A picture a day....biker banter (Vol 4)
Discussion
13aines said:
Oh, so close!
It's a four post rig (or shaker rig as the americans say) for testing suspension setups in a controlled environment in order to optimise the vehicles handling characteristics.
I'm investigating how contact patch area varies over a typical road profile, in order to verify a dynamics model I will be producing in multi-body dynamics software, so that the model can be used to optimise the vehicles setup as opposed to costly time consuming testing on equipment that is pretty rare outside F1 and the big car manufacturers.
Under the bed are four huge very expensive hydraulic actuators that you can move around as you please to adjust track & wheelbase, hence I could set it up to get a bike on it. They're apparently accurate to 1 micron!
The sensors in the actuators allow me to measure contact patch pressure (from which I can calculate area I believe - not sure how yet!) and with accelerometers on the axles and suspension hard-points I can calculate the vertical displacements of the wheels.
Sticking bikes on it isn't very common. They're very hard to fix in order to prevent them falling over but allow them to move as they would if they were travelling along the straight of a track. There are a lot of assumptions involved too as the rider has a massive input on the bikes handling, as we know, as do the centripetal forces generated when the bike is moving - which we don't have on the rig obviously.
I wanted to test the bike at fixed angles of lean to simulate exiting a corner and getting on the power but i'm unable to do this due to limitations in the equipment, so unfortunately it's got to be upright only. I will collect some data with it leaning (hanging on a bungee) but I can't fix the lean angle, so I can't simulate the test in the software (can't measure how the lean will fluctuate easily) which is the whole aim of the project - to do the testing on the rig in order to verify the computer model.
If I'm reading this correctly (which I may not be!) won't things like braking and accelerating have a huge affect the contact area/patch? In other words a bike hard under power coming out of a corner will create a bigger footprint than one 'idling'?It's a four post rig (or shaker rig as the americans say) for testing suspension setups in a controlled environment in order to optimise the vehicles handling characteristics.
I'm investigating how contact patch area varies over a typical road profile, in order to verify a dynamics model I will be producing in multi-body dynamics software, so that the model can be used to optimise the vehicles setup as opposed to costly time consuming testing on equipment that is pretty rare outside F1 and the big car manufacturers.
Under the bed are four huge very expensive hydraulic actuators that you can move around as you please to adjust track & wheelbase, hence I could set it up to get a bike on it. They're apparently accurate to 1 micron!
The sensors in the actuators allow me to measure contact patch pressure (from which I can calculate area I believe - not sure how yet!) and with accelerometers on the axles and suspension hard-points I can calculate the vertical displacements of the wheels.
Sticking bikes on it isn't very common. They're very hard to fix in order to prevent them falling over but allow them to move as they would if they were travelling along the straight of a track. There are a lot of assumptions involved too as the rider has a massive input on the bikes handling, as we know, as do the centripetal forces generated when the bike is moving - which we don't have on the rig obviously.
I wanted to test the bike at fixed angles of lean to simulate exiting a corner and getting on the power but i'm unable to do this due to limitations in the equipment, so unfortunately it's got to be upright only. I will collect some data with it leaning (hanging on a bungee) but I can't fix the lean angle, so I can't simulate the test in the software (can't measure how the lean will fluctuate easily) which is the whole aim of the project - to do the testing on the rig in order to verify the computer model.
Edited by 13aines on Friday 27th November 11:17
scunnylad said:
Beautiful tz,2007 model,last year they were made iirc
A mate of mine is doing some work on it ready for next year's 250cc championship.
Main goal tho is the Manx gp where we will be fettling it.
Nice does it still belong to St Neots motorcycles? Got my fairings from themA mate of mine is doing some work on it ready for next year's 250cc championship.
Main goal tho is the Manx gp where we will be fettling it.
Yazza54 said:
scunnylad said:
Beautiful tz,2007 model,last year they were made iirc
A mate of mine is doing some work on it ready for next year's 250cc championship.
Main goal tho is the Manx gp where we will be fettling it.
Nice does it still belong to St Neots motorcycles? Got my fairings from themA mate of mine is doing some work on it ready for next year's 250cc championship.
Main goal tho is the Manx gp where we will be fettling it.
srob said:
If I'm reading this correctly (which I may not be!) won't things like braking and accelerating have a huge affect the contact area/patch? In other words a bike hard under power coming out of a corner will create a bigger footprint than one 'idling'?
This, and the compression of the suspension when cornering a bike ( due to centrifugal "force") will be hard to mimic stationary. But I guess you can allow for this somehow as you would have to when the outer suspension in a car compresses & the inner extends??13aines said:
Oh, so close!
It's a four post rig (or shaker rig as the americans say) for testing suspension setups in a controlled environment in order to optimise the vehicles handling characteristics.
I'm investigating how contact patch area varies over a typical road profile, in order to verify a dynamics model I will be producing in multi-body dynamics software, so that the model can be used to optimise the vehicles setup as opposed to costly time consuming testing on equipment that is pretty rare outside F1 and the big car manufacturers.
Under the bed are four huge very expensive hydraulic actuators that you can move around as you please to adjust track & wheelbase, hence I could set it up to get a bike on it. They're apparently accurate to 1 micron!
The sensors in the actuators allow me to measure contact patch pressure (from which I can calculate area I believe - not sure how yet!) and with accelerometers on the axles and suspension hard-points I can calculate the vertical displacements of the wheels.
Sticking bikes on it isn't very common. They're very hard to fix in order to prevent them falling over but allow them to move as they would if they were travelling along the straight of a track. There are a lot of assumptions involved too as the rider has a massive input on the bikes handling, as we know, as do the centripetal forces generated when the bike is moving - which we don't have on the rig obviously.
I wanted to test the bike at fixed angles of lean to simulate exiting a corner and getting on the power but i'm unable to do this due to limitations in the equipment, so unfortunately it's got to be upright only. I will collect some data with it leaning (hanging on a bungee) but I can't fix the lean angle, so I can't simulate the test in the software (can't measure how the lean will fluctuate easily) which is the whole aim of the project - to do the testing on the rig in order to verify the computer model.
I was just about to say that.It's a four post rig (or shaker rig as the americans say) for testing suspension setups in a controlled environment in order to optimise the vehicles handling characteristics.
I'm investigating how contact patch area varies over a typical road profile, in order to verify a dynamics model I will be producing in multi-body dynamics software, so that the model can be used to optimise the vehicles setup as opposed to costly time consuming testing on equipment that is pretty rare outside F1 and the big car manufacturers.
Under the bed are four huge very expensive hydraulic actuators that you can move around as you please to adjust track & wheelbase, hence I could set it up to get a bike on it. They're apparently accurate to 1 micron!
The sensors in the actuators allow me to measure contact patch pressure (from which I can calculate area I believe - not sure how yet!) and with accelerometers on the axles and suspension hard-points I can calculate the vertical displacements of the wheels.
Sticking bikes on it isn't very common. They're very hard to fix in order to prevent them falling over but allow them to move as they would if they were travelling along the straight of a track. There are a lot of assumptions involved too as the rider has a massive input on the bikes handling, as we know, as do the centripetal forces generated when the bike is moving - which we don't have on the rig obviously.
I wanted to test the bike at fixed angles of lean to simulate exiting a corner and getting on the power but i'm unable to do this due to limitations in the equipment, so unfortunately it's got to be upright only. I will collect some data with it leaning (hanging on a bungee) but I can't fix the lean angle, so I can't simulate the test in the software (can't measure how the lean will fluctuate easily) which is the whole aim of the project - to do the testing on the rig in order to verify the computer model.
Asv levers on caliper rebuilt and on then bleed.
Sadly after bleeding my brakes I went to check the other caliper just to be sure it was ok. Bloody Allen head bolt that holds the pads in rounded. It's been on the way out for sometime.
So now I'll need to split it, slide one side of caliper off and turn it with grips.
I hate siezed and rounded bolts. I'm terrible with them.
Reardy Mister said:
Biker's Nemesis said:
It's a 1.6
gI think those new Transits look mint. Such a shame they don't give them some extra mumbo though. And they have some making up to do after those hideous fake exhaust tips on the previous model.
Is there a 2.0l option? Blue fin chip?
They are getting power and torque up on these with upto 140hp now and 250 ft lb torque which aint bad. They have that engine running 160 in cars and are working on a 180hp car version...from a 1.6 Diesel!
Getting cleaned and treated with ACF-50 today at Loomies.
Only 65 quid for the full clean and treatment. Plus a tenner in fuel. And a tenner for the brekky I scoffed while I waited. And 70 to supply and fit the indicator that was detroyed by a rock from passing car, en route to the venue.
dean100yz said:
Reardy Mister said:
Biker's Nemesis said:
It's a 1.6
gI think those new Transits look mint. Such a shame they don't give them some extra mumbo though. And they have some making up to do after those hideous fake exhaust tips on the previous model.
Is there a 2.0l option? Blue fin chip?
They are getting power and torque up on these with upto 140hp now and 250 ft lb torque which aint bad. They have that engine running 160 in cars and are working on a 180hp car version...from a 1.6 Diesel!
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