Curiosity s size makes getting it safely onto the Martian surface tricky. Previous rovers havedeployed parachutes to slow their descents, and have then crashed into the ground usingairbags to cushion their impacts. Curiosity is too massive for that approach to work.Instead, NASA hopes to deposit it on Mars using a contraption it has dubbed a skycrane.
好奇 号体积庞大,这使其安全着陆火星的工作变得十分棘手。之前的漫游车的下落过程采用降落伞减速,并采用气袋来缓冲撞击地面造成的冲击。但这种方法对于体积庞大的 好奇 号却不适用。美国宇航局意图采用一个设计精巧的 空中起重机 使 好奇 号安全着陆火星。
As with the other rovers, Curiosity s mother ship will rely on heat shields and air-resistance,and then on a parachute, to slow its arrival. But at an altitude of 1.6km a specially designeddescent stage bearing the rover will drop away from this vehicle. The descent stage haseight rocket motors on its corners. These will slow its fall to a relatively sedate 0.75 metresa second. When it is about 20 metres above the surface, the rover will be lowered from it onwires and deposited gently onto the Martian landscape. The cables will then be cut withexplosives, the descent stage will fly off and crash land elsewhere, and Curiosity will begin itsmission.
与其它火星漫游车相同, 好奇 号运载船也依靠防热罩,空气阻力及降落伞实现减速到达。但不同的是,在到达距火星地表1600米的高空时,经过特殊设计并承载着漫游车的下降段将会脱离运载船。下降段底部四周装有8个火箭发动机,能使下降速度达到每秒0.75米相对缓慢的速度。在距离地面20米时,下降段用线缆将漫游车向下悬吊直至缓慢放置到火星表面。然后线缆引爆切断连接,下降段飞离漫游车在火星其它地方坠落,接下来 好奇 号就可以开始执行任务了。
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