基于小波的弹性弹丸膛内引信过载研究

Research of Fuze Overload in Bore of Flexibility Pills Based on Wavelet Method

对引信膛内过载的研究,通常采用膛内压力测试的方法,利用弹底压力转换求得引信膛内过载,该方法无法体现弹丸的弹性变形、环境噪声等因素,为了更精确地描述引信膛内的过载,改进膛内引信过载测试方法,在膛内压力测试的基础上建立弹性弹丸模型,将弹丸看作两端自由的均匀等截面弹性杆,用纵向弹性变形运动过载对弹丸纵向过载进行修正,将弹丸膛内过载转换为引信膛内过载。并运用小波理论,根据自行设计的引信膛内过载直接测试方法的测试结果,建立引信高频信号库,然后利用信号库中的高频信号对修正后的过载进行加噪,从而得到能够较为真实的描述引信膛内状态的过载曲线。将处理结果与直接测试结果进行对比表明,使用该方法进行引信过载测试与直接测试方法得到的数据基本吻合,在试验成本上该方法存在优势。

The usual method for the research of fuze overload in bore is press testing in bore, and the fuze overload in bore can be achieved by changing the press under the bill bottom, but the method does not embody the factor of the pill flexibility distortion, environmental noise. For describing the fuze overload in bore more accurately, the test method of the fuze overload in bore was improved. The flexibility pill model was developed based on the press testing in bore. The pill was looked as a flexibility pole with two-terminal-free uniform equal section in the flexibility pill model and the pill portrait acceleration was amended by the portrait flexibility distortion movement acceleration, thus the fuze overload in bore could be achieved by changing the pill overload in bore. With the analysis method, the fuze high frequency signal store was developed with the testing results of direct testing method of fuze overload in bore, then the amended pill overload was carried out add-noise dispose with the high frequency signal in the store, thereby the more actual fuze overload in bore could be achieved. Taking the result of this method compare with the result of the fuze overload in bore of direct testing method, the compareision shows that the data of the fuze overload test using this method is the almost same with the direct testing method, and this method has advantage in the testing cost.