Product Development and Reliability Concepts
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Questions and Answers

What is the methodology used to translate customer requirements into measurable technical specifications?

  • Design Failure Mode and Effects Analysis (DFMEA)
  • Reliability Function
  • Design Verification
  • Quality Function Deployment (QFD) (correct)

    • The Failure Rate Curve shows failure rates increasing over time.

    False

    What is the term for the structured approach that identifies and addresses potential failures in design?

    Design Failure Mode and Effects Analysis (DFMEA)

    The permissible variation in product dimensions during manufacturing is known as __________.

    <p>tolerance</p> Signup and view all the answers

    Which term describes the ability of a product to perform its intended function for a specified period?

    <p>Reliability</p> Signup and view all the answers

    Match the types of failures with their descriptions:

    <p>Functional Failure = Failure occurring at the start of a product's life due to defects Reliability Failure = Failure occurring after the product has been used for a time</p> Signup and view all the answers

    Achieved Reliability differs from Inherent Reliability in that it is the reliability after production.

    <p>True</p> Signup and view all the answers

    The statistical function used to determine the probability of failure within a specific time range is called the __________.

    <p>Reliability Function</p> Signup and view all the answers

    What is the primary goal of the concept development process in product design?

    <p>To determine product functionality based on customer requirements, technological capabilities, and economic realities.</p> Signup and view all the answers

    How does the House of Quality assist in the design process?

    <p>It helps translate customer requirements into technical requirements and prioritizes them for deployment.</p> Signup and view all the answers

    What distinguishes inherent reliability from achieved reliability?

    <p>Inherent reliability refers to the reliability of a design before production, while achieved reliability is the performance measured after production.</p> Signup and view all the answers

    What does the Process Capability Index (Cp) measure?

    <p>It measures the ratio of specification width to the natural tolerance of a process.</p> Signup and view all the answers

    What role does Design Failure Mode and Effects Analysis (DFMEA) play in product development?

    <p>It systematically identifies and estimates potential failures in the design to mitigate risks.</p> Signup and view all the answers

    What is a functional failure in the context of product reliability?

    <p>It is a type of failure that occurs at the beginning of a product's life due to manufacturing or material defects.</p> Signup and view all the answers

    Explain the purpose of reliability testing in the design verification phase.

    <p>Reliability testing ensures that designs meet customer requirements and production specifications for long-term performance.</p> Signup and view all the answers

    What are systematic errors in measurement systems, and why are they significant?

    <p>Systematic errors, or biases, consistently skew measurement results and can lead to incorrect conclusions.</p> Signup and view all the answers

    Study Notes

    Product Development and Reliability

    • Concept Development: Determining product functionality based on customer needs, technology, and economics.

    • Quality Function Deployment (QFD): Translating customer requirements into measurable technical specifications.

    • Design Failure Mode and Effects Analysis (DFMEA): Systematically identifying and addressing potential design failures.

    • Tolerance: Permissible variation in product dimensions during manufacturing.

    • Reliability: A product's ability to perform its intended function over time.

    • Process Capability Index (Cp): Ratio of specification width to process natural variation.

    • Failure Rate Curve: Graphical representation of failure rate, initially high, decreasing, then increasing.

    • Functional Failure: Failures occurring at the start of a product's life, often due to manufacturing defects.

    • Reliability Function: Statistical function calculating the probability of product failure within a time frame.

    • Design Verification: Systematically confirming designs meet customer needs and production specifications.

    Design for Six Sigma (DFSS) Activities

    • Concept Development: Establishing product principles based on customer needs and capabilities.

    • Design Development: Refining product design, including tolerance design, DFMEA, and reliability prediction.

    • Design Optimization: Enhancing product efficiency through Taguchi loss function and optimization of reliability.

    • Design Verification: Validating the design through reliability testing, measurement system evaluation, and process capability evaluation.

    House of Quality (HoQ)

    • Steps in Building the HoQ:
      • Identify customer needs and technical requirements.
      • Relate customer needs to technical requirements.
      • Evaluate competing products.
      • Set targets for technical requirements.
      • Determine deployment of technical requirements.

    Types of Failure

    • Functional Failures: Failures at the start of a product's life due to defects.

    • Reliability Failures: Failures occurring later due to degradation and wear.

    Types of Reliability

    • Inherent Reliability: Reliability due to the fundamental qualities of the product.

    • Achieved Reliability: Realistically achievable reliability after considering manufacturing and operational issues.

    Reliability Measurement

    • Failure Rate: Rate of failures per unit of time.

    • Mean Time to Failure (MTTF): Average time before a failure occurs.

    • Mean Time Between Failures (MTBF): Average time between failures.

    Measurement System Errors

    • Systematic Error (Bias): Consistent deviations from true values.

    • Random Error: Erratic deviations due to chance.

    Process Capability Studies

    • Peak Performance Study: Understanding the best process performance.

    • Process Characterization Study: Analyzing process variability.

    • Component Variability Study: Assessing variability in individual components.

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    Description

    Test your knowledge on key concepts in Product Development and Reliability, including Quality Function Deployment and Design Failure Mode and Effects Analysis. This quiz covers essential elements such as tolerance, reliability, and failure rate curves that are crucial for developing successful products.

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