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Systematic study of touch-feel perception : surface affective engineering aspects
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Yue, Zhaoyang (2010) Systematic study of touch-feel perception : surface affective engineering aspects. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2487922~S15
Abstract
The objective of this Ph.D work is to establish an affective engineering system for
general surface tactile evaluation, which fits in the current knowledge gap between
the micro-surface physical properties and the customers’ peceptual responses to
surface tactile senses as well as their affective preferences.
Drawing upon a broad multidisciplinary review, this research identifies the value of
such affective system for tactile evaluation in both academic research and industry
application. A concept framework of surface tactile evaluation system is specified,
including three substructs: instrumentation, sensory evaluation and database
construction & mining. The framework is implemented to investigate how surface
tribological factors such as topography, hardness and friction against skin affect the
tactile attributes and general preference, with regard to 'soft-touch' polymer coatings
and patterns. Works were done in three major folds:
Firstly, two instrumentation features for tribological test and surface characterisation
have been developed. The works include (1) a novel tribometer with flexible
configurations of in-vivo friction test by finger touch and dry sliding Roller-on-Block
test and (2) a Hot-tip Tribological Probe Microscope (hot-tip TPM) with localized
surface thermal measurement. Their novelty in design and performance are presented
and discussed in detail. Some preliminary tactile studies on car interior materials and
regular machined surfaces are also performed on tribolgical aspects. To help
interpreting the data acquired from TPM and to improve the understanding of the
limitation of surface characterization at micro/nano scale, fidelity issues are
considered on two aspects: (a) finite tip size effect on topography measurement and
(b) probe misalignment effect on nanoindentation test.
Secondly, a database of ‘soft-touch’ polymer surfaces has been constructed at both
physical level and psychophysical level. On one hand, the surface microstrutures are
physically characterized by the home-made instruments and other commercial ones,
in terms of topography, surface nanohardness and friction coefficient. Internal
correlations among the measured surface properties are observed. Attempts have
been made to explain these correlations by the aforementioned fidelity issues and
classical tribology theory. On the other hand, the tactile perception towards the
polymer samples are evaluated and quantified in the four major tactile sensory modes
(Smooth-rough , soft-hard , slippery-grippy , cool-warm) and the general preference
(Like-dislike). Nonparametric statistical tests such as Kendall’s W test and Wilcoxon
test are applied to study the evaluation effectiveness among the subjects and the
perceptual difference among the samples. Gender difference is identified in the
tactile evaluation effectiveness of polymer coatings.
Last but not least, this research further explored the complex relationships among the
perceived attributes and measured surface properties by using a range of classical
data mining techniques such as cross correlation analysis, factor analysis and
regression methods. It was noted that the perceived attributes such as smooth/rough
and grippy/slippy are influenced by surface topography with parameters of roughness
and average spacing while the perceived softness largely depends on the ratio of
hardness to modulus H/E. A regression model is established to describe the
psychophysical relationships in relation to surface tactile design of the ‘soft-touch’
polymers.
Item Type: | Thesis (PhD) | ||||
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Subjects: | B Philosophy. Psychology. Religion > BF Psychology T Technology > TA Engineering (General). Civil engineering (General) |
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Library of Congress Subject Headings (LCSH): | Surfaces -- Evaluation, Surfaces -- Microstructure, Touch, Tactile sensors | ||||
Official Date: | August 2010 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Liu, Xianping, 1957- | ||||
Sponsors: | University of Warwick | ||||
Extent: | ix, 242 leaves : ill., charts | ||||
Language: | eng |
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