Forum: Reliability & Maintainability Questions and Answers

Add a Message About this forum
Newer messages are at the top

Previous 5 messages

Posted by: Juan C. Rodenas
Organization:EINsA
Date posted: Mon Oct 9 7:53:56 US/Eastern 2000
Subject: Non-mechanical Reliability
Message:

We are a spanish company, just introducing on the reliability studies, due to our compromise at military sales. Right now, I am trying to obtain as much data as I can about this issues. I have found plenty of data for electronic reliability. The only reference I have about non-electronic reliability data is NPRD-95, but I have no idea of what class of mechanical data I will find in this data, prior to the adquisition.For example, I will need data about pump, hidraulyc valves, etc. Can somebody explain to me what kind of data I can expect to find in this book. or where can I obtain that information.

Replies: (list all replies)
Non-Mechanical Reliability
Ed Sherwin Mon Oct 9 11:36:26 US/Eastern 2000
Non-mechanical reliability
Jean-Marie Cloarec Tue Oct 10 7:39:37 US/Eastern 2000
Non electronic reliability
E AZIZA Mon Jun 25 13:08:54 US/Eastern 2001

Reply to this message


Posted by: Chad
Date posted: Thu Oct 5 13:38:35 US/Eastern 2000
Subject: Reliability and Confidence Allocation
Message:
In many cases we need to allocate system reliability requirements down to component level. Reliability allocation is quite straight forward by using block diagram; however, what would be a good approach to allocate confidence requirement? If I demostrated reliability at 90% confidence for all components, can I calculate system reliability by using block diagram and claim 90% confidence at system level without system level testing? Any good suggestions, reference?

Replies:
Allocation
Jean Marie Cloarec Tue Oct 10 7:45:01 US/Eastern 2000

Reply to this message


Posted by: JJC
Date posted: Wed Oct 4 7:55:26 US/Eastern 2000
Subject: Confidence Levels
Message:
Could somebody provide me with a definition or a source of reference for confidence levels? i.e. 60% confidence level, Upper CL and Lower CL.
Also, how is the CL determined? Thanks in advance

Replies:
Confidence levels
Jean Marie Cloarec Tue Oct 10 7:59:26 US/Eastern 2000

Reply to this message


Posted by: Richard Golek
Date posted: Thu Sep 21 12:42:14 US/Eastern 2000
Subject: glass thermistors with axail leads
Message:
We have begun forming the leads on axial thermistors with glass bodies. 50 to 90X visual inspection reveals small cracks near the glass/lead interface on a small percentage of the parts. Our own test program has just begun, and the vendor has not been able to supply more data. I am looking for comments on what the long term humidity and resistance effects may be, paticularly in a tropical but benign environment. Thank you.

Replies:
Thermistor Reliability
Bruce Dudley Thu Sep 21 15:42:00 US/Eastern 2000

Reply to this message


Posted by: Sheila Prather (sheila_s_prather@mail.northgrum.com )
Organization:Northrop Grumman Corporation
Date posted: Wed Sep 20 14:25:14 US/Eastern 2000
Subject: Operational Parameter Translation - Question #2
Message:
This is a followup to my question posted on 9/11/00 regarding the TR-89-299. I've noted the caution that should be exercised when using this document...this question addresses the examples that are published in the "Reliability Toolkit: Commercial Practices Edition". I see where example #1 has been corrected from the previous 4/93 version of the toolkit; but, my question rests with example #2.
Looking at Section 5.4.1.1 of TR-89-299, in example #2 why was the field number for flight hour determination based on 1,672 hours versus 1,000 hours (50% of 2,000)?

Replies:
Operational Parameter Translation
Bruce Dudley Wed Sep 20 14:59:37 US/Eastern 2000

Reply to this message


Next 5 messages

| 1...5 | 6...10 | 11...15 | 16...20 | 21...25 | 26...30 | 31...35 | 36...40 | 41...45 | 46...50 | 51...55 | 56...60 | 61...65 | 66...70 | 71...75 | 76...80 | 81...85 | 86...90 | 91...95 | 96...100 | 101...105 | 106...110 | 111...115 | 116...120 | 121...125 | 126...130 | 131...135 | 136...140 | 141...145 | 146...150 | 151...155 | 156...160 | 161...165 | 166...170 | 171...175 | 176...180 | 181...185 | 186...190 | 191...195 | 196...200 | 201...205 | 206...210 | 211...215 | 216...220 | 221...225 | 226...230 | 231...235 | 236...240 | 241...245 | 246...250 | 251...255 | 256...260 | 261...265 | 266...270 | 271...275 | 276...280 | 281...285 | 286...290 | 291...295 | 296...300 | 301...305 | 306...310 | 311...315 | 316...320 | 321...325 | 326...330 | 331...335 | 336...340 | 341...345 | 346...350 | 351...355 | 356...360 | 361...365 | 366...370 | 371...375 | 376...380 | 381...385 | 386...390 | 391...395 | 396...400 | 401...405 | 406...410 | 411...415 | 416...420 | 421...425 | 426...430 | 431...435 | 436...440 | 441...445 | 446...450 | 451...455 | 456...460 | 461...465 | 466...470 | 471...475 | 476...480 | 481...485 | 486...490 | 491...495 | 496...500 | 501...505 | 506...510 | 511...515 | 516...520 | 521...525 | 526...530 | 531...535 | 536...540 | 541...545 | 546...550 | 551...555 | 556...560 | 561...565 | 566...570 | 571...575 | 576...580 | 581...585 | 586...590 | 591...595 | 596...600 | 601...605 | 606...610 | 611...615 | 616...620 | 621...625 | 626...630 | 631...635 | 636...640 | 641...645 | 646...650 | 651...655 | 656...660 | 661...665 | 666...670 | 671...675 | 676...680 | 681...685 | 686...690 | 691...695 | 696...700 | 701...705 | 706...710 | 711...715 | 716...720 | 721...725 | 726...730 | 731...735 | 736...740 |

Add a Message About this forum