针对频率分集阵列(Frequency Diverse Array,FDA)方向图中固有的距离-角度耦合给波束控制带来的问题,本文通过遗传算法解算FDA阵列的非线性-时变频偏。首先,通过采用非线性频控函数实现FDA方向图解耦。在此基础上,将现有文献中线性增量...针对频率分集阵列(Frequency Diverse Array,FDA)方向图中固有的距离-角度耦合给波束控制带来的问题,本文通过遗传算法解算FDA阵列的非线性-时变频偏。首先,通过采用非线性频控函数实现FDA方向图解耦。在此基础上,将现有文献中线性增量-时变频偏表达式推广为适用于倒数等非线性频控函数的形式。之后,针对无法得到固定时变频偏表达式的log-FDA及sin-FDA阵列,应用遗传算法通过凸优化求解,同时在约束条件中添加脉冲持续时间约束,从而得到主瓣增强旁瓣抑制的FDA非时变解耦方向图,在脉冲周期内形成固定的波束指向,有效改善因目标照射时间不足导致回波能量低的问题。最后,仿真验证了本文结论的正确性。展开更多
Based on the theories of hydraulics and nonlinear control system, the model of hydroviscous drive (HVD) was established, the influences of small ripple of control oil pressure on the output speed of HVD and the stabil...Based on the theories of hydraulics and nonlinear control system, the model of hydroviscous drive (HVD) was established, the influences of small ripple of control oil pressure on the output speed of HVD and the stability of oil film between friction disks were analyzed. The conclusion presents that when the frequency of the control oil's pressure ripple is higher than 60?Hz and the peak is less than 0 05?MPa, HVD can work stably. The result is useful for studying the application of frequency conversion technology in regulation of control oil pressure.展开更多
文摘针对频率分集阵列(Frequency Diverse Array,FDA)方向图中固有的距离-角度耦合给波束控制带来的问题,本文通过遗传算法解算FDA阵列的非线性-时变频偏。首先,通过采用非线性频控函数实现FDA方向图解耦。在此基础上,将现有文献中线性增量-时变频偏表达式推广为适用于倒数等非线性频控函数的形式。之后,针对无法得到固定时变频偏表达式的log-FDA及sin-FDA阵列,应用遗传算法通过凸优化求解,同时在约束条件中添加脉冲持续时间约束,从而得到主瓣增强旁瓣抑制的FDA非时变解耦方向图,在脉冲周期内形成固定的波束指向,有效改善因目标照射时间不足导致回波能量低的问题。最后,仿真验证了本文结论的正确性。
文摘Based on the theories of hydraulics and nonlinear control system, the model of hydroviscous drive (HVD) was established, the influences of small ripple of control oil pressure on the output speed of HVD and the stability of oil film between friction disks were analyzed. The conclusion presents that when the frequency of the control oil's pressure ripple is higher than 60?Hz and the peak is less than 0 05?MPa, HVD can work stably. The result is useful for studying the application of frequency conversion technology in regulation of control oil pressure.
