Looking at wood through the skin: A multidisciplinary approach to explore the tactile quality of wood materials

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Kyttä, Marketta, Prof., Aalto University, Department of Built Environment, Finland
dc.contributor.author Bhatta, Shiv Raj
dc.date.accessioned 2020-03-23T10:00:05Z
dc.date.available 2020-03-23T10:00:05Z
dc.date.issued 2020
dc.identifier.isbn 978-952-60-3808-7 (electronic)
dc.identifier.isbn 978-952-60-3807-0 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/43615
dc.description.abstract This thesis is focused on the developing knowledge base for exploiting the tactile quality of wood materials to improve the user perception of thermal comfort and satisfaction. Through the multidisciplinary approach, sensory, emotional, and thermal perception based on touch sense was studied using various wooden surfaces with various treatment and modification solutions. Psychophysical methods were utilized to collect the perceptual data and various tools were developed for experimentation. Results showed that wood surfaces can elicit emotional component of touch during the tactile exploration of surfaces using finger-tips. Natural surfaces with smooth finishing were perceived positively while coated surfaces that felt a bit sticky-to-touch are evaluated negatively. It seems that preserving the naturalness of wood surface during product development is necessary for retaining the positive emotional component of touch in the wood-products. Perception of topographic attributes of wood surfaces was affected due to the surface treatment methods and modification solutions applied to them. Nevertheless, we still can preserve the naturalness of the surface and promote positive touch experiences, after (sometimes) unavoidable surface treatments or modification solutions, by creating desired sensory attributes of surfaces. The good tactile warmth of wood, in comparison to other building materials, could be exploited to create a thermally comfortable living environment by influencing the perception of the surface temperature to its inhabitants. Results from psychophysical tests showed that subjects can reliably discriminate various natural and modified wood surfaces from each other based on the perception of tactile cold sensation. This is an important reason why we should take into account the thermal properties of wooden surfaces before the application of various treatment and modification solutions. Results offer important insights on how we can improve the tactile warmth of natural wood and other wood-based material surfaces, for example, floorings. The next step taken in the present study was the quantification of temperature perception. The psychophysical parameters were applied to measure the perceptual similarities and differences in the temperature perception between paired surfaces from pine and oak, and pine and ceramic tile. Pine surface at 20 °C, the oak surface at 20.9 °C, and ceramic tile surface kept at 22.66 °C felt equally cold to touch. The discrimination threshold between pine and oak was 2.01 °C, and those between pine and tile was 3.6 °C. The quantification of temperature perception can provide insight to develop a simulation for estimating the increased/decreased use of heating energy in the living spaces due to the use of certain building construction materials. Findings of the present study support the idea that by using more wood in living spaces it may be possible to achieve a thermally comfortable environment at lower room temperature. en
dc.format.extent 80 + app. 40
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 48/2020
dc.relation.haspart [Publication 1]: Bhatta, S.R., Tiippana, K., Vahtikari, K., Hughes, M., Kyttä, M. Sensory and emotional perception of wooden surfaces through fingertip touch. Front. Psychol. 2017, 8:367. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201812216631. DOI: 10.3389/fpsyg.2017.00367
dc.relation.haspart [Publication 2]: Bhatta, S.R., Vahtikari, K., Hughes, M., Kyttä, M. Investigating the tactile warmth of wood through measuring the cold sensitivity in paired-comparison test. Accepted for the publication to the International Wood Product Journal, March 2020
dc.relation.haspart [Publication 3]: Bhatta, S.R., Tiippana, K., Vahtikari, K., Hughes, M., Kiviluoma, P., Kyttä, M. Quantifying the sensation of temperature: A new method for evaluating the thermal behaviour of materials. Energy & Buildings,195 (2019) 26–32. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201906033373. DOI: 10.1016/j.enbuild.2019.04.047
dc.subject.other Psychology en
dc.title Looking at wood through the skin: A multidisciplinary approach to explore the tactile quality of wood materials en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Insinööritieteiden korkeakoulu fi
dc.contributor.school School of Engineering en
dc.contributor.department Rakennetun ympäristön laitos fi
dc.contributor.department Department of Built Environment en
dc.subject.keyword wood en
dc.subject.keyword wood treatments en
dc.subject.keyword tactile warmth en
dc.subject.keyword psychophysical methods en
dc.subject.keyword tactile perception en
dc.subject.keyword sensory experiences en
dc.identifier.urn URN:ISBN:978-952-60-3808-7
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Kyttä, Marketta, Prof., Aalto University, Department of Built Environment, Finland
dc.opn Jones, Lynette A., Dr., Massachusetts Institute of Technology (MIT), USA
dc.rev Kappers, Astrid, M.L., Prof., Eindhoven University of Technology, Netherlands
dc.rev Jones, Lynette A., Dr., Massachusetts Institute of Technology (MIT), USA
dc.date.defence 2020-04-17
local.aalto.formfolder 2020_03_23_klo_10_56
local.aalto.archive yes

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