摘要
舰艇冲击响应具有明显的非平稳与非线性特征,传统的Fourier变换分析应用受限。文章利用短时Fourier变换(STFT)分析技术研究冲击响应的时频变化特征,计算结果证明了该分析方法可比较精确地描述舰艇船体结构与舰用设备冲击响应频率特性随时间的演化特征。该研究成果可以为舰艇抗冲击指标细化分析与极限冲击载荷研究提供技术支持。
The course of shock response of warship cannot be exactly analyzed by traditional Fourier trans- form because of its obvious character of non-stationary and non-linearity. In this paper, the short time Fourier transform （STFT） is used to analyze the time-frequency variation of impact response. This method can exactly represent the frequency evaluative character of impact response of the shipbuilding structure and ship＇s equipment. The results of this study can provide the technical support for the detailed analy- sis of warship anti-shock rule and the investigation of limit impact load.
出处
《船舶力学》
EI
CSCD
北大核心
2013年第1期141-147,共7页
Journal of Ship Mechanics
基金
国家自然科学基金资助项目(51109219)
关键词
舰艇
冲击响应
时频变化特征
船体结构
舰用设备
短时Fourier变换
warship
impact response
time-frequency varying character
shipbuilding structure
ship equipment
short time Fourier transform
