Seshadri, T. V. | Search NASA

NASA NTRS1972

Establishing an upper bound for window response to the sonic boom.

Study of the failure of glass windows, which is probably the most severe problem confronting the SST program outside of the psychological and sociological aspects. The structural configuration most likely to suffer a window failure due to sonic boom excitation is one representable by a single large room, a single large window, and an open door. It is suggested that if the open door were replaced with another window the resultant stresses in both windows would be substantially reduced.

Seshadri, T. V.↗

NASA NTRS1972

Low frequency damping mechanisms in mechano-acoustical networks.

The response of a panel or window to the sonic boom and to other transient loads can often be found by deriving an equivalent lumped parameter model for the structure. The maximax response of such a mechano-acoustical system depends strongly upon the damping mechanisms of the components. This paper is concerned with finding realistic values for the lower bounds of the damping mechanisms in various mechano-acoustical systems. The results indicate that although part of the damping consists of radiation losses at openings, and radiation and viscous losses at narrow interconnecting hallways, the structural damping of the panel is of primary concern.

Seshadri, T. V.↗