Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Development and design of a driver’s chair: - The continued development of the 3B driver’s chair concept
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2001 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Utveckling och konstruktion av en förarstol : - En vidareutveckling av stolskonceptet 3B (Swedish)
Abstract [en]

The driver’s environment in todays trucks is being continually improved to increase the drivers

comfort and safety. One of the most influencing factors of the driving experience is the driver’s chair.

The purpose of this master thesis was to continue the development of a new driver’s chair, based on a

pilot study and a number of patents from Scania CV AB. The aim of this development was to create

one or several concept chairs, ready for further prototyping and analysis. The concept(s) were to be

constructed using CAD software, thus verifying dimensions and functions. Beyond this, the concept(s)

were to be calculated and simulated for structural integrity during a crash.

A product development process divided into three phases, information gathering, concept development

and construction, was used. During the first phase, information was collected with the purpose of

increasing subject knowledge, identifying user demands and mapping out useable technologies. In the

second phase, product development, a product specification was created and idea solutions were

generated. Eight pilot concepts were created from the generated ideas. The concepts were transformed

into CAD mock-ups, verifying movement patterns and secondary functions. Finally, the concepts were

evaluated and selected with the aid of quantitative evaluation methods.

The selected concept differed somewhat from the patents, but kept the same basic method of chair

suspension. These differences were caused by forced adaptations of the concept structure to conform

to product specifications. In the third phase, mechanical construction was performed in parallel with a

master thesis aiming to simulate and verify crash testing of the concept. An iterative loop between

construction and simulation was set up to quickly create a robust chair frame. With the frame properly

designed and evaluated, the chair’s secondary functions could be designed and applied.

The resulting concept was deemed to have the potential to conform to product demands, in some cases

outperforming the current chair models. The biggest advantages of the concept were increased safety

due to the sturdy frame, a suspension independent of chair settings and a potentially lower weight. One

specific demand was that the concept must be able to fit in all of the cabs in Scanias cab range.

Concessions and trade-offs in chair geometry and structure had to be made to meet this goal. This led

to an increase in the complexity of the structure and the elimination of some of the patents inherent

strengths, but secured cab compatibility and kept in important comfort functions. The conclusion was

that the pilot study and the patents were considered possible to put into practice, but in a less effective

and optimal way compared to what was originally thought to be possible. Removing or reducing the

demand on cab compatibility, the concept was still deemed to be able to reach its full potential with

additional development.

Abstract [sv]

Förarmiljön i dagens lastbilar är under ständig förbättring. En av de faktorer som påverkar detta mest

är förarstolen, som då blir mycket viktig för den totala körupplevelsen. Syftet med detta

examensarbete var att vidareutveckla en förstudie och ett antal patent kring en ny stolsstruktur

utvecklad på Scania CV AB. Denna vidareutveckling skulle riktas mot att skapa ett eller flera

fungerande stolskoncept som var redo för vidare prototyptillverkning. Detta för att bättre kunna avgöra

och testa patentens gångbarhet i verkligheten. De eventuella koncepten skulle realiseras som CADritningar

samt även verifieras ur krocksäkerhetssynpunkt.

En produktutvecklingsmodell uppdelad i tre faser; informationssamling, konceptutveckling och

konstruktion, användes. Under den första fasen insamlades information i syfte att skapa en ökad

förståelse kring problemet, kartlägga teknik och konkurrenter samt att identifiera användarbehov. I den

andra fasen, konceptutvecklingsfasen, fastslogs en kravspecifikation, varefter idéer genererades och

sammanslogs till koncept. Enkla CAD-skisser gjordes av koncepten i syfte att utvärdera dessa. Val av

koncept gjordes med värderingsmetoder, bland annat Pugh-matris, QFD och FMEA.

Det valda konceptet skiljde sig på vissa punkter från patenten, men bibehöll samma fjädringsprincip.

Denna skillnad berodde på att anpassningar i strukturen var tvungna att göras för att kunna uppfylla de

uppsatta kraven. I den tredje fasen utfördes konstruktionsarbetet parallellt med ett examensarbete mot

krockberäkning. Detta arbete utfördes i en iterativ loop för att snabbt åstadkomma en hållbar

grundstruktur. Med en beräknad och dimensionerad grundstruktur kunde delfunktioner utformas och

läggas till.

Den resulterande konstruktionen hade potential att uppfylla alla de ställda kraven och överträffade i en

del fall den existerande stolsstrukturens egenskaper. Konceptets största fördelar var främst den ökade

krocksäkerheten, inställningsoberoende fjädringsegenskaper samt den potentiellt lägre vikten. Arbetet

mot att få stolen att passa i samtliga av Scanias hyttvarianter, medförde att vissa eftergifter i

konstruktionen var tvungna att göras. Med detta säkrades hyttanpassningen och alla delfunktioner på

bekostnad av ökad komplexitet och förlorandet av vissa av patentens inneboende fördelar. Slutsatsen

av detta var att förstudien och patenten ansågs vara möjliga att realisera, men på ett funktionsmässigt

mindre effektivt vis än vad som var tänkt. Genom att bortse från ett av hyttkraven bedömdes konceptet

och patenten ändå kunna nå sin fulla potential vid framtida vidareutveckling.

Place, publisher, year, edition, pages
2001.
Series
MMK 2009:50 MCE 191
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-99892OAI: oai:DiVA.org:kth-99892DiVA: diva2:542582
External cooperation
Scania CV AB,Krister Lindquist
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-08-02 Created: 2012-08-02 Last updated: 2012-08-02Bibliographically approved

Open Access in DiVA

David Anerfält(8892 kB)754 downloads
File information
File name FULLTEXT01.pdfFile size 8892 kBChecksum SHA-512
39743ce546e65d1e2174972e9e1ec8a287518a982106ef8058e36de7c7aa052ee53bfc4701f4ab11b115079d305ac4694d8104d30a647b8b13437b5ded9762b2
Type fulltextMimetype application/pdf

By organisation
Machine Design (Dept.)
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 754 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 324 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf