geomss.geom.cst

Class CSTClassFunction

java.lang.Object

geomss.geom.cst.CSTClassFunction

All Implemented Interfaces:

j2me.io.Serializable, java.lang.Cloneable, javolution.lang.Immutable, javolution.lang.ValueType, javolution.xml.XMLSerializable

public final class CSTClassFunction
extends java.lang.Object
implements java.lang.Cloneable, javolution.xml.XMLSerializable, javolution.lang.ValueType

A generic Class-Shape-Transform (CST) class function implementation. The "class" of the function is determined by the input exponents: C(s) = (s)^N1*(1 - s)^N2.

Modified by: Joseph A. Huwaldt

Version:

November 28, 2015

Author:

Joseph A. Huwaldt Date: March 14, 2014

Field Summary

Fields

Modifier and Type	Field and Description
static CSTClassFunction	BLUNTNOSED_AIRFOIL A class function for a blunt-nosed airfoil (subsonic airfoil).
static CSTClassFunction	CONE_WEDGE A class function for a cone or wedge shape.
static CSTClassFunction	ELLIPTICAL A class function for an elliptical shape/airfoil.
static CSTClassFunction	RECTANGULAR A class function for a rectangular shape.
static CSTClassFunction	SEARS_HAACK A class function for a Sears-Haack minimum wave-drag body profile.
static CSTClassFunction	SHARPNOSED_AIRFOIL A class function for a sharp-nosed airfoil (supersonic airfoil).

Method Summary

Modifier and Type	Method and Description
CSTClassFunction	copy() Returns a copy of this CSTClassFunction instance allocated by the calling thread (possibly on the stack).
boolean	equals(java.lang.Object obj) Compares this CSTClassFunction against the specified object for strict equality (same values).
double[]	getDerivatives(double s, int grade) Calculate all the derivatives from 0 to grade with respect to parametric distance on the class function for the given parametric distance along the class function, d^{grade}p(s)/d^{grade}s.
double	getN1() Return the first exponent of the class function, N1.
double	getN2() Return the second exponent of the class function, N2.
double	getValue(double s) Return the value of this class function at the specified parametric location.
int	hashCode() Returns the hash code for this object.
static CSTClassFunction	newInstance(double N1, double N2) Construct a new CST Class Function using the specified exponents.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

BLUNTNOSED_AIRFOIL

public static final CSTClassFunction BLUNTNOSED_AIRFOIL

A class function for a blunt-nosed airfoil (subsonic airfoil).

SHARPNOSED_AIRFOIL

public static final CSTClassFunction SHARPNOSED_AIRFOIL

A class function for a sharp-nosed airfoil (supersonic airfoil).

ELLIPTICAL

public static final CSTClassFunction ELLIPTICAL

A class function for an elliptical shape/airfoil.

SEARS_HAACK

public static final CSTClassFunction SEARS_HAACK

A class function for a Sears-Haack minimum wave-drag body profile.

CONE_WEDGE

public static final CSTClassFunction CONE_WEDGE

A class function for a cone or wedge shape.

RECTANGULAR

public static final CSTClassFunction RECTANGULAR

A class function for a rectangular shape.

Method Detail

newInstance

public static CSTClassFunction newInstance(double N1,
                                           double N2)

Construct a new CST Class Function using the specified exponents.

Parameters:

N1 - The 1st exponent of the class function (leading edge exponent).

N2 - The 2nd exponent of the class function (trailing edge exponent).

Returns:

getN1

public double getN1()

Return the first exponent of the class function, N1.

Returns:

The first exponent of the class function.

getN2

public double getN2()

Return the second exponent of the class function, N2.

Returns:

The second exponent of the class function.

getValue

public double getValue(double s)

Return the value of this class function at the specified parametric location.

Parameters:

s - The parametric distance to calculate this class functions value for (0 to 1 inclusive).

Returns:

The value of this class function at the specified parametric location.

getDerivatives

public double[] getDerivatives(double s,
                               int grade)

Calculate all the derivatives from 0 to grade with respect to parametric distance on the class function for the given parametric distance along the class function, d^{grade}p(s)/d^{grade}s.

Example:
1st derivative (grade = 1), this returns [p(s), dp(s)/ds];
2nd derivative (grade = 2), this returns [p(s), dp(s)/ds, d^2p(s)/d^2s]; etc.

Parameters:

s - Parametric distance to calculate derivatives for (0.0 to 1.0 inclusive).

grade - The maximum grade to calculate the derivatives for (0 = value only, 1=value + 1st derivative, 2=value + 1st derivative + 2nd derivative, etc)

Returns:

A list of derivatives up to the specified grade of the class function at the specified parametric position.

Throws:

java.lang.IllegalArgumentException - if the grade is < 0.

equals

public boolean equals(java.lang.Object obj)

Compares this CSTClassFunction against the specified object for strict equality (same values).

Overrides:

equals in class java.lang.Object

Parameters:

obj - the object to compare with.

Returns:

true if this object is identical to that object; false otherwise.

hashCode

public int hashCode()

Returns the hash code for this object.

Overrides:

hashCode in class java.lang.Object

Returns:

the hash code value.

copy

public CSTClassFunction copy()

Returns a copy of this CSTClassFunction instance allocated by the calling thread (possibly on the stack).

Specified by:

copy in interface javolution.lang.ValueType

Returns:

an identical and independent copy of this object.