just a quick question if anyone knows what the word 'TFA' stood for in pit terminology, i think it may be on the electricians side i dont know, any help much appreciated, thankx
just a quick question if anyone knows what the word 'TFA' stood for in pit terminology, i think it may be on the electricians side i dont know, any help much appreciated, thankx
stan (mickyf)
Been scratching my head for a long while over that one Stan, doesn't ring any bells for me.
just a quick question if anyone knows what the word 'TFA' stood for in pit terminology, i think it may be on the electricians side i dont know, any help much appreciated, thankx
stan (mickyf)
T hanks F or A sking or maybe; T ransient F ault A nalysis possibly a sort of ongoing, onboard electronic diagnostic system, such as Anderson used within their machines from the AM500 onwards, ....................... burr it's onli a gess, coss am onli a thick pit fitter en iveribodi nos yer carnt get thicka than a Thick Pit Fitta, eh John?
just a quick question if anyone knows what the word 'TFA' stood for in pit terminology, i think it may be on the electricians side i dont know, any help much appreciated, thankx
stan (mickyf)
T hanks F or A sking or maybe; T ransient F ault A nalysis possibly a sort of ongoing, onboard electronic diagnostic system, such as Anderson used within their machines from the AM500 onwards, ....................... burr it's onli a gess, coss am onli a thick pit fitter en iveribodi nos yer carnt get thicka than a Thick Pit Fitta, eh John?
T hanks F or A sking or maybe; T ransient F ault A nalysis possibly a sort of ongoing, onboard electronic diagnostic system, such as Anderson used within their machines from the AM500 onwards, ....................... burr it's onli a gess, coss am onli a thick pit fitter en iveribodi nos yer carnt get thicka than a Thick Pit Fitta, eh John?
You made that up didn't you!
Abstract ”The problem of system recovery from transient faults is addressed using retry techniques. A probabilistic model for the activity of faulty periods, and a fault analysis to derive the optimum retry period are presented. Distribution functions are derived to represent the case of false alarm, where a transient fault is flagged as permanent, and the case of a miss because too many faults coexist, overcoming the checker's capability to detect them. These derivations are compared with the results of a simulation program representing the model. Other factors influencing the value of the retry period are discussed”
Transient-fault analysis for retry techniques Saleh, A.M. Patel, J.H. Bell Commun. Res., Red Bank, NJ;
Sadly there does appear to be areas and frequencies of serious omissions within your personal edification John, I can only make the presumption, albeit rebuttable, that these voids were created within a seminal portion of your life, possibly occurring betwixt your periods of enforced incarceration betwixt Nothinghamshire and your subsequent “transfer” to the Land of Downside Uppermost and brief sojourn on Happy Apple Island. I am in fact not only surprised but disappointed to find that you have not even an apparent awareness of the above published research paper, however, as always, I am happy, albeit in ignorant humbleness to assist in identifying and pointing out the areas of such beneficial scriptures wherever possible, I trust this post may help in some way. Ps. Most of my career was spent as a Development Engineer, whose main role in life is to either “develop” things, or, failing that, “make up” plausable excuses!
Abstract ”The problem of system recovery from transient faults is addressed using retry techniques. A probabilistic model for the activity of faulty periods, and a fault analysis to derive the optimum retry period are presented. Distribution functions are derived to represent the case of false alarm, where a transient fault is flagged as permanent, and the case of a miss because too many faults coexist, overcoming the checker's capability to detect them. These derivations are compared with the results of a simulation program representing the model. Other factors influencing the value of the retry period are discussed”
Transient-fault analysis for retry techniques Saleh, A.M. Patel, J.H. Bell Commun. Res., Red Bank, NJ;
Sadly there does appear to be areas and frequencies of serious omissions within your personal edification John, I can only make the presumption, albeit rebuttable, that these voids were created within a seminal portion of your life, possibly occurring betwixt your periods of enforced incarceration betwixt Nothinghamshire and your subsequent “transfer” to the Land of Downside Uppermost and brief sojourn on Happy Apple Island. I am in fact not only surprised but disappointed to find that you have not even an apparent awareness of the above published research paper, however, as always, I am happy, albeit in ignorant humbleness to assist in identifying and pointing out the areas of such beneficial scriptures wherever possible, I trust this post may help in some way. Ps. Most of my career was spent as a Development Engineer, whose main role in life is to either “develop” things, or, failing that, “make up” plausable excuses!
That takes me back to when I was about 20 yrs old, was sent to 52's face on nights in the Tupton seam, or better known as the Low main seam elsewhere. There was a problem on the Winster face signalling/indicating system. It had two, yes two No 13 box indications, went 12, 13, 13, 14. Well I changed the cables, both sides of the two No13 boxes, still had two 13's, finally made adjustments to the "Wheatstone Bridge" circuit in the console. Still two No13's, changed both 13 boxes out, no change. Errr I'm still as bloody confused as I was that night.
No, never heard of transients being called faults, they are part of life, everytime a contactor closes or opens on a load, a "spike" is generated. Thyristor controlled circuits create transients like they are going out of fashion, only way I know of "smoothing them" is introduce a "tuned" circuit into the offending circuit, to "smooth" the spikes out. Lightning introduces induced transients into telephone circuits and buried control lines. Devices are produced that will short those when they rise above a certain voltage. I've had many a pilot circuit diode "pop" by unknown transients. As I always used to say when the Deputy asked me why it had failed, "Effed if I know, I just diagnose the problem and rectify it" They could never see the joke.... errrr rectify... never mind.
Thanx John, and dazbt for the replies.... i have been asking a few of my old mates and they said that it means Transient Fault Analysis but its an Electrical engineering phrase im told??
It's a term I've not come across Stan, but transients were my worst nightmare at Boulby mine on afternoon shifts when they were commissioning the 7000hp rockshaft winder. The company was prepared and had had a unit installed knowing full well the static controls were going to produce all sorts of problems on the main electricity supply lines. It was called a static compensator, it's duty was to remove transients caused by the "firing" circuits of the thyristors controlling the large DC winder. When it was off, every Gate End Box underground used to trip out on E/L! The electronic earth leakage modules sensed the transients as an earth fault! Only happened on the braking cycle of the winders. Transients also cause solid state devices to fail, as they are usually high voltage spikes, even your TV and VCR/CD player has protection against transients via a couple of "varistors" across the mains side of the power supply.
Thanx John, and dazbt for the replies.... i have been asking a few of my old mates and they said that it means Transient Fault Analysis but its an Electrical engineering phrase im told??
stan (mickyf)
Hya Stan, I've been digging around in my 'mining library' and found an alternative definition for TFA which takes on a more mechanical twist, or hydraulic at least. "Total Flow Area" being a term used in various applications of hydraulics relating to straight forward calculations of such things as filtration surfaces to more complex aspects of fluid flow through jets integral to borehole cutting heads, both obviously having mining connotations. I suppose it could well be used in relation to any sort of fluid flow calculation whether it be liquids or gasses such as methane drainage or compressed air supplies. Where did you pick up the abbreviation in the first place and in what context was it used?
Oi tink I got it! Looks like it's to do with roof bolting, even though I worked in mines where roof bolting was common practice, it's still a new term to me. The FA is for "friction Anchor" Try here http://www.antech-tfa.com/en/4_application.html
Oi tink I got it! Looks like it's to do with roof bolting, even though I worked in mines where roof bolting was common practice, it's still a new term to me. The FA is for "friction Anchor" Try here http://www.antech-tfa.com/en/4_application.html
Now that looks good J, especially the 'wine cellar' bit, looks very probable.
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