%0 Journal Article %T Investigation of the effect of angle beam transducer parameters on the lamb wave field in the three–layer plate by normal mode expansion method %J Journal of Computational Applied Mechanics %I University of Tehran %Z 2423-6713 %A Taghipour Birgani, Pezhman %D 2020 %\ 12/01/2020 %V 51 %N 2 %P 482-485 %! Investigation of the effect of angle beam transducer parameters on the lamb wave field in the three–layer plate by normal mode expansion method %K Angle Beam Transducer %K Three-Layer Plate %K Attenuation %K Lamb Wave %K Normal Mode Expansion %R 10.22059/jcamech.2020.308282.543 %X The effect of angle beam transducer parameters such as wedge angle and width transducer on the Lamb wave field generated in the elastic-viscoelastic three-layer plate has been investigated using normal mode expansion method. At first, the propagation of Lamb wave in the three-layer plate has been investigated using global matrix method, and all the modes that are propagated in the three-layer plate have been specified. Then, the optimum parameters of angle beam transducer have been obtained to generate a mode with minimum attenuation at a specific frequency. In addition to this mode, other modes are also generated in the three-layer plate, but this mode has maximum energy in the three-layer plate. The results indicate that the energy contribution of the mode with minimum attenuation at a specific frequency is 99.9% of the total energy and this mode has the highest energy contribution. %U https://jcamech.ut.ac.ir/article_78642_d6c83a88baeff2b1e9f2a7e677f0b4a2.pdf