부산대학교 도서관

Closed bomb data reduction programs traditionally use a fixed method, which means that a smoothing interval of a fixed number of pressure points is chosen and used over the entire pressure range. This paper describes a variable smoothing method which was developed to compute closed bomb burning rates. For the variable smoothing method, the smoothing interval is gradually decreased as the pressure increase. The data can be smoothed to within one point of the slivering pressure without any inaccuracies resulting from using data in that region. The variable smoothing method was used for computing burning rates for black powder and was found to be preferable over the fixed smoothing method because accurate burning rates could be obtained to much higher pressures. Also in this paper, a smoothing routine with a second-degree polynomial fit is compared to a routine with a third-degree polynomial fit. The smoothing interval of the second-degree polynomial was smaller than that of the third-degree polynomial for a smooth pressure-time curve.