A modal impedance technique for mid and high frequency analysis of an uncertain stiffened composite plate


SEÇGİN A., Kara M., Ozankan A.

JOURNAL OF SOUND AND VIBRATION, vol.366, pp.396-406, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 366
  • Publication Date: 2016
  • Doi Number: 10.1016/j.jsv.2015.12.027
  • Journal Name: JOURNAL OF SOUND AND VIBRATION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.396-406
  • Keywords: Mid frequency, High frequency, Uncertainty, Laminated composite plate, Monte Carlo simulation, STATISTICAL ENERGY ANALYSIS, COUPLING LOSS FACTORS, TRANSMISSION, PARAMETERS
  • Dokuz Eylül University Affiliated: Yes

Abstract

A modal impedance technique is introduced for mid frequency vibration analyses. The approach is mainly based on statistical energy analysis (SEA), however loss factors are determined by not only driving but also contributed by transfer mobilities. The mobilities are computed by finite element modal analysis. The technique takes geometrical complexity and boundary condition into account to handle their mid-frequency effects. It is applied to a stiffened composite plate having randomized mass, i.e., uncertain plate. For the verification, several numerical and experimental tests are performed. Internal damping of subsystems is evaluated using power injection and is then fed to finite element software to perform numerical analyses. Monte Carlo simulation is employed for the uncertainty analyses. To imitate plate mass heterogeneity, many small masses are used in both numerical and experimental analysis. It is shown that the proposed technique can reliably be used for vibration analyses of uncertain complex structures from mid to high frequency regions. (C) 2015 Elsevier Ltd. All rights reserved.