برآورد بسامدها و اشكال مودي سدهاي خاكي مسجد سليمان و مارون با استفاده از روش هاي كلاسيك و پيشرفته ي پردازش سيگنال

EVALUATING MODAL FREQUENCIES AND MODE SHAPES OF MASJED SOLEIMAN AND MARUN EMBANKMENT DAMS USING CLASSICAL AND ADVANCED SIGNAL PROCESSING TECHNIQUES

In this paper, the dynamic characteristics of two Iranian large embankment dams in explosion tests will be pre¬sented. Based on the results of the tests, the recorded velocity time histories of the dam bodies in 12 explo¬sions at the Masjed Soleiman dam site and 7 explosions at the Marun dam site were measured. Since the in¬put excitations are unknown, the modal frequencies and mode shapes of the dams were evaluated based on the i;4 spectra*ʹ method. Due to non-stationary characteristics of recorded signals and in order to increase the accuracy of calculations, an advanced signal processing method, named Time-Frequency Distribution (TFD), was used. In this paper, the obtained results and a comparison be¬tween classical and advanced signal processing methods will be presented.