Iranian Society of Acoustics and Vibration and Avecina Journal of Theoretical and Applied Vibration and Acoustics 2423-4761 8 1 2022 06 25 Experimental identification of parameters of joint affected region of under platform damper 13 25 715157 10.22064/tava.2023.563667.1214 EN Shayan Eini M.Sc. Student, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IRAN Mehrdad Motavasselolhagh Ph.D. Student, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IRAN Majid Rajabi Associate Professor, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IRAN Journal Article 2021 10 18 The primary objective of this research is to identify the physical and geometrical properties of the joint-affected region in under-platform dampers and minimize errors caused by the selection of the contact surface type by updating the connection properties. Additionally, an optimized model is proposed for selecting the type of finite elements to reduce execution time using system simulation in finite element software. The experimental test has been done on the three-dimensional model of two blades with the under-platform damper in a free-free manner, and the behavior of the joint-affected region has been optimized according to the results extracted from the experimental test. Three types of affected regions, rectangular and ellipsoidal, and two pieces shapes, are considered in five different dimensions to obtain the best model and dimensions of the affected surface. <br /><br />The results demonstrate that the ellipsoidal model yields simulation results that are closer to the experimental test results with lower error. Moreover, reducing the dimensions of the affected surface to the center of the effect provides more accurate results. These findings have significant implications for improving the performance of under-platform dampers and reducing vibrations in mechanical structures. https://tava.isav.ir/article_715157_d68bee7f1229f4350acdb5ceb0649897.pdf