Re: Failure Modes and Ranges of Operation
From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Sat, 03 Feb 2007 16:36:03 GMT
Message-ID: <TR2xh.1910$R71.27567_at_ursa-nb00s0.nbnet.nb.ca>
>> Neo's recent troll started me down a meandering path leading to these
>> two separate but somewhat related (engineering) concerns.
>>
>> An operating range describes the conditions under which one of our
>> devices will operate without failure. Failure modes are what happens
>> when one tries to operate a device beyond that range.
>>
>> The sci.logic sort of folks grapple with the problems one encounters
>> when one tries to have an infinite range of operation. And yet one can
>> never fully escape the failure mode problem because division by zero
>> generally fails.
>>
>> Failure mode analysis is very important in engineering. I wonder
>> whether it has any supporting theory? Certainly, one can think of
>> general principles. Likewise, beyond statistical analysis and
>> empirical measurement, does any theory exist regarding ranges of
>> operation?
>>
>> Any thoughts?
Date: Sat, 03 Feb 2007 16:36:03 GMT
Message-ID: <TR2xh.1910$R71.27567_at_ursa-nb00s0.nbnet.nb.ca>
paul c wrote:
> Bob Badour wrote: >
>> Neo's recent troll started me down a meandering path leading to these
>> two separate but somewhat related (engineering) concerns.
>>
>> An operating range describes the conditions under which one of our
>> devices will operate without failure. Failure modes are what happens
>> when one tries to operate a device beyond that range.
>>
>> The sci.logic sort of folks grapple with the problems one encounters
>> when one tries to have an infinite range of operation. And yet one can
>> never fully escape the failure mode problem because division by zero
>> generally fails.
>>
>> Failure mode analysis is very important in engineering. I wonder
>> whether it has any supporting theory? Certainly, one can think of
>> general principles. Likewise, beyond statistical analysis and
>> empirical measurement, does any theory exist regarding ranges of
>> operation?
>>
>> Any thoughts?
> > Sorry, no theory here, just wondering if this question is the same as > asking whether relational closure is impossible when domains that aren't > closed under operators such division, are present?
I assume you are suggesting that failures in extend expressions and restrict expressions cause extend and restrict to fail. Is that correct? Received on Sat Feb 03 2007 - 17:36:03 CET