Accession Number:

AD0483928

Title:

Ground Acceleration Measurements

Descriptive Note:

Rept. to the test director

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1953-01-01

Pagination or Media Count:

44.0

Abstract:

Maximum vertical, radial, and transverse ground accelerations induced by air blast as measured at various distances on Operation TUMBLER are reported. Self-recording accelerometers were used as a secondary measuring instrument to back up the electronically operated system. The gages were mounted at a 5 ft depth on a cube of concrete grouted into the undisturbed soil. Results indicate that a considerable part of the energy entering the ground was absorbed within the first 5 ft. In Shots 1, 2, and 3, the beginning of the Mach region was clearly defined by the difference in vertical acceleration readings between two adjacent stations. No indication of the formation of the Mach region was evident on Shot 4 as the Mach was formed before reaching the first station. Agreement between results obtained with the self-recording gages and the electronic accelerometers is within the 30 limit of error reported.

Subject Categories:

  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE