Kursus Matlab di Jakarta Selatan KURSUS MATLAB ONLINE Skripsi, Tesis, DISERTASI 081219449060: KURSUS MATLAB ONLINE Skripsi, Tesis, DISERTASI 081219449060

% SAVE POINT CLOUD AS A COMMA SEPERATED FILE

PC = [ X Z Y ];

dlmwrite('pointcloud.xyz',PC,'delimiter',',','newline','pc');

PC = [ X Y Z ];

PC = [ X Z Y ];

Lecture 19 55

Saving Point Cloud Data to File (2 of 2)

SolidWorks wants to see an X Y Z at the start of the file.

You can add this manually using Notepad or write a more sophisticated MATLAB text file creator.

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Lecture 19 56

Activate ScanTo3D Add-In in SolidWorks

First, you will need to activate the ScanTo3D in SolidWorks.

Click ToolsAdd‐Ins.

Check the Scanto3D check box. Click OK.

Lecture 19 57

Open the Point Cloud File

Lecture 19 58

Run the Mesh Prep Wizard

ToolsScanTo3DMesh Prep Wizard… 1. Run the Mesh Prep Wizard.

2. Select the point cloud.

4. Orientation method, select None

because we did this in MATLAB.

5. Noise removal, zero assuming

geometry came from MATLAB.

7. Click the green check mark to finish.

Lecture 19 59

Point Cloud Density

Lecture 19 60

Final Notes on Point Clouds

• Other CAD packages have better point cloud import capabilities than SolidWorks. Rhino 3D is said to be excellent.

• Generating a solid model from the data can be done in SolidWorks. The meshed model is essentially used as a template for creating the solid model. This procedure is beyond the scope of this lecture.

Lecture 19 61

Importing Custom Polygons into SolidWorks

The Problem

Suppose we calculate the vertices of a polygon from an optimization in MATLAB.

How do we important the vertices so that the polygon can be imported exactly into Solidworks so that it can be extruded, cut, modified, etc.?

There is no feature in SolidWorks to do this!!

Lecture 19 63

Example Application

Placing a GMR filter onto a curved surface.

Grating period is spatially varied to compensate.

xx tan1  sin xR

inc R

1d R cos x R

K xK0 k0 ninc sin inc x

xK xdx

1 cos xcos f 

x

r

cos xcos f 

R. C. Rumpf, M. Gates, C. L. Kozikowski, W. A. Davis, "Guided‐Mode Resonance Filter Compensated to Operate on a Curved Surface," PIER C, Vol. 40, pp. 93‐103, 2013.

Lecture 19 64

Be Careful About XYZ Curves

There is a feature in SolidWorks “Curve Through XYZ Points” that appears to import discrete points, but it fits the points to a spline. This effectively rounds any corners and may produce intersections that cannot be rendered.

This should be a square! The four points are fit to a spline!

Lecture 19 65

Step 1 – Define the Polygon

Create an N×3 array in memory containing the all the points in the polygon. N is the number of points.

P =

0.6448 0 0

1.0941 0.3758 0

1.3427 1.0452 0

0.3642 0.5573 0

0.4753 1.8765 0

-0.0651 0.7853 0

-0.5258 1.1984 0

-0.4824 0.5240 0

-0.8912 0.4822 0

-0.9966 0.1664 0

-0.9087 -0.1517 0

-1.0666 -0.5774 0

-1.1762 -1.2777 0

-0.5403 -1.2314 0

-0.1403 -1.6931 0

0.3818 -1.5074 0

0.7795 -1.1927 0

0.8293 -0.6455 0

1.0972 -0.3766 0

0.6448 -0.0000 0

Lecture 19 66

Step 2 – Save as an IGES from MATLAB

There is a function called igesout() available for free download from the Mathworks website. This will save your polygon to an IGES file.

% SAVE IGES FILE

igesout(P,'poly');

This creates a file called “poly.igs” in your working directory.

Lecture 19 67

Step 3 – Open the IGES in SolidWorks (1 of 2)

Select the IGES file type in the [Open] file dialog. Then click on the [Options…] button.

Lecture 19 68

Step 3 – Open the IGES in SolidWorks (2 of 2)

1. Make sure that “Surface/solid entities” is unchecked

2. Ensure that “Free point/curve entities” is checked.

3. Click on the “Import as sketch(es) radio button.

Open the file.

Lecture 19 69

Step 4 – Convert to a Standard 2D Sketch

The polygon imports as a 3D sketch by default. Edit the 3D sketch and copy.

Open a new 2D sketch and paste.

Now you can do whatever you wish with the sketch! Extrude, revolve, cut extrude, etc.

Kursus Matlab di Jakarta Selatan KURSUS MATLAB ONLINE Skripsi, Tesis, DISERTASI 081219449060

Selasa, 13 Januari 2015

KURSUS MATLAB ONLINE Skripsi, Tesis, DISERTASI 081219449060

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