Development of a DfE Methodology injapan -Quality Function Deployment for Environment-
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1 Development of a DfE Methodology injapan -Quality Function Deployment for Environment- Keijiro Masui*, Tomohiko Sakao** and Atsushi Inaba*** *Institute of Mechanical Systems Engineering National Institute of Advanced Industrial Science and Technology (AIST) 1-2, Namiki, Tsukuba, Ibaraki, Japan k-masui@aist.go.jp **Safety Science and Engineering Department Mitsubishi Research Institute, Inc , Otemachi, Chiyoda, Tokyo, Japan sakao@mri.co.jp *** Research Center for Life Cycle Assessment National Institute of Advanced Industrial Science and Technology (AIST) 16-1, Onogawa, Tsukuba, Ibaraki, Japan a-inaba@aist.go.jp Abstract This paper presents a methodology to apply Quality Function Deployment (QFD) for environmentally conscious design in the early stage of product development. This methodology has been developed by incorporating environmental aspects into QFD to handle the environmental and traditional product quality requirements simultaneously. "QFD for Environment (QFDE)" proposed consists of four phases. Designers can find out which parts are the most important parts to enhance environmental consciousness of their products by executing QFDE phase I and phase II. Further, the authors developed a methodology to evaluate the effects of design improvement on environmental quality requirements as phase III and IV. The results obtained from the case studies show that QFDE could be applicable in the early stage of assembled product design. 1. Introduction In recent years, environmental consciousness is rapidly becoming a fundamental product design focus for manufacturers. In 1997, environmentally conscious design (Ecodesign) dissemination project aimed at small and medium-sized companies has been conducted jointly by UNEP and Delft University of Technology in the Netherlands (UNEP, 1997). There are some design tools in evaluating a product s impact to the environment and disassembly time to enhance recyclability of a product (e.g. Rapoza, 1996, Jean, 1999). However, most design tools which need detailed data of a product cannot be used in the early stage of product design. Quality Function Deployment (QFD) which is used to analyze functions required for a product or the product structure to realize these functions is a design tool applicable to the early stage of product development (Akao, 1990). Some researches incorporating environmental aspects into QFD have been achieved. For example, Zhang et al. (1998) developed a method called GQFD-II, which integrates Life Cycle Assessment (LCA) and Life Cycle Costing (LCC) into QFD. When evaluating environmental aspects of a product using GQFD-II, quantitative LCA must be performed. Masui et al. (2000) have focused on developing a decision-making support tool on environmental aspects by using QFD, which is available practically in the early stage of product development.
2 In this paper, a methodology of QFD applied to environmentally conscious design is introduced. As outlined Figure 1, conceptual design, qualitative design review, detail design, and quantitative design review are following to product concept making using QFD as a whole "Design for Environment (DfE)" flow. "QFD for Environment (QFDE)" the authors propose consists of four phases. The outcome of QFDE phase I and II is identification the components that should be focused in product design when environmental as well as traditional items are considered. After identifying the important parts and components, design engineers will try to improve the design of their products at the DfE project organized Product concept making (Utilization of QFDE) Conceptual design Qualitative design review on environmental aspect (Utilization of DfE checklist) Detail design Quantitative design review on environmental aspect (Utilization of LCA) Production Figure 1 DfE flow and design support tools viewpoints of environment. It is helpful for design engineers to evaluate the effect of their design changes on environmental aspects of the product beforehand. The authors also developed QFDE phase III and IV further so that design engineers would examine the possibility of design improvements for each component and find out the improvement effects of their design changes. Six case studies were conducted to verify the applicability of QFDE to DfE in this research. In the final chapter of this paper, the results of verification through the case studies are discussed. 2. Applying QFD to DfE 2.1. Quality Function Deployment (QFD) It is important to listen to customer requirements to obtain market needs and make them reflected on the product design. QFD is a method to collect vaguely expressed quality requirements (Voice of Customer: VOC) from the market and deploy them to actual design work. While QFD needs many phases for deeper hierarchical deployment, the authors use two phases to translate VOC up to parts characteristics. In phase I, VOC for a product are deployed to more detailed Engineering Metrics (EM) to clarify their positions. In phase II, the relationship between the above EM items and components of the product are clarified. Through these steps, the designer can identify which functions and components should be focused in order to satisfy customer requirements. The roles of QFD include the analysis between trade-offs items for design and identification of their product s market competence through benchmarking processes. However, to make it simple, the authors decided to focus on creation of quality tables as they are the basic elements of this tool Voice of customer (VOC) and engineering metrics (EM) on environmental aspects When designers improve their products environmentally, they will listen to the voice of green consumers. There are some researches on green marketing (Stevels, 2000), however, the requirements for the environment from the consumers are not strong so far. On the other hand, in recent years, many companies are extending their responsibility to consider the upstream environmental impacts of manufacturing and the downstream impacts of consumer use and disposal of products. OECD work on Extended Producer Responsibility (EPR) began in 1994, and the trend is towards the
3 extension of EPR to new product groups (OECD, 2001). Here, EPR is a policy approach under which producers accept significant responsibility - financial and/or physical - for the treatment or disposal of post-consumer products. Assigning such responsibility to manufacturers could provide incentives to form partnerships with customers and recyclers to work on making changes that reduce the environmental impact. Eagan et al. (2001) identified two categories of customers who might represent the environment. The first category includes the customers who speak directly for the environment like environmental regulators and green consumers. The second category includes the customers whose behavior and actions support the environment such as recyclers and end-of-life disposal plants. Based on the EPR policy approach as mentioned above, not only consumers (users) but also recyclers, the government, the environment are considered to be customers in this study. The authors investigated what kind of requirements and attributes should be considered from the environmental point of view through a whole product life cycle, and then integrated those environmental items into a set of feasible environmental VOC and EM, and their correlation factors. The environmental VOC and EM are explained below. Environmental VOC less material usage: using smaller amount of materials for the product. easy to transport and retain: easy to transport and retain during the logistics to retailers and reverse logistics from users. easy to process and assemble: easy to process and assemble during manufacturing. less energy consumption: consuming less energy and electricity during all the lifecycle stages. high durability: slow to deteriorate and highly reliable during usage. easy to reuse: easy to reuse as a product or as a part. easy to disassemble: easy to disassemble in the maintenance stage during usage and in the end-of-life stage. easy to clean: easy to clean the exterior. easy to smash: easy to smash in the end-of-life stage easy to sort: sorting products or parts easily from the viewpoint of material. safe to incinerate: releasing no toxicities during incineration in the end-of-life stage. safe to landfill: releasing no toxicities out of the sites after landfilling the parts or the remainings of incineration. harmless to living environment: harmless to the living environment of the users and the inhabitants of their neighborhood during the manufacturing and usage. For example, toxic substances, noises, vibrations, electromagnetic waves, or smells are not released. safe emission: safe emission from the manufacturing plants. possible to dispose at ease: requesting no consideration of resource depletion or toxicity when users throw away. Environmental EM weight: the weight of the product. volume: the volume of the product. number of parts: the number of parts in the product. number of types of materials: the number of types of materials in the product. likelihood to get dirt: the speed of change of the exterior color by the effect of dirt. hardness: the hardness of the parts in the product. physical lifetime: the physical lifetime of the product.
4 amount of energy consumption: the amount of energy consumption along with all the life-cycle stages. rate of recycled material: the rate of recycled materials in the product. noise, vibration, electromagnetic wave: the volumes of the noise, vibration, electromagnetic wave given out during the use of the product. mass of air pollutant: the mass of emission of air pollution substances along with all the life-cycle stages. mass of water pollutant: the mass of emission of water pollution substances along with all the life-cycle stages. mass of soil pollutant: the mass of emission of soil pollution substances along with all the life-cycle stages. biodegradability: biodegradability of the materials of the parts to be landfilled. toxicity of materials: toxicity of the materials of the product. 3. Identifying the target of design improvement 3.1. QFDE Phase I Tables 1 and 2 show examples where QFDE is applied to the design of a hair drier (Ishii, 1997). Table 1 shows the deployment of VOC to Engineering Metrics (EM) (Phase I). VOC items in the table include the environmental VOC items such as less material usage as well as requirement items from customers such as dries quickly and quiet. Usually VOC items are weighed based on market survey to show the Customer Weights. 9 shows that it is very important, 3 shows it is important, and Table 1 QFDE Phase I of a hair drier QFD for Environment Phase I customer weights Engineering Metrics air flow air temperature balance(torque) weight volume numbers of parts numbers of types of materials likelihood to get dirt hardness physical lifetime amount of energy consumption rate of recycled materials noise, vib., electromagnetic wave mass of air pollutant mass of water pollutant mass of soil pollutant biodegradability toxicity of materials Voice of Customer dries quickly quiet operates safely operates easily comfortable to hold reliable portable less material usage easy to transport and retain easy to process and assemble less energy consumption high durability easy to reuse easy to disassemble easy to clean easy to smash easy to sort safe to incinerate safe to landfill harmless to living environment safe emissions possible to dispose at ease raw score relative weight
5 1 shows it is relatively important. The degree of importance of environmental VOC is dependent on the concept of developed product or the context of product life cycle. Further, they might be decided based on the result of LCA, which is the quantitative evaluation method, applied to a similar product. On the other hand, EM items include new items such as amount of energy consumption as well as traditional items such as air flow. At crossing points between VOC items and EM items are shown numbers indicating magnitude of both factors called Relational Strength determined by the designer. Similar to the weighing of VOC items, 9 shows the relation is strong, 3 shows it is relatively strong and 1 shows a certain strength. Here, at the crossing points between the environmental VOC items and environmental EM items the values of relational strength prepared by the authors are provided for designer to help their decisions. The total of the sum multiplied by Customer Weights and Relational Strength is the Raw Score for each EM item. Furthermore, Relative Weight for each item is obtained by the Raw Score / Sum of the Raw Score. This example shows that air flow, air temperature and amount of energy consumption are relatively important as EM items to satisfy customer requirements such as less energy consumption, high durability, and harmless to living environment as well as traditionally required quality items such as dries quickly and comfortable to hold QFDE Phase II In the second stage (Phase II) Deployment of EM items to Components of Product, relative importance for each component of the product is obtained in the same way as Phase I. As shown in Table 2, it is found that motor is most important and then Table 2 QFDE Phase II of a hair drier QFD for Environment Phase II Component Characteristics Engineering Metrics air flow air temperature balance(torque) weight volume numbers of parts numbers of types of materials likelihood to get dirt hardness physical lifetime amount of energy consumption rate of recycled materials noise, vib., electromagnetic wave mass of air pollutant mass of water pollutant mass of soil pollutant biodegradability toxicity of materials housing is important. To environmentally improve existing systems, compare the results obtained here with the QFD results without the environmental VOC and environmental EM items. 4. Evaluation method of design improvement When design engineers improve their product from a viewpoint of the environment, evaluating effects of candidates of design changes on environmental aspects is an effective process after identifying the important components. In this section, a method to evaluate the effects of design changes for parts or components on environmental aspects (Phase III and Phase IV) is introduced QFDE Phase III In the phase III, the effect of a set of design changes on engineering metrics (EM) items are estimated. In general, design engineers can make several alternative Phase I relative weights raw score relative weight motor fan asm heater elements switch / wiring harness housing
6 plans. There are two approaches when design engineers will decide where they should first focus on. One approach is originated from a target VOC. If they have already had a target of less energy consumption VOC for example, they should seek the parts which can be suppressed in terms of amount of energy consumption. The other one is examining the most important components identified in phase II. Table 3 shows an example of phase III for a hair drier. Here, we gave priority to the environmental aspects, and the design improvement plan was mainly set from the viewpoint of amount of energy consumption. If it is assumed that the energy consumption of a motor and a heater are reduced and then the noises of a motor are suppressed, Table 3 QFDE Phase III of a hair drier QFD for Environment Phase III Component Characteristics motor fan asm heater elements switch / wiring harness housing score the numbers indicating the relational strength in phase II (Table 2), at crossing points between the target engineering metrics and parts are remained as shown in Table 3. The improvement rate to each EM item mrj is obtained from the equation. improvement rate of engineering metrics Engineering Metrics air flow 0 air temperature 0 balance(torque) 0 weight 0 volume 0 numbers of parts 0 numbers of types of materials 0 likelihood to get dirt 0 hardness 0 physical lifetime 0 amount of energy consumption rate of recycled materials 0 noise, vib., electromagnetic wave mass of air pollutant 0 mass of water pollutant 0 mass of soil pollutant 0 biodegradability 0 toxicity of materials 0 mr j K b j, k k = 1 = K k = 1 b c j, k j, k (j =1,,J) (1) where K is the index number of a component and J is the index number of an EM item. bj,k is the relational strength between EM item j and component k in phase II. Cj,k is the improvement rate of EM item j to component k and originally allowed to take the real number from 0.0 to 1.0. In this paper, to make it simple, Cj,k can take the binary digits QFDE Phase IV The mission of the phase IV is to translate the effect of design changes on EM into environmental quality requirements (environmental VOCs). Table 4 shows an example of phase IV for a hair drier. In this table, the numbers of customer weight and relational strength between VOC items and EM items are same as shown in phase I (Table 1). The improvement rate for EM items obtained in the phase III are at the bottom of the table. The improvement rate for each environmental VOC vri is obtained from the following equations. vr i J j= 1 = J mr a j= 1 a j i, j i, j (i =1,,I) (2)
7 where J is the index number of an EM item and I is the index number of a VOC item. ai,j is the relational strength between VOC item i and EM item j in phase I. The improvement effect for the environmental VOC considering customer weight is obtained by multiplying vri and customer weight i together. The authors consider that this evaluation method for design improvements can help design engineers select the most effective design changes plan. QFD for Environment Phase IV Table 4 QFDE Phase IV of a hair drier customer weights Engineering Metrics air flow air temperature balance(torque) weight volume numbers of parts numbers of types of materials likelihood to get dirt hardness physical lifetime amount of energy consumption rate of recycled materials noise, vib., electromagnetic wave mass of air pollutant mass of water pollutant mass of soil pollutant biodegradability toxicity of materials Voice of Customer dries quickly quiet operates safely operates easily comfortable to hold reliable portable less material usage easy to transport and retain easy to process and assemble less energy consumption high durability easy to reuse easy to disassemble easy to clean easy to smash easy to sort safe to incinerate safe to landfill harmless to living environment safe emissions possible to dispose at ease improvement rate of customer requirement improvement effects of customer requirement improvement rate of engineering metrics amount Responses from case study teams and discussions The purposes of the case studies are a) to verify the applicability of QFDE, b) to reveal the problems in carrying out QFDE, and c) to find possible problems in spreading QFDE to corporations. Six medium-sized manufacturers participated in the case studies. QFDE was executed by a study team in each company, which consists of employees mainly from a technology division and from an environment division. The number of the team members was from five to seven. In more details, they selected their own products such as IC package and CRT, carried out QFDE, interpreted the results, and answered some questionnaires provided by the developers of QFDE. The authors obtained the responses from the teams of the six case studies as follows. Overall evaluation of QFDE: Many positive opinions and no negative opinion were obtained. The following evaluations by the study teams also show that the effectiveness of QFDE was recognized. QFDE can contribute to manage various items systematically and effectively. QFDE can make a design team avoid subjective discussions. An environmental profile of a product produced by Phase I and Phase II of QFDE was found to be similar to results from other tools such as LCA.
8 Possibility of QFDE as a standard tool: The following opinions were obtained to the question on whether QFDE can be introduced as a standard tool in an early stage of design inside a company. It is possible, since QFD is actually employed in some areas in the company. It is possible, and default matrices for each type of products would make the employment of QFDE easier. Difficulties with using QFDE: A pointed-out difficulty with using QFDE was in giving discrete numbers to two matrices. A kind of guideline on how to score was also expected. 6. Conclusions The authors developed QFD for Environment (QFDE) by incorporating environmental aspects (Environmental VOC and Environmental EM) into QFD to handle the environmental and traditional product quality requirements together intended to be used in the early stages of product design. Design engineers can identify the components that should be focused in their product by carrying out phase I and II, and then analyze which design changes among the various candidates are most effective on environmental improvement though Phase III and Phase IV. From the case studies, it was proved that QFDE is applicable to an early stage of assembled product design. At the same time, some critical points for a successful use of QFDE were revealed. The most important is recovering a difficulty to give discrete numbers to two matrices in QFDE. Acknowledgments Funding for this research comes from Japan Environmental Management Association for Industry. The authors would like to thank researchers in Industrial Research Institute of Nagano Prefecture. References [1] UNEP (1997), ECODESIGN: A Promising Approach to Sustainable Production and Consumption, United Nations Publication. [2] Rapoza, B., Harjula, T., Knight, W.A. and Boothroyd, G. (1996), "Product Design for Disassembly and Environment", Annals of CIRP, pp [3] Jean, P., Coulon, R., and Timmons, D. (1999), "Building an EcoDesign Toolkit for the Electronics Industry", EcoDesign '99, pp [4] Akao, Y. (1990), QUALITY FUNCTION DEPLOYMENT, Productivity Press, Cambridge, Massachusetts. [5] Zhang, Y., Wang, H.P. and Zhang, C. (1998), "Product Concept Evaluation Using GQFD-II and AHP", Int. Jour. of Environmentally Conscious Design & Manufacturing, Vol. 7, No. 3, pp [6] Masui, K., Sakao, T., Aizawa, S., Inaba, A. (2000), "Design for Environment in Early Stage of Product Development Using Quality Function Deployment", Joint Int. Congress and Exhibition Electronics Goes Green 2000+, pp [7] Stevels, A. (2000), "Green Marketing of Consumer Electronics", Joint Inter. Congress and Exhibition Electronics Goes Green 2000+, pp [8] OECD (2001), Extended Producer Responsibility: A Guidance Manual for Governments. [9] Eagan, P. and Finster, M. (2001), "Creating Business Value by Linking Industrial Ecology with Business Strategy and Product Design", EcoDesing2001, pp [10] Ishii, K. (1997), Design for Manufacturability: Product Definition, Course Reader for ME217, Stanford University, California.
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