EGR 100 Chapter Notes - Chapter 14: Maintainability, Change Impact Analysis, Life-Cycle Assessment
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Chapter 14 design for production, use, and sustainability. Consider the two failure distributions shown in figure 14. 1. These two reliability probability distributions have the same mean (or average), that is, mtbf a=mtbf b. , but they have very different degrees of dispersion about that mean. If we are not concerned with both mean and variance, we may wind up choosing a design alternative that is seemingly better in terms of mtbf, but much worse in terms of variance. Ri(t: we see that the overall reliability of a series system is equal to the product of all of the individual reliabilities of the elements or parts within the system. In a parallel system each of the components must fail in order for the system to fail. The reliability rp (t) of this entire parallel system is given by. We must consider the following categories: air quality, water quality and water consumption, energy consumption, waste generation.