Experimental identification of parameters for joint affected region in an under-platform damper

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 element 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.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.