Ferhat Kadioglu and Ahmet Reha Gunay
Reliable Damping Measurements of Solid Beams with Special Focus on the Boundary Conditions and NonContact Test SetUps
217 - 224
2023
17
5
International Journal of Aerospace and Mechanical Engineering
https://publications.waset.org/pdf/10013099
https://publications.waset.org/vol/197
World Academy of Science, Engineering and Technology
Correct measurement of a structural damping value is an important issue for the reliable design of the components exposed to vibratory and noise conditions. As far as a vibrating beam technique is concerned, the specimens under the test somehow are interacted with measuring and exciting devices and also with boundary conditions of the test setup. The aim of this study is to propose a vibrating beam method that offers a noncontact dynamic measurement of solid beam specimens. To evaluate possible effects of the clamped portion of the specimens with clampedfree ends on the dynamic values (damping and the elastic modulus), the same measuring devices were used, and the results were compared to those with the freefree ends. To get clear idea about the sensitivity of the boundary conditions to the damping values at low, medium and high levels, representative materials were subjected to the tests. The results show that the specimens with low damping values are especially sensitive to the boundary conditions and the most reliable structural damping values are obtained for the specimens with freefree ends. For the damping values at the low levels, a deviation of about 368 was obtained between the specimens with freefree and clampedfree ends, yet, for those having high inherent damping values, comparable results were obtained.
Open Science Index 197, 2023