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Drawing rotator with parametric curves

Posted Oct 7, 2011, 11:43 a.m. EDT 1 Reply

Supradeep Narayana
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I am looking to draw the concentric shells as shown in the uploaded figure, it is a rotator design. I am having difficulty drawing the layers with parametric curves. In polar coordinates , the equation is

r = a * exp( theta/cot(tau/2)) ; where tau = 0.5* (sqrt(t^2+4) -t); and t = rotation angle / log(r2/r1)
where r1 and r2 are inner and outer radii.

with parametric curves I just get straight lines.

Advice and help in drawing the curves ( to construct the layered material is appreciated).

Ref : H Chen and CT Chan,Electromagnetic wave manipulator by layered systems using transformation media concept, PRB 78,054204(2008)



thanks in advance.
supra

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1 Reply Last Post Feb 9, 2012, 9:40 p.m. EST
COMSOL Moderator

Hello Supradeep Narayana

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Rugang Geng
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Posted: 1 decade ago Feb 9, 2012, 9:40 p.m. EST
Hello, I have the similar problems. I want to draw a function curve y=a*cos^2(pi*x/b) to get a bump region, but in the parametric curve, I only get some lines.

Details of my setting:
Parametric Curve
Parameter: s
min: 0
max: 1

Expression:
x: s
y=a*cos^2(pi*s/b)


thanks for your time and consideration
Rugang Geng
Hello, I have the similar problems. I want to draw a function curve y=a*cos^2(pi*x/b) to get a bump region, but in the parametric curve, I only get some lines. Details of my setting: Parametric Curve Parameter: s min: 0 max: 1 Expression: x: s y=a*cos^2(pi*s/b) thanks for your time and consideration Rugang Geng

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