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September 22, 2016, 19:12 |
6DOF for moving piston
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Member
alliche redha
Join Date: Jun 2010
Posts: 53
Rep Power: 15 |
hello everybody;
i have a problem with 6DOF. Imagine a cylinder closed by a piston mass (eg 1 kg) and filled with a gas (eg air) . if I let the piston, it will move down. and it stops if: the piston weight (p = m.g ) = pressing force ( pressure force = pressure. area) here is the UDF that I use : #include "udf.h" #include "math.h" DEFINE_SDOF_PROPERTIES(mass_6dof, prop, dt, time, dtime) { prop[SDOF_MASS] = 1; prop[SDOF_ZERO_TRANS_X] = TRUE; prop[SDOF_ZERO_TRANS_Y] = FALSE; prop[SDOF_ZERO_TRANS_Z] = TRUE; prop[SDOF_ZERO_ROT_X] = TRUE; prop[SDOF_ZERO_ROT_Y] = TRUE; prop[SDOF_ZERO_ROT_Z] = TRUE; prop[SDOF_LOAD_F_Y] = -9.81*1; } the problem is that the piston does not stop the real case : my case: thank you in advance |
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