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How to build a custom expression in the Expression Builder

User: "draucis"
Altair Community Member
Updated by draucis

Hello,

I am using a two-wheeler model in motion view to conducting a stability analysis and in the event editor I have chosen a straight line as the path, the analysis mode is set to general force, under this I want to apply a torque-acting on the steering axis and I want to see the effect on the z-axis of the frame. The torque being applied is sinusoidal with the equation y(t)= A sin(2Pi*f*t). Now I want to give this expression as a value to Rot properties in the Ty tab. But it says error evaluation, where am I going wrong? Do I have to define a custom function and if yes how.  I have attached the expected graph which can give you an idea of what I want.  

Regards 

Draucis

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    User: "AnanthK"
    Altair Employee
    Accepted Answer
    Updated by AnanthK

    Hey there Draucis - you can't specify steering torque and combine that with choosing straight line as the path, because the latter constrains the steering head to have a fixed angle. I would suggest using sinusoidal steer event instead, from looking at your expected graph. All our 2-wheeler vehicle dynamic events currently only support specifying lean angle as an input, from which a steering torque results.