ACPOWER

I/O Options and Subcase Information Entry Used in the I/O Options section or in frequency response (direct and modal) subcases to request acoustic power radiated across a panel.

Format

ACPOWER (format) = option

Definitions

Argument Options Description
format <H3D, PCH, blank>
H3D
Results are output in Hyper3D format (.h3d file).
PCH
Results are output in Punch format (.pch file).
Blank (Default)
Results are output in all active formats for which the result is available.
option <YES, ALL, NO, NONE>
YES, ALL (Default), blank
The acoustic power is computed for all panels defined by PANELG with ACPOWER type in the Bulk section. 1
NO, NONE
Acoustic Power is not output.

Comments

  1. The result is output for every PANELG entry whose type is ACPOWER. In this case, PANELG also accommodates a SURF entry.
  2. Multiple formats are allowed on the same entry; these should be comma-separated. If a format is not specified, this output control applies to all formats defined by the OUTPUT command, for which the result is available.
  3. Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
  4. The acoustic power is calculated using the surface integral of the real part ( R e MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOuamaaBa aaleaacaWGLbaabeaaaaa@37E3@ ) of acoustic intensity I _ ( Ω ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake aaceWGjbGba0badaqadaqaaiabfM6axbGaayjkaiaawMcaaaaa@3CE0@ . (1)
    P = ∫ s Re [ I _ ( Ω ) ] ⋅ n _ d ​ S MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake GabaaDqiaadcfacqGH9aqpdaWdrbqaaiGackfacaGGLbaaleaacaWG ZbaabeqdcqGHRiI8aOWaamWaaeaaceWGjbGba0badaqadaqaaiabfM 6axbGaayjkaiaawMcaaaGaay5waiaaw2faaiabgwSixlWac6gagaqh aiGacsgacaWLa8UaaGzaVlaadofaaaa@4E77@
    Where,
    S MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake aacaWGtbaaaa@39AF@
    Surface area of the panel
    n MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake aacaWGtbaaaa@39AF@
    Local normal of the surface
    The expression for acoustic intensity is related to the nodal pressure ( p MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake aacaWGWbaaaa@39CC@ ) and the complex conjugate of the particle velocity ( ν * MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake aacqaH9oGBcaGGQaaaaa@3B3D@ ), given by:(2)
    I _ ( Ω ) = 1 2 p v _ * MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake GabaaDqiqadMeagaqhamaabmaabaGaeuyQdCfacaGLOaGaayzkaaGa eyypa0ZaaSaaaeaacaaIXaaabaGaaGOmaaaacaWGWbGabmODayaaDa GaaiOkaaaa@42B6@
  5. The calculation of ACPOWER in decibels (dB) is performed using the PARAM, ACPREFDB, for which the following equation is used. ACPREFDB is the reference value of the power.(3)
    ACPOWER( dB )=10* log 10 ( ACPOWER ACPREFDB ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake GabaaDqiaadgeacaWGdbGaamiuaiaad+eacaWGxbGaamyraiaadkfa daqadaqaaiaadsgacaWGcbaacaGLOaGaayzkaaGaeyypa0JaaGymai aaicdacaGGQaGaciiBaiaac+gacaGGNbWaaSbaaSqaaiaaigdacaaI WaaabeaakmaabmaabaWaaSaaaeaacaWGbbGaam4qaiaadcfacaWGpb Gaam4vaiaadweacaWGsbaabaGaamyqaiaadoeacaWGqbGaamOuaiaa dweacaWGgbGaamiraiaadkeaaaaacaGLOaGaayzkaaaaaa@579B@