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+ADw-div class+AD0AIg-content+ACIAPg-Hi, I've started using pacejka's magic formulae in my sim, but one of the +ADw-br+AD4- +ACo-MANY+ACo- of my problems +ADw-br+AD4- is that my pacejka lateral force equation returns a fairly large (about +ADw-br+AD4- 100N) force when the slip +ADw-br+AD4- angle is zero, so when my car is standing still it starts to rotate+ACE- +ADw-br+AD4- +ADw-p+AD4-I've checked the ceofficients with Racer's pacejka player, and I think they +ADw-br+AD4- are right, but +ADw-br+AD4- I have noticed Racer's cars do not turn on the spot as mine does+ACE- So its +ADw-br+AD4- obviously a fault at +ADw-br+AD4- my end somewhere, but i've compared my calculation of lateral force with +ADw-br+AD4- racer's and it appears +ADw-br+AD4- no different. +ADw-br+AD4- +ADw-p+AD4-Any ideas grateful+ACE- +ADw-br+AD4- +ADw-p+AD4-Then there's the angular acceleration of the wheels......aaAAAaargh+ACE- That +ADw-br+AD4- can be a different post +ADw-br+AD4APA-/div+AD4-
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+ACY-nbsp+ADs- That's odd. +ACY-nbsp+ADs-Mine actually switches between90 degrees when it's standing +ADw-br+AD4- still, making some really big forces, but they switch so quickly and the forces +ADw-br+AD4- usually are fighting each other pretty effectively, so the car doesn't move... +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- I'd check first to make sure the forces are going the right way (easy +ADw-br+AD4- mistake). +ACY-nbsp+ADs-Obviously if you've been driving it around and it runs fine already, +ADw-br+AD4- then that's probably not the problem.. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs-If you can, run it in super slow motion (every integration step) and have the +ADw-br+AD4- forces displayed in another window or in the 3-D view so you can watch what's +ADw-br+AD4- happening. +ACY-nbsp+ADs-Better yet, draw the force vectors coming off the wheels. +ACY-nbsp+ADs-I've +ADw-br+AD4- found and fixed a LOT of problems that way :-) +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs-You might need to get rid of the vertical offset in that data. +ACY-nbsp+ADs-Unfortunately, +ADw-br+AD4- I don't know which Pacejka constant(s) do it. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADsAJg-gt+ADs-Then there's the angular acceleration of the wheels......aaAAAaargh+ACE- That +ADw-br+AD4- +ADw-p+AD4-
+ACY-nbsp+ADs-Hehe.. +ACY-nbsp+ADs-It can be MANY posts... +ADw-br+AD4- +ADw-p+AD4-Todd Wasson +ADw-br+AD4- --- +ADw-br+AD4- Performance Simulations +ADw-br+AD4- Drag Racing and Top Speed Prediction +ADw-br+AD4- Software +ADw-br+AD4- http://PerformanceSimulations.Com +ADw-br+AD4- +ADw-p+AD4-My little car sim screenshots: +ADw-br+AD4- http://performancesimulations.com/scnshot4.htm +ADw-br+AD4APA-/div+AD4-
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Hi Alex, +ADw-br+AD4- +ADw-p+AD4-Ah this a question I asked quite a long time ago, but I still dont see an +ADw-br+AD4- answer. +ACY-nbsp+ADs-What Ruud (i think) and I have down is simply ignore this part of +ADw-br+AD4- the pacekja equation. +ACY-nbsp+ADs-From memory I think you just remove the from the +ADw-br+AD4- equation. +ADw-br+AD4- +ADw-p+AD4-What Sh gives you (actually it may be Sv?) is the force that is generated in +ADw-br+AD4- the tyre from ply steer and conicity, I am pretty sure that this should be +ADw-br+AD4- dependent on velocity. +ACY-nbsp+ADs- If you find a satisfactory answer to this I would +ADw-br+AD4- be very interested in hearing it+ACE- +ADw-br+AD4- +ADw-p+AD4-Hope this helps a little +ADw-br+AD4- All the best, +ADw-br+AD4- Ash +ADw-br+AD4- http://www.siroccoracing.com +ADw-br+AD4APA-/div+AD4-
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+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Gregor Vebl+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sat, 06 Apr 2002 00:59:38+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-Hi Ash+ACE- +ADw-br+AD4- +ADw-p+AD4-This is all a problem with the low speed behaviour where the slip angle +ADw-br+AD4- and ratio aren't well defined. +ADw-br+AD4- +ADw-p+AD4-If you use the relaxation length approach towards calculating slip angle +ADw-br+AD4- and ratio, a 'slip angle' will develop automatically through dynamics that +ADw-br+AD4- will offset the conicity effect when the car is standing still (as it +ADw-br+AD4- would all other lateral forces like standing on the hill). +ADw-br+AD4- +ADw-p+AD4--Gregor +ADw-br+AD4- +ADw-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- Hi Alex, +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- Ah this a question I asked quite a long time ago, but I still dont see an +ADw-br+AD4- +ACY-gt+ADs- answer. +ACY-nbsp+ADs-What Ruud (i think) and I have down is simply ignore this part of +ADw-br+AD4- +ACY-gt+ADs- the pacekja equation. +ACY-nbsp+ADs-From memory I think you just remove the from the +ADw-br+AD4- +ACY-gt+ADs- equation. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- What Sh gives you (actually it may be Sv?) is the force that is generated in +ADw-br+AD4- +ACY-gt+ADs- the tyre from ply steer and conicity, I am pretty sure that this should be +ADw-br+AD4- +ACY-gt+ADs- dependent on velocity. +ACY-nbsp+ADs- If you find a satisfactory answer to this I would +ADw-br+AD4- +ACY-gt+ADs- be very interested in hearing it+ACE- +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- Hope this helps a little +ADw-br+AD4- +ACY-gt+ADs- All the best, +ADw-br+AD4- +ACY-gt+ADs- Ash +ADw-br+AD4- +ACY-gt+ADs- http://www.siroccoracing.com +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4APA-/div+AD4-
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+ADw-div class+AD0AIg-content+ACIAPg-Aaaaaahaaaa, +ADw-br+AD4- +ADw-p+AD4AKgAq-penny dropping+ACoAKg- +ADw-br+AD4- +ADw-p+AD4-Ash +ADw-br+AD4- http://www.siroccoracing.com +ADw-br+AD4- +ADw-p+AD4-
+ADw-br+AD4- +ADw-div class+AD0AIg-gQuote+ACIAPgAm-gt+ADs- Hi Ash+ACE- +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- This is all a problem with the low speed behaviour where the slip angle +ADw-br+AD4- +ACY-gt+ADs- and ratio aren't well defined. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- If you use the relaxation length approach towards calculating slip angle +ADw-br+AD4- +ACY-gt+ADs- and ratio, a 'slip angle' will develop automatically through dynamics that +ADw-br+AD4- +ACY-gt+ADs- will offset the conicity effect when the car is standing still (as it +ADw-br+AD4- +ACY-gt+ADs- would all other lateral forces like standing on the hill). +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- -Gregor +ADw-br+AD4- +ADw-p+AD4-
+ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- Hi Alex, +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- Ah this a question I asked quite a long time ago, but I still dont see +ADw-br+AD4- an +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- answer. +ACY-nbsp+ADs-What Ruud (i think) and I have down is simply ignore this part +ADw-br+AD4- of +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- the pacekja equation. +ACY-nbsp+ADs-From memory I think you just remove the from +ADw-br+AD4- the +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- equation. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- What Sh gives you (actually it may be Sv?) is the force that is +ADw-br+AD4- generated in +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- the tyre from ply steer and conicity, I am pretty sure that this should +ADw-br+AD4- be +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- dependent on velocity. +ACY-nbsp+ADs- If you find a satisfactory answer to this I +ADw-br+AD4- would +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- be very interested in hearing it+ACE- +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- Hope this helps a little +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- All the best, +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- Ash +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- http://www.siroccoracing.com +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4APA-/div+AD4-
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+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p6+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-J. Todd Wass+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sat, 06 Apr 2002 01:45:11+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4-
+ACY-nbsp+ADs-Also useful to handle camber thrust when stationary, no doubt... :0) +ADw-br+AD4- +ADw-p+AD4-Todd Wasson +ADw-br+AD4- --- +ADw-br+AD4- Performance Simulations +ADw-br+AD4- Drag Racing and Top Speed Prediction +ADw-br+AD4- Software +ADw-br+AD4- http://PerformanceSimulations.Com +ADw-br+AD4- +ADw-p+AD4-My little car sim screenshots: +ADw-br+AD4- http://performancesimulations.com/scnshot4.htm +ADw-br+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p7+ACI- class+AD0AIg-post has-profile bg2+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile7+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Jim Seamu+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content7+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p7+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Jim Seamu+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sat, 06 Apr 2002 02:30:10+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4-
+ADw-br+AD4- +ACY-lt+ADs-snip+ACY-gt+ADs- +ADw-br+AD4-
+ACY-lt+ADs-snip+ACY-gt+ADs- +ADw-br+AD4- +ADw-p+AD4-Actually, many of them do. It's very very slow, but noticeable... park your +ADw-br+AD4- car, go watch some TV, and come back to find you've rotated 30 degrees or +ADw-br+AD4- so. Doesn't affect all cars. +ADw-br+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p8+ACI- class+AD0AIg-post has-profile bg1+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile8+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Alex Smit+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content8+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p8+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Alex Smit+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sat, 06 Apr 2002 21:53:56+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-What is the relaxation length approach? +ADw-br+AD4- Is it in Genta or Milliken? +ADw-br+AD4- +ADw-p+AD4-
+ADw-br+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p9+ACI- class+AD0AIg-post has-profile bg2+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile9+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Ashley McConnel+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content9+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p9+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Ashley McConnel+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sat, 06 Apr 2002 22:13:48+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-Neither, its in a SAE paper.+ACY-quot+ADs-Tire Modelling for Low-Speed and High-Speed +ADw-br+AD4- Calculations+ACY-quot+ADs- +ADw-br+AD4- +ADw-p+AD4-All the best, +ADw-br+AD4- Ash +ADw-br+AD4- http://www.siroccoracing.com +ADw-br+AD4- +ADw-p+AD4-
+ADw-br+AD4- +ADw-div class+AD0AIg-gQuote+ACIAPgAm-gt+ADs- What is the relaxation length approach? +ADw-br+AD4- +ACY-gt+ADs- Is it in Genta or Milliken? +ADw-br+AD4- +ADw-p+AD4-
+ADw-br+AD4-
+ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- Hi Ash+ACE- +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- This is all a problem with the low speed behaviour where the slip angle +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- and ratio aren't well defined. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- If you use the relaxation length approach towards calculating slip angle +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- and ratio, a 'slip angle' will develop automatically through dynamics +ADw-br+AD4- that +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- will offset the conicity effect when the car is standing still (as it +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- would all other lateral forces like standing on the hill). +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p10+ACI- class+AD0AIg-post has-profile bg1+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile10+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Ruud van Ga+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content10+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p10+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Ruud van Ga+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sat, 06 Apr 2002 22:46:10+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-
+ADw-br+AD4- +ADw-p+AD4-
Yikes+ACE- Hope that is true+ADs- my inclusion of camber meant nothing but +ADw-br+AD4- trouble with cars slamming to the side. +ADs--) +ADw-br+AD4- +ADw-p+AD4-As for Racer, it indeed has the jittery 'lateral forces bang back +ACY-amp+ADs- +ADw-br+AD4- forth all the time' effect at low speed (which is why the conicity +ADw-br+AD4- forces don't really hurt). The latest beta (which does have a lot of +ADw-br+AD4- huge camber problems) has a G-force indicator+ADs- the longitudinal +ADw-br+AD4- version is steady enough but the lateral G-forces just go crazy when +ADw-br+AD4- you're standing still. +ADw-br+AD4- +ADw-p+AD4-Hopefully indeed, Barnard's SAE950311 will clear this up (relaxation +ADw-br+AD4- lengths). I'll wait for that till I get Pacejka's book on Tyre +ADw-br+AD4- Physics+ADs- you never know what nice tire models are in there (or a more +ADw-br+AD4- elaborate description of the Magic Formula, such us in what units you +ADw-br+AD4- must input camber). +ADw-br+AD4- +ADw-p+AD4-Ruud van Gaal +ADw-br+AD4- Free car sim: http://www.racer.nl/ +ADw-br+AD4- Pencil art +ACY-nbsp+ADs-: http://www.marketgraph.nl/gallery/ +ADw-br+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p11+ACI- class+AD0AIg-post has-profile bg2+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile11+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Ruud van Ga+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content11+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p11+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Ruud van Ga+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sat, 06 Apr 2002 22:47:46+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-On Thu, 4 Apr 2002 18:30:10 +010-, +ACY-quot+ADs-Jim Seamus+ACY-quot+ADs- +ADw-br+AD4- +ADw-p+AD4APA-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4- +ADw-p+AD4-
+ADw-br+AD4-
+ADw-br+AD4- +ACY-gt+ADsAJg-lt+ADs-snip+ACY-gt+ADs- +ADw-br+AD4- +ACY-gt+ADsAJg-gt+ADs- I have noticed Racer's cars do not turn on the spot as mine does+ACE- So its +ADw-br+AD4- +ACY-gt+ADsAJg-lt+ADs-snip+ACY-gt+ADs- +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs-Actually, many of them do. It's very very slow, but noticeable... park your +ADw-br+AD4- +ACY-gt+ADs-car, go watch some TV, and come back to find you've rotated 30 degrees or +ADw-br+AD4- +ACY-gt+ADs-so. Doesn't affect all cars. +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4-Hehe, ok. Try downgrading the sim frequency (increase debug.ini's +ADw-br+AD4- timing.integration+AF8-time) and the problem gets worse. +ADw-br+AD4- +ADw-p+AD4-Never EVER park your car in Racer and go out for lunch+ACE- +ADs--) +ADw-br+AD4- +ADw-p+AD4-Ruud van Gaal +ADw-br+AD4- Free car sim: http://www.racer.nl/ +ADw-br+AD4- Pencil art +ACY-nbsp+ADs-: http://www.marketgraph.nl/gallery/ +ADw-br+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p12+ACI- class+AD0AIg-post has-profile bg1+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile12+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Ruud van Ga+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content12+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p12+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Ruud van Ga+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sun, 07 Apr 2002 00:18:04+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-On Fri, 5 Apr 2002 12:53:56 +000- (UTC), +ACY-quot+ADs-Alex Smith+ACY-quot+ADs- +ADw-br+AD4- +ADw-p+AD4APA-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4- +ACY-gt+ADs-What is the relaxation length approach? +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4-Instead of directly calculating slipAngle, you make it a variable and +ADw-br+AD4- update that. Makes the variable vary more smoothly based on the +ADw-br+AD4- turning speed of the wheel. +ADw-br+AD4- +ADw-p+AD4-
No, as Ash said, it's in an SAE paper, 950311. +ADw-br+AD4- It's also mentioned, though very quickly, in: +ADw-br+AD4- +ADw-p+AD4-http://www.lib.ncsu.edu/etd/public/etd-373202299842941/etd.pdf +ADw-br+AD4- +ADw-p+AD4-(a thesis from Erik Lowndes). +ADw-br+AD4- +ADw-p+AD4-Ruud van Gaal +ADw-br+AD4- Free car sim: http://www.racer.nl/ +ADw-br+AD4- Pencil art +ACY-nbsp+ADs-: http://www.marketgraph.nl/gallery/ +ADw-br+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p13+ACI- class+AD0AIg-post has-profile bg2+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile13+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Gregor Vebl+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content13+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p13+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Gregor Vebl+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sun, 07 Apr 2002 00:52:11+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4APA-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- Never EVER park your car in Racer and go out for lunch+ACE- +ADs--) +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4-Or in any Italian city for that matter (can easily cost you the radio). +ADw-br+AD4- +ADw-p+AD4AOw-) +ADw-br+AD4- +ADw-p+AD4--Gregor +ADw-br+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p14+ACI- class+AD0AIg-post has-profile bg1+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile14+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Gregor Vebl+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content14+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p14+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Gregor Vebl+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sun, 07 Apr 2002 00:53:32+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4APA-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4-
+ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- Yikes+ACE- Hope that is true+ADs- my inclusion of camber meant nothing but +ADw-br+AD4- +ACY-gt+ADs- trouble with cars slamming to the side. +ADs--) +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4-Helps with camber thrust as well, naturally :). +ADw-br+AD4- +ADw-p+AD4--Gregor +ADw-br+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div id+AD0AIg-p15+ACI- class+AD0AIg-post has-profile bg2+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-dl class+AD0AIg-postprofile+ACI- id+AD0AIg-profile15+ACIAPg-
+ADw-dt class+AD0AIg-has-profile-rank no-avatar+ACIAPg-
+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Alex Smit+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content15+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p15+ACIAPg-Pacejka probs+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Alex Smit+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Sun, 07 Apr 2002 02:16:32+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4-Thanks for the help guys+ACE- +ADw-br+AD4- +ADw-p+AD4-Although I haven't really progressed with it yet, the discussion is most +ADw-br+AD4- appreciated+ACE- +ADw-br+AD4- And its also nice to know I'm not alone with finding it difficult, no - near +ADw-br+AD4- impossible :) +ADw-br+AD4- +ADw-p+AD4-Alex +ADw-br+AD4APA-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-hr /+AD4-
+ADw-div class+AD0AIg-action-bar bottom+ACIAPg-
+ADw-div class+AD0AIg-pagination+ACIAPg-
+ADw-ul+AD4- +ADw-li class+AD0AIg-pageleft+ACIAPg-Page:+ADw-/li+AD4APA-li+AD4APA-a href+AD0AIg-8+AF8-a9554cc04dbfdc69+AF8-1.html+ACI- role+AD0AIg-button+ACIAPg-1+ADw-/a+AD4APA-/li+AD4- +ADw-li+AD4APA-a href+AD0AIg-8+AF8-a9554cc04dbfdc69+AF8-2.html+ACI- role+AD0AIg-button+ACIAPg-2+ADw-/a+AD4APA-/li+AD4- +ADw-/ul+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-/div+AD4-
+ADw-div class+AD0AIg-navbar+ACIAPg-
+ADw-div class+AD0AIg-inner+ACIAPg-
+ADw-br/+AD4-
+ADw-p+AD4-1. +ADw-a href+AD0AIg-8+AF8-ca4cbdb13431f6d6+AF8-1.html+ACIAPg-Car Physics : Pacejka Formula+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-2. +ADw-a href+AD0AIg-8+AF8-b6a11aa348ee19e7+AF8-1.html+ACIAPg-Car physics+ADs- Pacejka and friction coefficients+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-3. +ADw-a href+AD0AIg-8+AF8-eb734eee8c37b933+AF8-1.html+ACIAPg-Car Physics: Slip Angle and the Pacejka magic formula+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-4. +ADw-a href+AD0AIg-8+AF8-f71972ac62642fd8+AF8-1.html+ACIAPg-Racer+ADs- beta Pacejka editor released+ADw-/a+AD4APA-/p+AD4-
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