Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages

Bibliographic Details
Main Author:	Ali, Hessein
Language:	English
Published:	University of Dayton / OhioLINK 2015
Subjects:	Mechanical Engineering
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=dayton1444820035

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-dayton14448200352021-08-03T06:33:29Z Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages Ali, Hessein Mechanical Engineering This thesis presents a methodology for synthesizing planar linkages to approximate any prescribed periodic function. The mechanisms selected for this task are the slider-crank and the geared five-bar with connecting rod and sliding output (GFBS), where any number of drag-link (or double crank) four-bars are used as drivers. A slider-crank mechanism, when comparing the input crank rotation to the output slider displacement, produces a sinusoid-like function. Instead of directly driving the input crank, a drag-link four-bar may be added that drives the crank from its output via a rigid connection between the two. Driving the input of the added four-bar results in a function that is less sinusoid-like. This process can be continued through the addition of more drag-link mechanisms to the device, progressively altering the curve toward any periodic function with a single maximum. For periodic functions with multiple maxima, a GFBS is used as the terminal linkage added to the chain of drag-link mechanisms. The synthesis process starts by analyzing one period of the function to design either the terminal slider-crank or terminal GFBS. A randomized local search or MATLAB's fmincon command is then conducted as the four-bars are added to minimize the structural error between the desired function and the input-output function of the mechanism. These two optimization techniques are used to acquire the best results of the structural error. Mechanisms have been "mgrown" in this fashion to dozens of links that are capable of closely producing functions with a variety of intriguing features. 2015 English text University of Dayton / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=dayton1444820035 http://rave.ohiolink.edu/etdc/view?acc_num=dayton1444820035 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Mechanical Engineering
spellingShingle	Mechanical Engineering Ali, Hessein Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages
author	Ali, Hessein
author_facet	Ali, Hessein
author_sort	Ali, Hessein
title	Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages
title_short	Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages
title_full	Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages
title_fullStr	Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages
title_full_unstemmed	Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages
title_sort	reducing structural error in function generating mechanisms via the addition of large numbers of double-crank linkages
publisher	University of Dayton / OhioLINK
publishDate	2015
url	http://rave.ohiolink.edu/etdc/view?acc_num=dayton1444820035
work_keys_str_mv	AT alihessein reducingstructuralerrorinfunctiongeneratingmechanismsviatheadditionoflargenumbersofdoublecranklinkages
_version_	1719438986554900480

Reducing Structural Error in Function Generating Mechanisms Via the Addition of Large Numbers of Double-Crank Linkages

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