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基于混沌振子的低信噪比条件下信号检测研究 总被引:2,自引:0,他引:2
介绍了混沌系统检测弱信号方法,结合自相关方法和滤波方法得到了弱信号检测的新方法——联合检测方法,给出了该检测方法一般模型,定性分析了噪声和干扰对系统检测的影响,仿真实验说明了所给方法对弱信号非常敏感,检测性能比单纯混沌系统检测性能优越。 相似文献
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Based on the analysis of the high temperature decomposition of oxydal(H2O2)and the combustion of diesel engine,the effects of H2O2 on the improvement of diesel combustion were studied.An oxydal spray system was designed to inject H2O2/water mixture into the manifold.The experiment was carried out on a 1135 diesel engine bench.The results show that H2O2 injection can make the curve of heat release rate move forward and decrease its peak value.The specific fuel consumption is decreased a little,while both NOx... 相似文献
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Reducing the self-noise and radiated noise of torpedo is an effective way to enhance its detection and concealment capabilities.After discussing the basic principle on noise and vibration control and main noise sources in torpedo,the application of damping treatment for noise and vibration absorption was proposed in this paper.Compared composite materials(damping and metal materials)used as segment joint,their different contributions to the damping performance of base structure were investigated.The results show that the damping material can be used as segment joint effectively in vibration control.Taking cantilever beam as an example,four different damping treatments were compared in natural frequency and damping loss factor,the results show the influences of different damping layer layouts on the structure damping performance,and offer a reference for the torpedo shell design. 相似文献
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通过数据拟合得出不同质量动能弹对应的 p -t 曲线及函数关系式,给出动能弹质量与最大膛压 m -pm 曲线及函数式,研究结果表明,动能弹质量主要影响膛压的最大值且在一定范围呈指数关系,研究结果可以为指定膛压下动能弹质量确定提供参考。 相似文献
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为了分析射程检验理论中存在的缺陷,根据系统误差与射程真值的关系,推导了系统误差在检验统计量中的传递方式,得到了检验统计量中存在的系统误差的干扰项,建立了包含误差干扰的统计量计算式。计算结果表明,样本量越大则系统误差干扰越大,增大样本量能引起检验结论变为拒绝原假设。在计算多种样本量、多种系统误差幅度的抽样结果的检验统计量值的基础上进行对比分析,结果表明:样本量越大则系统误差产生的干扰越强; 假设检验仅能在样本量较小的时候谨慎应用,并且在应用中必须关注系统误差的幅度及其产生的干扰的强度。 相似文献
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导弹由于功能和装配的需要,一般是由多个舱段组成,其连接部分的刚度下降将导致弹体固有频率和振型的变化。文中采用一维梁模型,研究了导弹弹体模态对其刚度分布的敏感程度,并在此基础上对于多连接面情况进行了分析。研究结果对导弹连接部件的设计和位置安排具有一定的指导意义。 相似文献