transient analysis with pre-stress

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Lenhart posted this 31 March 2018

Hello everyone, 

I want to perform some dynamic analysis of rotating blade. But when I try to do the transient analysis after the static-mechanical analysis under the centrifugal stress field, an error occurs and reminds me that the transient analysis is not allowed. 

Does anyone conduct the analysis in the same area, an agent guide is needed. 

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peteroznewman posted this 31 March 2018

Please take a screen snapshot of the error message. For detailed help you could use File, Archive... in Workbench and attach the resulting .wbpz file to your reply.  Please reply with the version of ANSYS you are using (18.2, 19.0).

Here is my pre-stressed, modal superposition, transient analysis. Is this how your are approaching the analysis?

Attached is an ANSYS 19.0 archive if you want to see it in more detail.

I can tell the rotational velocity pre-stress is working since Mode 1 is at 81 Hz and Mode 2 is at 83 Hz. Without the rotor velocity, they would be equal. The transient disturbance is a 100 ms duration, 10 G vertical acceleration.

Attached Files

Punnag Chatterjee posted this 3 days ago

Hello,

Is it possible to go from Static structural to Transient structural skipping Modal? If I am dealing with large deflection (geometric nonlinearity) pre-stressed anslysis then using Modal as an intermediate step blocks large deflection analysis. Any idea with that?

So, with applied tension (Static structural), my mode shape changes for a clamped-clamped beam (with PZT patched at clamped ends). I want to use the information of the changed mode shape to run geometric nonlinear (large deflection) Transient analysis. I am not sure how I can achieve this, any thoughts/pointers?

 

peteroznewman posted this 4 hours ago

Hello,

Use a two step Transient model. In step 1, you apply the load that prestresses the PZT patches, then in step 2, you apply the transient load.

Regards, Peter

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