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The structural-acoustic coupling model for isotropic thin elastic plate was extended to honeycomb sandwich plate (HSP) by applying Green function method. Then an equivalent circuit model of the weakly-strongly coupled system was proposed. Based on that, the estimation formulae of the coupled eigenfrequency were derived. The accuracy of the theoretical predictions was checked against experimental data, with good agreement achieved. Finally, the effects of HSP design parameters on the system coupling degree, the acoustic cavity eigenfrequency, and sound pressure response were analyzed. The results show that mechanical and acoustical characteristics of HSP can be improved by increasing the thickness of face sheet and reducing the mass density of material. 相似文献
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为了减小连杆衬套强力旋压成形的圆柱度误差和壁厚偏差,提出了基于加权相对距离的最优解决策策略.介绍了连杆衬套的强力旋压成形工艺,以减小圆柱度误差和壁厚偏差为目标建立了多目标优化模型.使用RBF神经网络和有限元仿真软件拟合了工艺参数与目标参数之间的函数关系,经验证RBF神经网络的拟合精度较高.使用非支配排序遗传算法对多目标... 相似文献
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柴油机尾气排放口在红外仪器的探测下呈现喷射状尾焰,使移动电站具有很强的暴露征候,极不利于部队的作战安全。通过查阅资料及对比实验,对柴油机尾气的红外图像成因进行深入浅出的分析。该研究在移动电站柴油发电机组尾气的红外暴露征候问题的解决方面具有一定的导向性作用。 相似文献
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分析了军用计算机机房电磁泄露的主要途径和电磁干扰、电磁脉冲对计算机系统的危害.针对计算机机房存在的这些电磁防护问题,对计算机房的整体电磁防护措施进行了探讨,并重点介绍了机房内的墙体、门、窗、孔洞、管线等关键部位的电磁防护措施;综合采用这些电磁防护措施,对提高我军军用计算机在恶劣战场电磁环境中的生存能力和作战效能具有重要的现实意义. 相似文献
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