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.
Can you not put something on the opposite jacks (like a heavier bike?) and strap the bike to it leaning it away from it then have both sets of jacks in sync so the lean angle never changes if that makes sense?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
hebegb said:
Digging photos out for Soofsayer , tripped over an Anglesey shot from early this year too, an Alex James shot - he is certainly one of the best photo boys out there and I like his " arty farty" effects....
This pic makes me absolutely ache for dry, sunny, warm riding conditions - role on Jerez just two long months to go ...just got a bike to rip apart from "road" to "track" ....probably for the last time as I've bought an FZ1 for the road now for next year
Anglesey is mint, love that hairpin too, well all of it actually. Need to get me a trackbike sorted for 2016!!!
StuB said:
Great shot, Alex is a top guy, supporting NL this year.
Anglesey is mint, love that hairpin too, well all of it actually. Need to get me a trackbike sorted for 2016!!!
He is Stu , and you certainly must - a few of us are hoping you get out there to show us a few things , would be great if you do , maybe rope you into a little event or two as we shall have an odd number to make up two twos / a three here and there ....??!! Anglesey is mint, love that hairpin too, well all of it actually. Need to get me a trackbike sorted for 2016!!!
rossb said:
996 sps said:
New edition to the garage - Run it in today 
Cool - I collected my crf250x on friday night - rode it on saturday - taking a day off to take it green laning tomorrow. most fun you can have with your clothes on at this time of year - new one must be awesome - mines 2004 modelChees for comments all...
Fats25 said:
Yesterday was an early start.
A load of Street Glide goodness.
Cracking shots and bike. I've driven across that region and for your viewing pleasure, there now follows a list of all the places I would not ride a bike:A load of Street Glide goodness.
1) UAE
2) Oman
3) From UAE to Oman
f
k. That. I'd have taken the Camaro
Went to fireup listen to my RD500 at the dealers today, he has some real nice and rare stuff in the showroom.
MVX250, predecessor to the NS400, 3 cyclinder 250, funny looking bike but very well built.
Some very cool and tiny Ducatis.
Mint FZ600 next to gorgeous OW01.
The 500, sounded bloody good...Ive sold my TZR250 now, aim is to get the 500 home first week of Jan.
MVX250, predecessor to the NS400, 3 cyclinder 250, funny looking bike but very well built.
Some very cool and tiny Ducatis.
Mint FZ600 next to gorgeous OW01.
The 500, sounded bloody good...Ive sold my TZR250 now, aim is to get the 500 home first week of Jan.
3DP said:
podman said:
Biker's Nemesis said:
You'll love that 500 Podman.
I think im in love already mate.,you know, thinking about "her" last thing at night, first thing in the morning...all the signs are there 
podman said:
3DP said:
podman said:
Biker's Nemesis said:
You'll love that 500 Podman.
I think im in love already mate.,you know, thinking about "her" last thing at night, first thing in the morning...all the signs are there Gassing Station | Biker Banter | Top of Page | What's New | My Stuff