PS Divide, Accelaration, Feedback

Hello.

I´m trying to to build a model with simscape of an ASM. Instant of an constant of an Torqueload I want maki it as an feedback. For this I need to calculate the accaleration and devide it bei inertia. The problem is, when I´m using the PS Diviede-Block I get the error message:

An error occurred while running the simulation and the simulation was terminated

Caused by:

• ['AC_Phys/Solver Configuration']: At time 0.000000, one or more assertions are triggered. See causes for specific information.
• In divide, the denominator must be nonzero. The assertion comes from: Block path: AC_Phys/PS DivideAssert location: o In between line: 21, column: 15 and line: 21, column: 17 in file: C:\Program Files\MATLAB\R2018b\toolbox\physmod\simscape\library\m\+foundation\+physical_signal\+functions\divide.ssc

I´m using the equasions:

a = angular accelaration

s = angular displacement = A

w = angular velocity = W

a = w^2/s and then Torque = J * a

Anyone whocould tell where the mistake is or are there alternatives to this?

Thx

The equ

Answer 1

[Martin]

Hello Vitali,

It is possible that the rotational motion sensor is giving a value of 0 to the PS Divide block. Have you set the initial angle parameter in the sensor to a non-zero value?

Martin