TY - JOUR ID - 13555 TI - Wave Motion and Stop-Bands in Pipes with Helical Characteristics Using Wave Finite Element Analysis JO - Journal of Applied and Computational Mechanics JA - JACM LA - en SN - AU - Manconi, Elisabetta AU - Sorokin, Sergey AU - Garziera, Rinaldo AU - Soe-Knudsen, Alf AD - Dipartimento di Ingegneria e Architettura, Universita degli Studi di Parma, Viale delle Scienze 181/A, 43100 Parma, Italy AD - Department of Materials and Production, Aalborg University, Fibigerstraede 16, DK-9220 Aalborg East, Denmark AD - Vestas Wind Systems A/S, Hedeager 42, DK-8200 Aarhus North, Denmark Y1 - 2018 PY - 2018 VL - 4 IS - Special Issue: Applied and Computational Issues in Structural Engineering SP - 420 EP - 428 KW - Wave propagation KW - Dispersion curves KW - Helical structures KW - Stop-bands KW - Pipes DO - 10.22055/jacm.2018.24930.1218 N2 - Pipes are widely used in many industrial and mechanical applications and devices. Although there are many different constructions according to the specific application and device, these can show helical pattern, such as spiral pipes, wire-reinforced pipes/shells, spring-suspension, and so on. Theoretical modelling of wave propagation provides a prediction about the dynamic behavior, and it is fundamental in the design process of these structures/devices and in structural health monitoring techniques. However, standard approaches have limitations in terms of difficulties in modelling and impossible computational cost at higher frequencies. In this study, the wave characteristics in waveguides with helical patterns are obtained using a Wave Finite Element (WFE) method. The method is described for a 1D and 2D waveguide with helical properties and it is illustrated by numerical examples. These include the optimization of stop-bands for a fluid-filled pipe with concentrated masses and a cylindrical structure with helical orthotropy. UR - https://jacm.scu.ac.ir/article_13555.html L1 - https://jacm.scu.ac.ir/article_13555_735b8e957892a331bb633de8b462dbfc.pdf ER -