Our dean Wang Jiamao team science and technology to help the Chinese track cycling team Tokyo Olympic Games gold

On August 2, Beijing time, in the final of the women's team cycling competition at the Tokyo Olympic Games, the Chinese combination Bao Shanju and Zhong Angel won the 28th gold medal for the Chinese delegation in 31.895 seconds. Zhong Angel and Bao Shanju won the gold medal in the group stage of the women's team competition with a world record 31.804 seconds. The opponent was the German team, which also broke the original world record. The German team scored 31.905 seconds in the group stage. Bell Angel individual also won two consecutive titles. Bicycle is a sport with a long history but high technology content. The optimization of aerodynamics has become a necessary means for athletes from all over the world to improve their performance. The Wang Jiandao team of the State Key Laboratory of Tribology of Tsinghua University was fortunate to participate in the preparation and scientific and technological assistance of the Tokyo Olympic Cycle Cycling Team.

Figure 1 Bao Shanju and Zhong Angel won gold at the Tokyo Olympics (photo source: People's Daily)

After the State Key Laboratory of Tribology of Tsinghua University helped Zhong Angel and Gong Jinjie win the Rio Olympic championship in 2016, in the new cycle, the optimization competition of equipment and equipment in various countries has entered a new height. The British team came up with a maverick new car design, various drag reduction technologies gave the competition suit lower air resistance, and the trend of narrowing the handlebars in order to obtain a lower drag coefficient posed new challenges to the athletes' control ability and posture. The State Key Laboratory of Tribology of Tsinghua University has worked closely with the Chinese National Track Cycling Team to fully respond to the new challenges of bicycle track racing through 3D scanning and printing, aerodynamic simulation, wind tunnel experiments, and the use of drag reduction mechanisms.

Fig. 2 Optimization experiment of bell angel attitude

Figure 3 Bao Shanju attitude optimization experiment

Figure 4 Zhong Angel Equal Ratio Model Clothing Test

In terms of bicycle equipment, aiming at the streamlined design of the car body, the State Key Laboratory of Tribology of Tsinghua University and Shandong Ruibao jointly designed a new field racing car with independent intellectual property rights through simulation and wind tunnel experiments. Its wind resistance level is better than Look R96(2016 Rio Olympic National Team Car). In view of the trend of handlebar narrowing, the principle of aerodynamics is explained, and the scientific basis is provided for the team to choose equipment in combination with biomechanics, and the significant drag reduction effect is obtained under the premise of ensuring the sports efficiency of athletes. In terms of clothing, the State Key Laboratory of Tribology of Tsinghua University, in cooperation with Shanghai Institute of Sports Science and Donghua University, has prepared drag reduction clothing. For the national team's optional clothing library, the State Key Laboratory of Tribology and Tribology has prepared a real-life matching model for athletes in conjunction with intelligent manufacturing enterprises such as Jingwei Prudential and Extraordinary Rhythm. A large number of wind tunnel experiments have been carried out in conjunction with the sports comprehensive wind tunnel team to determine the final selection. In terms of helmets, according to the body shape and project characteristics of different athletes, suggestions for the use of helmets are put forward for each national team member. In the most important aspect of body posture optimization, the State Key Laboratory of Tribology of Tsinghua University has successfully established a mathematical model based on the measured data. According to the combination of each athlete with different handlebars and helmets, the quantitative resistance change trend is given, and the key posture elements and optimal drag reduction posture are determined.

Figure 5 The State Key Laboratory of Tribology of Tsinghua University provides scientific and technological assistance to the national cycling team

With science to guide training, let China's Olympic athletes live up to their youth, clear direction, and strive to be the first; with science and technology to help the Olympic Games, let China's Olympic athletes break the shackles of foreign science and technology blockade, will not lose before the starting line; to solve the application problems with basic science, China's sports science and technology will certainly go to a new level.

Reprint... State Key Laboratory of Tribology, Tsinghua University.