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Identifying trigger feeling factors
KTH, School of Technology and Health (STH), Ergonomics.
KTH, School of Technology and Health (STH), Ergonomics.ORCID iD: 0000-0001-5338-0586
2010 (English)In: International Conference on Kansei Engineeringand Emotional Research (KEER), Paris, France, 2010Conference paper (Refereed)
Abstract [en]

Trigger mechanism design in power hand tools is of great importance for communicating with the operator and for providing feedback on operational functioning. Therefore, for a successful power hand tool design, knowledge about how the trigger mechanism feels is required.

This study aims to define and investigate the design factors related with trigger tactile feeling for electrical right angled nutrunners. A Kansei Engineering (Affective Engineering) study has been conducted for a comparison between users´ (operators that work at an automotive assembly plant) and product developers´ (product development group of a power hand tool manufacturer) to find common and differing semantic expression dimensions for that. 124 Kansei words (descriptors) were collected from literature, interviews and workshops. These words were reduced to 52 by affinity analysis and evaluated by operators and product developers using semantic differential technique.

From the operator group`s responses six factors (explain 87% of variation ) were extracted as, “professional performance”, “safety and tactile feeling”, “usability”, “smooth operation”, ”communication and durability”, “convenient and comfortable” to define trigger feeling. Correspondingly, five factors (explain 89% of variation) “robust and appealing”, “ergonomics and operator performance”, “controllability and predictability”, “creativity and modern” and“powerful” were distinguished for the product development group. Results showed that the start phase and especially quick start of trigger mechanism is more important to operators, while end feedback is more important to product developers. Soft start of the trigger is correlated with ergonomics, optimal, clear operation and performance for product developers while soft start together with end feedback are associated with well-built, convenient and safe trigger characteristics for operators. According to the results from average ratings the Kansei word “ergonomic” has been rated as the most important descriptor for trigger feeling together with “user-friendly”, “easy to use”, “long life time” and “comfortable” for both groups. By developing a questionnaire using the factors and variables identified; this questionnaire can be used to assess views of operators about trigger functioning and to know how do operators feel about new types of trigger mechanisms.

Place, publisher, year, edition, pages
Keyword [en]
Product development, semantic meaning, switch design, powered hand tools
National Category
Production Engineering, Human Work Science and Ergonomics
URN: urn:nbn:se:kth:diva-43449OAI: diva2:448465
QC 20111017Available from: 2011-10-17 Created: 2011-10-17 Last updated: 2011-10-17Bibliographically approved
In thesis
1. Engineering Quality Feelings: Applications in products, service environments and work systems
Open this publication in new window or tab >>Engineering Quality Feelings: Applications in products, service environments and work systems
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Contemporary quality issues in product design are moving from materialistic to emotional user fulfillment; comprehensive research is needed to examine quality product feelings. This research is directed toward a deeper understanding of user and customer quality feelings for different product types, including services.

The quality feelings concept includes dimensions of product quality, especially functionality, ergonomics and aesthetics. The first objective of this thesis is to identify, prioritize and synthesize quality feelings into product attributes in product development applications. The second objective is to explore, test and propose methodological approaches for designing quality feelings into products.

Several methods from psychology, ergonomics, statistics and probabilistic methods and heuristics were applied to achieve the objectives. From a methodological viewpoint, Likert scales, free elicitation technique and Just About Right scales were applied for data collection. Multiple Regression, Factor Analysis, Correspondence Analysis, Genetic algorithms, Partial Least Squares (PLS) and Rough Sets (RS) were applied for data analyses. For ergonomic product evaluations, direct observations, 3D workload simulations, time and frequency analyses were conducted.

Five product applications are included in this thesis: operator driver cabin design of reach trucks, steering wheel design trigger switch design in right-angled nutrunners, bed-making systemsproducts and waiting room environments.

Heuristic methods were found effective when there is a high number of product attributes that interact to provide quality feelings. RS results are consistent with PLS attribute predictions. When the number of product attributes is large in comparison to the number of observations, PLS extracts informative results for quality feelings. The RS method is effective in identifying interactions among design attributes.

Quality feelings are associated with both tangible (tactile characteristics) and intangible (quick and easy to use) product characteristics. Words such as safety, functionality, ergonomics, comfort, reliability, supportiveness, usability, feedback, pleasantness, attractiveness, durability and distinctiveness describe quality feelings from tangible products and services. Based on product type, the quality dimensions represented by these words possess different interactions and dependencies. In work environments, products act as prostheses between workers for social interaction, which need to be considered as important quality feelings dimensions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xiv, 155 p.
Trita-STH : report, ISSN 1653-3836 ; 11:5
ew product development, ergonomics evaluation design for quality, Affective Engineering, servicescape design, product experience
National Category
Production Engineering, Human Work Science and Ergonomics
urn:nbn:se:kth:diva-43388 (URN)
Public defence
2011-10-31, 3-221, Alfred Nobel`s Alle 10, Huddinge, 13:19 (English)
QC 20111017Available from: 2011-10-17 Created: 2011-10-14 Last updated: 2011-10-28Bibliographically approved

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