软着陆气囊缓冲特性与参数设置的理论研究

将软着陆气囊的缓冲过程分解为绝热压缩和排气释能两个过程,从热力学和刚体动力学的基本方程出发,建立了软着陆缓冲过程的理论分析模型,并给出了缓冲响应的数值计算方法。针对立式软着陆气囊的参数设置和缓冲响应估计问题,给出了固定排气口型气囊和可控排气口型气囊相关参数的设计方法,同时以一个无人机模型的软着陆回收为例进行了缓冲响应仿真。基于简化模型及缓冲过程状态参数-时间特性曲线,分析研究了未设置排气口、固定型排气口与可控型排气口气囊的缓冲特性及其应用优劣,为工程与研究人员提供了气囊尺寸估算、缓冲系统性能预测、排气口面积选择与主动控制律设计的理论依据,研究结果具有明确的工程参考价值。

Characteristic of Intelligent Air Bag Venting Structure Actuating by Electrostrictive Stack Actuator

In this paper the conception of smart materials and structures is firstly combined with research of air bag,and the main theory of self adapting cushioning of intelligent air bag is expatiated.The intelligent venting structure is the main part affecting the cushioning result.Electrostrictive material was found having big force,high response speed and wide linearity,and it is fit to utilize in intelligent venting structure. The characteristic of the dynamic response and cushioning actuating of an electrostrictive stack actuator is analyzed,and the result of the computer simulation of the fuzzy control to intelligent venting structure is given.It is concluded that intelligent venting structure has good actuating characteristic and can satisfy the need of intelligent air bag.

一种应用于SOC芯片的线性稳压器

基于设计一种应用于SOC芯片的线性稳压器的目的,采用在误差放大器和功率管之间插入快速响应缓冲级的方法,结合单级折叠共源共栅放大电路和PMOS管功率器件,组成一种优化电路结构。通过SMIC的0.13μm工艺库进行设计仿真,结果表明,在典型条件下,输出电压为1.204 V。输入电压2.5~3.6 V时,供电电压调整率为1 mV/V。负载电流在10μA~20 mA变化,上升下降时间为1 ns时,响应时间小于1.15μs,负载调整率为19.8μV/mA,最大负载电流为20 mA。负载电容为2~100 pF,静态工作电流为6.97μA。PVT条件下,输出电压为1.2 V±1.04%。该电路各性能参数均满足设计指标要求,且结构简单,易于实现,无需片外电容,瞬时响应快,静态电流小,可为数字电路提供稳定的低压电源,具有较高应用价值。