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航天事业的发展以及新能源技术的开发,使得小型电动无人机在现代战争、科学研究等方面具有较高的应用价值。激光无线能量传输技术能有效解决小型电动无人机续航时间短的问题,极大提高了无人机的工作能效。以无人机激光供能系统结构原理为基础,针对小型电动无人机激光无线供能的特点,提出了一种最大功率点优化跟踪方法:即采用恒定电压法(CV法)和萤火虫算法(FA法)相结合的优化控制算法,在激光投射到无人机上的光伏电池板上后,通过对无人机激光无线充电过程中最大功率点的跟踪,提高激光利用率及充电稳定性。并且通过数值仿真,验证了所提算法的准确性和适用性。 相似文献
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关于发展“冶金内耗” 总被引:4,自引:0,他引:4
冶金内耗,旨在系统地研究钢铁等金属材料的弹性能量耗散谱,以实现内耗在冶金工业的广泛应用,研究内耗金属属性及制做过程的本质联系,以促进物理冶金学进一步向原子层发展。它是一门把滞弹性物理同金属材料及其科学发展紧密结合的应用内耗。 相似文献
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This paper discusses an in situ observation of fracture behavior around a crack tip in ferroelectric ceramics under combined
electromechanical loading by use of a moiré interferometry technique. The deformation field induced by the electric field
and the stress concentration near the crack tip in three-points bending experiments was measured. By analysis of the moiré
images it is found that under a constant mechanical load, the electric field almost has no effect on the crack extension in
the case that the directions of the poling, electric field and crack extension are perpendicular to each other. When the poling
direction is parallel to the crack extension direction and perpendicular to the electric field, the strain decreases faster
than that calculated by FEM with and without electrical loading as one goes away from the crack tip. In addition, as the electric
field intensity increases, the strain near the crack tip increases, and the strain concentration becomes more significant.
The project supported by the National Natural Science Foundation of China (10132010, 10025209, 10232023) 相似文献
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本和引入和研究一类具有弱凸图的集值映象,对这类映象证明了某些新的重合定理,最佳逼近和不动点定理。 相似文献
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介绍了一种车载大功率DC/DC电源变换器(以下简称DC/DC)的测试方法,运用V模式理念并结合半实物仿真验证测试方法对DC/DC的技术方案进行了全数字仿真验证测试、对DC/DC的控制电路部分进行了快速控制原型仿真验证测试、对DC/DC的功率电路部分进行了硬件在环仿真验证测试、对集成功率及控制电路的DC/DC进行了功率硬件在环验证测试,并根据测试结果又进行了迭代验证测试。通过半实物验证测试,对DC/DC各项设计参数的正确性及性能指标符合性进行验证测试,保证DC/DC技术方案的合理可行。 相似文献
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