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Tony Szamboti - Errors, Lies and Distortions

Over the last few years , Tony Szamboti has been provided with almost endless advice, detailed correction, step-by-step instruction and volumous data proving major, and terminal, issues with his ever-changing theories and beliefs concerning the motion and behaviour of WTC1 during the few seconds fol...
by femr2
on Wed Sep 25, 2013 5:35 pm
 
Forum: Leadership and Group Dynamics
Topic: Tony Szamboti - Errors, Lies and Distortions
Replies: 0
Views: 871

Re: WBB Force Plate Tests

Dropped from what elevation? From about 6" like this one ? Ish. I'll get around to some precise tests soon. Just getting a feel for how it behaves at the mo. (I want to compare the two cases, pre-stressed or not, so I need the same elevation.) Yeah, I'll be using a ruler for "proper"...
by femr2
on Wed Sep 11, 2013 1:51 pm
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

Quick test of pre-stressing the plate (by standing on it and dropping the bag of sugar... :lol: )

Click for full size image

1) Shorter time to recovery.

2) Higher peak.

3) Still some "negative" response.
by femr2
on Tue Sep 10, 2013 1:45 pm
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

The area under the positive pulse curve should equal the change of momentum (with proper units in mind). Proper units ? The more experiments there are, the more apparent it is that coupling with the impacted body - and the resulting measurement apparatus - is the interesting part. Removing as much ...
by femr2
on Tue Sep 10, 2013 2:04 am
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

OneWhiteEye wrote:If it is true that the peak has been between samples, just repeating the experiment many times should allow it to be caught. If you do a lot of trials and it stays pretty tight, then it's something else.

Easily checked :) Drop, drop, drop :)
by femr2
on Tue Sep 10, 2013 1:55 am
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

I am guessing it is something else. The shape of the curve looks like some kind of clip. If the same shape is reproduced among many trials, there is an internal mechanism protecting the circuit from peak dynamic current values, like a shunting diode. Would such a protection circuit clip peak values...
by femr2
on Tue Sep 10, 2013 1:54 am
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

In your case it takes about 20 data points to go from collision to the scale showing a stable new weight. At 100 hz this is about 1/5 of a second to respond and become stable and static again. Much better than the original experiment at JREF. Not a bad force detector at all. Shame I can't break the...
by femr2
on Tue Sep 10, 2013 1:18 am
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

I certainly don't want you to damage the instrument by putting it on a hard floor and removing the rubber feet, but that is how you create the best approximation to the delta function and see what that puppy can do. The poor thing probably isn't designed for such a hard impact, but to test the extr...
by femr2
on Tue Sep 10, 2013 1:10 am
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

Next question is the peak value. Does the number have objective meaning? Will be quite difficult to quantify... http://www.omega.com/techref/pdf/StrainGage_Measurement.pdf Sample rate will be one unavoidable factor...100 Hz is relatively low. From the doc above, it would seem response time is down ...
by femr2
on Tue Sep 10, 2013 1:06 am
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

My guess is that the portion of the scale that shows you the results in kg is actually measuring downward displacement. So, with a bit of research, no. There are four strain guages, which work by the changing resistance of wire when under tension. There is VERY slight bending of the metal "str...
by femr2
on Tue Sep 10, 2013 12:19 am
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

The bending in the metal is practically imperceptible to the naked eye: for instance, someone weighing 220 pounds would distort it by less than a millimeter Some motion :) Strain gauges measure the level of stress applied to an object. A gauge consists of a single, long electrical wire that is loop...
by femr2
on Mon Sep 09, 2013 8:46 pm
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

Major_Tom wrote:Are there cases elsewhere in which a researcher uses these things for precise dynamic responses?

Not short duration, afaik.

Many studies have been perfoermed in medical areas of CoP...

http://the911forum.freeforums.org/attributes-of-a-rubble-driven-collapse-t426-75.html#p22040
by femr2
on Mon Sep 09, 2013 6:51 pm
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

1 kg of sugar reality check: http://femr2.ucoz.com/_ph/9/16061659.png 1) There is no such thing as negative weight. This must be a result of the instrument responding. 2) Sinusoidal decay. This must be the instrument unless anyone can suggest why that is expected against a big, thick slab of concre...
by femr2
on Mon Sep 09, 2013 6:49 pm
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822

Re: WBB Force Plate Tests

My guess is that the portion of the scale that shows you the results in kg is actually measuring downward displacement. Nah. Electrical resistance based pressure sensors I'd suggest. There's no travel in the board itself. One of these... uPCl7GTvZ84 That number appears to you as kg. There's "r...
by femr2
on Mon Sep 09, 2013 5:54 pm
 
Forum: Other technical issues
Topic: WBB Force Plate Tests
Replies: 35
Views: 6822
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