In the January 20, 2009, the inauguration of President Barack Obama on a robot astronaut “guide,” with a lunar rover leisurely walk, attracting people's attention. Lunar rover is here, and not accidental. That are everywhere but a distant world, 40 years ago, the United States realized the first manned lunar landing, and now once again become the focus of international competition, but will allow astronauts to the moon light work vehicles, represented by the scientific and technological strength. And other technologies, like lunar rover is continually evolving in the … …
1, convertible car glory days
“Flying into the universe, the vast boundless!” This is the Disneyland of the hero “Buzz Light year” mantra, the invincible hero does not know to conquer space, the number of young people and even adults, ignite their space dreams. However, “Buzz Light year” prototype - “Apollo 11″ Lunar Module pilot Buzz Aldrin 40 years ago, and the commander of the moon with Neil Armstrong, it can not be so scenery . Due to the lack of means of transport, the two “Earth Visitors” can only be wearing 84 kilograms of bulky spacesuits on the surface in the staggered walk, although the moon's surface gravity is only one-sixth of the earth, but this by the 21-layer fabric consisting of a bloated clothes, or walking to their great inconvenience, but carried life-support system can support up to 4 hours. So there will be a historical film, we see the Apollo program astronauts on the moon walk funny ways: either moving cautiously, or “leap” forward. Bulky spacesuit equipment, coupled with scientific investigation and collection of lunar soil and rock samples, these “heavy burden” to the first few groups of the astronauts on board the moon's surface caused by a lot of difficult and dangerous.
See here, smart readers will think, why not take astronauts to the moon cars do. The U.S. space program's “chief designer” and later served as director of Marshall Space Flight Center, von Braun also thought of this as early as the 1950s von Braun, and Hewlett-Packard Erdeng pioneer in the space age, “Crean Weekly “(Collier's Weekly) published a series of” science fiction “article,” Fantasy “from the future on the moon, Mars exploration needed in all kinds of technology (in this series of articles to become Disney's first film is based on space exploration script), including the lunar rover (Lunar Rovering Vehicle).
“Apollo program” using the “Lunar Rover” is a four wheel, self-development and production started in May 1969 by Boeing's contract (a unit of General Motors Delco companies as sub-contractors involved in the development), cost of 3800 million, were created by four. The car length 3 meters wide and 2 meters high 1 meter, size, and today's Volkswagen Beetle car almost. Empty weight of 209 kilograms, plus two astronauts and equipment weighs about 700 kilograms. . Vehicle communication system includes a high-gain antenna used to transmit pictures and data, as well as a low-gain antenna for the transmission of sound and television signals. To the lunar rover to provide electricity to two 36-volt batteries. In the driving seat in the middle have a handle, in theory, said that two astronauts could drive the car, but customarily carried out by a long driving instruction.
Lunar Rover has a separate quarter for each wheel horsepower (200 watt) electric motor and brakes, traveling at the speed of the moon's surface 10 to 12 kilometers per hour. Independent motors drive the wheels to ensure a real-time failure of lunar vehicles will still be able to turn. Redundancy design is NASA's first principle, this design will also reduce the lunar rover to the U-turn radius of 3 meters. The lunar rover can climb 25 degree slopes, as far as 67 km can be opened up, but for security reasons, the scope of activities of astronauts no more than 10 kilometers, so the ball Wan Yiyue car broke down, and they can in life-support system expired walked back to the Lunar Module. The first use of lunar rover is in “Apollo 15″ mission.
Apollo 15 was the original plan and the previous period of the moon the same task, but in September 2, 1970 NASA suddenly announced the cancellation of the Apollo 18 lunar landing program and beyond will be Apollo 15, No. 16-17 from the H type of task (ie in the vicinity of landing sites for limited activities) to J type of task (in the moon's surface to stay longer, and use the lunar rover and other updated equipment to carry out more scientific investigation). The use of lunar rover greatly expanded the scope of activities of astronauts, and thus better scientific results.
July 31, 1971, that is, Apollo 15 landed on the moon the day after the first use of a manned lunar rover. Commander David Scott (David Scott) driving lunar rover and the Lunar Module Pilot James Irwin (James Irwin) went to the Elbow crater 3 km outside the study and collecting samples, and then to another location Hadley Hill visits, and then drove back to the lunar module. The second inspection tour to Hadley Hill, Irwin found the famous “Genesis of the Stone” (Genesis Rock, or called the origin of stone), this piece of anorthosite another piece of stone in the head was found, but then The analysis confirmed that it should be generated early in the solar system formed, and the age at least 40 billion years. Before leaving the moon, Scott has done a free fall time on the surface will be a feather and geological hammer at the same time opening up, because on the surface there is no air resistance, both at the same floor, which is four hundred years ago Galileo has moved from theory to prove. Unexpectedly, bending over to pick up in the Scott plans of the feathers on this time, Irwin stepped on one foot, so that the root “of significance” would permanently stay in the feather on the moon.
Scott and Irwin to stay three days in the lunar surface, extravehicular activity 18 hours 37 minutes to drive the road 27 kilometers and collected about 77 kilograms of lunar rocks. With the lunar rover, the astronauts were so much easier, and Scott even said: “I really want to sit down and play for a while stone, these shiny little stones really are extremely cute.” Apollo No. 15,16,17 scientific investigation completed tasks, including the number of collected lunar rocks, are far more than the previous. All three lunar rover on the moon to stay forever and become the “Moon Museum” part of it. More recently, India's “Chandrayaan-I” satellite and the United States, LCROSS satellites are found in Apollo
Plan to stay in lunar rover activity remains, but also to so-called “moon hoax” rumors have been dashed.
In the last century, the US-Soviet space hegemony in the Soviet Union did not show weakness, and the successful lunar rover in time for the United States prior to the success of two unmanned lunar rover to the Moon, respectively, known as the “lunar rover 1, 2, “(Lunokhod 1,2).
Lunar Rover-1 rides on the “Moon 17″ on at the November 17, 1970 in the rain on the sea surface landing area, this is the first time on Earth to another world of robot remote control. The Zheliang lunar rover like a cylinder shape, a protruding above the lid, car Here are eight wheels, each wheel are also independently controlled. The vehicle equipment includes a cone-shaped antenna, a high-precision directional helical antenna, four television cameras, as well as some used to measure the density of lunar soil and the physical and chemical characteristics of the device. The following is the convex cover solar cells. On the surface of the antenna is responsible for the situation to send to Moscow a five-member team, and they are remote controlled lunar rover next move.
This station lunar rover 2.2 meters long, 1.6 meters wide and weighs 756 kilograms. A total lunar rover on the 1st run 10 for one month (only work on the Moon during the day), until October 4, 1978 it was terminated, the day the Soviet Union launched Sputnik days. It is moving a total of 10 kilometers, returning 20000 pieces of television pictures and more than 200 panoramic pictures. Car load of solar X-ray telescope X-ray band, while the laser is used for the determination of the Earth's distance test.
January 15, 1973, lunar rover 2, from “Moon 21″ carrying landed in Chenghai district. This sets lunar rover slightly heavier than that on the 1st to reach 840 kilograms, length 1.7 meters wide and 1.6 meters high 1.35 meters. It has two-speed mode, 1 km or 2 km per hour. In order to prevent the lunar rover on the moon a long night of super-low temperatures have been nipped, the car carrying the isotope heat source, using the element polonium-breaking decay provide energy to maintain the warmth of lunar rover. However, in June 4 that year came to an end this mission, the Soviets did not disclose the reasons is generally believed that may be due to 5,6 on the moon between the long cold night, leading to failure of lunar rover.
Second, return to the moon era of competition in the luxury car
US-Soviet space hegemony era astronauts on the moon between the two countries place more importance on the political significance of the moon's surface sampling can be achieved has been sufficient. But today the situation has been very different, the moon, the rich fusion of raw materials into the goal pursued by all countries, so “the moon club” re-emergence of all the major countries have joined the ranks of the moon, the United States is more ambitious made not only to the year 2020 “return to the moon,” and to establish a lunar base to achieve a permanent presence on the moon and the moon as a springboard for more to explore the depths of the universe, such as to go to send astronauts to explore Mars.
In the lunar surface is not an easy thing to drive, even if the Apollo program in a few hours of short trips, also need to astronauts in the desert terrain in the simulation of contact a few months to come through a “road test” because the moon's surface the situation is too special. The lunar surface gravity is only one-sixth of the earth, and covered with a layer of soft soil, which hampered the effectiveness of the vehicles of the road. On the rugged surface of the vehicle wheels, the chassis design of the formation of numerous obstacles, cornering, climbing is an unusual thing, the moon above, safety first. One day the moon is equal to one month on the earth, temperature changes of up to 300 degrees, “day” sunshine baked the night cold stones can be damaged by frost, which made the vehicle difficult material requirements. Apollo lunar rovers used in the piano line is to maintain the elasticity of the mesh-type tires.
Lunar base means that more heavy labor, for which NASA specifically designed a “lunar truck” (lunar truck). This vehicle and the Apollo program in the Rover, just as convertible car, the astronauts need to wear spacesuits in order to drive. Truck bluntly, that is used to transport bulk goods, in order to meet the demands of building a lunar base, NASA also plans to add other devices in the vehicle, such as forklifts or cranes. Trucks will have six wheels, each wheel has two tires. This breakthrough in the traditional “six-wheel design” has been running in the Mars Rover has been tested, even if one wheel fails, another five wheels still have superior ability to act. The wheel itself can achieve 360-degree independent rotation, this design gives an unprecedented mobile performance, heavy-duty trucks can be made to any one direction. In order to adapt to different terrain, heavy-duty truck chassis can be reduced or increased, the design of the lifting force up to 2 tons of cargo is not the speed can reach 25 km / hr.
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Lunar truck has been located in Houston's Johnson Space Center to design a prototype, and tested on a simulated lunar sites.
NASA also a new product, aimed at the presence of the moon astronaut extravehicular activities, namely, “a small pressurized rover” (Small Pressurized Rover), due to no longer be convertible, a closed compartment make astronauts while driving Such vehicles do not need to wear spacesuits. This roaming vehicles are more than 4 meters length width and weight up to 4 tons, load quite up to take four astronauts in the case of guaranteed 3 days of continuous activity. This means that a pressurized rover is actually a small workstations, the scope of its activities up to 240 km, is not worse than the heavy-duty trucks.
Roaming the car has a small bathroom, equipped with spray nozzles can be sponge brush. Each crew has its own private space, separated by a curtain. However, the only food was dried noodles and other convenience foods, because the car is not the kitchen. In the Arizona desert in the simulated tests, astronaut Gerhard even think that Rover as comfortable as the space shuttle. As the human interface settings, the astronauts could be without decompression or compression device directly into a lunar base or enter the spacesuits that will definitely give the Apollo program astronauts envy.
In addition to the manned lunar rover, NASA is also developing an unmanned moon vehicle, that is able to automatically work in the moon's surface robots, such as ATHLETE. This is also a six-wheel robot, the first-generation prototype is greater than 4 meters in diameter, designers hope that it can be quite extensive areas of fast-rolling, or walking, the ultimate goal is to design a system which could combine with other specialized equipment or load multi-objective system. ATHLETE of the load capacity of about 450 kg, a number of robots that match the results can have a greater transport capacity.
Indian Space Research Organization also issued a remote control unmanned lunar rovers planned for 2013 by the “Chandrayaan-II” carried on the moon's surface landing. The rovers used a Russian design, weight 58 kg, six-wheel-drive, will be the moon's surface near the polar scientific expedition for about a year, its exercise of the speed of 570 kilometers per hour, range of activities up to radius of 150 km.
In fact, not only the United States, Russia, the European Union, Japan, India and other countries put forward their own model of lunar rover, and even many private institutions to get in, such as Google Inc. came up with 20 million U.S. dollars to set up a “Google Lunar X Contest” to encourage non-governmental organizations or companies design their own lunar vehicles, be able to photograph the moon's surface after landing and also the road 500 meters, they get awards. So far have been about 20 participating teams, a variety of imaginative design concepts and models.
4, the future lunar rover
As human return to the moon and begin to build a permanent base, the moon began to immigration, a new generation of lunar vehicles will be available. As the moon without air ordinary vehicles can not be used on the moon, only to the main electric car, or use tools such as rockets. With the construction of a lunar base, “Moon society” grow, will produce a variety of specialized uses lunar rover, and means of transport, compared to today, imagine the future of transportation looks like the moon.
The most lightweight lunar rover should be “the moon motorcycle,” only one person ride. In order to drive safely on the surface, it should have three wheels, as it is exposed to type, the driver must be wearing a spacesuit. This is mainly used for light vehicles at close range and from the moon's surface, or solar power station maintenance purposes.
On the moon rocket single-car, no tires, by the rocket jet, the surface of the month for leap-frogging. As the moon's surface gravity is very small, single-seat vehicle for fast-moving between the two places, or to and from the Moon and the Earth between the orbital space station.
High-performance two-seater multi-purpose small-scale lunar rover that can travel hundreds of kilometers a row, suitable for short-distance travel, there are four mesh-type tires, to fuel cells as power source, replace the cylinder with a way to supplement the fuel.
COMBI lunar rover could take six people, and load 500 kilograms, can travel 180 km a row, it also uses sealed, there are two tracks. In addition it is used to detect, but also can be transported between the various facilities in the universe who do not wear uniforms and small animals.
Moon Trailer trucks and tractor units from the container two parts for the transport of supplies. It is powered by solar cells, fuel cells can also be used simultaneously, so that night will be able to work at double speed in the moon's surface.
Lunar orbit bus also known as “wheel landing capsule” once it left the lunar orbit on a low angle into the moon's surface, in the length of 100 km on the runway at a speed of 500 kilometers, as the same sled glide landing, about 2 minutes after that they can stop a.
Lunar orbit bus, due to a rock hard surface may not be suitable for construction of the subway, then the construction of sturdy materials, the safety of the ground rail transportation will become the main form of mass travel. Lunar orbit the bus is more convenient than the subway quickly, but because to guarantee the safety and cost will be very high.
There is also a medium-sized lunar exploration vehicle equipped with the spotlight of high-performance, high sensitivity digital communications antenna measurements, surveillance cameras and radars, the moon may also be driving a dark night. Such cars tire type, but also as a temporary stop to the use of the moon.Video Converter for Mac
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Above the moon vehicles, which are still developed. However, when humans set foot on the moon, establish a base in the above, exploitation of resources on the moon as well as the tourism industry, the building of the moon city, the future of lunar vehicles will appear in front of the people, but also may be updated Yingqi Te car appeared. By that time, humans take on the lunar rover to realize the ideal of roaming the moon.
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