bathtub curve


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bathtub curve

[′bath‚təb ‚kərv]
(industrial engineering)
An equipment failure-rate curve with an initial sharply declining failure rate, followed by a prolonged constant-average failure rate, after which the failure rate again increases sharply.

bathtub curve

Common term for the curve (resembling an end-to-end section of one of those claw-footed antique bathtubs) that describes the expected failure rate of electronics with time: initially high, dropping to near 0 for most of the system's lifetime, then rising again as it "tires out". See also burn-in period, infant mortality.
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They follow what is known in engineering and risk assessment circles as the bathtub curve.
Burn-in testing (BIT) is supposed to detect and eliminate such "freaks," so that the final bathtub curve of a product that underwent BIT does not contain the infant mortality portion.
A bathtub curve is the corresponding cumulative distribution function (CDF) evaluated in two parts: one for the lower half of the PDF, integrated from left to right, and one for the upper half, integrated from right to left.
The failure rate is historically modelled (Crowe & Feinberg, 2001; Moubray, 1997; Andrews & Moss, 1993) using the traditional bathtub curve shown in Figure 1.
Wg Cdr Bromehead, in evidence, said: "The bathtub curve is a general engineering principle that is when something gets old, it is more likely to break.
A lot of facilities equipment has failure characteristics that are shaped in a pattern like a bathtub curve (see Figure 1), meaning that it begins with a high incidence of failure (known as infant mortality); is followed by a lower, constant probability of failure; and is then followed by a wear-out zone where failure probability is high again.
With that in mind, the observed failure rate of the test population can be expressed on the Bathtub Curve as the result of the composition of three prominent failure types: early life failure, constant (random) failure and wear-out failure.
The Q-Scale plot provides a visual representation of jitter breakdown, which is a more intuitive presentation of the nature of the jitter components than a traditional bathtub curve.
If we experience a bathtub curve, with a steep decline followed by a sustained period of low economic activity, then supply chain executives will face a challenge most have never faced before: how to manage supply chains in a no-growth or slow-growth economy efficiently and effectively.
Component failure rates have been shown to follow the traditional bathtub curve [ILLUSTRATION FOR FIGURE 5 OMITTED] which depicts component life in three stages.
This speed is applied in a Quick-View display which simultaneously shows the Eye Diagram, Spectrum and NQ-Scale Jitter Decomposition, TIE, jitter histogram and Bathtub curve.
These innovations, as well as the heralded four simultaneous views of eye diagram, time interval error, bathtub curve and jitter histogram, come standard in the new SDA 7 Zi analyzers.