Profiling design preferences using Bezier curve towards Kansei engineering

Loh, Ting Pohg (2017) Profiling design preferences using Bezier curve towards Kansei engineering. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In today’s market, customer no longer purchasing products that only satisfy the functional requirements, but those can meet their affective needs like feeling and emotion. However, designers facing difficulties in estimating, reviewing, and enhancing the customers’ feeling because there is not suitable method to do so. The reusable water bottle was chosen as the object of study in this project. The purpose of this study is to identify and investigate the emotional feeling towards the product design related to customer satisfaction and preferences using Kansei Engineering. Moreover, the profiling design preferences was analysed through mathematical approach using parametric equation based on De Casteljau’s algorithm on Bezier curve. There are three important surveys were conducted which were preliminary survey, main survey and post-test. During preliminary survey, there are 10 designs were chosen by the respondents from 9 categories of water bottle as the most preference design profile. At the same time, 5 Kansei words out of 24 Kansei words were chosen by respondents to represent their emotional feeling towards the water bottle design. After that, the main survey was conducted towards 550 respondents in Melaka, especially in Higher Education Institution. During the main survey, respondents were needed to rate each of the Kansei words that can represent their feelings towards the water bottle design. Next, the Kansei preferences for each water bottle design was determined in which segment based on the Bezier curve obtained. The results showed that the profiling design which showed the ‘Simple’ preferences is at bottom of the water bottle, ‘Modern’ preferences is around the cap area and the right side of the water bottle and ‘Durable’ preferences is design with dual mouth and covered by extra bag design. To validate the data obtain in main survey, post-test was conducted. The post-test results were consistent with the main survey result. This justify the segment represented the Kansei preferences towards the design is valid.

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