Application of High-speed Solenoid Valve to the Semi-active Control of Landing Gear

To select or develop an appropriate actuator is one of the key and difficult issues in the study of semi-active controlled landing gear. Performance of the actuator may directly affect the effectiveness of semi-active control. In this article, parallel high-speed solenoid valves are chosen to be the actuators for the semi-active controlled landing gear and being studied. A nonlinear high-speed solenoid valve model is developed with the consideration of magnetic saturation characteristics and verified by test. According to the design rule of keeping the peak load as small as possible while absorbing the specified shock energy, a fuzzy PD control rule is designed. By the rule controller parameters can be self-regulated. The simulation results indicate that the semi-active control based on high-speed solenoid valve can effectively improve the control performance and reduce impact load during landing.

基于脉宽调制式CNG高速电磁阀驱动性能分析

针对CNG高速电磁阀驱动性能问题,提出基于脉宽调制的方法并进行试验分析。结果表明:该驱动电路能够实现高压打通低压保持喷射的功能,符合喷射规律;可得出驱动电压、PWM的周期、PWM的占空比都将对电磁阀的驱动能力以及维持喷射能力产生不同的影响,3者的有机调节可实现理想的电流波形。

天然气发动机喷气电磁阀混合型驱动电路的研制

针对广泛使用的天然气发动机喷气电磁阀工作特点,设计了一种能够兼容电压型电磁阀、电流型电磁阀的混合型驱动电路。在驱动电流型电磁阀时为了减小驱动时的功耗,提供较大的启动力,采用在启动时提供较大的工作电流,使电流型电磁阀快速动作,之后,提供较小的工作电流以维持。同时在驱动电压型电磁阀时,电路也能够正常的工作。本设计可以达到混合喷气电磁阀所必需的性能特点。

气动先导式高压电磁阀的动态特性仿真研究

对先导结构和主阀芯设计为一体的先导式高压电磁阀进行了仿真分析。根据牛顿第二定律建立该电磁阀的运动方程;针对该阀电磁模块的特点,建立电磁铁的动态模型;以固定容积同时充放气模型为基础,建立气隙腔压力变化微分方程;以电磁阀运动方程为基础,运用Matlab/Simulink实现了具有两段位移的先导式高压电磁阀的动态特性仿真分析。仿真结果表明:对电磁阀气路中的气隙腔模块进行优化,可提高先导小孔泄压过程中压力平衡的建立速度,从而提高电磁阀响应速度。