Layout of Sound Absorbing Materials in 3D Rooms Using Damping Contributions with Eigenvectors as Weight Coefficients

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概要

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• In this study, we estimate an efficient layout of sound absorbing materials in three-dimensional spaces. For this purpose, we use damping contributions with eigenvectors as weight coefficients. Three-dimensional finite Elements of absorbing materials are modeled using a complex effective density and a complex bulk modulus of elasticity. By expanding the solution of complex eigenvalue problem with a small parameter related to damping, we derive the first order approximate equations of motion with respect to the small parameter. From these equations, the contribution of each element to modal damping is derived in consideration of multiple modes. The sound absorbing materials are arranged in three-dimensional spaces according to this contribution and by considering the components of eigenvectors at the evaluation points as the weight coefficients. The effectiveness of this method is verified using an expanded chamber.

• 一般社団法人 日本機械学会の論文

著者

• TSUGAWA Junichi

  Post Graduate School of Gunma University

• YAMAGUCHI Takao

  Gunma University

• ENOMOTO Hideki

  Fuji Heavy Industries Ltd.

• KUROSAWA Yoshio

  Fuji Heavy Industries Ltd.

関連論文

• Analysis of Damped Vibration for Viscoelastic Blocks Connected by a Nonlinear Spring with Linear Hysteresis Using FEM Described by Normal Coordinate
• Layout of Sound Absorbing Materials in 3D Rooms Using Damping Contributions with Eigenvectors as Weight Coefficients

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