University of Tehran Press Journal of Computational Applied Mechanics 2423-6713 51 2 2020 12 01 Investigation of the effect of angle beam transducer parameters on the lamb wave field in the three–layer plate by normal mode expansion method 482 485 78642 10.22059/jcamech.2020.308282.543 EN Pezhman Taghipour Birgani Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran. 0000-0002-8311-7911 Journal Article 2020 08 16 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. https://jcamech.ut.ac.ir/article_78642_2eddef0689d94ae99015e96c40f25be4.pdf