MBSIM – Parameters for Multi-body Simulation
Defines the parameters for a multi-body simulation.
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MBSIM |
ID |
TYPE |
TTYPE |
TIME |
STYPE |
DELTA/NSTEPS |
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ITYPE |
DTOL |
H0 |
HMAX |
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or
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KETOL/ |
DQTOL/ |
NITER |
TLIMIT |
ALIMIT |
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MBSIM |
99 |
TRAN |
END |
5.0 |
NSTEPS |
250 |
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VSTIFF |
0.001 |
0.001 |
0.01 |
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MBSIM |
91 |
STAT |
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1.0e-6 |
0.0001 |
100 |
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Field |
Contents |
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ID |
Unique identification number. (Integer > 0) |
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TYPE |
Simulation type. No default |
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TTYPE |
Termination type. No default |
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TIME |
Termination time or duration based on TTYPE. (Real > 0.0) – see comment 2. |
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STYPE |
Output step type. No default |
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DELTA |
Output time step. (Real > 0.0) – see comments 2 and 3. |
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NSTEPS |
Maximum number of time steps. (Integer > 0) – see comments 2 and 3. |
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ITYPE |
Integrator type. (Default = VSTIFF) |
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DTOL |
Integrator tolerance. (Default = 0.001, Real > 0.0) – see comment 4. |
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H0 |
Initial time step for the integrator. (Real > 0.0, Default = 1e-8) – see comment 4. |
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HMAX |
Max step size the integrator is allowed to take. (Real > 0.0, Default = 0.01) – see comment 4. |
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KETOL |
Maximum residual kinetic energy tolerance. (Real > 0.0, Default = 1.0e-5) – see comment 5. |
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RESTOL |
Maximum residual tolerance for force imbalance method. (Real > 0.0, Default = 1.0e-4) – see comment 6. |
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DQTOL |
Maximum coordinate difference tolerance. (Real > 0.0, Default = 0.001) – see comment 5. |
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FITOL |
Maximum force imbalance tolerance. (Real > 0.0, Default = 0.001) – see comment 6. |
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NITER |
Max number of iterations for static solution to converge. (Integer > 1, Default = 50) – see comment 5. |
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TLIMIT |
Max translational limit for force imbalance static solution. (Real > 1, Default = 10000) – see comment 6. |
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ALIMIT |
Max angular limit for force imbalance static solution. (Real > 1, Default = 30) – see comment 6. |
Comments
The continuation card is used to distinguish between either a TRANS or STAT simulation type. The reader will look for appropriate options based on the type of simulation specified.
When the simulation type is static (STAT), the solver will perform a static simulation if the termination type, termination time/duration, step type, delta/nsteps are not provided. A quasi-static simulation will be performed if that information is provided.
If the output step type is DELTA, then the next argument is expected to be a positive real value, and it is the output step time during the simulation run. If the step type is NSTEPS, then the next argument is expected to be a positive integer value which will be the number of output steps during the simulation.
ITYPE, DTOL, H0, HMAX are only applicable for TRANS simulation types.
KETOL, DQTOL, NITER are only applicable for STATIC simulation type.
RESTOL, FITOL, NITER, TLIMIT, ALIMIT are applicable for the force imbalance static method used for quasi-static solutions.
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