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Non-Uniform Temperature Distributions

c5,0

c0,1

c1,1

c2,1

.

.

.

c5,1

c0,2

.

.

.

c5,9

c0,10

c1,10

.

.

.

c4,10

c5,10

Polynomial Approximations of Temperature Distributions

The following tables state the different polynomials available for approximating temperature distributions. See Table 7.7 for a summary of the types of distributions.

Legendre Polynomials

Polynomial Number

Polynomial

0

1

 

 

1

x

 

 

2

0.5

( -1 + 3x2 )

3

0.5

( -3x + 5x3 )

4

0.125

( 3 – 30x2 + 35x4 )

5

0.125

( 15x – 70x3 + 63x5 )

TracePro 5.0 User’s Manual

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Technical Reference

TABLE 7.10. Zernike Polynomials

Polynomial Number

Polynomial

0

1

1

r cosθ

2

r sinθ

3

r2 cos2θ

4

2r2 – 1

5

r2 sin2θ

6

r3 cos3θ

7

( 3r3 – 2r ) cosθ

8

( 3r3 – 2r ) sinθ

9

r3 sin3θ

10

r4 cos4θ

11

( 4r4 – 3r2 ) cos2θ

12

6r4 - 6r2 + 1

13

( 4r4 – 3r2 ) sin2θ

14

r4 sin4θ

15

r5 cos5θ

16

( 5r5 – 4r3 ) cos3θ

17

( 10r5 – 12r3 + 3r ) cosθ

18

( 10r5 – 12r3 + 3r ) sinθ

19

( 5r5 – 4r3 ) sin3θ

20

r5 cos5θ

TABLE 7.11. Fourier Series

Term Number

Term

0

0.5

1

cosθ

2

sinθ

3

cos2θ

4

sin2θ

5

cos3θ

6

sin3θ

7

cos4θ

8

sin4θ

9

cos5θ

10

sin5θ

Rules for combining the preceding sets of functions with the user-defined coefficients are outlined in Table 7.12, and in greater detail in Table 7.13 through

7.76

TracePro 5.0 User’s Manual

Non-Uniform Temperature Distributions

Table 7.15. TracePro evaluates the user-created functions in three dimensions in order to find the temperature value at any point on the surface.

TABLE 7.12. Polynomial functions for calculating temperatures

Distribution Type

1

3

5

Function

T = ∑ ∑ai, jLi(x)Lj(y)

j = 0 i = 0

T = biZi(r, θ)

i = 0

T = ∑ ∑ci, jLi(z)Fj(θ)

j = 0 i = 0

TracePro 5.0 User’s Manual

7.77

Technical Reference

TABLE 7.13. Polynomial for Rectangular Surfaces

Coefficient (ai,j) a0,0

a1,0 a2,0 a3,0 a4,0 a5,0 a0,1 a1,1 a2,1 a3,1 a4,1 a5,1 a0,2 a1,2 a2,2 a3,2 a4,2 a5,2 a0,3 a1,3 a2,3 a3,3 a4,3 a5,3 a0,4 a1,4 a2,4 a3,4 a4,4 a5,4 a0,5 a1,5 a2,5 a3,5

First Legendre Polynomial (Li(x))

1 x

[0.5 ( -1 + 3x2 )] [0.5 ( -3x + 5x3 )]

[0.125 ( 3 – 30x2 + 35x4 )] [0.125 ( 15x – 70x3 + 63x5 )] 1

x

[0.5 ( -1 + 3x2 )] [0.5 ( -3x + 5x3 )]

[0.125 ( 3 – 30x2 + 35x4 )] [0.125 ( 15x – 70x3 + 63x5 )] 1

x

[0.5 ( -1 + 3x2 )] [0.5 ( -3x + 5x3 )]

[0.125 ( 3 – 30x2 + 35x4 )] [0.125 ( 15x – 70x3 + 63x5 )] 1

x

[0.5 ( -1 + 3x2 )] [0.5 ( -3x + 5x3 )]

[0.125 ( 3 – 30x2 + 35x4 )] [0.125 ( 15x – 70x3 + 63x5 )] 1

x

[0.5 ( -1 + 3x2 )] [0.5 ( -3x + 5x3 )]

[0.125 ( 3 – 30x2 + 35x4 )] [0.125 ( 15x – 70x3 + 63x5 )] 1

x

[0.5 ( -1 + 3x2 )] [0.5 ( -3x + 5x3 )]

Second Legendre Polynomial (Lj(y))

1

1

1

1

1

1 y y y y y y

[0.5 ( -1 + 3y2 )] [0.5 ( -1 + 3y2 )] [0.5 ( -1 + 3y2 )] [0.5 ( -1 + 3y2 )] [0.5 ( -1 + 3y2 )] [0.5 ( -1 + 3y2 )] [0.5 ( -3y + 5y3 )] [0.5 ( -3y + 5y3 )] [0.5 ( -3y + 5y3 )] [0.5 ( -3y + 5y3 )] [0.5 ( -3y + 5y3 )] [0.5 ( -3y + 5y3 )]

[ 0.125 ( 3 – 30y2 + 35y4 )] [ 0.125 ( 3 – 30y2 + 35y4 )] [ 0.125 ( 3 – 30y2 + 35y4 )] [ 0.125 ( 3 – 30y2 + 35y4 )] [ 0.125 ( 3 – 30y2 + 35y4 )] [ 0.125 ( 3 – 30y2 + 35y4 )] [0.125 ( 15y – 70y3 + 63y5 )] [0.125 ( 15y – 70y3 + 63y5 )] [0.125 ( 15y – 70y3 + 63y5 )] [0.125 ( 15y – 70y3 + 63y5 )]

7.78

TracePro 5.0 User’s Manual

 

 

 

Non-Uniform Temperature Distributions

 

 

 

 

 

a4,5

[0.125 ( 3 – 30x2 + 35x4 )]

[0.125 ( 15y – 70y3 + 63y5 )]

 

a5,5

[0.125 ( 15x – 70x3 + 63x5 )]

[0.125 ( 15y – 70y3 + 63y5 )]

TABLE 7.14. Polynomial for Circular Surfaces

Coefficient (bi) b0

b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b20

Zernike Polynomial (Zi(r, θ))

1

(r cosθ)

(r sinθ)

(r2 cos2θ) (2r2 – 1) (r2 sin2θ)

(r3 cos3θ)

[( 3r3 – 2r ) cosθ]

[( 3r3 – 2r ) sinθ] (r3 sin3θ)

(r4 cos4θ)

[( 4r4 – 3r2 ) cos2θ] (6r4 - 6r2 + 1)

[( 4r4 – 3r2 ) sin2θ] (r4 sin4θ)

(r5 cos5θ)

[( 5r5 – 4r3 ) cos3θ]

[( 10r5 – 12r3 + 3r ) cosθ] [( 10r5 – 12r3 + 3r ) sinθ] [( 5r5 – 4r3 ) sin3θ]

(r5 cos5θ)

TABLE 7.15. Polynomial for Cylindrical Surfaces

Coefficient (ci,j)

Legendre Polynomial (Li(z))

Fourier Series (Fj(θ))

c0,0

1

0.5

c1,0

z

0.5

c2,0

[0.5 ( -1 + 3z2 )]

0.5

c3,0

[0.5 ( -3z + 5z3 )]

0.5

c4,0

[0.125 ( 3 – 30z2 + 35z4 )]

0.5

c5,0

[0.125 ( 15z – 70z3 + 63z5 )]

0.5

c0,1

1

cosθ

TracePro 5.0 User’s Manual

7.79

Technical Reference

c1,1 c2,1 c3,1 c4,1 c5,1 c0,2 c1,2 c2,2 c3,2 c4,2 c5,2 c0,3 c1,3 c2,3 c3,3 c4,3 c5,3 c0,4 c1,4 c2,4 c3,4 c4,4 c5,4 c0,5 c1,5 c2,5 c3,5 c4,5 c5,5 c0,6 c1,6 c2,6 c3,6 c4,6 c5,6 c0,7

z

[0.5 ( -1 + 3z2 )] [0.5 ( -3z + 5z3 )]

[0.125 ( 3 – 30z2 + 35z4 )] [0.125 ( 15z – 70z3 + 63z5 )] 1

z

[0.5 ( -1 + 3z2 )] [0.5 ( -3z + 5z3 )]

[0.125 ( 3 – 30z2 + 35z4 )] [0.125 ( 15z – 70z3 + 63z5 )] 1

z

[0.5 ( -1 + 3z2 )] [0.5 ( -3z + 5z3 )]

[0.125 ( 3 – 30z2 + 35z4 )] [0.125 ( 15z – 70z3 + 63z5 )] 1

z

[0.5 ( -1 + 3z2 )] [0.5 ( -3z + 5z3 )]

[0.125 ( 3 – 30z2 + 35z4 )] [0.125 ( 15z – 70z3 + 63z5 )] 1

z

[0.5 ( -1 + 3z2 )] [0.5 ( -3z + 5z3 )]

[0.125 ( 3 – 30z2 + 35z4 )] [0.125 ( 15z – 70z3 + 63z5 )] 1

z

[0.5 ( -1 + 3z2 )] [0.5 ( -3z + 5z3 )]

[0.125 ( 3 – 30z2 + 35z4 )] [0.125 ( 15z – 70z3 + 63z5 )] 1

cosθ

cosθ

cosθ

cosθ

cosθ

sinθ

sinθ

sinθ

sinθ

sinθ

sinθ

cos2θ

cos2θ

cos2θ

cos2θ

cos2θ

cos2θ

sin2θ

sin2θ

sin2θ

sin2θ

sin2θ

sin2θ

cos3θ

cos3θ

cos3θ

cos3θ

cos3θ

cos3θ

sin3θ

sin3θ

sin3θ

sin3θ

sin3θ

sin3θ

cos4θ

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TracePro 5.0 User’s Manual

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