Dynamic Analysis of the Safing and Arming System for PD Fuze M572E2
Abstract
This report covers the investigation of those factors which caused the duds experienced in low-zone firings of 155 mm and 8-inch howitzers during the service tests of PD fuze M572E2 in July 1972. In addition to diagnostic testing, the investigation included analytical programs by AVCO Systems Division and Honeywell, Inc. The AVCO program was a lumped-parameter (equivalent spring- mass systems) analysis of both the complete 8-inch round and pertinent fuze components for axial component motion. The Honeywell program was an investigation of the dynamics of various setback-pin designs during the firing cycle. Evaluation of the test results and analytical programs indicated that the problem was due to the S and A setback pin re-engaging the rotor, thus preventing arming. A number of design changes, made to delay the return of the setback pin and dampen its rebounding, were successfully tested. Most significantly, the setback pin was redesigned and the center of gravity lowered; both the length and diameter of the cavity were increased and the ramp angle was made more abrupt, and flat, energy-absorbing material was put into the base of the setback-pin cavity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1976
- Accession Number
- ADB012378
Entities
People
- Edwin B. Entin
Organizations
- Picatinny Arsenal