4097977993

4097977993 - Product Life Cycle Product Performance ME4214...

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1 ME4214 Design for Product Safety Product Reliability Management Dr. David Yuen Department of Mechanical Engineering The Hong Kong Polytechnic University 2 Product Life Cycle – Product Performance • Product performance is influenced by the following two sets of factors: (i) Factors prior to the sale of the product (ii) Factors during product use • The manufacturer has reasonable control over (i) and no (or limited) control over (ii). 3 Product Performance • For most products the characterization of product performance requires a multidimensional vector. Several components of this vector are related to product reliability. These include various notions of reliability, dependability, availability and so on. 4 Reliability is linked to “Quality” • “Quality” paradigm has become very important over the last two decades. • Quality has many meanings. • Two important dimensions of product quality are as follows: (i) Quality of performance (ii) Quality of conformance
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5 Quality of Performance • Quality of performance can be defined in terms of several reliability related performance measures. For example: – Reliability (R(T)) – Mean time to failure (MTTF) – Mean time between failures (MTBF) • Other reliability measures include availability, maintainability. 6 Quality of Conformance • Due to manufacturing variability, not all items produced meet the design specification. Such items are called “non- conforming” items and their performance is inferior to those which conform to the design specification. • Quality of conformance deals with this issue. 7 Reliability management must be included in every Quality Improvement Program 8 Reliability Related Issues TWO PERSPECTIVES – Buyer (Individual, Business, Government) – Manufacturer • Depends on the type of products – Consumer durables – Commercial & Industrial Products
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Types of Products • Consumer durables bought by individuals • Commercial and industrial products bought by businesses • Specialized products e.g., defense products bought by governments 10 Product Life Cycle - Buyer’s Perspective • The product life cycle is the time from the purchase of an item to its discarding due to the item reaching the end of its useful life or its becoming obsolete due to technological changes. • The total time depends on the product and can vary from a few months to several years 11 Product Life Cycle - Buyer’s Perspective (cont’d) • The life cycle involves the following three phases: (i) acquisition, (ii) operation and maintenance, and (iii) discard and replace. 12 Product Life Cycle - Manufacturer’s Perspective From the manufacturer’s perspective, the product life cycle is the time from initial concept of the product to withdrawal of the product from the marketplace. It can be broken into two stages
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4097977993 - Product Life Cycle Product Performance ME4214...

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