Just for the rendezvous and docking task of the Wentian experimental module and a two-cabin in-line construction task, we have prepared nearly 4,000 fault mode countermeasures to ensure that we can accurately locate and identify the fault at the first time, and timely dispose of.

　　Zhang Qiao

　　The chief designer of the overall system of the Wentian experimental cabin of the Fifth Research Institute of China Aerospace Science and Technology Group Co., Ltd.

　　Launch, orbit, successful docking, astronauts stationed in Wentian experimental module... At 14:22 on July 24, the Chang-5B rocket carrying China's heaviest spacecraft, Wentian experimental module, was successfully launched, 495 seconds later The rocket successfully entered the intended orbit.

Just as everyone took a group photo to celebrate, one team was still staring nervously at the computer screen, waiting for a very important news.

　　About an hour after the launch, the solar wings of the Wentian experimental module were successfully deployed, and the team members' hearts were finally released.

"The deployment of the solar wings is the most critical event in the early stage of our orbit. Only when it is realized can the aircraft fly smoothly and safely." The Fifth Research Institute of China Aerospace Science and Technology Corporation (hereinafter referred to as the Fifth Academy of Aerospace Engineering) Zhang Qiao, chief designer of the overall system of the Wentian experimental cabin, said.

　　"Children of other people" enter the aerospace field

　　Today, "asking the sky" inquires about the sky, and the Chinese dream of "picking the stars and catching the moon on the nine days" is becoming a reality step by step.

　　"It is only the difficulty that shows courage and perseverance; it is only the hard work that leads to success." Zhang Qiao said this, and he did the same.

　　Zhang Qiao was born in a military family in Guangyuan City, Sichuan Province. Influenced by his family, he dreamed of spaceflight since he was a child.

During his studies, Zhang Qiao achieved outstanding results and was always a "child of other people" all the way.

His excellent grades gave him the opportunity to go abroad for study and exchange. Facing the "olive branch" thrown by foreign institutions, he was unmoved. On the journey of building a Chinese space station and realizing the dream of a powerful country in space.

　　On March 30, 2012, the China Space Station officially shifted from the program demonstration stage to the program design stage. The next day, Zhang Qiao officially joined the space station designer team of the Fifth Academy of Aeronautics and Astronautics.

　　Since then, Zhang Qiao has continued to cultivate in his professional field, consolidating the professional foundation, actively participating in the design of the space station, and quickly achieved some achievements in the field of aerospace propulsion and complex analysis and calculation of large spacecraft.

In response to the engine plume effect, he established a multi-region-multi-group plume model, improved engineering algorithms, and related results were applied to the development of large-scale and complex-configuration space stations.

　　"This is not enough. I know that I need to learn the general knowledge of the space station system in various fields, and constantly expand the knowledge. In addition, I need to have complete system research capabilities." Zhang Qiao said.

　　As long as he is there, the development team is very relieved

　　As the "big housekeeper" of the Wentian experimental cabin, Zhang Qiao is very familiar with the whole cabin technical scheme, key technical indicators, risk control points, and the whole cabin development process.

With the continuous deepening of the research and development work, the overall engineering department has continuously increased the tasks and functions of the Wentian experimental cabin, especially after the cabin design state has been basically finalized, it has proposed "new function divisions", "launch according to 23 tons" and "launch according to 23 tons". All-phase fast rendezvous" and other new requirements.

　　Facing the new task, Zhang Qiao organized a team of designers to quickly identify the scope of influence of the change, sort out the interface indicators between sub-systems and between each system of the project, and worked out a feasible change implementation plan, supplementary test plan and deployed it under strong constraints. risk control measures.

It can be said that on the premise of not affecting the development of the main line, the team completed the comprehensive verification of the functions of the Wentian experimental cabin in a short period of time, and realized the "upgrade" of the Wentian experimental cabin.

　　A colleague of Zhang Qiao recalled: "As long as Zhang Qiao is on site, the entire R&D team is at ease. Under his command, the quality of the execution of various R&D processes is high."

　　The last person to leave the general workshop of the day

　　After completing the preliminary research and development work, the Fifth Academy of Aerospace Engineering established the Wentian Experimental Module Launch Site Test Team (hereinafter referred to as the test team) to complete the follow-up work.

On the wall of the general working room of the test team, the team flag of the "Party Member Vanguard" of the test team is hung.

This is the place where the staff of each sub-system go in and out the most every day, and it is also the last room to turn off the lights every night.

The captain of the "Party Vanguard" was the last person to leave every night, and this person was Zhang Qiao.

　　Since the AIT (General Assembly, Integration, Test) center of the space station is located in Tianjin, Zhang Qiao and his colleagues often need to leave Beijing for work in Tianjin.

At that time, the work schedule was very tight, and overtime on holidays was a habit.

Since Zhang Qiao became the "big housekeeper" of Wentian's experimental cabin in 2017, on the basis of reasonably arranging on-duty personnel, he will take the initiative to rush to Tianjin on duty every holiday, so that other colleagues can reunite with their families as much as possible.

　　In order to ensure that the launch is foolproof, Zhang Qiao and his colleagues conducted a lot of rehearsals and prepared many countermeasures.

"Just for the rendezvous and docking tasks of the Wentian experimental module and a two-cabin in-line construction task, we have prepared nearly 4,000 fault mode countermeasures to ensure that we can accurately locate and identify the fault at the first time. Dispose of it in time." Zhang Qiao recalled.

　　In addition, Zhang Qiao also established a thermal radiation coupling model between the engine and the cabin, which laid a technical foundation for optimizing product status, equipment layout and on-orbit working mode; he led various professional units to complete a fully flexible dynamics-based The joint simulation of mechanical load and control of large-scale extravehicular equipment solves the mechanical problems of key equipment such as large-scale flexible solar wings, large-scale space manipulators, and multi-degree-of-freedom drive mechanisms on the space station under multiple control systems.

　　Excited the night before launch

　　Today, the Wentian experimental module has successfully entered a long-term on-orbit operation state.

But recalling the unforgettable 36 hours before and after the launch, Zhang Qiao still couldn't hide his excitement.

　　"The night before the launch, I tossed and turned and barely slept. Thinking that the 'child' was going to go out and go to the battlefield, I was in a mess." Zhang Qiao recalled.

　　3 hours before launch, the whole cabin is powered on normally, the equipment is in good condition, and everything is ready.

　　"When the countdown to the launch was 5 minutes, I cleared my mind again, leaving only the normal flight procedure and the failure plan for the ascent segment in my mind, quietly waiting for the moment of launch." Zhang Qiao recalled.

　　"About 1 hour after the launch into orbit, the solar wing sail board successfully completed a deployment, and it has a bottom! After another 13 hours, the Wentian experimental module successfully docked with the Tianhe core module and hit the bullseye. Then, I saw the solar wing. The windsurfing board is deployed for the second time, the power supply is normal, and it is done!" Zhang Qiao said that when he saw that moment, he felt that everything he had paid before was worth it.

　　Although he is very busy in the aerospace industry, in his spare time, Zhang Qiao does his best to take on family responsibilities and be a good son, good husband and good father.

No matter how late he gets off work every day, he tries his best to chat with his 6-year-old son, sowing the "seeds" of building a dream spaceflight for him.

　　It is the astronauts like Zhang Qiao who dedicated their youth to Xinghe, and did a good job in their respective positions and held on to them, so that they wrote a magnificent picture of the new era in China's aerospace history.