Evaluating boom height control performance with variable boom roll damping in a suspended boom system on self-propelled sprayers

dc.contributor.advisor Matthew Darr
dc.contributor.author Mellott, Evan
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2019-08-21T14:04:54.000
dc.date.accessioned 2020-06-30T03:15:34Z
dc.date.available 2020-06-30T03:15:34Z
dc.date.copyright Wed May 01 00:00:00 UTC 2019
dc.date.embargo 2001-01-01
dc.date.issued 2019-01-01
dc.description.abstract <p>In this research, a method for improving spray boom height stability was developed and tested. Self-propelled sprayers played a critical role in agriculture by applying chemicals to crops to control the presence of weeds and pests. The spraying process needed to be controlled in a manner such that the spray boom maintained the necessary target height for uniform coverage. Deviation from target height allowed outside factors such as wind to become more prevalent during chemical application which generated opportunities for spray drift to occur and potentially harm neighboring crops and environment.</p> <p>On a suspended spray boom system, terrain influences on the chassis as well as height activation of individual wings induced boom roll that generated target height errors along the length of the boom. This research examined areas of opportunity for applying variable damping rates to boom roll with the intent of managing unwanted boom roll. Intelligent control of boom roll damping rates could minimize induced boom roll and improve target height control of the boom.</p> <p>Virtual modeling software was utilized during the variable damping development process in order to simulate induced boom roll scenarios and evaluate successful application methods. Magnetorheological dampers provided the ability to further analyze variable damping methods on a full-sized sprayer in a field operating environment. A control system was designed using inputs from the sensors on the sprayer to detect induced boom roll and trigger increases in damping rates momentarily.</p> <p>Increased damping rates proved to mitigate boom roll motion relative to the sprayer chassis. However, boom height control was only considerably improved when variable damping was applied during significant chassis roll events. In many instances, controlling boom roll motion with variable damping rates induced error into the chassis roll angle, therefore still creating boom height error.</p> <p>Semi-active control of boom roll influenced the dynamics of both the spray boom and chassis. There were many critical factors that impacted the target height control of the spray boom. The suspension systems of the spray boom and chassis influenced one another and should therefore be considered jointly when developing methods for boom target height control.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/17055/
dc.identifier.articleid 8062
dc.identifier.contextkey 14821164
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/17055
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/31238
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/17055/Mellott_iastate_0097M_17850.pdf|||Fri Jan 14 21:14:57 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Mechanical Engineering
dc.subject.keywords Boom roll
dc.subject.keywords Dampener
dc.subject.keywords Spray boom
dc.subject.keywords Sprayer
dc.subject.keywords Suspension
dc.subject.keywords Variable damping
dc.title Evaluating boom height control performance with variable boom roll damping in a suspended boom system on self-propelled sprayers
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
thesis.degree.discipline Agricultural and Biosystems Engineering
thesis.degree.level thesis
thesis.degree.name Master of Science
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