Optimization of conceptual manual wheelchair design using integrated QFD and DFMA

Zulkifli, Azni (2016) Optimization of conceptual manual wheelchair design using integrated QFD and DFMA. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This project is to demonstrate the integrated Quality Function Deployment (QFD) and Design Manufacture and Assembly (DFMA) in optimizing the conceptual design of a product. In this project, a manual wheelchair is chosen as the product to show the integration process of QFD and DFMA. The objective of this project is to obtain customer input using QFD and improve the wheelchair design using DFMA based on customer demand and needs. QFD is used to translate the Voice of Customer (VOC) to Voice of Engineer (VOE). On the other hand, DFMA is used to optimize the design and mainly to reduce the cost. From QFD, the parts that need to minimize are identified and DFMA is implemented to convert user desire into the new conceptual design. DFMA software is used to analyze the existing design and new design. The efficiency of re-design and new proposed design are also covered in this project. The part had reduced from 96 parts to 63 parts. As a result, the design efficiency in terms of part number is 34.37% and the cost minimizes to 32%. It showed that the integration method has successfully resolving conflict between customer and technical requirement and reducing part cost.

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