Designing a Pumping System of Gear Pumps Featuring the Involute Internal Gearing

2011 ◽  
Vol 490 ◽  
pp. 64-75
Author(s):  
Damian Słodczyk ◽  
Jarosław Stryczek
Keyword(s):  
Computer Program ◽  
Design Process ◽  
Design Algorithm ◽  
Pumping System ◽  
Hydraulic Machines ◽  
Gear Pumps ◽  
Engineering Drawings

On the basis of the analysed references it has been shown that an important problem in designing hydraulic machines is to develop a method of designing a pumping system of pumps with the internal gearing, which would integrate designing gears and compenstion elements. The authors of the paper has defined a design algorithm that consists of three basic stages: designing a concept of the system, designing the gear subsystem, and designing the compensation subsystem. The design process at particular stages have been described, and the results have been presented in engineering drawings. An original computer program 'Internal Pumping Set' which enhances the process of designing the pumping system has been created. An application of the program has been presented, and a design of an exemplary pumping system made.

scholarly journals Study of the Start Point of Optimization Trajectories for Complex Strategies of the Circuit Design Process

2021 ◽  
Vol 20 ◽  
pp. 133-139
Author(s):  
Alexander Zemliak
Keyword(s):  
System Design ◽  
Design Process ◽  
Circuit Design ◽  
Initial Point ◽  
Point Selection ◽  
Design Algorithm ◽  
Optimal Position ◽  
Starting Point ◽  
Dividing Surface ◽  
Selection Of

The different design trajectories have been analyzed in the design space on the basis of the new system design methodology. Optimal position of the design algorithm start point was analyzed to minimize the CPU time. The initial point selection has been done on the basis of the before discovered acceleration effect of the system design process. The geometrical dividing surface was defined and analyzed to obtain the optimal position of the algorithm start point. The numerical results of the design of passive and active nonlinear electronic circuits confirm the possibility of the optimal selection of the starting point of the design algorithm.

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.

Improving the Performance of Centrifugal Pumps in Serial and Parallel Configurations Using Digital Twins

2019 ◽  
Author(s):  
Andrés L. Carrillo Peña ◽  
Jeffer S. Eugenio Barroso ◽  
Alberto A. Martínez Vesga ◽  
Sebastián Roa Prada ◽  
Victor A. Ardila Acuña
Keyword(s):  
Experimental Data ◽  
Operating Conditions ◽  
Water Supply Systems ◽  
Strong Impact ◽  
Simulation Environment ◽  
Centrifugal Pumps ◽  
Digital Twin ◽  
Pumping System ◽  
Digital Twins ◽  
Hydraulic Machines

Abstract Centrifugal pumps are devices commonly used in countless industrial and residential applications, from water supply systems to oil and gas processing plants. These rotatory hydraulic machines have a strong impact on the energy consumption of industry worldwide, not only because of their vast amount but also because of their continuous operation. Therefore, developing techniques to improve the efficiency of pumping systems is of great help to make communities and industrial activity more sustainable. The overall performance of these pieces of machinery cannot be fully predicted by means of analytical procedures due to the complexity of the fluid flow phenomena that occurs in their interior, so it is common practice to resort to alternate modeling techniques, such as computer aided numerical analysis, which can predict the performance of a pump, given its CAD computer model. However, the performance of an actual centrifugal pump may deviate from its ideal behavior due to multiple causing factors which may alter the performance curves given by the manufacturers in the corresponding data sheets. The discrepancies between the real and the simulated responses of centrifugal pumps demand for better modeling and simulation techniques to improve the design of more efficient pumping systems. Digital twins have the ability to bring the simulation environment closer to reality, by replicating the behavior of the physical system in a simulation environment with the support of experimental data. The digital twin of a multiple pumps system with serial and parallel configurations was developed, based on two identical industrial centrifugal pumps available in the laboratory. Experimental data was collected to calibrate the digital twin system so that the simulated system can predict the response under changing operating conditions. The simulation environment was developed with the assistance of a commercial Computational Fluid Dynamics computer program. After validating the behavior of the virtual components, with respect to the behavior of their actual counterparts, tests were carried out to predict the behavior of the pumping system in case of downstream disturbances which can affect the operating point of the overall pumping system and its corresponding efficiency. The development of the digital twin for the pumping system allowed visualizing how the pumps connected in series or in parallel can be maneuvered to adjust its operating conditions to achieve higher efficiency operating conditions in response to changes in the conditions downstream in the pipeline.

Design and Research on a Hydraulic Cylinder With Plastic Components

2016 ◽  
Author(s):  
Piotr Stryczek ◽  
Franciszek Przystupa ◽  
Michał Banaś
Keyword(s):  
Design Process ◽  
Construction Material ◽  
Hydraulic Cylinder ◽  
Economic Benefits ◽  
Theoretical Research ◽  
Design Solution ◽  
Design Algorithm ◽  
Definitive Method ◽  
The Future ◽  
Hydraulic Cylinders

In mechanical engineering, there is a trend to use new materials which are an alternative to metals. This also applies to construction components and hydraulic systems, where more and more attempts are made to use plastics as construction material. This solution brings design, technological and economic benefits. The researchers from the Fluid Power Research Group of the Department of the Fundamentals of Machine Design and Tribology from Wroclaw University of Technology (www.fprg.pwr.wroc.pl), are working in this area, with an objective to create a complete hydraulic system whose basic elements such as the pump, valve and actuator are, entirely or in their substantial part, made of plastics. The paper presents the course and outcome of the design process and the research, the aim of which was to prepare a demonstration model of the hydraulic cylinder made of plastics. The work on the model of the actuator started from an analysis of traditional methods of designing hydraulic cylinders made of metal. The authors analyzed the course of the design process, paying particular attention to aspects of the strength of the actuators’ structure. It highlights the main elements and the important nodes occurring in the hydraulic cylinders, namely the sleeve, the bottom, the head, the piston, the piston rod, the fasteners, the hydraulic fluid ducts, the sealing, and the bolts. An algorithm for the procedure in a form of a block diagram was presented, and the necessary calculations were made. Taking the characteristics of the actuator and its respective nodes into consideration, it was found that a number of metal parts may be replaced by plastics. The result of the operations performed is the proposal of a model of the actuator elements made of plastics. For this solution, a 3D computer model was prepared and studied by means of the FEM. The obtained results allowed the identification of the place, the nature and the value of deformation. Based on the results of the theoretical research, it was found that the structure of the actuator will not be effected in the course of its work in the assumed conditions. A demonstration model of the actuator was created according to initial assumptions. The next step was to prepare and conduct preliminary studies on the actual model. The first tests were carried out with no load being applied. The tests were made with different speeds of the piston rod’s movement and the operation of the actuator was observed. Next, tests of the loaded actuator model were conducted. For that purpose, it was put on a special stand with a metal actuator in such a way that a linear displacement of the two rods along a common axis was provided. In that system, the conventional actuator enabled the loading of the model’s piston rod. Tests were carried out at different values of pressure and speed within the full motion range. Based on the prototype’s volumetric efficiency measurement results, the operation of the tested actuator featuring the elements made of plastic was proved correct. The theoretical and experimental research on the hydraulic actuator confirm the possibility of applying plastics as a construction material in devices of that type. The use of the actuators’ design algorithm showed that it can provide a theoretical basis for the design method of the actuators made of plastics. The algorithm, however, requires modifications taking into account the special properties of plastics due to their anisotropic nature. The development of a definitive method is planned in the context of further research. Additionally, the future development of a design solution for a cylinder of smaller dimensions, which could provide an alternative to traditional low-pressure actuators or pneumatic actuators. The future research direction is the analysis of the processes taking place in the individual parts of the plastic cylinders. A challenge of some kind may be to select sealing’s that will ensure long and trouble-free operation of the actuators.

Protection of Hydraulic Systems against Dynamic Loads Using Multi-Valve Approach

2014 ◽  
Vol 1036 ◽  
pp. 547-552 ◽  
Author(s):  
Aleksander Gwiazda ◽  
Agnieszka Sękala ◽  
Wacław Banaś ◽  
Zbigniew Monica
Keyword(s):  
Design Process ◽  
Hydraulic System ◽  
Integrated Approach ◽  
Dynamic Loads ◽  
Design Solution ◽  
Technical Solution ◽  
Hydraulic Systems ◽  
Modeling Tools ◽  
Hydraulic Machines ◽  
Independent Design

The paper presents the method of designing equipment for protection the hydraulic system, and particularly hydraulic machines, against dynamic loads. The example of such machine is a powered mining support. A support must work in the conditions related with rock crumps what causes large and quick energy releasing. The designing process bases on the integrated approach what let taking into consideration all needed elements of this process [1,. Each of the elements of the design process could be an independent design agent which could find its solution both in CAD technique and other modeling tools [3,4]. Moreover in the paper is presented the results of computer analysis of the presented solution. This design solution bases on the application, in the protected hydraulic system, two complementary valves: the quick-release valve and the large-caliber one. Analysis of this valve system allow to state that this technical solution should protect a hydraulic system against dynamic loads of any energy.

Results from Use of an Integrated Schedule for Drawing Development and Equipment Procurement

1990 ◽  
Vol 6 (03) ◽  
pp. 180-190
Author(s):  
James R. Wilkins
Keyword(s):  
Computer Program ◽  
Production Planning ◽  
Design Process ◽  
Ship Design ◽  
Principal Result ◽  
Construction Process ◽  
Database Program ◽  
Construction Schedule ◽  
To Receive

As part of an SP-4 project, a computer program was developed to produce integrated schedules for drawing development of drawings and equipment procurement. The program also can be used either to develop a schedule for the fabrication and assembly stages of the construction process or to receive data from an existing construction schedule. In either case, the construction data are used to ensure that drawings are produced and equipment is purchased in time to support production planning. The program uses a commonly available database program, is suitable for use on a minicomputer, and will allow a network of terminals to be used to enter data and obtain reports. This paper reports on the results of applying this scheduling program to a simulated shipbuilding program and highlights a number of significant results. The principal result was to clearly demonstrate that planning for the purchase of equipment must take into account the needs of the ship design process for data about the equipment being procured.

Computerised Tooth Profile Generation of Conjugated Involute Internal Gears

2013 ◽  
Vol 572 ◽  
pp. 355-358 ◽  
Author(s):  
Cuneyt Fetvaci
Keyword(s):  
Computer Program ◽  
Mathematical Models ◽  
Tooth Profile ◽  
Tooth Surface ◽  
Gear Pumps ◽  
Tooth Surfaces ◽  
Internal Gear ◽  
The Given ◽  
Gear Profile

This paper studies the conjugated involute profile which are used in internal gear pumps. In this type of gear mechanisms, the internal gear profile is completely conjugate of the external gear profile. A composite line of action curve is obtained because the root fillets also play role in engagement cycle. The perfomance of the mechanism is increased. By applying consequent transformations, firstly the tooth surface of the generated external gear is obtained and secondly the tooth surface of the conjugated involute internal tooth surface is obtained. Also asymmetric tooth is considered. Mathematical models of generating and generated tooth surfaces are given. Based on the given mathematical models, a computer program is developed to obtain generating and generated surface. Conventional and conjugated involute profiles are compared.

Numerical Analysis of External Gear Pumps Including Cavitation

2012 ◽  
Vol 134 (8) ◽  
Author(s):  
D. del Campo ◽  
R. Castilla ◽  
G. A. Raush ◽  
P. J. Gamez Montero ◽  
E. Codina
Keyword(s):  
Contact Point ◽  
Sudden Change ◽  
Three Dimensional ◽  
Numerical Approach ◽  
Volumetric Efficiency ◽  
Complex Flow ◽  
Circular Pipes ◽  
External Gear Pumps ◽  
Hydraulic Machines ◽  
Gear Pumps

Hydraulic machines are faced with increasingly severe performance requirements. The need to design smaller and more powerful machines rotating at higher speeds in order to provide increasing efficiencies has to face a major limitation: cavitation. The problem is inherently three-dimensional, due to the axial clearances, the relief and circumferential grooves, and to the circular pipes through which the fluid enters and exits the pump. A simplified two-dimensional numerical approach by means of computational fluid dynamics (CFD) has been developed for studying the effect of cavitation in the volumetric efficiency of external gear pumps. The assumptions employed prevent from predicting realistic values of the volumetric efficiency, but show to be valid to understand the complex flow patterns that take place inside the pump and to study the influence of cavitation on volumetric efficiency. A method for simulating the contact between solid boundaries by imposing changes in viscosity has been developed. Experiments of unsteady cavitation in water and oil performed by other authors have been numerically reproduced using different cavitation models in order to select the most appropriate one and to adjust its parameters. The influence of the rotational speed of the pump has been analyzed. Cavitation in the suction chamber very effectively damps the water hammer associated to the sudden change of the contact point position at the end of the gearing cycle. At high rotational speeds, the volume of air becomes more stable, reducing the flow irregularity. When cavitation takes place at the meshing region downstream from the contact point, the volume of air that appears acts as a virtual second contact point, increasing the volumetric efficiency of the pump.

scholarly journals Selection of Control Vector Switching Points for Circuit Optimization

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Lyapunov Function ◽  
Dynamic System ◽  
Design Process ◽  
Time Derivative ◽  
Computational Cost ◽  
Optimal Structure ◽  
Control Vector ◽  
Processor Time ◽  
Design Algorithm ◽  
Cpu Time

The process of optimizing the circuit is formulated as a controlled dynamic system. A special control vector has been defined to redistribute the computational cost between circuit analysis and parametric optimization. This redistribution will help solve the task of optimizing the circuit for minimum CPU time. In this case, the task of optimizing the circuit with minimal CPU time can be formulated as the classical optimal control problem for minimizing some functional. The concept of the Lyapunov function of a controlled dynamic system is used to analyze the main characteristics of the design process. An analysis of the Lyapunov function and its time derivative makes it possible to predict the optimal structure of the control vector for constructing an optimal or quasi-optimal circuit design algorithm. The results are based on the previously discovered effect of accelerating the design process. In this case, the optimal structure of the control vector is determined, which minimizes processor time.

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