Learning Forum

[ljcish26]

I want to use DOE to find a combination of design variables (Damping coefficient, Offset, Stiffness coefficient) that maintains the stability (convergence) of the model and a constant amplitude.
I created a marker on the axis and created a function expression and set it to PI.

However, when I run DOE, the following error occurs.
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ANSYS MOTION 2024 R1     24.10.31023 (build.fc843c69)      Mon Apr  7 04:09:13 2025 PM

*** ERROR ***                                             Mon Apr  7 04:09:15 2025 PM
AN ERROR OCCURRED WHILE CALLING FUNCTION EXPRESSION (MOTION ERROR)

* exception: access violation reading 0x0000000000000008

* FUNCTION EXPRESSION ID   = 1

* FUNCTION EXPRESSION NAME = /Unb_Nor_250402/FN_002

* FUNCTION EXPRESSION      = SQRT(AX("/Pump_shaft/MK_pump_coup", "/Pump_shaft/CM")^2 + AY("/Pump_shaft/MK_pump_coup", "/Pump_shaft/CM")^2)

* SIMULATION TIME = 0.00000000e+00
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An error occurs when loading the function expression, but the kinematic request of the marker is set as shown in the picture below.

I want to know which part is the problem.
I use ANSYS motion(Standalone) 24R1.

[dev.sarkar]

It seems you have a syntax error. The AX and AY terms need to be in a separate bracke,t and that can be squared.