manned maneuvering unit brief introduction
Manned mobile device is a kind of propulsion device for human walking in space, with high-pressure nitrogen and several nitrogen injection thrusters, which are installed in different positions and directions of the "seat". astronaut The thrusters at different positions are controlled by the consignments, and jet in different directions to produce a reaction attitude. Manned mobile devices can carry a certain amount of high-pressure nitrogen, allowing astronauts to reach a place 100 meters away from the spacecraft. This device is from American Space Shuttle It is a personal equipment that can guarantee the stability and free movement of astronauts in space. The manned mobile device looks like a backpack, which is composed of compressed nitrogen box, gas supply system, jet thruster, electronic control equipment, temperature control device and battery. The manned maneuvering device uses high-pressure nitrogen as the flight power under weightlessness environment. The astronauts control the manual controllers on the left and right robotic arms to control high-pressure nitrogen to eject from the propelling nozzles installed at different parts, so as to change the speed, direction and attitude of flight, achieve up and down, left and right, and forward and backward movement, and achieve the purpose of clockwise or reverse maneuvers. The device also supplies the astronauts with oxygen for breathing, maintains the temperature, humidity and other life support conditions required by the human body, and is equipped with special equipment to keep the astronauts and spacecraft in the same orbit. The motorized device is equipped with two sets of nitrogen tanks and gas supply systems that are backup to each other, so as to prevent failures from endangering the safety of astronauts.
February 7, 1984, United States Space Shuttle Challenger For the first time, B McCandless and R Stewart, astronauts of. The longest distance from the space shuttle is more than 90 meters, making it the first "human earth satellite" in the world space history. 
