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Re: [PlayerStage-Gazebo] model for a tank like vehicle
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From: Jordi <mu...@gm...> - 2008-01-09 10:37:38
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If you don't need a perfect simulation, you can make just a physical tank with 2 wheels and a visual mesh with 8 wheels. Maybe tanks has more wheels only because that way they have no single point of attack but all the wheels in one side are moving at the same time what to all practical effects can be managed by differencial wheeling. About the mass effect you comment I have just tried it with a 47000 kilo ball and it is falling though the ground also. It is an ODE problem and it surely can be tweaked, I think that Nate will be able to solve it, stick with 40.000 till then. On Jan 9, 2008 7:23 PM, hemanth korrapati <hem...@gm...> wrote: > Hey thanks for ur help. > > I too dont know whether tanks use differential drive or steering. > But if a tank has 8 wheels how can we use a differential drive? I mean > which wheels use the drive and which are the followers ? > > Also another problem is that I made a small model for the tank for > which i have set the "mass" parameter as 47 tons. When I start the > simulator the robot fall off through the ground. If I reduce the mass > to 40 then it becomes stable. Why is it ? Can we solve it ? > > Thanks > > On Jan 9, 2008 3:39 PM, Jordi <mu...@gm...> wrote: > > > > The controller you are looking for can be found in the patch tracking > > system. It can control any number of wheels, even 8 as steering or > > non-steering roles. > > That code has not been integrated due to a bug in how the steering > wheels > > are managed, I hope it will be solved soon and integrated next week. > > > > Tanks are managed with steering? I'd bet they use a differential drive > > system. > > > > > > > > > > > > On Jan 9, 2008 5:17 PM, hemanth korrapati < hem...@gm...> > > wrote: > > > Hey > > > > > > Thanks for that. > > > But a tank has 8 wheels with equal number of them on both sides.But > > > the controller for pioneer is for a differential drive system which is > > > not the one in a tank. > > > I guess it is difficult to build a controller for a tank. But is there > > > any controller which controls a normal vehicle with four wheels ( > > > front wheels are steered and the back wheels follow). > > > > > > > > > > > > > > > > > > On Jan 8, 2008 11:48 AM, Jordi <mu...@gm...> wrote: > > > > > > > > I know nothing about tanks (luckily) but I guess you can use the > > > > differential_position controller with it (the pioneer example is > using > > it). > > > > About the weight you can search wikipedia. The shape, in your > sources > > > > directory you have a doc/ subdirectory with a mesh_tutorial.html > file in > > it. > > > > There you have some links to free models that can be exported to > Gazebo > > and > > > > instructions. You may be lucky and find a tank (and some other > > insteresting > > > > models). > > > > > > > > > > > > > > > > > > > > On Jan 8, 2008 3:07 PM, hemanth korrapati < > hem...@gm...> > > > > wrote: > > > > > > > > > > > > > > > > > > > > hi > > > > > > > > > > does anybody have a model for a tank like vehicle which simulates > its > > > > > weight,shape,etc.. > > > > > > > > > > > > > > > thanx > > > > > > > > > > > > > ------------------------------------------------------------------------- > > > > > Check out the new SourceForge.net Marketplace. > > > > > It's the best place to buy or sell services for > > > > > just about anything Open Source. > > > > > > > > > > > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > > > > > _______________________________________________ > > > > > Playerstage-gazebo mailing list > > > > > Pla...@li... > > > > > https://lists.sourceforge.net/lists/listinfo/playerstage-gazebo > > > > > > > > > > > > > > > > > > > > > -- > > > > Jordi Polo Carres > > > > Natural language processing laboratory > > > > NAIST > > > > http://www.bahasara.org > > > > > > > > > > > ------------------------------------------------------------------------- > > > > Check out the new SourceForge.net Marketplace. > > > > It's the best place to buy or sell services for > > > > just about anything Open Source. > > > > > > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > > > > _______________________________________________ > > > > Playerstage-gazebo mailing list > > > > Pla...@li... > > > > https://lists.sourceforge.net/lists/listinfo/playerstage-gazebo > > > > > > > > > > > > > > > ------------------------------------------------------------------------- > > > Check out the new SourceForge.net Marketplace. > > > It's the best place to buy or sell services for > > > just about anything Open Source. > > > > > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > > > _______________________________________________ > > > Playerstage-gazebo mailing list > > > Pla...@li... > > > https://lists.sourceforge.net/lists/listinfo/playerstage-gazebo > > > > > > > > > > > -- > > Jordi Polo Carres > > Natural language processing laboratory > > NAIST > > http://www.bahasara.org > > > > > ------------------------------------------------------------------------- > > Check out the new SourceForge.net Marketplace. > > It's the best place to buy or sell services for > > just about anything Open Source. > > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > > _______________________________________________ > > Playerstage-gazebo mailing list > > Pla...@li... > > https://lists.sourceforge.net/lists/listinfo/playerstage-gazebo > > > > > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > _______________________________________________ > Playerstage-gazebo mailing list > Pla...@li... > https://lists.sourceforge.net/lists/listinfo/playerstage-gazebo > -- Jordi Polo Carres Natural language processing laboratory NAIST http://www.bahasara.org |