液压弹射机构动力系统研究

为实现液压弹射,提出一种液压动力系统技术方案,主要由高速液压缸、活塞式蓄能器、主阀和伺服阀组成。设计了新型液压缸缓冲结构,以避免液压缸活塞运动行程末端产生强烈的撞击与振动。论述了系统工作原理和设计方法,建立了系统的数学模型,采用数字仿真的方法对弹射和缓冲过程的特性进行了理论研究,并与实验数据对比且基本吻合,结果表明:动力系统能够在 70 ms 时间内使液压缸活塞运动速度达到7 m/ s,在12 mm 液压缸活塞缓冲行程内达到95%的缓冲效率。

Research on Power System of Hydraulic Catapult Mechanism

A hydraulic power system design was proposed to achieve a hydraulic catapult, which mainly consists of a high-speed hydraulic cylinder, a piston accumulator, a main valve and a servo valve. An in- genious cylinder cushion structure was designed to avoid strong shock and vibration at the stroke end of hydraulic cylinder piston. The system working principle and design method were discussed. Then a sys- tem mathematical model was established, and the characteristics of the catapult and cushion process were further investigated through numerical simulation. Theoretical results were finally compared with the ex- perimental ones, and it was found that they are in agreement. The results show that the moving speed of hydraulic cylinder piston is up to 7 m/ s within 70 ms, and the cushion efficiency reaches 95% within 12 mm cushion stroke of hydraulic cylinder piston.