Changes between Initial Version and Version 1 of Ticket #2391, comment 13


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Timestamp:
2015-12-10T19:26:01Z (9 years ago)
Author:
massimo ceraolo

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  • Ticket #2391, comment 13

    initial v1  
    66AFAIK an Inertia component will have zero acceleration only when the sum of the applied torques is zero (Newton's second law).
    77I cannot imagine the effect of explicitly stating an initial acceleration a=0: if torques sum up to zero it is superfluous, otherwise it creates a conflicting condition.
     8
     9Naturally in a system, say dx/dt=f(x,u), the steady-state is imposed setting to zero dx/dt, i.e. the derivatives of all the state variables.
     10But I cannot envisage how this can be exploited in Modelica, except for special cases (in which initial conditions to derivatives can be set trough direct writing on code).
     11BTW, if we wanted to offer users the possibility to zero the derivatives of state variables, we, for instance had to show in dialogs also the check-boxes to set initial values for voltage of inductors and current of capacitors!