naa a22 4500 510822460 CHVBK 20180411083540.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s12541-013-0224-6 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0224-6 Damping ratios of pristine composite beam and constrained layer damped composite beam of equal stiffness [Elektronische Daten] [Ramadas Chennamsetti, Avinash Hood, Siddlingappa Guruprasad, Sajal Roy, Makarand Joshi] Constrained layer damping is one of the passive techniques to control amplitude of vibration of structural components. In the present work an attempt has been made to quantify and compare damping ratios of composite-rubber-composite sandwich beam with that of pristine composite beam having nearly the same flexural stiffness and range of frequency of vibration from 20 Hz to 100 Hz. Length and thickness of sandwich and pristine beams in order to have the same flexural stiffness and desired frequency range of vibration were specifically designed. The damping ratio of each sandwich and pristine composite beams were measured experimentally using logarithmic decay and half-power bandwidth techniques. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 Constrained layer damping nationallicence Composite-rubber-composite nationallicence Flexural stiffness nationallicence Damping ratio nationallicence t c : thickness of composite nationallicence t b : thickness of rubber nationallicence t : total thickness of the beam nationallicence b : width of the beam nationallicence w t : total vertical deflection nationallicence w b : vertical deflection due to bending nationallicence w s : vertical deflection due to shear deformation nationallicence P : point load nationallicence E : Young's modulus nationallicence E r : Young's modulus of rubber nationallicence E c : Young's modulus of composite nationallicence G : Shear modulus nationallicence υ : Poisson's ratio nationallicence L : length of the beam nationallicence A : cross-sectional area of the beam nationallicence α s : shear correction factor nationallicence I : area moment of inertia nationallicence G eq : equivalent shear modulus nationallicence G r : shear modulus of rubber nationallicence G c : shear modulus of composite nationallicence z : distance measured from neutral axis nationallicence k CRC : flexural stiffness of sandwich beam nationallicence ω : circular frequency nationallicence f : frequency nationallicence ρ : density nationallicence A n : amplitude at time n nationallicence A n + 1 : amplitude at time n+1 nationallicence ξ : damping ratio nationallicence Q : quality factor nationallicence f 1 : lower frequency nationallicence f 2 : upper frequency nationallicence Chennamsetti Ramadas Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut Hood Avinash Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut Guruprasad Siddlingappa Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut Roy Sajal Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut Joshi Makarand Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut International Journal of Precision Engineering and Manufacturing Springer Berlin Heidelberg 14/9(2013-09-01), 1655-1660 2234-7593 14:9<1655 2013 14 12541 https://doi.org/10.1007/s12541-013-0224-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0224-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chennamsetti Ramadas Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut NATIONALLICENCE 700 1- Hood Avinash Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut NATIONALLICENCE 700 1- Guruprasad Siddlingappa Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut NATIONALLICENCE 700 1- Roy Sajal Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut NATIONALLICENCE 700 1- Joshi Makarand Composites Research Center, R & D E (E), Alandi Road, 411 015 (Zip code), Dighi, Pune, India aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Springer Berlin Heidelberg 14/9(2013-09-01), 1655-1660 2234-7593 14:9<1655 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer