Gas suspension technology helps "get" aviation bearing "black technology" in China


Science and Technology Daily Changsha April 23 The importance of bearing technology for aerospace equipment is equivalent to the importance of "chip" to electronic equipment. On the 23rd, Changsha, 2019 "China Aerospace Day" news media entered the Hunan University centralized interview activities, the reporter was informed that the school's high-end intelligent equipment key components research center, focusing on "high-end gas suspension technology" for many years, focus on forming autonomous The key core component technology of the control is to break the foreign monopoly. At present, new progress has been made in ultra-high-speed, ultra-high temperature dynamic pressure air bearing technology and ultra-precision heavy-duty static pressure air bearing technology.

Feng Kai, a professor at the School of Mechanical and Vehicle Engineering of Hunan University, introduced the basic principle of dynamic pressure air bearing technology, similar to "aircraft takeoff." After the aircraft reaches a certain speed to the ground, it can "hang" in the air. After the rotating shaft of the rotating equipment reaches a certain speed, it can be "suspended" in the air without external auxiliary equipment. Therefore, the dynamic pressure air bearing technology can achieve the speed that cannot be reached by conventional bearing technology. At the same time, due to the use of gas as a suspension medium, it is not sensitive to temperature. The gas dynamic pressure bearing technology can adapt to a wide temperature range, which is very suitable for the requirements of power equipment, power density, speed, life and temperature. Up to now, the air suspension high-speed gyroscope developed by the team and aerospace related institutes has a rotational speed of 40,000 rpm, and a gas-suspended high-speed turbine generator with a design speed of 100,000 rpm.

Feng Kai also introduced "Gas Static Bearing Technology". The basic working principle of this technology is to introduce a gas into a relatively moving two objects by externally connecting a high-pressure gas, and to separate the objects to achieve non-contact suspension. The team and the aerospace institute used static pressure gas suspension technology to simulate the small gravity and frictionless working environment of space, providing ground simulation conditions for spacecraft. A number of multi-degree-of-freedom attitude simulation platforms have been designed and implemented. "In the future, the spacecraft will become heavier and heavier, and the fidelity of the simulated space environment will be higher and higher. The bearing capacity and accuracy of the air-floating technology are put forward higher. We will also be in the lubrication mechanism, bearing materials, More systematic and detailed work on structural design and system integration."