Based on analyzing the conservation of energy of penetrator with enhanced lateral efficiency （PELE） the penetrating against metal target, a theoretical expression predicting the residual velocity of PELE perforating...Based on analyzing the conservation of energy of penetrator with enhanced lateral efficiency （PELE） the penetrating against metal target, a theoretical expression predicting the residual velocity of PELE perforating the target is obtained. By modifying De Marre semi-experience formula,the ballistic limit velocities of PELE penetrating into 2024 aluminum alloy and 45# steel targets are also given. The theoretical predictions fit well with experimental or simulative results.展开更多
By changing the length-diameter ratios and inner-to-outer diameter ratios, some numerical simulations were made on PELE normal penetrating metal target using AUTODYN-3D code. The influence rules of length-diameter rat...By changing the length-diameter ratios and inner-to-outer diameter ratios, some numerical simulations were made on PELE normal penetrating metal target using AUTODYN-3D code. The influence rules of length-diameter ratio and inner-to-outer diameter ratio to the terminal effect of PELE are obtained. When the length-diameter ratio is in the range of 4-7, inner-to-outer diameter ratio is in the range of 0.54-0.72, the PELE can perform satisfactory double terminal effects embodied in armor-piercing and fragment killing. Based on simulation results, a test projectile is designed and an impact experiment of PELE is carried out, which demonstrate the efficiency of the simulation method.展开更多
提出一种Boost-LCL谐振变换器,由全桥电路、主/辅助变压器、谐振器件和一组整流桥构成。辅助变压器既是反激变压器,其原边绕组又同时复用作谐振电感和Boost电感以提高功率密度和电压增益。电路依据输出电压需求有低、高2种电压增益工作...提出一种Boost-LCL谐振变换器,由全桥电路、主/辅助变压器、谐振器件和一组整流桥构成。辅助变压器既是反激变压器,其原边绕组又同时复用作谐振电感和Boost电感以提高功率密度和电压增益。电路依据输出电压需求有低、高2种电压增益工作模式。在低电压增益模式,电路工作在定频脉冲宽度调制(pulse width modulation,PWM)模式。在高电压增益模式,电路工作在Boost+调频模式,即在全桥谐振之前加入Boost脉冲频率调制(pulse frequency modulation,PFM)以提高输出电压。与传统LCL谐振变换器相比,新电路在在同样的谐振参数下,具有更高的电压增益,更适合宽输出范围使用。详细分析了新拓扑的工作原理,并与传统拓扑进行了对比分析。研制了一台100～150V输出的样机,测试表明在宽输出范围内,新拓扑效率最高可达93.1%,验证了理论分析的正确性。展开更多
文摘Based on analyzing the conservation of energy of penetrator with enhanced lateral efficiency （PELE） the penetrating against metal target, a theoretical expression predicting the residual velocity of PELE perforating the target is obtained. By modifying De Marre semi-experience formula,the ballistic limit velocities of PELE penetrating into 2024 aluminum alloy and 45# steel targets are also given. The theoretical predictions fit well with experimental or simulative results.
文摘By changing the length-diameter ratios and inner-to-outer diameter ratios, some numerical simulations were made on PELE normal penetrating metal target using AUTODYN-3D code. The influence rules of length-diameter ratio and inner-to-outer diameter ratio to the terminal effect of PELE are obtained. When the length-diameter ratio is in the range of 4-7, inner-to-outer diameter ratio is in the range of 0.54-0.72, the PELE can perform satisfactory double terminal effects embodied in armor-piercing and fragment killing. Based on simulation results, a test projectile is designed and an impact experiment of PELE is carried out, which demonstrate the efficiency of the simulation method.
文摘提出一种Boost-LCL谐振变换器,由全桥电路、主/辅助变压器、谐振器件和一组整流桥构成。辅助变压器既是反激变压器,其原边绕组又同时复用作谐振电感和Boost电感以提高功率密度和电压增益。电路依据输出电压需求有低、高2种电压增益工作模式。在低电压增益模式,电路工作在定频脉冲宽度调制(pulse width modulation,PWM)模式。在高电压增益模式,电路工作在Boost+调频模式,即在全桥谐振之前加入Boost脉冲频率调制(pulse frequency modulation,PFM)以提高输出电压。与传统LCL谐振变换器相比,新电路在在同样的谐振参数下,具有更高的电压增益,更适合宽输出范围使用。详细分析了新拓扑的工作原理,并与传统拓扑进行了对比分析。研制了一台100～150V输出的样机,测试表明在宽输出范围内,新拓扑效率最高可达93.1%,验证了理论分析的正确性。
