Further understanding of doorway states in elastic systems

J A Otero; G Monsivais; A Morales; L Gutiérrez; A Díaz-de-Anda; J Flores

doi:10.1121/1.4996500

Further understanding of doorway states in elastic systems

J Acoust Soc Am. 2017 Aug;142(2):646. doi: 10.1121/1.4996500.

Authors

J A Otero¹, G Monsivais², A Morales³, L Gutiérrez³, A Díaz-de-Anda⁴, J Flores²

Affiliations

¹ Tecnológico de Monterrey, Campus Estado de México, Atizapán de Zaragoza, 52926 Estado de México, Mexico.
² Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-364, 01000 Ciudad de México, Mexico.
³ Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251 Cuernavaca, Morelos, Mexico.
⁴ Instituto de Física, Benemérita Universidad Autónoma de Puebla, P.O. Box J-48, 72570 Puebla, Puebla, Mexico.

PMID: 28863612
DOI: 10.1121/1.4996500

Abstract

In a previous work an elastic bar with a groove or notch that presents a doorway state was studied when the system was excited with 20 cycles of harmonic signals. The strength function had a Lorentzian width Γ_d = 1/πτ_d, where τ_d is the decay time of the prompt response. In the present paper, the doorway-state phenomenon is analyzed again for the same harmonic signals but for a very large number of cycles. The strength-function phenomenon is once more obtained, but now with a Lorentzian width Γ^' which is larger than Γ_d. A qualitative and numerical explanation of this fact is given, leading therefore to further understanding of doorway states in elastic systems. The numerical results show a very good agreement with the values measured in the laboratory.

Publication types

Research Support, Non-U.S. Gov't