Behind ski jumping, black technology!

2022-06-05 0 By

The Beijing Winter Olympic Games officially opened on February 4. Among the wonderful winter Sports, ski jumping is an extreme sport that integrates speed, power and courage. It is popular among snow and ice lovers around the world for its long jump distance and graceful movements.The wind in nature is the ski jumper’s closest “partner” in training and competition.”Different environmental wind, different speed, different body weight, different flight posture, will produce the corresponding air change law, which is technically called ‘aerodynamic characteristics’.””Yuan Li, president of the Aviation Industry Corporation of China aerodynamics Research Institute (AVIC) and China’s ice and snow science consultant, told Science and Technology Daily.According to Yuan li, after more than a year of wind tunnel assisted training and computational fluid dynamics research, the Aviation Industry Pneumatic Institute made use of aviation wind tunnel technology to make a historic breakthrough in the performance of Chinese ski jumers — men jumped over 140 meters for the first time, women won the first place in the international points competition for the first time.Finally, the Chinese ski jumping team got three “tickets” for the Beijing Winter Olympics.Sports Aerodynamics wind tunnel research wind tunnel is an artificial way to generate and control airflow, used to simulate the flow of air around aircraft or entities, is the most commonly used and effective tool for aerodynamic experiments, known as the “pioneer” of aerodynamic technology development.The basic principle can be understood as “objects move, air does not move” in the real movement process, and “air moves, objects do not move” in the wind tunnel, so as to simulate the aerodynamic characteristics generated by the mutual movement between air and objects.”With the wind tunnel, you can get the force, speed, Angle and rotation speed parameters during the movement, and then you can analyze and determine the best position of equipment control and body;The flow display technology visualizes the flow characteristics around the test object, making analysis and interpretation more intuitive and convenient.”Aviation industry pneumatic institute technical expert, China ice and snow scientist Wang Chongli said.Comprehensive sports wind tunnel laboratory in 2019, knowing that the platform of athletes in our country have made a special trip to wind tunnel training abroad every year, time cost and the economic cost is extremely high, pneumatic courtyard active joint state general administration of sports, aviation industry using the aircraft aerodynamic principle, cross-border ski jumping project in China, to make the two classes, a total of three sports special wind tunnel, including,The comprehensive sports wind tunnel built in Laiyuan is the largest and most comprehensive sports aerodynamic test facility in the world.Ski jumping and wind tunnel technology collide with each other.During the wind tunnel training of the national ice and snow Team for more than one year, the scientific and technical personnel of the Institute of Aeronautics and Astronautics always accompanied the ice and snow athletes and fully communicated with the national ski jumping team, forming a systematic scientific training program from skiing assistance, takeoff to flight.”In the process of ski jumping and taking off, the skis of the athletes are in the fixed U-shaped piste at high speed, and the foot force state is different, will lead to the skis will inevitably scratch both sides of the piste, and lead to the loss of sliding speed.”Wang Chongli said, through the wind tunnel training, can be in simulation, the relative wind speed through the load platform of the athlete’s feet with precision instrument and different gestures by frictional resistance, to comprehensive evaluation steps of power athletes, jump right Angle, thereby improving slip and jump posture, speed increase.”Lift fly” is an important training in ski jumping.When the wind speed is given in the wind tunnel, the large “fan” starts to operate, and the athletes take off under the traction of the safety rope. The relative airflow in the wind tunnel gradually gives the athletes aerodynamic lift.”The athletes are in a state of the aerodynamic force balance and body gravity, the athletes can make a ski jumping air flight posture, and can be ‘trust’ in the wind tunnel to try to adjust the body posture, to realize the effect on the body balance, enhance athletes to maintain the best attitude to harness the skis flying in the air.”Wang chongli said.Ski jumping international wind tunnel flight training in China, according to Yuan Li besides wind tunnel support scientific research training, aviation industry pneumatic court another core technology, computational fluid dynamics (CFD), also for ski jumping research provides a more effective means of power, through the body posture 3 d scanning technology to ski jumping team conducted a slip and flight attitude of 3 d modeling,Because of the use of computer simulation means, so can get the athletes around the flow and the air pressure of each part of the body information, through the analysis of the flow around the human body under different poses and the lifting resistance, can identify the main factors affecting sports performance, for the national team to optimize the technical movements to provide a quantitative reference.(Credit: Science and Technology Daily)