student project : optimization of crank shaft mechanism · 2014-09-22 · student project :...

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Student Project : Optimization of

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Student Project : Optimization of crank shaft mechanism

• Model set up

• Simulation rigid model

• Rod flexibility

• Simulation of flexible model

• Export of the static load

• Topology optimization on rod

• Simulation of flexible model with the new design of the rod

• ELSM optimization

Content

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Fixed joint between sleeve and ground body

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Translational joint between sleeve and piston with axis from “conrod_feet” point to “translational_axis” point

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Revolute joint between piston and rod with X global axis and “conrod_feet” point center

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Fixed joint between rod and disks_and_ring

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Revolute joint between rod and crankshaft with X global axis and “conrod_head” point center

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• Revolute joint between crankshaft and attachment with X global axis and “p_attachment_cg” point center.

• The input velocity is on this joint: 136.136 rad/s

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Fixed joint between attach and ground body

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Force History on the rod.

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Force History :

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Rod as Flexbodies

– Craig-Bampton method

– 2 boundary nodes: 1 for piston connection and another for crankshaft connection

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Force History on the Rod

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Identification times steps where the maximum stress obtained:

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Use of the Export Load feature in order to obtain the static load for the topology optimization

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• Minimize mass • Stress constraint • Extrusion

constraint • DS • NDS

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Interpretation :

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Stress History :

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• 6 shapes variables

• Minimize mass

• Stress constraint

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Before/after optimization comparison :

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student project : optimization of crank shaft mechanism · 2014-09-22 · student project :...

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