“长征”二号F型火箭还首次研制了全冗余的控制系统,实现双套制导与稳定控制技术,其中双CPU计算机、三余度伺服机构和双回路稳定平台技术均达到国际先进水平。从发射“神舟”三号开始全面覆盖系统的冗余控制大大提高了运载火箭的可靠性,为实现载人奠定了基础。
The long march 2F rocket has also developed a fully redundant control system for the first time to realize dual guidance and stability control technology, among which dual CPU computer, three redundancy servo mechanism and dual loop stability platform technology have reached the international advanced level. The redundancy control of the full coverage system since the launch of Shenzhou-3 has greatly improved the reliability of the launch vehicle and laid the foundation for the realization of manned launch.
为保证火箭高可靠性和高安全性,火箭电器系统就有近4万个元器件。所有元器件都经过了筛选和40多个回合的增长试验,不仅要在模拟飞行环境下达到设计指标,而且在此基础上要有裕度。比如,从火箭发射到飞船入轨只有短短的600秒,但火箭的可靠性增长试验却达到了546小时。这样,就使“长征”二号F型火箭的可靠性指标达到0。97,这就是说发射100发火箭只能有3次出现问题。同时,火箭的安全性指标达到0。997,意味着1000次故障所采取的救助措施只有3次是不成功的。
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