Journal of Theoretical and Applied Vibration and Acoustics

Journal of Theoretical and Applied Vibration and Acoustics

Experimental identification of parameters of joint affected region of under platform damper

Document Type : H. Ahmadian Prize

Authors
Shayan Eini 1
Mehrdad Motavasselolhagh 2
Majid Rajabi 3
1 M.Sc. Student, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IRAN
2 Ph.D. Student, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IRAN
3 Associate Professor, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IRAN
10.22064/tava.2023.563667.1214
Abstract
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.

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.

Highlights

  • Properties of the surfaces in the dampers under the wedge-shaped platform are identified.
  • Finite element model optimization is performed to reduce execution time.
  • Natural frequencies of the dampers under the wedge-shaped platform are measured.
  • FE models are updated through eigen-sensitivity analysis of natural frequencies.

Keywords
System identification
Joint affected region
Model updating
Under platform damper
Friction and contact
Subjects
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Journal of Theoretical and Applied Vibration and Acoustics
Volume 8, Issue 1
January 2022
Pages 13-25