A picture a day....biker banter (Vol 4)
Discussion
Biker's Nemesis said:
Moulder said:
moanthebairns said:
13aines said:
Can anyone guess? (Steve B you're not allowed to answer
)Edited by 13aines on Thursday 26th November 21:05
13aines said:
Biker's Nemesis said:
Moulder said:
moanthebairns said:
13aines said:
Can anyone guess? (Steve B you're not allowed to answer
)
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.
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
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