Performs FFT of pressure field to generate noise data. More...

Inheritance diagram for noiseFFT:

Collaboration diagram for noiseFFT:

Public Member Functions
	noiseFFT (const scalar deltaT, const label windowSize=-1)
	Construct from pressure field. More...

	~noiseFFT ()
	Destructor. Cleanup/destroy plan. More...

void	setData (scalarList &data)

void	setData (const fileName &pFileName, const label skip=0)
	Set the pressure data by reading from file with an optional offset. More...

graph	pt () const
	Return the graph of pressure as a function of time. More...

tmp< scalarField >	Pf (const tmp< scalarField > &pn) const
	Return the fft of the given pressure data. More...

graph	meanPf (const windowModel &window) const
	Return the multi-window mean fft of the complete pressure data [Pa]. More...

graph	RMSmeanPf (const windowModel &window) const
	Return the multi-window RMS mean fft of the complete pressure. More...

graph	PSDf (const windowModel &window) const
	Return the multi-window PSD (power spectral density) of the complete. More...

graph	PSD (const graph &gPSDf) const
	Return the PSD [dB/Hz]. More...

graph	octaves (const graph &g, const labelUList &freqBandIDs) const
	Generate octave data. More...

scalar	dbToPa (const scalar db) const
	Convert the db into Pa. More...

tmp< scalarField >	dbToPa (const tmp< scalarField > &db) const
	Convert the db-field into Pa. More...

Public Member Functions inherited from Field< scalar >
constexpr	Field () noexcept
	Construct null. More...

	Field (const label len)
	Construct given size. More...

	Field (const label len, const scalar &val)
	Construct given size and initial value. More...

	Field (const label len, const zero)
	Construct given size and initial values of zero. More...

	Field (const Field< scalar > &fld)
	Copy construct. More...

	Field (const UList< scalar > &list)
	Copy construct from UList<Type> More...

	Field (const IndirectListBase< scalar, Addr > &list)
	Copy construct from IndirectList. More...

	Field (Field< scalar > &&fld)
	Move construct from Field. More...

	Field (List< scalar > &&list)
	Move construct from List. More...

	Field (DynamicList< scalar, SizeMin > &&list)
	Move construct from DynamicList. More...

	Field (const UList< scalar > &mapF, const labelUList &mapAddressing)
	Construct by 1 to 1 mapping from the given field. More...

	Field (const tmp< Field< scalar >> &tmapF, const labelUList &mapAddressing)
	Construct by 1 to 1 mapping from the given tmp field. More...

	Field (const UList< scalar > &mapF, const labelListList &mapAddressing, const scalarListList &weights)
	Construct by interpolative mapping from the given field. More...

	Field (const tmp< Field< scalar >> &tmapF, const labelListList &mapAddressing, const scalarListList &weights)
	Construct by interpolative mapping from the given tmp field. More...

	Field (const UList< scalar > &mapF, const FieldMapper &map, const bool applyFlip=true)
	Construct by mapping from the given field. More...

	Field (const UList< scalar > &mapF, const FieldMapper &map, const scalar &defaultValue, const bool applyFlip=true)
	Construct by mapping from the given field. More...

	Field (const UList< scalar > &mapF, const FieldMapper &map, const UList< scalar > &defaultValues, const bool applyFlip=true)
	Construct by mapping from the given field. More...

	Field (const tmp< Field< scalar >> &tmapF, const FieldMapper &map, const bool applyFlip=true)
	Construct by mapping from the given tmp field. More...

	Field (const tmp< Field< scalar >> &tmapF, const FieldMapper &map, const scalar &defaultValue, const bool applyFlip=true)

	Field (const tmp< Field< scalar >> &tmapF, const FieldMapper &map, const UList< scalar > &defaultValues, const bool applyFlip=true)

	Field (Field< scalar > &fld, bool reuse)
	Copy construct or re-use as specified. More...

	Field (const tmp< Field< scalar >> &tfld)
	Copy or move construct from tmp. More...

	Field (Istream &is)
	Construct from Istream. More...

	Field (const word &keyword, const dictionary &dict, const label len)
	Construct from a dictionary entry. More...

tmp< Field< scalar > >	clone () const
	Clone. More...

void	map (const UList< scalar > &mapF, const labelUList &mapAddressing)
	1 to 1 map from the given field More...

void	map (const tmp< Field< scalar >> &tmapF, const labelUList &mapAddressing)
	1 to 1 map from the given tmp field More...

void	map (const UList< scalar > &mapF, const labelListList &mapAddressing, const scalarListList &weights)
	Interpolative map from the given field. More...

void	map (const tmp< Field< scalar >> &tmapF, const labelListList &mapAddressing, const scalarListList &weights)
	Interpolative map from the given tmp field. More...

void	map (const UList< scalar > &mapF, const FieldMapper &map, const bool applyFlip=true)
	Map from the given field. More...

void	map (const tmp< Field< scalar >> &tmapF, const FieldMapper &map, const bool applyFlip=true)
	Map from the given tmp field. More...

void	autoMap (const FieldMapper &map, const bool applyFlip=true)
	Map from self. More...

void	rmap (const UList< scalar > &mapF, const labelUList &mapAddressing)
	1 to 1 reverse-map from the given field More...

void	rmap (const tmp< Field< scalar >> &tmapF, const labelUList &mapAddressing)
	1 to 1 reverse-map from the given tmp field More...

void	rmap (const UList< scalar > &mapF, const labelUList &mapAddressing, const UList< scalar > &weights)
	Interpolative reverse map from the given field. More...

void	rmap (const tmp< Field< scalar >> &tmapF, const labelUList &mapAddressing, const UList< scalar > &weights)
	Interpolative reverse map from the given tmp field. More...

void	negate ()
	Negate this field (negative). More...

tmp< Field< cmptType > >	component (const direction) const
	Return a component field of the field. More...

void	replace (const direction, const UList< cmptType > &)
	Replace a component field of the field. More...

void	replace (const direction, const tmp< Field< cmptType >> &)
	Replace a component field of the field. More...

void	replace (const direction, const cmptType &)
	Replace a component field of the field. More...

VSForm	block (const label start) const

tmp< Field< scalar > >	T () const
	Return the field transpose (only defined for second rank tensors) More...

void	writeEntry (const word &keyword, Ostream &os) const
	Write the field as a dictionary entry. More...

void	operator= (const Field< scalar > &)
	Copy assignment. More...

void	operator= (const tmp< Field< scalar >> &)

void	operator= (const UList< scalar > &)

void	operator= (const SubField< scalar > &)

void	operator= (Field< scalar > &&rhs)
	Move assignment. More...

void	operator= (List< scalar > &&rhs)

void	operator= (DynamicList< scalar, SizeMin > &&rhs)

void	operator= (const scalar &val)
	Value assignment. More...

void	operator= (const zero)

void	operator= (const VectorSpace< Form, Cmpt, nCmpt > &)

void	operator= (const tmp< Field > &rhs)

void	operator+= (const UList< scalar > &)

void	operator+= (const tmp< Field< scalar >> &)

void	operator+= (const scalar &)

void	operator-= (const UList< scalar > &)

void	operator-= (const tmp< Field< scalar >> &)

void	operator-= (const scalar &)

void	operator*= (const UList< scalar > &)

void	operator*= (const tmp< Field< scalar >> &)

void	operator*= (const scalar &)

void	operator/= (const UList< scalar > &)

void	operator/= (const tmp< Field< scalar >> &)

void	operator/= (const scalar &)

Static Public Member Functions
static tmp< scalarField >	frequencies (const label N, const scalar deltaT)
	Return the FFT frequencies. More...

static tmp< scalarField >	PSD (const scalarField &PSDf)
	Return the PSD [dB/Hz]. More...

static tmp< scalarField >	SPL (const scalarField &Prms2)
	Return the SPL [dB]. More...

static void	octaveBandInfo (const scalarField &f, const scalar fLower, const scalar fUpper, const scalar octave, labelList &fBandIDs, scalarField &fCentre)
	Return a list of the frequency indices wrt f field that. More...

Static Public Member Functions inherited from Field< scalar >
static const Field< scalar > &	null ()
	Return nullObject reference field. More...

static autoPtr< Field< scalar > >	New (Istream &is)
	Return a pointer to a new Field created on freestore. More...

static tmp< Field< scalar > >	NewCalculatedType (const Field< Type2 > &f)

Static Public Attributes
static scalar	p0 = 2e-5
	Reference pressure. More...

Additional Inherited Members
Public Types inherited from Field< scalar >
typedef pTraits< scalar >::cmptType	cmptType
	Component type. More...

typedef SubField< scalar >	subField
	Declare type of subField. More...

Detailed Description

Performs FFT of pressure field to generate noise data.

General functionality:

Pf: fft of the pressure data
meanPf: multi-window mean fft
RMSmeanPf: multi-window RMS mean fft
PSDf: multi-window power spectral density (PSD) in frequency domain
PSD: power spectral density in dB/Hz
SPL: sound pressure level in dB

Octave-based data:

PSD spectrum
SPL spectrum

Source files

See also: windowModel.H

Definition at line 69 of file noiseFFT.H.

Constructor & Destructor Documentation

◆ noiseFFT()

noiseFFT	(	const scalar	deltaT,
		const label	windowSize = `-1`
	)

Construct from pressure field.

Definition at line 144 of file noiseFFT.C.

◆ ~noiseFFT()

~noiseFFT ( )

Destructor. Cleanup/destroy plan.

Definition at line 176 of file noiseFFT.C.

Member Function Documentation

◆ frequencies()

Foam::tmp< Foam::scalarField > frequencies	(	const label	N,
		const scalar	deltaT
	)

static

Return the FFT frequencies.

Definition at line 44 of file noiseFFT.C.

References f(), forAll, N(), tmp< T >::New(), and Foam::Zero.

Referenced by surfaceNoise::calculate().

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◆ PSD() [1/2]

Foam::tmp< Foam::scalarField > PSD ( const scalarField & PSDf )

static

Return the PSD [dB/Hz].

Input PSD in [Pa^2/Hz]

Definition at line 62 of file noiseFFT.C.

References Foam::log10(), p0, and Foam::sqr().

Referenced by surfaceNoise::calculate(), and pointNoise::processData().

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◆ SPL()

Foam::tmp< Foam::scalarField > SPL ( const scalarField & Prms2 )

static

Return the SPL [dB].

Input P(rms)^2 in [Pa^2]

Definition at line 68 of file noiseFFT.C.

References Foam::log10(), p0, and Foam::sqr().

Referenced by surfaceNoise::calculate(), and pointNoise::processData().

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◆ octaveBandInfo()

void octaveBandInfo	(	const scalarField &	f,
		const scalar	fLower,
		const scalar	fUpper,
		const scalar	octave,
		labelList &	fBandIDs,
		scalarField &	fCentre
	)

static

Return a list of the frequency indices wrt f field that.

correspond to the bands limits for a given octave

Definition at line 75 of file noiseFFT.C.

References f(), forAll, and Foam::pow().

Referenced by surfaceNoise::calculate(), and pointNoise::processData().

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◆ setData() [1/2]

void setData ( scalarList & data )

Set the pressure data

Note: transfers storage to *this

Definition at line 189 of file noiseFFT.C.

References Foam::average(), and p.

Referenced by pointNoise::processData().

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◆ setData() [2/2]

void setData	(	const fileName &	pFileName,
		const label	skip = `0`
	)

Set the pressure data by reading from file with an optional offset.

Definition at line 198 of file noiseFFT.C.

References Foam::average(), IOstream::eof(), Foam::exit(), Foam::FatalError, FatalErrorInFunction, IOstream::good(), p, and T0.

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◆ pt()

Foam::graph pt ( ) const

Return the graph of pressure as a function of time.

Definition at line 256 of file noiseFFT.C.

References forAll.

◆ Pf()

Foam::tmp< Foam::scalarField > Pf ( const tmp< scalarField > & pn ) const

Return the fft of the given pressure data.

Definition at line 276 of file noiseFFT.C.

References Foam::abort(), tmp< T >::clear(), Foam::FatalError, FatalErrorInFunction, forAll, Foam::mag(), n, tmp< T >::New(), Foam::constant::atomic::re, fft::realTransform1D(), and Foam::sqrt().

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◆ meanPf()

Foam::graph meanPf ( const windowModel & window ) const

Return the multi-window mean fft of the complete pressure data [Pa].

Definition at line 323 of file noiseFFT.C.

References windowModel::apply(), f(), forAll, N(), windowModel::nSamples(), windowModel::nWindow(), and Foam::Zero.

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◆ RMSmeanPf()

Foam::graph RMSmeanPf ( const windowModel & window ) const

Return the multi-window RMS mean fft of the complete pressure.

data [Pa]

Definition at line 355 of file noiseFFT.C.

References windowModel::apply(), f(), forAll, N(), windowModel::nSamples(), windowModel::nWindow(), Foam::sqr(), Foam::sqrt(), and Foam::Zero.

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◆ PSDf()

Foam::graph PSDf ( const windowModel & window ) const

Return the multi-window PSD (power spectral density) of the complete.

pressure data [Pa^2/Hz]

Definition at line 386 of file noiseFFT.C.

References windowModel::apply(), Foam::average(), Foam::endl(), f(), forAll, N(), windowModel::nSamples(), windowModel::nWindow(), Foam::Pout, Foam::sqr(), and Foam::Zero.

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◆ PSD() [2/2]

Foam::graph PSD ( const graph & gPSDf ) const

Return the PSD [dB/Hz].

Takes PSD in [Pa^2/Hz]

Definition at line 431 of file noiseFFT.C.

References Foam::log10(), p0, Foam::sqr(), graph::x(), and graph::y().

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◆ octaves()

Foam::graph octaves	(	const graph &	g,
		const labelUList &	freqBandIDs
	)		const

Generate octave data.

Definition at line 445 of file noiseFFT.C.

References Foam::endl(), f(), g, UList< T >::size(), WarningInFunction, and Foam::Zero.

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◆ dbToPa() [1/2]

Foam::scalar dbToPa ( const scalar db ) const

Convert the db into Pa.

Definition at line 501 of file noiseFFT.C.

References p0, and Foam::pow().

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◆ dbToPa() [2/2]

Foam::tmp< Foam::scalarField > dbToPa ( const tmp< scalarField > & db ) const

Convert the db-field into Pa.

Definition at line 508 of file noiseFFT.C.

References p0, and Foam::pow().

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Member Data Documentation

◆ p0

Foam::scalar p0 = 2e-5

static

Reference pressure.

Definition at line 109 of file noiseFFT.H.

The documentation for this class was generated from the following files:

src/randomProcesses/noise/noiseFFT/noiseFFT.H
src/randomProcesses/noise/noiseFFT/noiseFFT.C

Public Member Functions

Static Public Member Functions

Static Public Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ noiseFFT()

◆ ~noiseFFT()

Member Function Documentation

◆ frequencies()

◆ PSD() [1/2]

◆ SPL()

◆ octaveBandInfo()

◆ setData() [1/2]

◆ setData() [2/2]

◆ pt()

◆ Pf()

◆ meanPf()

◆ RMSmeanPf()

◆ PSDf()

◆ PSD() [2/2]

◆ octaves()

◆ dbToPa() [1/2]

◆ dbToPa() [2/2]

Member Data Documentation

◆ p0