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Search: Posts Made By: RR_NDB
Showing results 1 to 35 of 146
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Forum: Tech Log
11th Mar 2013, 10:48
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Thumbs up Series parallel charging

Hi,

Mb @ #927

I fully agree with the concept of "parallel charging" you made implicit.

Actually i yet designed and yet using a prototype:

1) High current, through series config.
2) Low...
Forum: Tech Log
10th Mar 2013, 16:22
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Absolutely questionable design

Hi,

syseng68k:

Chris,



:mad:
Forum: Tech Log
8th Mar 2013, 19:11
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Fault tolerance and Graceful degradation

Hi,

mm43

The APU once online should be self sufficient, and not beholden to the state of APU battery.

:ok: Perfect!
Forum: Tech Log
8th Mar 2013, 18:39
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Fault tolerance and Graceful degradation

Hi,

inetdog



:{
Forum: Tech Log
8th Mar 2013, 18:36
Replies: 1,100
Views: 262,276
Posted By RR_NDB

They were warned

Hi,



:{
Forum: Tech Log
8th Mar 2013, 18:01
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Fault tolerance and Graceful degradation

Hi,

Objective should be, must be and can be:



Itīs ABSOLUTELY possible to start it (APU), keep it "well managed" even with the loss of the (APU) battery.

So, simply
Forum: Tech Log
8th Mar 2013, 17:27
Replies: 1,100
Views: 262,276
Posted By RR_NDB

APU stops when (APU) battery fails

Hi,

WHy?



Repeating:

Why?
Forum: Tech Log
8th Mar 2013, 16:46
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Battery management failure?

Hi,

Events surrounding auxiliary power unit shutdown. (http://www.ntsb.gov/investigations/2013/boeing_787/interim_report_B787_3-7-13.pdf)



:confused::mad::suspect:
Forum: Tech Log
22nd Feb 2013, 02:00
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Ground wire fused

Hi,

The ground wire (MAIN batt. ANA) was fused by internal short. (model)

How without a (internal) short to ground fuse this thick wire?

Posted earlier the equivalent circuit. Will think if...
Forum: Tech Log
21st Feb 2013, 01:46
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Electricity flow in a 787 'different from design'

Hi,

More precise information from NHK: (http://k.nhk.jp/daily/index7.html)

Japanese aviation authorities have uncovered a design fault in the electric wiring of a Boeing Dreamliner that made...
Forum: Tech Log
20th Feb 2013, 23:12
Replies: 1,100
Views: 262,276
Posted By RR_NDB

IFE was rebooting when PAX were exiting the plane in TAK

Hi,

sb_sfo



This is new for me. With multiple threads on the issue this may occur. :)

Let me understand: The smoke alarm in the FWD EE bay resets IFE?
Forum: Tech Log
20th Feb 2013, 21:14
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Fused ground wire

Hi,

FlightPathOBN:



Certainly the investigation will look to this fact. They had other priorities.

The things will become more interesting: Circuit analysis. :8 :cool:
Forum: Tech Log
20th Feb 2013, 20:44
Replies: 1,100
Views: 262,276
Posted By RR_NDB

IFE reboot

Hi,

FlightPathOBN


(http://www.pprune.org/tech-log/505695-787-batteries-chargers-39.html#post7706063)
VERY GOOD QUESTION! :ok:

Problem now seems much different than in BOS
Forum: Tech Log
20th Feb 2013, 19:39
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Hi, mm43 This seems to be a...

Hi,

mm43



This seems to be a problem not "connected" to the MAIN battery issue.

I did think if the destruction of the MAIN battery ground wire could damage this circuitry or control. Fact...
Forum: Tech Log
20th Feb 2013, 18:46
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Small advances in JTSB investigation

Hi,

FlightPathOBN:


:ok: Thank you!



The model i constructed in my mind in last weeks is being reviewed in light of this findings.
Forum: Tech Log
20th Feb 2013, 16:29
Replies: 1,100
Views: 262,276
Posted By RR_NDB

We may never understand WHY (BOS and TAK)

Hi,

cwatters:



Teething phase of batteries in a new aircraft :} :{ Uncharted waters.

FlightPathOBN:
Forum: Tech Log
20th Feb 2013, 16:06
Replies: 1,100
Views: 262,276
Posted By RR_NDB

LVP 65 cell detail

Hi,

Short to ground (that fused ground wire) "developed" through "hole" at cell side?

http://oi48.tinypic.com/a17p8h.jpg

See at pg 2 of JTSB report...
Forum: Tech Log
20th Feb 2013, 15:20
Replies: 1,100
Views: 262,276
Posted By RR_NDB

787 MAIN battery circuitry

Hi,

Finally precise information (http://www.pprune.org/tech-log/508176-design-review-787-plan-b-a350-xwb-triggered-lithium-ion-batteries.html#post7705490)

Observe the charging current below 75...
Forum: Tech Log
20th Feb 2013, 14:52
Replies: 1,100
Views: 262,276
Posted By RR_NDB

JTSB today

Hi,



In japanese
Forum: Tech Log
19th Feb 2013, 23:03
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Thumbs up The fact, apparently, is that under NORMAL usage-conditions...

Hi,

cockney steve:



So, letīs reduce this problem by half:
Forum: Tech Log
19th Feb 2013, 21:44
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Devil Management problems at ALL levels

Hi,

saptzae:



High rocks always are the ultimate responsible. And management failed: BMU/BMS guys feel the heat :mad:
Forum: Tech Log
19th Feb 2013, 21:09
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Comments on many posts

Hi,

FullWings:


(http://www.pprune.org/tech-log/505695-787-batteries-chargers-38.html#post7703916)
This comment triggered an idea will post on a Fault tolerant battery. Less risk of...
Forum: Tech Log
19th Feb 2013, 18:20
Replies: 1,100
Views: 262,276
Posted By RR_NDB

No powered plane without fire*

Hi,

Dtype:

[/URL]

You introduce an important point: We operate (and live with) machines with contained fires. What is not accepted is:

A company introduce a new design (under special...
Forum: Tech Log
19th Feb 2013, 01:38
Replies: 1,100
Views: 262,276
Posted By RR_NDB

"Convoluted mess"

Hi,

FlightPathOBN:



I am working on that and will post in the Redesign thread (http://www.pprune.org/tech-log/508176-design-review-787-plan-b-a350-xwb-triggered-lithium-ion-batteries.html)
Forum: Tech Log
18th Feb 2013, 23:05
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Devil A backup that heats, smokes and expel fire? And not works as a backup?

Hi,

FullWings:



Good point! :ok: Will think on this.


I agree.
Forum: Tech Log
18th Feb 2013, 21:32
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Look more carefully to what i posted

Hi,

Bill,



:=


:=
Forum: Tech Log
18th Feb 2013, 21:07
Replies: 1,100
Views: 262,276
Posted By RR_NDB

ANA TAK model

Hi,

inetdog:



Whatīs remarkable is:

Screw just disappeared. Section of strap too.
Forum: Tech Log
18th Feb 2013, 16:02
Replies: 1,100
Views: 262,276
Posted By RR_NDB

What is a Thermal runaway?

Hi,

Reading some posts in the many threads created after 787 battery incidents it seems useful to remember, some important points on "Thermal runaway":

1) Itīs a "positive feedback" mechanism....
Forum: Tech Log
17th Feb 2013, 23:08
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Sort term fix?

:ok: This article confirm our concerns



:confused:



Letīs exercise:
Forum: Tech Log
15th Feb 2013, 13:31
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Ni Mh

Hi,

rogerg:


Just a question. Now that AB seems to be going back to ni-cad due to the uncertanty of lithium has the use of ni-nmh been considered. In model use they do the similar job to ni-cd...
Forum: Tech Log
12th Feb 2013, 19:38
Replies: 1,100
Views: 262,276
Posted By RR_NDB

And it was just a battery

Hi,

Smilin_Ed:



:sad:
Forum: Tech Log
12th Feb 2013, 19:32
Replies: 1,100
Views: 262,276
Posted By RR_NDB

DG

Hi,

FlightPathOBN:



Even 11 pounds as cargo in PAX planes could be risky.

:{
Forum: Tech Log
12th Feb 2013, 18:58
Replies: 1,100
Views: 262,276
Posted By RR_NDB

An inflight fire inside FWD EE bay was going to happen

Hi,

A simple analysis (equivalent circuit) reveal ANA at TAK case was benign because battery (very probably) destructed an aircraft cable and was (due heat in cell # 3 plus terminal region)...
Forum: Tech Log
12th Feb 2013, 17:44
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Redundancy and voting

Hi,

HazelNuts39:


Yes, may be. The designers (of the battery) clearly assumed temperature of the cells would not be a problem. "Brief" APU use, MAIN batt. use only in emergencies (remember for...
Forum: Tech Log
12th Feb 2013, 16:01
Replies: 1,100
Views: 262,276
Posted By RR_NDB

Hi, HazelNuts39, Machaca posted: ...

Hi,

HazelNuts39,

Machaca posted:



Unless there is a similar connector in other PCB point i donīt think the wires are coming from temp. probes for each 8 cells. This (ideally) would...
Showing results 1 to 35 of 146
 
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