scholarly journals Study of the influence of the design parameters of the wet end of the gear pump on the force factors, acting in the gear pump with external gearing, using the software package MATLAB 2018a

2019 ◽  
Vol 492 ◽  
pp. 012007 ◽  
Author(s):  
A Sinitsyna ◽  
B Borisov ◽  
O Gavryushina
Keyword(s):  
Software Package ◽  
Design Parameters ◽  
Gear Pump

Maximizing the Performance of Cased Munitions Under Realistic Constraints

2010 ◽  
Author(s):  
Kenneth C. Walls ◽  
David L. Littlefield ◽  
David E. Lambert
Keyword(s):  
Titanium Alloy ◽  
Software Package ◽  
Test Problem ◽  
Energetic Material ◽  
Design Parameters ◽  
Design Constraints ◽  
Optimization Software ◽  
Optimal Values ◽  
Explosive Detonation ◽  
Case Design

In order to make the process of fragmentation of warhead cases more systematic, we have developed a procedure that makes use of nonlinear optimization to derive optimal values for case design parameters subject to various design constraints. A framework has been developed that makes use of the optimization software package LS-OPT driving the hydrocode CTH (CTH is developed and maintained at Sandia National Laboratories, LS-OPT is commercially available from Livermore Software Technology Corp.). CTH was used to model the explosive detonation and determine the resultant kinetic energy delivered to the case by the energetic material. As an example of application of the framework, a test problem was run using a case configuration consisting alternating titanium alloy and polymer layers.

On Determining Conditions for Optimal Performance of Cased Munitions

2011 ◽  
Author(s):  
Kenneth C. Walls ◽  
David L. Littlefield ◽  
David E. Lambert
Keyword(s):  
Software Package ◽  
Energetic Material ◽  
Design Parameters ◽  
Design Constraints ◽  
Optimization Software ◽  
Optimization Study ◽  
Optimal Values ◽  
Free Parameters ◽  
Explosive Detonation ◽  
Case Design

In order to make the process of fragmentation of warhead cases more systematic, we have developed a procedure that makes use of nonlinear optimization to derive optimal values for case design parameters subject to various design constraints. A framework has been developed that makes use of the optimization software package LS-OPT driving the hydrocode CTH (CTH is developed and maintained at Sandia National Laboratories, LS-OPT is commercially available from Livermore Software Technology Corp.). CTH was used to model the explosive detonation and determine the resultant kinetic energy delivered to the case by the energetic material. In this follow-on effort to a previous study [1], the range of constraints and free parameters used in the optimization study was expanded.

scholarly journals Design Specifications and Performance analysis of Single and Two Stage HB LLC Converters

2019 ◽  
Vol 9 (1S) ◽  
pp. 192-196
Keyword(s):  
Performance Analysis ◽  
Software Package ◽  
Design Procedure ◽  
Input Voltage ◽  
Design Parameters ◽  
Basic Operation ◽  
Two Stage ◽  
Design Specifications ◽  
Converter Topologies ◽  
And Performance

In this paper a Single stage and Two stage Half Bridge LLC (HB LLC) converter topologies for DC/DC applications with low input voltage. The basic operation and design procedure for LLC converter is illustrated. Simulation of the proposed converter is done using the design parameters and the results are discussed and then analysis is done to know its performance. The efficiency of the converters is analyzed by MATLAB Software Package.

Contact Stress in a Gerotor Pump

2003 ◽  
Author(s):  
P. Javier Gamez-Montero ◽  
Esteve Codina
Keyword(s):  
Contact Stress ◽  
Measurement Techniques ◽  
Design Parameters ◽  
Prototype Model ◽  
Gear Pump ◽  
Gear Teeth ◽  
2D Simulation ◽  
Maximum Contact Stress ◽  
Gerotor Pump ◽  
Maximum Contact

The aim of the first part of this paper is to reach the optimum design parameters of a gear set when it works as part of an internal gear pump type gerotor. The performance of the gear teeth and the whole gear set are evaluated through analytical studies to obtain the maximum contact stress in gear teethe and the volumetric characteristics. Several gear sets have been examined and the results are presented. The aim of the second part of the this paper is to documents a better understanding of the performance of a crankshaft mounted gerotor pump for IC engines lubrication. Modeling, simulation and experimental work have been examined for a specific unit. A preliminary 2D simulation is carried out by using the Finite Element Method (FEX) to calculate the maximum contact stress. At the testing phase, a prototype model of the gear set provides the maximum contact stress on a pair of teeth by using photoelasticity measurement techniques. The results are exposed and discussed and possible alterations are proposed.

SnAP: A Comprehensive Software Package for the Simulation of Serial Manipulators

2008 ◽  
Author(s):  
E. A. Gonza´lez-Barbosa ◽  
M. A. Gonza´lez-Palacios ◽  
L. A. Aguilera-Corte´s
Keyword(s):  
Software Package ◽  
Inverse Kinematics ◽  
Closed Loop ◽  
Computer Control ◽  
Design Parameters ◽  
Graphical Interface ◽  
Matrix Formulation ◽  
Embedded Control ◽  
Serial Manipulators ◽  
Actual Configuration

The solution of kinematics problem for serial manipulators is fundamental for their analysis, simulation and computer control, for this reason, this paper introduces the software package called SnAP (Serial n-Axes Manipulators), which is developed under the ADEFID framework [1], where the manipulator is conceptualized as a derived class from CRobokin, CMachine and CIpiSModel, which are fundamental ADEFID classes. SnAP has been developed with efficient algorithms in a closed-loop solution to solve direct kinematics, whereas for the case of inverse kinematics, matrix formulation, elimination and numerical methods are implemented. Furthermore, for the architecture definition, the user is able to display a dialog box in which the design parameters are set while the solid model is updated simultaneously showing the actual configuration. Since ADEFID provides tools to graphical interface with embedded control components, SnAP adopted them to not only simulate virtually, but also with a parametric prototype designed for this purpose.

Parametric Studies for Thermal Design of Surface Mounted Components of Standard Electronic Modules

1992 ◽  
Vol 114 (3) ◽  
pp. 300-304 ◽  
Author(s):  
A. Hadim ◽  
N. J. Nagurny
Keyword(s):  
Software Package ◽  
Network Models ◽  
Thermal Design ◽  
Design Parameters ◽  
Network Analyzer ◽  
Thermal Network ◽  
Carrier Materials ◽  
Parametric Studies ◽  
Carrier Size ◽  
Cavity Floor

Parametric studies are performed on heat transfer in surface-mounted components of conduction cooled Standard Electronic Modules (SEMs). Thermal network models are developed for the various components that are used in the SEMs. The models are validated by comparing the results with available experimental results from various test modules. An interfacing software package for thermal analysis (IN-STAN) is used to generate the thermal network representations of the models and a thermal network analyzer is used to perform the analysis. Several studies are performed to analyze the effects of important thermal design parameters including: chip and carrier size, cavity floor thickness, air gap thickness, die and carrier materials, and solder material.

Passive Regulation of Thermally Induced Axial Force and Displacement in Microbridge Structures

2017 ◽  
Vol 84 (12) ◽  
Author(s):  
Pezhman Hassanpour ◽  
Patricia M. Nieva ◽  
Amir Khajepour
Keyword(s):  
Analytical Model ◽  
Axial Force ◽  
Software Package ◽  
Coefficient Of Thermal Expansion ◽  
Thermomechanical Behavior ◽  
Design Parameters ◽  
Thermally Induced ◽  
Sensitivity Equations ◽  
Special Cases ◽  
Castigliano’S Theorem

The analytical model of a mechanism for regulating the thermally induced axial force and displacement in a fixed–fixed microbeam is presented in this article. The mechanism which consists of a set of parallel chevron beams replaces one of the fixed ends of the microbeam. The thermomechanical behavior of the system is modeled using Castigliano’s theorem. The effective coefficient of thermal expansion is used in the analytical model. The analytical model takes into account both the axial and bending deformations of the chevron beams. The model provides a closed-form equation to determine the thermally induced axial force and displacement in the microbeam. In addition, the model is used to derive the equations for the sensitivities of the microbeam’s axial force and displacement to the variations of the design parameters involved. Moreover, the model produces the stiffness of the chevron beams. The effect of the stiffness of the chevron beams on the dynamic behavior of the microbeam is discussed. The analytical model is verified by finite element modeling using a commercially available software package. Using the analytical model, two special cases are highlighted: a system with thermally insensitive axial force and a system with thermally insensitive axial displacement. The main application of the model presented in this article is in the design of sensors and resonators that require robustness against changes of temperature in the environment. The analytical model and the sensitivity equations can be easily integrated into optimization algorithms.

GEROLAB Package System: Innovative Tool to Design a Trochoidal-Gear Pump

2009 ◽  
Vol 131 (7) ◽  
Author(s):  
P. J. Gamez-Montero ◽  
R. Castilla ◽  
R. Mujal ◽  
M. Khamashta ◽  
E. Codina
Keyword(s):  
Contact Stress ◽  
Design Parameters ◽  
Gear Pump ◽  
Hydraulic Pump ◽  
The Past ◽  
Performance Indexes ◽  
Gerotor Pump ◽  
Innovative Tool ◽  
Volumetric Characteristics ◽  
System Methodology

An innovative tool for the improvement of the design methodology of a trochoidal gear, which works as a part of a hydraulic pump, is introduced. For the past few years, new, specific, and demanding applications of this type of pumps have demanded to maximize efficiency and to reduce manufacturing costs by improving its two main performance indexes: volumetric characteristics and teeth contact stress. The existing methodologies and software fail to thoroughly address the design by taking into account both performance indexes. The software presented is an integrated package system, which is composed of three basic modules: design, volumetric characteristics, and contact stress module. As a result, by consecutively following each module, this new tool allows to find the better gear set for the concrete initial required design parameters. An application using the GEROLAB package system methodology is carried out to obtain the best candidate, which is compared and contrasted with a gear set of a specific gerotor pump unit. As a conclusion, this new software aims to lead the designer to a better design by improving performance indexes of a new born gerotor pump project.

A Hybrid LP/FE Model for the Dynamic Analysis of External Gear Pumps

2007 ◽  
Author(s):  
Emiliano Mucchi ◽  
Valerio Venturi ◽  
Giorgio Dalpiaz
Keyword(s):  
Finite Element ◽  
Internal Surface ◽  
Element Model ◽  
Design Parameters ◽  
Fe Model ◽  
Gear Pump ◽  
Time Varying ◽  
Pump Operation ◽  
Lumped Parameter ◽  
Lp Model

In this work a hybrid lumped-parameter finite-element model of an external gear pump for automotive applications is presented and experimentally assessed; the finite element (FE) model regards the external parts of the pump (case and end plates) while the lumped-parameter (LP) model regards the interior parts (bushes and gears). The LP model is a non linear kineto-elastodynamic model and includes the most important phenomena involved in the pump operation as time-varying oil pressure distribution on gears, time-varying meshing stiffness and hydrodynamic journal bearing reactions. A forced vibration analysis has been carried out by means of the FE model for the evaluation of the acceleration levels on the external surfaces of the pump; for this analysis, the damping has been estimated using data coming from an experimental modal analysis (EMA) whereas the excitation forces, acting on the internal surface of the case due to bearing reactions and pressure forces, have been obtained from the LP model. In this sense the model is globally a hybrid LP/FE model. The model has been assessed using experiments: the experimental accelerations measured during run-up tests have been compared with the simulated accelerations coming from the FE/LP model. Finally the assessed model has been used in order to identify the effects of design parameters in terms of case vibrations.

Theoretical flowrate characteristics of the conjugated involute internal gear pump

2012 ◽  
Vol 227 (4) ◽  
pp. 730-743 ◽  
Author(s):  
Hua Zhou ◽  
Wei Song
Keyword(s):  
Control Volume ◽  
Design Parameters ◽  
Gear Pump ◽  
Fluid Delivery ◽  
Delivery Performance ◽  
Gear Pumps ◽  
Tooth Number ◽  
Internal Gear ◽  
Double Envelope ◽  
Control Volume Approach

The aim of this article is to study the theoretical flowrate characteristics of the conjugated involute internal gear pump. The conjugated involute internal gear pump has a different internal gear, the profile of which is completely conjugated to that of pinion, from the conventional involute internal gear pump. To describe briefly, the former pump is called ‘conjugated pump’ while the latter pump ‘conventional pump’. This structure makes the conjugated pump have smaller volumes of trapped fluid than the conventional pump, which indicates the conjugated pump has a better flowrate performance. Although there have been numerous investigations into gear pumps, none of them have dealt with the conjugated pumps yet. This article presents a systematic study on the theoretical flowrate characteristics of the conjugated pumps. It is expected to obtain some generalized conclusions to guide the design of internal gear pumps. Firstly, a double envelope concept is applied to derive the mathematical models of the conjugated involute internal gear couple. Next, mesh characteristics of the gear couple, which mainly decide the fluid delivery performance of the pumps, are analyzed. Finally, using a control volume approach, the theoretical flowrate characteristics of the pump under different design parameters of gears are investigated. Results show the conjugated pump has a better performance than the conventional one. To design a conjugated pump with good flowrate characteristics, it’s feasible to choose a proper shifting coefficient, a larger tooth number of the pinion, a smaller tooth number of the internal gear, a larger pressure angle and a larger fillet radius, under the condition that no tooth interference occurs.

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