I think I remember that an industrialist had considered the baby stroller with electric assistance (in particular the case of the double or even triple stroller which can become heavy to push in the ribs), but had given up before the regulatory barriers ...Grelinette wrote:For the other interesting applications that can use this principle, I think it would be applicable from the bicycle trailer to the baby stroller, via the rolling suitcase
electric horse-drawn tow !!!
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Forhorse wrote:Alain G wrote:
There is nothing revolutionary in a simple variable resistance and a damped spring provided with an acceleration and deceleration adjustment which is done electronically by a simple capacitor.
Yeah well it's still a "force sensor" as you say. it therefore remains a resistance which varies according to the force that is applied to it.
Since you've been in the "load-cell" industry for 20 years (say you've worked 20 years in lots of areas it's crazy ...) you will explain to me the fundamental difference between a potentiometer that measures the deformation of a spring and a strain gauge (and yes if in French we use the term "strain gauge" rather than "force sensor" it is well to precisely name a very precise system)
I am in the food sector and we have to know a wide range of fields to exercise our profession.
The strain gauge is applied to the deforming mechanical part which can vary in shape and the force sensor is the combination of both!
For the English term it is indeed "Load cell" in the case of an electronic scale and I do not see the reason to shout on the exact words that everyone wants to give to this sensor!
Last edited by Alain G the 29 / 01 / 13, 18: 01, 1 edited once.
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Stepping behind sometimes can strengthen friendship.
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Alain
Criticism is good if added to some compliments.
Alain
Gaston wrote:Be wary of word-for-word translationsAlain G wrote:I didn't look for the French term because we have always called this gadget a load cell which word for word translates as "load cell"
As much "load cell" is understandable for someone who knows a little about the subject, as much "load cell" is not at all the appropriate term for a French (not to mention the "that of load")
Do a search and you will see that load cell is a good fit as a translation and "that" was a spelling error.
Sorry for the error!
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Stepping behind sometimes can strengthen friendship.
Criticism is good if added to some compliments.
Alain
Criticism is good if added to some compliments.
Alain
Grelinette wrote:Perhaps a simpler and more economical solution with a piezoelectric sensor
http://fr.wikipedia.org/wiki/Pi%C3%A9zo ... icit%C3%A9
No it could not work because this piezo create electricity with a tension or a movement and does not allow to know the position.
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Stepping behind sometimes can strengthen friendship.
Criticism is good if added to some compliments.
Alain
Criticism is good if added to some compliments.
Alain
Gaston wrote:I think I remember that an industrialist had considered the baby stroller with electric assistance (in particular the case of the double or even triple stroller which can become heavy to push in the ribs), but had given up before the regulatory barriers ...Grelinette wrote:For the other interesting applications that can use this principle, I think it would be applicable from the bicycle trailer to the baby stroller, via the rolling suitcase
It already exists on your electric bikes which only work by pedaling, the motor gives more force if you pedal harder!
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Stepping behind sometimes can strengthen friendship.
Criticism is good if added to some compliments.
Alain
Criticism is good if added to some compliments.
Alain
Grelinette wrote: an identical gauge with a capacity of 500 kg which was worth around € 200 each. (A special national education prize: another advantage of going through students!)
Advantage I'm not sure ... when it comes to public procurement some know how to put their pockets in it.
200 € for 500Kg of load is precisely the price charged by radiospares, which is a supplier which is far from being deemed cheap.
After when you don't need extreme precision, you can actually use a mechanical system to increase the effort to be measured.
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- Obamot
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Grelinette wrote:I add a small remark to my previous comment about the algorithm used. We have made several calculation tests to control the wheel motors according to the force delivered by the horse.
In certain cases, the motor response is constant and regular, but the quality of assistance is lost when the horse provides a "collar stroke" ie when there is a peak in the traction (starting, acceleration like the passage of the not too much, ...).
Conversely, managing peaks deteriorates the quality of the engine response when the horse is installed at a constant pace.
A simple solution could be to have the possibility to select from among a few pre-established algorithms corresponding to specific traction situations (uphill, flat, sport course, walk, agricultural work, etc.), and the ideal would be an algorithm that s adapts "intelligently" to the situation and which is automatically enriched by measurements from past traction situations.
For example, an algorithm that analyzes peaks and attempts to remove them. A kind of artificial intelligence.
This would be all the more interesting as it would allow the system to also adapt to the type of harnessed horse (strong and slow draft horse, lively and fast thoroughbred, pony, ... even stubborn bum, lazy horse, etc. .
In short, there is still a lot of grain to grind with this project. We have already mentioned the possibility of improving the concept for version 2.0 of the hybrid carriage! If you have any ideas ...
A team with several horses ... It shouldn't be the same at all, amha.
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Grelinette wrote:I add a small remark to my previous comment about the algorithm used. We have made several calculation tests to control the wheel motors according to the force delivered by the horse.
In certain cases, the motor response is constant and regular, but the quality of assistance is lost when the horse provides a "collar stroke" ie when there is a peak in the traction (starting, acceleration like the passage of the not too much, ...).
Conversely, managing peaks deteriorates the quality of the engine response when the horse is installed at a constant pace.
A simple solution could be to have the possibility to select from among a few pre-established algorithms corresponding to specific traction situations (uphill, flat, sport course, walk, agricultural work, etc.), and the ideal would be an algorithm that s adapts "intelligently" to the situation and which is automatically enriched by measurements from past traction situations.
For example, an algorithm that analyzes peaks and attempts to remove them. A kind of artificial intelligence.
This would be all the more interesting as it would allow the system to also adapt to the type of harnessed horse (strong and slow draft horse, lively and fast thoroughbred, pony, ... even stubborn bum, lazy horse, etc. .
In short, there is still a lot of grain to grind with this project. We have already mentioned the possibility of improving the concept for version 2.0 of the hybrid carriage! If you have any ideas ...
It can be done with a PID regulator, this is what I use on my PH controllers at the factory and it allows to stabilize the quantity of dosage and it also works for an engine control. My heating thermostat also uses this process.
Link:
http://fr.wikipedia.org/wiki/R%C3%A9gulateur_PID
http://clubelek.insa-lyon.fr/joomla/fr/ ... oduc_5.php
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Stepping behind sometimes can strengthen friendship.
Criticism is good if added to some compliments.
Alain
Criticism is good if added to some compliments.
Alain
- Grelinette
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In action ...
(at the controls, the coachman, alias Grelinette, next to it, Alexandre the student engineer), and in front, Nénuphar, the main engine. With 2 wheel motors the results are already very good: the horse attacks this good climb in a good trot and without effort.
This week we are fixing the other 2 wheel motors: it will be a 4x4 carriage!
(at the controls, the coachman, alias Grelinette, next to it, Alexandre the student engineer), and in front, Nénuphar, the main engine. With 2 wheel motors the results are already very good: the horse attacks this good climb in a good trot and without effort.
This week we are fixing the other 2 wheel motors: it will be a 4x4 carriage!
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Project of the horse-drawn-hybrid - The project econology
"The search for progress does not exclude the love of tradition"
"The search for progress does not exclude the love of tradition"
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