LAUSR

Abstract In this study, the acoustical and vibrational effects of radiating ultrasound waves to the human aorta is investigated. The aortic segment, which is composed of three distinct layers of tunica intima, tunica media and tunica adventitia, is modeled by a thick laminated composite cylindrical shell. The vibro-acoustic response of the aorta, which includes the amplitude of vibration in the longitudinal, circumferential and radial directions and the amplitude of the transmitted wave, under the acoustic excitation is obtained using the first order shear deformation theory. The maximum amount of acoustical energy that transmits through the aortic wall occurs in the range of frequencies between 10 kHz and 1 MHz. the results show two resonance phenomena in the audible range of frequencies from 100 Hz to 20 kHz with excessive vibrations of the aortic wall in the circumferential and longitudinal directions. However, the radial motion becomes dominant by increasing the frequency in the ultrasound range of frequencies from 100 kHz to 10 MHz.