NRL REPORT 5618, NAVY HIGH-IMPACT SHOCK MACHINES FOR LIGHT-WEIGHT AND MEDIUM-WEIGHT EQUIPMENT, AUTHOR: VIGNESS, I.,, NAVAL RESEARCH LABORATORY (01-JUN-1961)

NRL REPORT 5618, NAVY HIGH-IMPACT SHOCK MACHINES FOR LIGHT-WEIGHT AND MEDIUM-WEIGHT EQUIPMENT, AUTHOR: VIGNESS, I.,, NAVAL RESEARCH LABORATORY (01-JUN-1961)., Descriptions are given of the Navy HI shock machines for lightweight and mediumweight equipment. Shock motions are given for standard loading conditions. These are illustrated by acceleration-, velocity-. and displacement-time relations. Maximum values of velocities and displacements. and of accelerations passed by various low-pass filters, are presented. Shock spectra are presented for selected conditions. Equivalent displacement- and velocity-shock, together with maximum values of acceleration, can be established for their respective effective frequency ranges from observations of the shock spect ra. Concepts relative to the specification of shock tests are considered. These include brief considerations of analyses of shock motions. trethods of specifying a shock test, and what is meant by simulation of field conditions. It is indicated that shock tests should not be specified in terms of shock motions, or spectra, unless the values specified be considered only as nominal values.