How can I observe the coriolis force on a mass moving radially on a spring?
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In the following simple example a single beam element which is very stiff in bending, but very soft axially is used to produce a 500 #/in spring. There is a unit mass at the end of the beam. The beam rotates around the i node 5 radians in 5 seconds. To get the radial motion the beam is given an initial unit axial extension. The shear force in the beam at node j is the coriolis force. fini /clear /prep7 et,1,3 r,1,.01,100,10 mp,ex,1,1e6 mp,nuxy,1,.3 et,2,21,,,2 r,2,1 ! unit mass n,1 n,2,20 e,1,2 type,2 real,2 e,2 fini /solu antype,trans nlgeom,on d,1,ux d,1,uy kbc,0 ! ramped load d,1,rotz,5 ! 5 radians ic,2,ux,1 ! expand spring to 21 radius ic,2,uy,,21 ! initial tangential velocity to produce 1 radian/sec time,5 nsub,200 outres,all,1 save solve fini /post26 esol,2,1,,smisc,8 plva,2 |
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