问题详情

Applications outside the Earth s atmosphere are clearly a good fit for robots. It is dangerous for humans to get to space, to be in space and to return from space. Keeping robots operating reliably in space presents some unique challenges to engineers. The ultra-high vacuum in space【M1】______ prevents the use from most types of lubricants. The【M2】______ temperatures can swing wildly depending on whether the robot is in the sun light or shade. But, of course, there is【M3】______ almost no gravity. This is actually more of an opportunity than a challenge and leads to the possibility of some unique designs. The conceptual robot has 21 independent joints. On earth it would be possible for this robot to support its own【M4】______ weight, but in space, the design presents some unique capabilities. The robot can reach around obstacles and through out port holes. The robot also possesses a huge【M5】______ degree of fault tolerance. It can continue to operate with excellent dexterity even after several joints fail. NASA decided to develop a $288-million Flight Telerobotics Servicer(FTS)in 1987 to help astronauts assemble the Space Station, which was growing bigger and complex with each redesign. Shown here is the winning【M6】______ robot design by Martin Marietta, who received a $297-million contract in May 1989 to develop a vehicle by 1993. About the best thing which can be said for the FTS【M7】______ project was that it generated a lot of lessons learned. The robot never flew and never will because it was never【M8】______ completed. This project demonstrated that fault tolerance gone wildly will doom a robot. The robot had so many【M9】______ redundant systems that there was just so much to go wrong.【M10】______

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