Forum: Reliability & Maintainability Questions and Answers

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

Previous 5 messages

Posted by: Grib khider (kgrib@zodiac.com )
Organization:Aérazur - Zodiac group
Date posted: Mon Nov 8 7:10:55 US/Eastern 2004
Subject: Accelerated testing
Message:
We have performed an accelerated test using Arrhenius acceleration factor in order to obtain a service life of fuel tank (acceleration factor between life t at temperature T and life t’ at reference temperature T’).
For the test we have filled a tank with air instead of fuel. I am looking for a factor between air and fuel to apply in order to be more representative of tank utilization. I will really appreciate if someone have a method to obtain this factor or how we can do to be more realistic?

Replies: (list all replies)
Fuel Tank Accelerated Testing
bwd Tue Nov 9 14:57:20 US/Eastern 2004
Fuel Tank Accelerated Testing
Ken Thu Nov 11 16:29:00 US/Eastern 2004

Reply to this message


Posted by: vallon (jerome.vallon-renexter@renault.com )
Organization:renault
Date posted: Wed Nov 3 10:34:34 US/Eastern 2004
Subject: power semiconductor reliability data
Message:
I search some reliability data about power semiconductor like power MOSFET (75V, 100A) or IGBT (600V, 100A). this kind of device are used in power inverter (DC-AC converter, 40KW) with or without power cycling.
thank

Replies:
IGBT
bwd Wed Nov 3 13:46:22 US/Eastern 2004

Reply to this message


Posted by: Troy
Date posted: Thu Oct 28 15:28:25 US/Eastern 2004
Subject: Attribute Testing
Message:
I desire to use attribute testing to determine reliability at a given confidence level. Where can I get information regarding formulas used do derive reliability?

Replies:
Attribute Testing
bwd Tue Nov 2 14:09:01 US/Eastern 2004

Reply to this message


Posted by: PeteD (Pete.Daly@raymarine.com )
Organization:Raymarine
Date posted: Thu Oct 28 11:37:34 US/Eastern 2004
Subject: Component stress analysis
Message:
I would like to know if anyone is using any software packages that will input a netlist/bom from and electronic CAD ( Such as CADSTAR ), and perform a stress analysis on an actual circuit , calculating ratios like actual resistor power , capacitor voltage etc.

Reply to this message


Posted by: Tim Daniels (Tim.Daniels@Fernau.Com )
Date posted: Tue Oct 26 10:09:55 US/Eastern 2004
Subject: Spares level over set period of time
Message:
Sorry this may be a silly question but it's the first time I've done anything like this.
I need to calculate the number of spare LRUs required for a product to have 95% confidence level (of having a spare available) when the repair time is 10 months. I have failures/million hours figures and thought the RAC Poisson calculator for sparing was the answer! But now I have to consider a mission time of 18 months and calculate spares for this time only. I cannot see what will change. Can anybody give me any clues? Any ideas will be very much appreciated. Tim

Replies: (list all replies)
Spares
John Cloarec Wed Oct 27 4:20:19 US/Eastern 2004
Spares for finite mission time
Larry George Sat Oct 30 19:18:09 US/Eastern 2004
Spreadsheet simulation of finite mission with repair
Larry George Sun Oct 31 20:16:55 US/Eastern 2004

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