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Grävmaskinsstyrning med en eller två GNSS-mottagare
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2008 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Machine control for excavators with one or two GNSS receivers (English)
Abstract [sv]

Dagens allt högre krav på effektivisering inom byggbranschen har lett till att företagens maskinparker måste moderniseras för att ligga i framkant. Moderniseringen kan vara av olika karaktär däribland införandet av dubbla satellitmottagare på grävmaskiner som NCC Construction vill ha undersökt.

Ett införande av grävsystem med satellitbaserad maskinstyrning, GNSSstyrning, påstås bidra till bland annat effektiviseringen samt en högre noggrannhet. Denna rapport är en jämförelse av det relativt nya systemet som använder två mottagare med det i dagsläget ofta förekommande systemet med enbart en mottagare.

Jämförelsen har gjorts genom fältmätningar, beräkningar baserade på teoretiska modeller samt intervjuer med, inom området, kunnig personal. Rapporten tar även upp ekonomiska aspekter, där beräkningarna är förenklade, för att kunna få en överskådlig bild av kostnaderna och möjliga besparingar för en eventuell framtida investering.

Att uppgradera till grävsystem med dubbla GNSS-mottagare visade inte någon större förbättring vid positionering av skopan. Detta trots att en teoretisk analys visar att positioneringen bör förbättras avsevärt. Orsaken till den uteblivna förbättringen kan vara att för få maskiner undersökts. Undersökningen visar att en så avancerad teknik som GNSS-styrning kräver noggrant underhåll om förväntad noggrannhet ska uppnås. Rent ekonomiskt visar det sig att systemet med två mottagare är ett bra alternativ vid en eventuell nyinvestering. Dock gäller det att omsorgsfullt välja vilken eller vilka grävmaskiner som ska utrustas med systemet beroende på grävmaskinens huvudsakliga arbetsuppgifter.

Abstract [en]

Today's increasing demand for greater efficiency in the construction industry has led to the need for corporate machines to be modernized to keep up with competitors. The modernization can be of different natures, amongst other the introduction of dual satellite based receivers on excavators that NCC Construction want investigated.

The imposition of machine control systems with dual satellite based receivers, GNSS-receivers, is alleged to contribute to efficiency and a higher degree of accuracy. This report is a comparison of the relatively new system that uses two receivers with at this stage frequently used system with only one receiver.

The comparison has been conducted by field measurements, calculations based on theoretical models and interviews with, in the field, qualified staff. The report also deals with economic aspects, in which the calculations are simplified, in order to get an overall picture of the costs and potential savings´for a possible future investment. Upgrading to machine control systems with dual GNSS-receivers did not show any major improvement when positioning the bucket. Despite the fact that a theoretical analysis shows that the positioning should be improved considerably.

The reason for the lack of improvement could be that too few machines were examined. The survey shows that such an advanced technology as GNSS machine control requires careful maintenance in order to achieve expected accuracy. Economically, it appears that systems with two receivers are a good alternative in the event of an investment. However, which of the excavators to be equipped with the system, should be carefully evaluated depending on the excavator main tasks.

Place, publisher, year, edition, pages
2008. , 73 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-95404ISRN: LiU-ITN-TEK-G--08/047--SEOAI: oai:DiVA.org:liu-95404DiVA: diva2:635484
Subject / course
Civil Engineering
Supervisors
Examiners
Available from: 2013-07-05 Created: 2013-07-03 Last updated: 2013-07-05Bibliographically approved

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