bicycle crank arm topology optimization tutorials.pdf

8/10/2019 Bicycle Crank Arm Topology Optimization Tutorials.pdf

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1Basic coursehttp://www.midasnfx.com

00

Bicycle Crank Arm Topology Optimization Tutorial

Fixed Position

Load Position


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Chapter 2Bicycle Crank Arm

The direction of the load acting on the crank pedal of a bicycle changes with time.

What is the optimal design considering the material costs of the arm?

Target Volume Reduction: 20%

00

Rotational Position Rotational Position

Load Direction

Two kinds of loads are applied at the same time.

What is the optimal design for the load acting on different

positions of the crank arm?

What are the material costs associated with each of

those designs?

Objective

Load Direction


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Step

Phase optimized structures of various load set being considered sequentially

- Optimization Analysis Considering the set of all loads if the loads are applied sequentially the learning process.

- Understand how to v iew the results of the interpretation, and learning about the principles of interpretation.

Target Model

01

Y

XZ

Fixed Position

Load Position

Fixed boundary

conditions

connections fixedLoad conditions

100N, X-axis

direction (Y

direction 50N)

Summary

Objectives of Tutorial

StSt St


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StepStepStep

Step

00 Geometry > CAD File >Import

1

StSt St


5/135Basic coursehttp://www.midasnfx.com

StepStepStepStep

01

Use the default material, i.e., 'Alloy Steel' to assign to the property.

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3

2

Mesh > Attribute >Property

StepStepStep



StepStepStepStep

02

Set the element size to '5'.

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2

3

4

Mesh > Generate >3D

StepStepStep

St



StepStepStepStep

03

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2

3

4

5

6

Static/Heat Analysis > Boundary >Constraint

StepStepStep

Step



StepStepStepStep

04

The rigid link will be created in the center of the hole of the crank arm. The load can be applied to the rigid link.

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2

3

4

5

6

7

8

Choose circular

selection to select

the nodes.

Node Selection

Mesh > Element >Create

StepStepStep

Step



StepStepStepStep

05

Apply the load of 50N in the X direction and 100N in the Y direction.

1

Choose rectangular

selection

2

3

5

6

4

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8

Specify Individual

Load Set

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11

12

13

Y

XZ

Mesh > Element >Create

StepStepStep

Step



StepStepStepStep

Create an extra subcase as there are two subcases required - each for the loads acting on X-Axis and Y-Axis. The boundary conditions

shall be the same for both analysis.

06

23

4

Additional sub-cases

generated

Subcase

Subcase

5

6

Analysis & Results > Analysis Case >Optimize

1 8

StepStepStep

Step



SteppStepStep

Create an extra subcase as there are two subcases required - each for the loads acting on X-Axis and Y-Axis. The boundary conditions

shall be the same for both analysis.

07

1 2

3

4

Target Volume (%) : 20%

Analysis & Results > Analysis Case >Optimize

StepStepStep

Step



pp pStep

Optimized material density of using subcase is created in the first subcase.

08

Topology Optimization Results

1

Analysis & Results Works Tree> Bicycle Crank >X-Force

StepStepStep

Step



pp pp

Reference

1) Considering individual loads on X-axis and Y-axis

2) Considering the sequential loads on X and Y axes

3) X-axis and Y-axis loads are considered sequentially, along with the results of the symmetry condition (symmetric) upper and lower

surfaces

09Topology Optimization ResultsAnalysis ConditionsNo.

1)-1

1)-2

2)

3)

Only X-axis loads

considered

Only Y-axis loads

considered

2) + Symmetrycondition

Considered as a

sequential X-axis,

Y-axis load

bicycle crank arm topology optimization tutorials.pdf

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