Arief Gunawan - Academia.edu (original) (raw)

Papers by Arief Gunawan

Engineering Analysis With Boundary Elements, 2005

... Department of Mechanical and Environmental Informatics, Graduate School of Information Scienc... more ... Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-12-1-W8-22, Ookayama, Meguro-ku, Tokyo 152-8552, Japan. Received 28 January 2005; Accepted 10 May 2005. ...

Key Engineering Materials, 2006

Page 1. Numerical and Experimental Studies on the Scattering of Lamb Waves in a Bent Plate Arief ... more Page 1. Numerical and Experimental Studies on the Scattering of Lamb Waves in a Bent Plate Arief Gunawan 1,a and Sohichi Hirose 1,b ... (ID: 66.249.72.6-24/05/11,18:17:25) Page 2. 2 2 2 2 2 2 2 2 tan( ) 4 tan( ) ( ) 0, and 0, tan( ) ( ) tan( ) 4 qh k pq qh qk ph qk ph k pq − + = + = ...

This study carries out the edge-reflection analysis of guided waves in a 3-D plate. First, we exc... more This study carries out the edge-reflection analysis of guided waves in a 3-D plate. First, we excite an incident guided wave by applying a normal traction on the surface of a 3-D plate. The excited wave field is obtained in the frequency and wavenumber domains. Secondly, we perform the edge-reflection analysis in the frequency and wavenumber domains by applying the mode-decomposition method to obtain the reflection coefficients as functions of the frequency and the wavenumber. Thirdly, the reflected waves are calculated in the frequency and wavenumber domains by using the reflection coefficients obtained in the second step. Lastly, we obtain the reflected waves in a 3-D plate by performing inverse Fourier transforms. The reflection coefficients in a 3-D plate are evaluated as the amplitude ratio between the reflected wave and the incident wave. We discuss the difference between the coefficients in 3-D and 2-D problems in detail by changing some parameters such as the size of the exciter and the distance between the exciter and the edge.

Journal of The Acoustical Society of America, 2004

This paper presents an innovative method, called the mode-exciting method, to solve Lamb wave-sca... more This paper presents an innovative method, called the mode-exciting method, to solve Lamb wave-scattering problems in an infinite plate. In this method, a set of Lamb wave modes is excited by appropriate boundary conditions given on the virtual edges of a finite plate. After solving numerically the elastodynamic problem defined in the finite domain, the numerical solution is decomposed into

Materials Transactions, 2007

This paper analyzes the edge-reflection problem of obliquely incident guided waves in a plate. Th... more This paper analyzes the edge-reflection problem of obliquely incident guided waves in a plate. The generalized guided-wave theories in a plate, including the orthogonality of modes and the mode-decomposition method are summarized. The edge-reflection problem is solved on the basis of the mode-decomposition method. Some numerical results are presented and compared to experimental results.

Engineering Analysis With Boundary Elements, 2005

... Department of Mechanical and Environmental Informatics, Graduate School of Information Scienc... more ... Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-12-1-W8-22, Ookayama, Meguro-ku, Tokyo 152-8552, Japan. Received 28 January 2005; Accepted 10 May 2005. ...

Key Engineering Materials, 2006

Page 1. Numerical and Experimental Studies on the Scattering of Lamb Waves in a Bent Plate Arief ... more Page 1. Numerical and Experimental Studies on the Scattering of Lamb Waves in a Bent Plate Arief Gunawan 1,a and Sohichi Hirose 1,b ... (ID: 66.249.72.6-24/05/11,18:17:25) Page 2. 2 2 2 2 2 2 2 2 tan( ) 4 tan( ) ( ) 0, and 0, tan( ) ( ) tan( ) 4 qh k pq qh qk ph qk ph k pq − + = + = ...

This study carries out the edge-reflection analysis of guided waves in a 3-D plate. First, we exc... more This study carries out the edge-reflection analysis of guided waves in a 3-D plate. First, we excite an incident guided wave by applying a normal traction on the surface of a 3-D plate. The excited wave field is obtained in the frequency and wavenumber domains. Secondly, we perform the edge-reflection analysis in the frequency and wavenumber domains by applying the mode-decomposition method to obtain the reflection coefficients as functions of the frequency and the wavenumber. Thirdly, the reflected waves are calculated in the frequency and wavenumber domains by using the reflection coefficients obtained in the second step. Lastly, we obtain the reflected waves in a 3-D plate by performing inverse Fourier transforms. The reflection coefficients in a 3-D plate are evaluated as the amplitude ratio between the reflected wave and the incident wave. We discuss the difference between the coefficients in 3-D and 2-D problems in detail by changing some parameters such as the size of the exciter and the distance between the exciter and the edge.

Journal of The Acoustical Society of America, 2004

This paper presents an innovative method, called the mode-exciting method, to solve Lamb wave-sca... more This paper presents an innovative method, called the mode-exciting method, to solve Lamb wave-scattering problems in an infinite plate. In this method, a set of Lamb wave modes is excited by appropriate boundary conditions given on the virtual edges of a finite plate. After solving numerically the elastodynamic problem defined in the finite domain, the numerical solution is decomposed into

Materials Transactions, 2007

This paper analyzes the edge-reflection problem of obliquely incident guided waves in a plate. Th... more This paper analyzes the edge-reflection problem of obliquely incident guided waves in a plate. The generalized guided-wave theories in a plate, including the orthogonality of modes and the mode-decomposition method are summarized. The edge-reflection problem is solved on the basis of the mode-decomposition method. Some numerical results are presented and compared to experimental results.