Accuracy of vibro-acoustic computations using non-equidistant frequency spacing

被引:3
作者
Klaerner, Matthias [1 ]
Wuehrl, Mario [1 ]
Kroll, Lothar [1 ,2 ]
Marburg, Steffen [3 ]
机构
[1] Tech Univ Chemnitz, Inst Lightweight Struct, D-09107 Chemnitz, Germany
[2] Opole Univ Technol, Inst Mech, PL-45758 Opole, Poland
[3] Tech Univ Munich, Gerhard Zeidler Endowed Professorship Vibroacoust, D-85748 Garching, Germany
关键词
Sound radiation; Structure borne sound; Approximation methods; Finite Element Analysis; Equivalent radiated sound power; Lumped parameter model; STRUCTURAL-ACOUSTIC OPTIMIZATION; FIBER-REINFORCED COMPOSITES; LUMPED-PARAMETER MODEL; AVERAGED INPUT POWER; RESIDUE THEOREM; DESIGN; OUTPUT;
D O I
10.1016/j.apacoust.2018.09.008
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Within the vibro-acoustic optimisation of complex components under dynamic loading the radiated sound power is commonly used as an objective. For this purpose, the frequency-dependent sound power has to be quantified by a single scalar objective. For the required steady state simulations the mode-based frequency spacing can include non-equidistant step sizes as well as can change due to structural or material modifications. Thus, the total number of frequency steps is depending on the number of contributing modes that can be changed during optimisation processes with structural or material modifications. Furthermore, the accuracy of the objective has to be assured by choosing the required number of frequency steps and avoiding either under-resolved peaks or too many frequency steps. In this study, we present an approach for the determination of the averaged sound power within the covered frequency range with non-equidistant spacing based on the power spectral density. These scalar quantities are robust to any model changes. Thereafter, the mean power is used as a convergence criterion to determine the number of required frequency steps for a single mode and thus to reduce the computational efforts to a minimum. Further, a recommendation for a common rule for the spacing of single mode is given. This results in the frequency spacing estimation depending on the distance of neighbouring modes as well as the damping and biasing. Moreover, the combination of robust scalar objectives and efficient frequency spacing opens the prospects of accessing sound power objectives for complex optimisation problems. (C) 2018 The Authors. Published by Elsevier Ltd.
引用
收藏
页码:60 / 68
页数:9
相关论文
共 35 条
[1]   Damping in advanced polymer-matrix composites [J].
Adams, RD ;
Maheri, MR .
JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 355 (1-2) :126-130
[2]   2D damping predictions of fiber composite plates: Layup effects [J].
Billups, E. K. ;
Cavalli, M. N. .
COMPOSITES SCIENCE AND TECHNOLOGY, 2008, 68 (3-4) :727-733
[3]  
Cremer L, 2005, STRUCTURE BORNE SOUN
[4]   A refined use of the residue theorem for the evaluation of band-averaged input power into linear second-order dynamic systems [J].
D'Amico, R. ;
Huybrechs, D. ;
Desmet, W. .
JOURNAL OF SOUND AND VIBRATION, 2014, 333 (06) :1796-1817
[5]   On the use of the residue theorem for the efficient evaluation of band-averaged input power into linear second-order dynamic systems [J].
D'Amico, R. ;
Koo, K. ;
Huybrechs, D. ;
Desmet, W. .
JOURNAL OF SOUND AND VIBRATION, 2013, 332 (26) :7205-7225
[6]  
Davis P. J., 1984, Methods of Numerical Integration, V2nd ed
[7]   Structural-acoustic optimization of sandwich structures with cellular cores for minimum sound radiation [J].
Denli, H. ;
Sun, J. Q. .
JOURNAL OF SOUND AND VIBRATION, 2007, 301 (1-2) :93-105
[8]   Numerical implementation of the lumped parameter model for the acoustic power output of a vibrating structure [J].
Fahnline, JB ;
Koopmann, GH .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1997, 102 (01) :179-192
[9]   A lumped parameter model for the acoustic power output from a vibrating structure [J].
Fahnline, JB ;
Koopmann, GH .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1996, 100 (06) :3539-3547
[10]   Recent research on enhancement of damping in polymer composites [J].
Finegan, IC ;
Gibson, RF .
COMPOSITE STRUCTURES, 1999, 44 (2-3) :89-98