USA as Represented by Secretary of the Navy

Christa M Reise

James C Butts

A calibrated stop bolt is provided for measuring the dynamic load transmitted to the calibrated stop bolt during a shock test. The stop bolt includes an anterior extension and a posterior extension, for restraining a torpedo bearing plate therebetween, and also includes a plurality of strain gauges mounted at the top portion of each extension. In one embodiment, eight strain gauges are utilized, with two strain gauges placed on each side of the two extensions, i.e., in a full bridge arrangement. The calibrated stop bolt is preferably mounted to a base plate and bolted at each end to a longitudinal test fixture. The calibrated stop bolt can be utilized with a conventional longitudinal shock test fixture, torpedo shape and heavy weight shock machine.

Calibrated stop bolt for longitudinal shock test fixture

The present invention relates to a method for generating 2 and 3-dimensional fluid meshes for structural/acoustic finite element analysis in an infinite medium. The method broadly comprises the steps of: enclosing a structure to be analyzed in a block of fluid; determining a bias factor and coordinates for the mesh; and generating at least one of a two dimensional and a three dimensional mesh using the coordinates and the bias factor.

Method for generating 2 and 3-dimensional fluid meshes for structural/acoustic finite element analysis in infinite medium

A system for shock hardening the nose fairing bearing plate assembly of a rpedo by controlling the deformation of the bearing plate under shock loads. A stop bolt within a torpedo tube engages the bearing plate to prevent relative movement between the torpedo tube and the torpedo and to transfer loads between the torpedo housing and the torpedo tube. The system includes providing a tang on the bearing plate to increase bending resistance of the plate and provide a bearing surface which more directly transfers loads from the stop bolt through the bearing plate and into the housing. Additionally, a relief slot is machined into the bearing plate to ensure the bearing plate deforms towards the torpedo and does not interfere with retraction of the torpedo from the tube. Finally, a nose fairing restraint prevents the nose fairing from rotating above the plane of the bearing plate when the deformation of the plate prevents the bearing plate from engaging the nose fairing.

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Portsmouth, RI, United States of America

Christa M Reise