Novel Dispersion Curves Extraction Method for Waveguides Affected by Nonuniform Transient Temperature Field

摘要: Guided waves sensitivity to environmental and operational conditions, especially temperature fluctuations, is one of the major problems when method considered for real engineering applications. The aim this paper propose a novel dispersion curves extraction waveguides affected by nonuniform transient field. Essentially, based on simple robust approach, consisting in few series modal analyses representative part inspected structure. To consider effect temperature, thermal stress calculation finite element presented. In way, different wave lengths, mode shapes corresponding natural frequencies can be obtained solving some thermal-eigenvalue problems. test theoretical experiment an isotropic plate conducted. Those curves, only dominant modes, are compared with from experiment. Finally, used extract aero-engine casing considering results not give us insight how affects Lamb velocities frequency ranges but also will help those extracting