http://caravantimes.co.uk/video/makes/bailey/bailey-towing-simulator-shows-how-to-load-your-caravan-correctly-$21384351.htm
This is worth a read. Copied from CT.
This is worth a read. Copied from CT.
Bailey and University of Bath
- Thread starter Dustydog
- Start date
Well worth looking at but it was on either Caravan Finder TV or the PC programme some months ago.
Just to correct the Caravan Times editorial its Dr Jos Darling.
The same basic simulator was shown some time ago,
http://www.towingstabilitystudies.co.uk/stability-studies-simulator.php
But the experimental criteria were slightly different. The original experiment and demonstrator were only looking at the yaw inertia along the long axis of the simulated caravan. In all of the public simulations the actual mass of the trailer remained the same, only the longitudinal displacement of the loads changed.
The revised simulator now has a 'caravan floor' which enables loads of various masses to be added and to be placed at at will on the trailers load area. So the mass of the trailer is changing, and the loads may not necessarily sit on the long axis.
I know the simulator was used with considerable effect to help with the initial study, with many different combinations of mass and displacement investigated. But I do question the set up used for public demonstrations of the effect.
Perhaps the set up was chosen to maximise the undesirable effects of Yaw inertia, (after all this was part of Baileys marketing display), but there were a few points that leave questions in my mind.
We are told the model is a 1 tenth size, but does that also represent a scale weight? Does the model of the car accurately mimic its mass and mass distribution?.
What about the velocity of the treadmill, it starts at 5Kmh and goes up to 16Kmh, how do these compare to full size road speeds?
In reality we have no control on the distribution of the majority of the mass of a caravan, that is fixed by the caravan manufacturer, All we can do is manipulate the pay load which is usually no more than about 25% of the MTPLM. Does the model accurately demonstrate this constraint?
On the original demonstration, the rear mass appeared to be about twice as big as the forward mass and was displaced by almost twice as much away from the axle. Is this a air representation of a caravan?
It is important to consider yaw inertia, and the guiding principles of reducing it by loading close to the axle is still sound advice, Its a shame the demonstrations are so extreme, Personally I would prefer to see a truly representative caravan model being used to inform rather than to only shock.
The same basic simulator was shown some time ago,
http://www.towingstabilitystudies.co.uk/stability-studies-simulator.php
But the experimental criteria were slightly different. The original experiment and demonstrator were only looking at the yaw inertia along the long axis of the simulated caravan. In all of the public simulations the actual mass of the trailer remained the same, only the longitudinal displacement of the loads changed.
The revised simulator now has a 'caravan floor' which enables loads of various masses to be added and to be placed at at will on the trailers load area. So the mass of the trailer is changing, and the loads may not necessarily sit on the long axis.
I know the simulator was used with considerable effect to help with the initial study, with many different combinations of mass and displacement investigated. But I do question the set up used for public demonstrations of the effect.
Perhaps the set up was chosen to maximise the undesirable effects of Yaw inertia, (after all this was part of Baileys marketing display), but there were a few points that leave questions in my mind.
We are told the model is a 1 tenth size, but does that also represent a scale weight? Does the model of the car accurately mimic its mass and mass distribution?.
What about the velocity of the treadmill, it starts at 5Kmh and goes up to 16Kmh, how do these compare to full size road speeds?
In reality we have no control on the distribution of the majority of the mass of a caravan, that is fixed by the caravan manufacturer, All we can do is manipulate the pay load which is usually no more than about 25% of the MTPLM. Does the model accurately demonstrate this constraint?
On the original demonstration, the rear mass appeared to be about twice as big as the forward mass and was displaced by almost twice as much away from the axle. Is this a air representation of a caravan?
It is important to consider yaw inertia, and the guiding principles of reducing it by loading close to the axle is still sound advice, Its a shame the demonstrations are so extreme, Personally I would prefer to see a truly representative caravan model being used to inform rather than to only shock.
ProfJohnL said:
Own up John.
You are going for a post grad Professorship
Will you be doing it locally or at Bath?
Dustydog said:Own up John.
You are going for a post grad Professorship
Will you be doing it locally or at Bath?
Hello Dusty,
You joke but I didn't want to shout about it , but I was at Bath last week for the graduation awards. I have got to make space on the wall for the new award picture.
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