Hi,

I was doing a classification of Redundant systems, which I believe is needed as the current notation of 1:1 or TMR does not suffice.

I have put the work done so far at website www.smbd.org at the reliability section.

For the time being I have shelved my hobby project on Cruise control.

I hope that the reliability section is useful.

Since the work will go on further, based on any reviews that I may get and some work that is planned in the forthcoming weeks, I have not even done a spell check as I am expecting some changes by next weekend i.e. next friday for me.

The section is informative and at the same time also challenges some currently held views. I reuqest all of you to go through this section and give your comments. It will help in creating a educational resource for understanding reliability.

regards, Anand Iyer

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visit www.smbd.org
Better Automation for a better future
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Anand,

I'm notclear about what you are proposing. If you want diversity of viewpoints, then, checkout my approach.

Based on I/O diagnostics, it has been published in The Journal of the System Safety Society magazine:

"Hazard Prevention" Vol 35, No. 3, 3rd Qtr 1999.

My paper is titled "Probabilistic Risk Assessment of Equipment Safety Systems"

One sub-section is titled "The Fallacy of TMR!"

Regards,
Phil Corso, PE
Boca Raton, FL
[[email protected]] ([email protected]) {[email protected]}

 

Hi Phil,

I would like to read your article. Can you please tell me how I can get it? Is it available online?

In this section on reliability, I am currently trying to classify various redundant systems.

In the second phase, the advantages and disadvantages of the various identified systems will be addressed.

This will create a system which will allow clearer understanding the concept and the variety in redundancy and have thumb rule advantages and disadvantages.

Preliminary conceptual breakup:

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The first section should be an introduction to redundancy and fault tolerance and also clarify the difference between fault tolerance and redundancy.

Second section will consist of various classification and subclassifications of the redundant system. Pro's and con's of each will also be addressed here.

Third section will consist of guidelines for design of a fault tolerant system.

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As is evident from the material at the website, this is at a very preliminary stage. And as it progresses, things may look slightly different based on new realities that may appear with time.

And there is time limitation. Only one week-end holiday and takes a heavy toll on family if I am glued to my Laptop.

Regards,
Anand Iyer

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Visit http://www.smbd.org
The website that changes regularly
Cruise Control project ongoing on www.smbd.org
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Anand,

"Hazard Prevention" magazine is published by AS Watermam Inc. Their tel # is, 508-336-8879, and their e-mail is :

[email protected]

Regards,
Phil Corso, PE
Boca Raton, FL
[[email protected]] ([email protected]) {[email protected]}