中国舰船研究2016，Vol.11Issue(2)：27-32,50,7.DOI:10.3969/j.issn.1673-3185.2016.02.005
水下爆炸条件下自由场压力载荷时频特征分析
Time-frequency characteristics analysis of free-field pressure with underwater explosion
摘要
Abstract
To obtain the characteristics of the free-field pressure with underwater explosion, the time-fre⁃quency characteristics of the monitored free-field pressure signals are studied through wavelet analysis, based on the experimental free-field pressure data subjected to underwater explosion. By using these sig⁃nals, the pressure-time curves and the energy distributions in different blasting frequency bands are ob⁃tained. The result shows that the obtained time-frequency characteristics of free-field pressure can be used to generate the shock wave signal, the after flow signal, and the second pressure pulse, and by analyzing the energy and frequency component, it is easy to get the detailed time-frequency information of the free-field pressure signal intensity, frequency and duration. More than 90% of the energy of the shock wave pressure signals condenses in the band lower than 8 kHz, and the highest level of energy appears below the frequen⁃cy of 4 kHz, and special attention should be directed to the low frequency band below 250 Hz of the after flow signal as well as the second pressure pulse for ship structure and equipment. Overall, this paper pro⁃vides reference for shock-resistance analysis of the ship structure.关键词
水下爆炸/小波分析/时频特征/自由场压力Key words
underwater explosion/wavelet analysis/time-frequency characteristics/free-field pressure分类
交通工程引用本文复制引用
谢耀国,崔洪斌,李新飞,姚熊亮..水下爆炸条件下自由场压力载荷时频特征分析[J].中国舰船研究,2016,11(2):27-32,50,7.基金项目
国家自然科学基金资助项目（51279038）；国家级重大基础研究项目 （）
