Accession Number:

AD0661758

Title:

A COINCIDENCE COMPUTER FOR THE ERDE RECORDING SYSTEM FOR PROPELLANT EVALUATION.

Descriptive Note:

Technical memo.,

Corporate Author:

EXPLOSIVES RESEARCH AND DEVELOPMENT ESTABLISHMENT WALTHAM ABBEY (ENGLAND)

Personal Author(s):

Report Date:

1967-08-14

Pagination or Media Count:

22.0

Abstract:

One of the requirements in the ballistic assessment of propellants is the measurement of pressure integral and time-of-burning from ignition to the end of the pressure plateau when pressure begins to fall. This period is known as action-time and was previously obtained by a mid-tangent construction on a photographic record. From a number of previous records it was established that the turnover point was a function of both time-of-burning and rate of change of pressure, i.e. for a particular motor the value of tdPdt was constant when turnover occurred. An analogue coincidence computer was designed in which the product tdPdt is monitored continuously and compared with a fixed negative value, -K, which is pre-set according to the motor being tested. When coincidence occurs tdPdt -K, an output pulse is available to operate existing equipment which then registers time-of-burning and pressure integral up to the coincidence point. Author

Subject Categories:

  • Computer Hardware
  • Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE