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Article #619862Re: 1956 -- circuit reliability book
From: jmfbahciv
Date: Thu, 25 Jan 2018 15:05
Date: Thu, 25 Jan 2018 15:05
35 lines
3604 bytes
3604 bytes
AndyW wrote: > On 24/01/2018 18:04, Charlie Gibbs wrote: > >> This might be due to the consumer mindset, which eschews maintenance. >> Buy a gadget, run it like hell until it breaks, throw it out. Lather, >> rinse, repeat. Under such conditions I can see a bathtub curve as a >> combination of infant mortality and wear out - both of which would be >> eliminated by conscientious installation and maintenance. > > The modern mindset is to accept that the failure will occur despite > preventive maintenance and instead work on making the failure > convenient. You can prevent failure by throwing money at the problem > (which is a diminishing returns situation) or you can detect an > impending failure and just schedule a replacement at the next docking > period, production line shutdown, holiday period etc. > > Most items, say a bearing, will degrade over time in a regular and > predictable way* from tiny pitting in the bearing face,noise and > deflection from the bearings hitting the 'potholes' that result in heat > and vibration, through the complete collapse of the bearing. At various > stages of the collapse the impending failure is detectable through > various means such as vibration monitoring, temperature monitoring, > acoustic monitoring etc. If you can detect it early enough then you can > say with reasonable confidence how long it will be until failure. > > *note that an individual bearing will show a wear-out curve but the > point at which the wear out starts is random hence the graphs for > populations of bearings show a constant failure rate flat graph. > > sorry rambling on... 30 years at this and I get a bit geeky. Please continue to be geeky. This is interesting to those of us who haven't done the work. /BAH
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X-Received: by 10.55.26.12 with SMTP id a12mr6703224qka.55.1516892815773; Thu, 25 Jan 2018 07:06:55 -0800 (PST) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 10.55.217.7 with SMTP id u7ls3715832qki.11.gmail; Thu, 25 Jan 2018 07:06:54 -0800 (PST) X-Received: by 10.200.53.29 with SMTP id y29mr7831561qtb.56.1516892814680; Thu, 25 Jan 2018 07:06:54 -0800 (PST) Path: mbox-mo1.pugleaf.net!e39ni3352qtk.1!nntp.google.com!peer02.iad!feed-me.highwinds-media.com!news.highwinds-media.com!spln!extra.newsguy.com!newsp.newsguy.com!news1 From: jmfbahciv <See....@aol.com> Newsgroups: alt.folklore.computers Subject: Re: 1956 -- circuit reliability book Date: 25 Jan 2018 15:05:56 GMT Organization: "Have EDDT, will travel" Lines: 35 Message-ID: <PM0005639B37E3C86F@aca415ad.ipt.aol.com> References: <2884a417-2702-428f-89fb-d21cda9eeaed@googlegroups.com> <udC9C.1255934$OX.701066@fx47.am4> <p489980jjf@news4.newsguy.com> <ncX9C.1315538$OX.1044998@fx47.am4> <p4ahqj11kbc@news4.newsguy.com> <2884a417-2702-428f-89fb-d21cda9eeaed@googlegroups.com> <udC9C.1255934$OX.701066@fx47.am4> <p489980jjf@news4.newsguy.com> <ncX9C.1315538$OX.1044998@fx47.am4> <p4ahqj11kbc@news4.newsguy.com> <2884a417-2702-428f-89fb-d21cda9eeaed@googlegroups.com> <udC9C.1255934$OX.701066@fx47.am4> <p489980jjf@news4.newsguy.com> <ncX9C.1315538$OX.1044998@fx47.am4> <p4ahqj11kbc@news4.newsguy.com> <mJfaC.477462$5Z7.373847@fx29.am4> NNTP-Posting-Host: p866142c7ffa9ae53d89543648dc6e44980701d589dfe4f08.newsdawg.com Mime-Version: 1.0 User-Agent: Pineapple News/0.9.0 (Mac OS X 10.4.9 PowerPC) X-Registered-To: [Registered Name] X-Program-URL: http://www.platinumball.net/pineapple/news/macosx/ X-Received-Bytes: 3133 X-Received-Body-CRC: 1044929038 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit