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Rahul Ponginan

Evaluation of Barrier Load Cells with HyperGraph/HyperView

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Hello

Introduction/Motivation:
Recently many test approaches have been developed for evaluation of frontal impact crash compatibility. One of the most important parts of these approaches is a load cell wall, which measures the forces behind a barrier. The load cell wall's measurements could be processed to analyze structural interaction of the test vehicle and homogenity of force spreading in the barrier. So we can evaluate the crash compatibility of a vehicle.

Goal/Problem
I have some load measerments in *.abf (an example can be downloaded from NHTSAchange the format to ABF on Top-Right). I want to produce a contour plot from that. i.e. a 3D-Diagram with (x and Y Position of the Load cell and its force value), which changes during the time. So I can detect the load spreading on the barrier during the collision (both images are from a presentation).
33uo8-Contour_Plot_3D.PNG
if995-Contour_Plot_2D.PNG

Approach?
I think I should create a model (LS-Dyna) for the load cell wall, which has the same cell number as the results. Then I should transfer the results to the load cells (e.g. as element outputs). But how can I define it in HyperView, that some results (e.g. force values of Load cell 0105, which exists as a Force-Time diagram) belongs to an element in the model?

I thank you in advance for your tipps.

Best regards
Emad

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Hi Emad,

The best solution for this could be using the generic ascii reader of HyperView,

Let me explain this in a simple way with an example,

Firstly as you say you will need to generate the model file with the model information such as node and element data so that you can first read in the model file (the blank mesh without results)

5h0ev-fyiu.JPG

Then you will need to create a hwascii file with the element id and the result data,

ca84f-vjt.JPG

You can load in the model info from dyna as you say or really any supported solver format eg the *.inp or *.bdf or even .dat etc in the load model file area and then load in a hwascii file in the load result file area. This would allow you to contour the results in the hwascii file onto the element.

828f3-zc.JPG

A generic ASCII reader is available which allows you to bring custom results directly into HyperView. The Altair ASCII format is useful for reading the results of any in-house or propriety codes which are saved in a generic format. This flexible format supports multiple data types (scalars, vectors, and tensors) spanning across various simulation types (linear, modal, and transient), and allows user defined labels for the data types.

Read about how to create them and find examples etc in the help documentation following the navigation below,
HyperWorks Desktop Reference Guides Overview > HyperWorks Desktop Reference Guide:
Generic ASCII Reader

Rahul R likes this

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Hey, 

 

I'm interrested by writing a .hwascii document to import some results in HyperView. 

But i can't find any documentation about how to write nodes displacement or nodes stress or anything. 

 

Do you have any recommandation to start using this format ? 

 

Hugo

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