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基于双重判断策略的自适应WPT窄带干扰抑制方法 被引量:2
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作者 孟生云 杨文革 王东辉 《遥测遥控》 2013年第4期45-52,共8页
针对自适应小波包变换干扰抑制方法对窄带干扰频率敏感的问题,提出基于双重判断策略的改进抑制方法。方法在分解过程中同时对父节点及其两子节点的能量聚焦度进行判断,极大地降低了对节点是否继续分解的误判,可有效跟踪定位窄带干扰。... 针对自适应小波包变换干扰抑制方法对窄带干扰频率敏感的问题,提出基于双重判断策略的改进抑制方法。方法在分解过程中同时对父节点及其两子节点的能量聚焦度进行判断,极大地降低了对节点是否继续分解的误判,可有效跟踪定位窄带干扰。仿真结果表明,改进的自适应小波包变换干扰抑制方法克服了原方法对窄带干扰频率敏感的缺点,提高了抑制方法的鲁棒性。 展开更多
关键词 扩频测控 小波包变换 干扰抑制 能量聚焦度
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Energy convergence effect and jet phenomenon of shock-heavy spherical bubble interaction 被引量:1
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作者 ZOU LiYong ZHAI ZhiGang +2 位作者 LIU JinHong WANG YanPing LIU CangLi 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第12期180-186,共7页
We present computational results on the evolution of the shock-accelerated heavy bubbles surrounded by nitrogen with the Atwood number At = 0.497–0.677 and the emphasis is on the jet phenomenon caused by the shock fo... We present computational results on the evolution of the shock-accelerated heavy bubbles surrounded by nitrogen with the Atwood number At = 0.497–0.677 and the emphasis is on the jet phenomenon caused by the shock focusing. The multi-fluid Eulerian equation is solved by a finite volume method based on MUSCL-Hancock approach. Based on the numerical schlieren and the distributions of density and pressure, it is found that there are three typical jet structures(outward jet, no jet, inward jet) for different combinations of gas mixture inside the bubble which determine the position of shock focusing relative to the downstream pole of the heavy bubble(upstream of the pole, at the pole, downstream the pole). Compared with the inward jet, the velocity of outward jet is obviously larger. As At increases, the moment of jet formation is postponed, and the maximal values and magnifications of pressure and density increase distinctly. Therefore, the energy convergence effects are heavily enhanced with the increase of bubble gas density. 展开更多
关键词 shock-heavy bubble interaction energy convergence JET
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