An analysis and design tool for evaluation of integrated antenna diversity systems in portable wireless devices

2003 ◽  
Author(s):  
P. Irazoqui-Pastor ◽  
E. Swanson ◽  
C. Short ◽  
J.T. Bernhard
Keyword(s):  
Design Tool ◽  
Antenna Diversity ◽  
Wireless Devices ◽  
Analysis And Design ◽  
Diversity Systems ◽  
Integrated Antenna

Correlation Coefficient Calculation and Simulation in Antenna Diversity

2012 ◽  
Vol 220-223 ◽  
pp. 1949-1952
Author(s):  
Ling Ling Kan ◽  
Hong Wei Liang ◽  
Bing Kun Gao ◽  
Xiu Fang Wang ◽  
Hong Li
Keyword(s):  
Correlation Coefficient ◽  
Smart Antenna ◽  
Closed Form Solution ◽  
Form Solution ◽  
Design Tool ◽  
Fourth Generation ◽  
Antenna Diversity ◽  
Pattern Diversity ◽  
Pattern Distribution ◽  
Diversity Systems

Smart antenna is the critical technique of the third mobile communication, and will become the key technology in the fourth generation communication. The benefits of pattern diversity increase as the incoming pattern distribution becomes more isotropic, so that the research on correlation coefficient in antenna diversity is very critical. This research reviews the related definitions of antenna diversity as well as the related parameters, and then introduces our algorithm to develop closed form solution to calculate correlation coefficient, which provides a generalized method of determining the efficacy of an antenna diversity system. The correlation coefficient calculation is simulated with MATLAB. The simulation results show that the method is efficient and flexible, which will serve as a design tool when constructing pattern diversity systems.

GDVFS: A New Toolkit for Analysis and Design of Vegetative Filter Strips Using VFSMOD

2010 ◽  
Vol 45 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Ramesh P. Rudra ◽  
Bahram Gharabaghi ◽  
Saleh Sebti ◽  
Neelam Gupta ◽  
Ashwini Moharir
Keyword(s):  
Phosphorus Removal ◽  
Design Tool ◽  
Vegetative Filter Strips ◽  
Bacteria Transport ◽  
Filter Strips ◽  
Analysis And Design ◽  
Vegetative Filter Strip ◽  
Removal Efficiencies ◽  
Computational Procedures ◽  
Main Components

Abstract The Guelph design tool for vegetative filter strips, GDVFS, is a toolkit for the analysis and design of vegetative filter strips (VFSs). The upland hydrology model UH and the vegetative filter strip model VFSMOD (the two main components of GDVFS) were adopted from an existing interface (VFSMOD-W), and new nutrient and bacteria transport add-ons for UH and VFSMOD were incorporated into GDVFS. Other utilities and tools were also included in GDVFS to provide a capable toolkit for the analysis and design of VFSs. The published evaluation of computational procedures used in GDVFS indicates that these procedures perform very well in the estimation of VFS sediment and phosphorus removal efficiencies. According to these results, comparison of the predicted and observed values for sediment and phosphorus removal efficiencies indicates 10 and 20% error, respectively. This paper provides descriptions on the capabilities and methodology followed in the GDVFS toolkit.

Modal Analysis of Magnetic Resonance Imaging (MRI) Scanner Support Structure

2018 ◽  
Author(s):  
Geneviève Rodrigue ◽  
Chris K. Mechefske
Keyword(s):  
Modal Analysis ◽  
Vibration Isolation ◽  
Natural Frequencies ◽  
Design Tool ◽  
Mode Shapes ◽  
Resonance Imaging ◽  
Support Structure ◽  
Analysis And Design ◽  
Passive Vibration Isolation ◽  
Magnetic Resonance Imaging Mri

Experimental and computational modal analysis has been completed as part of a larger project with the ultimate goal of understanding MRI vibration and implementing passive vibration isolation in the MRI machine support structure. The specific purpose of the modal analysis is to extract natural frequencies (eigenvalues) and mode shapes (eigenvectors) of the MRI support structure in order to validate the computational model of the base against the experimental results so that the former may be used as an analysis and design tool. From the model, the resonance points of the MRI support structure are determined within the expected frequency ranges of excitation.

Graphical Spreadsheets as Convenient Tools for Turbomachinery Education

2001 ◽  
Author(s):  
Timothy F. Miller
Keyword(s):  
Software Package ◽  
Design Tool ◽  
Design Tools ◽  
Primary Reason ◽  
Educational Design ◽  
Analysis And Design ◽  
Radial Pump ◽  
And Function ◽  
Design Aspect ◽  
Spreadsheet Software

An unfortunate aspect of engineering education in general, and turbomachinery education in specific, has been the difficulty of incorporating the design aspect of instruction with the time-consuming components that make up theoretical instruction. The primary reason for this difficulty is the extremely limited time (typically three months) allocated to teach turbomachinery as a senior-level quarter or semester technical elective. It is desirable to develop an educational design tool that can be simultaneously exercised by a student to perform various design tasks and function as a means of theoretical instruction. Such a tool can permit the students both greater depth and breadth of exposure and may be subsequently used by the students in their future capacity as professional engineers. In this paper, this tool is illustrated by several applications of a commercial “graphical spreadsheet” software package (MathCAD, though others such as Mathmatica and Macsyma are appropriate as well). Some graphical spreadsheet design tools are presented, and these tools are applied to the analysis and design of a radial pump, centrifugal compressor, and radial-inflow turbine.

A Numerical Method for the Analysis of the Theoretical Flow in Crescent-Type Internal Gear Machines With Involute Teeth Profile

2019 ◽  
Author(s):  
Dinghao Pan ◽  
Andrea Vacca
Keyword(s):  
Numerical Method ◽  
Fluid Dynamic ◽  
Analytical Formula ◽  
Simulation Models ◽  
Design Tool ◽  
Multiple Control ◽  
Analysis And Design ◽  
Lumped Parameter ◽  
Control Volumes ◽  
Internal Gear

Abstract Lumped parameter approaches for the description of the flow displaced by hydrostatic pumps and motors have proven to be very effective for both analysis and design purposes. However, while these methods are relatively easy to implement for most of the existing design architectures for positive displacement machines, the case of a crescent-type internal gear machine (CIGM) presents clear challenges as it pertains to the definition of lumped control volumes within the machine. This paper proposes an original scheme for defining lumped control volumes within a CIGM with involute teeth profiles, which is suitable for developing fluid dynamic simulation models for CIGMs. The proposed method strictly obeys fundamental rules on continuous volumes required by lumped parameters models. This is achieved by defining not only multiple control volumes for each displacement chamber but also two variable porting volumes to respect the volume conservation. To prove the validity of the proposed numerical method, the paper provides comparisons between the displaced volume found by the proposed lumped parameter approach and the theoretical kinematic flow ripple provided by an analytical formula available from literature. The results show how the method can be used as a design tool for CIGMs, and particularly to further develop lumped parameter simulation models for detailed fluid dynamic analysis of CIGMs.

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