چکیده مقاله
The Multi Scale Technique MTS has been successful in this respect and has been able to explain the lamb waves generated in the steel beam The result achieved through the analysis of the STFT algorithm confirmed that the variation of the dynamics involved is dependent on the variation of the sensors' distance to each other, irrespective of the values of the spectral frequencies The experiment revealed that there is a direct proportion between time of flight and the sensors' distance furthermore, it is proven that the group velocity is independent of the position of the sensors, and hence the hypothesis that the Dispersion Effect value will be ignored is verified This is the reason why the proposed method that has been identified and discussed in this article is bound to prove its validity and usability to the ultrasonic structural health monitoring technique because of its capability to produce genuine models based on the wave propagation and attenuation Analyzing the result of STFT output, it is understood that as the propagation interval increases, the direct relationship between the spreading levels of the lamb wave packets in the time frequency domain is observed It is understood that when the value of the correction terms expressed in terms of ε² and ε³ are smaller, the value of dispersion is smaller
کلیدواژهها
نویسندگان
Fateme Imani
Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
Mahnaz Shamshirsaz
New Technologies Research Center, Amirkabir University of Technology, Tehran, Iran
Mohammad Mohammadi Aghdam
Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
شیوه ارجاع
Imani, Fateme and Shamshirsaz, Mahnaz and Mohammadi Aghdam, Mohammad,1404,Multi-scale analysis of Lamb wave propagation in a steel beam excited and sensed by piezoelectric transducers,1st International & 7th National conference on Mechanical-civil engineering and advanced technologies,Esfarayen
ارائهشده در
مجموعه مقالات اولین کنفرانس بین المللی و هفتمین کنفرانس ملی مهندسی مکانیک، عمران و فناوری های پیشرفته19 آبان 1404 · اسفراین