phenomenon. SEM observation indicated brittle cleavage fracture mechanism with many casting defects such as dendritic shrinkage and inclusion as well as initiated crack in gear pump housing. The casting defects probably promoted the initiation and propagation of the crack and decreased the loading capacity of the gear to impacting force from the inside shaft. The analysis results show that the failure of gear pump housing mainly resulted from serious boring phenomenon, dendritic shrinkage and the lower material performance.

scholarly journals FEATURES OF TRANSITION MODES OF FRICTION SURFACES WITH PARTIALLY REGULAR MICRORELIEF

Aviation ◽  
2018 ◽  
Vol 22 (3) ◽  
pp. 86-92 ◽  
Author(s):  
Oleksandr Radionenko ◽  
Myroslav Kindrachuk ◽  
Oleksandr Tisov ◽  
Andrii Kryzhanovskyi
Keyword(s):  
Effective Means ◽  
Textured Surface ◽  
Gear Pump ◽  
Hydraulic Systems ◽  
Textured Surfaces ◽  
Lubrication Regimes ◽  
Lubrication Regime ◽  
Transition Modes ◽  
Friction Surfaces ◽  
And Control

Textured surfaces with partially regular micro relief (PRMR) are reported to be an effective means to control lublication. It was found they are good wear debris trap and suppliers of lubricant directly to the actual friction area. Their tribological properties depend on the clearance between mating surfaces, relative slip speed, direction of motion. These parameters change the lubrication regime, and vice versa changing geometry of PRMR it is possible to predict and control lubrication regime for given conditions. Application of micro textured surface is prospective for high precision sliding units – valve slides of oil and hydraulic systems, faces of gear pump gears, ring-to-cylinder interface of aircraft reciprocating engines etc. providing high service life. On other side, changing texture parameters it is possible to stop the leakage of fluid through the gap, what may be efficiently utilized in aircraft non-contacting mechanical (hydrodynamic and hydrostatic) seals of gas compressors and gear mechanisms. This paper discloses some peculiarities of transition lubrication regimes for textured surfaces in lubricated contact.

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