There are about two hours left. Shenzhou 15 will take astronauts Fei Junlong , Deng Qingming , Zhang Lu , and head to my country's space station to carry out a six-month space mission. Early tomorrow morning, you can see the scene of 6 astronauts in my country in orbit at the same time. At present, three batches of astronauts have been transferred to my country's space station. Shenzhou 15 is the fourth batch, among which Shenzhou 14 is the busiest crew. During their orbit, they have successively connected the two experimental cabins of "Wentian" and "Dreamtian" and three spacecrafts, "Tianzhou" 5, Shenzhou 14 and "15".
ship arrow combination is ready to go. The temperature in Jiuquan tonight is very low
However, in terms of the most out-of-cabin crew, the Shenzhou 15, which is about to set off, will carry out 3 to 4 out-of-cabin activities during their orbit. At least one out-of-cabin time will be close to 8 hours, challenging the physiological limits of astronauts and the maximum support ability of the "Flying" out-of-cabin space service . This is really "a veteran is taking action, one is two." Don't worry, you can drink water in the space suit outside the "Fei Tian" cabin and have "diapers".
is ready to set off
. Internationally, 8 hours is also the limit of extra-cabin activities. Among the current 255 outgoing activities of the International Space Station, most of them are 6 to 7 hours, and only 12 outgoing activities of about 8 hours. The longest record for a single outgoing cabin was created in March, November 2011 by American astronauts James Voss and Susan Helms . At that time, they were out of the cabin for 8 hours and 56 minutes to prepare the interface for the International Space Station. Generally speaking, 8-hour cabins are all about doing big work, so what big work should our Shenzhou No. 15 crew this time do in the nearly 8-hour cabin?
What big work is the Shenzhou No. 15 crew going to do?
Look at my country's space station. At present, the three cabins are in place and the two wings have been deployed. However, the "Tianhe" core cabin's sun wing is in its current position. On the one hand, it will be blocked by the cabin body, and the sun-affected area will be reduced, so it will not be able to generate power at full power. On the other hand, since it is arranged parallel to the two experimental compartments and is very close to it, it somewhat hinders the movement of the space robotic arms, so at the beginning of the design, we were ready to move them to the ends of the two experimental compartments when the first phase of the space station project was almost completed, and arranged in a T-shaped shape with the large sun wings in a quadrant, which is perfect.
core compartment solar wings are currently parallel to the experimental compartment
robotic arm is very close to
to move the sun wings, but a big job is to first fold it up, and then the astronauts are responsible for removing them from the core compartment. In this process, pyrotechnic , which is a controllable small explosion. Then the robotic arms transfer them to the end of the experimental cabin, and another astronaut installed and unfolded it there, and finally re-arranged and connected the entire power supply system. In order to complete the work, the astronaut even had to climb three cabins at a time.
Now the core compartment sun wings are like this. In the red circle,
Shenzhou 15 crew members need to move them to the end of the experimental compartment
During the construction of the International Space Station, there was a similar shift work, which is the P6 truss and the sun wings it carries. The P6 truss was brought to the International Space Station by the Endeavor space shuttle in December 2000. It was first installed above the Z1 truss and serves as the main source of electricity for the space station. When the space station was almost built, from October to November 2007, the STS-120 mission crew performed four outgoings before permanently replacing it at the front end of the comprehensive truss structure .
The initial solar wing arrangement of the International Space Station
The construction process of the International Space Station
The specific process is as follows: On October 26, 2007, two American astronauts first recovered the S band antenna assembly on the Z1 truss, then disconnected the fluid pipeline between the P6 truss and the Z1 truss, and installed the radiator shield at the tail of the P6 truss, which took 6 hours and 14 minutes. And two days later, on October 28, they separated the P6 truss from the Z1 truss, and combined with some other work, it took a total of 6 hours and 33 minutes.On October 30, they installed the P6 trusses onto the P5 truss, connected the P5 and P6 truss pipelines, and reconfigured the S1 trusses to check the "Sun Alpha" rotary joint , which took a total of 7 hours and 8 minutes.
The last time was November 3. The work was to inspect and repair the solar panel of the P6 truss, which took 7 hours and 19 minutes. In other words, the P6 truss and the sun wings it carries were shifted, and a total of 3 astronauts took four out-of-cabin walks, which took 27 hours and 14 minutes before finally getting it done. And a few years ago, the two sun wings of the P6 truss fool had been closed separately in two times, and this time was not counted.
It is worth mentioning that the displacement of the solar wings of the International Space Station this time is also assisted by the space robotic arm, and it is integrated with the P6 truss. Our core cabin sun wings are divided into two, but there are no bulky trusses. It is not known how many times the Shenzhou 15 crew members need to be divided into before they can be transferred to the ends of the two experimental cabins. Do you think it can be done in one go?
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