The "Aerospace Style" of C919

Tech 2023-07-24 08:41:52 Source: Network

Recently, China Eastern Airlines officially received the second domestically produced C919 large passenger aircraft in Shanghai, indicating that the commercial operation of the C919 large passenger aircraft is accelerating.The C919 large passenger aircraft is China's first self-developed jet mainline passenger aircraft with independent intellectual property rights in accordance with internationally accepted airworthiness standards, with a focus on meeting the needs of both domestic and foreign high-volume and medium volume markets

Recently, China Eastern Airlines officially received the second domestically produced C919 large passenger aircraft in Shanghai, indicating that the commercial operation of the C919 large passenger aircraft is accelerating.

The C919 large passenger aircraft is China's first self-developed jet mainline passenger aircraft with independent intellectual property rights in accordance with internationally accepted airworthiness standards, with a focus on meeting the needs of both domestic and foreign high-volume and medium volume markets.

As a large aircraft, the C919 was assisted by China Aerospace Science and Technology Corporation ("Aerospace Science and Technology Group" for short) in the development process, so it added a bit of "aerospace style".

Simulation Technology of Airframe Flight Stress State

Airframe Damage tolerance test is one of the most complicated and difficult tests in the aircraft test system. In 2020, the Static Research Office of Beijing Strength Environmental Research Institute of the First Academy of Aerospace Science and Technology Group developed a "simulation technology of fuselage flight stress state" for C919, which can detect various forces on more than 30 places of the fuselage at the same time without leaving dead angles. This is the Damage tolerance test technology with the highest accuracy in China at that time, and the interpretation accuracy has reached 0.005mm.

Intelligent measurement technology

Metrological testing is an extremely important part of the C919 development process, and in this regard, the research team of Aerospace Science and Technology Group has made due contributions.

In 2017, at the invitation of COMAC Shanghai Aircraft Manufacturing Company Co., Ltd., Beijing Aerospace Measurement and Testing Technology Research Institute of the First Academy of Aerospace Science and Technology Group jointly carried out applied research work such as wing profile distortion, large panel profile and segment flexible assembly positioning measurement. By applying the FM LiDAR scanning measurement technology developed by the Beijing Institute of Aerospace Measurement and Testing Technology of the First Academy, the three-dimensional point cloud data of the cabin contour was effectively measured, solving the problems of deformation and directional positioning of large aircraft structures such as C919.

In 2019, the Beijing Institute of Aerospace Measurement and Testing Technology, a research institute, was designated as a designated metrology institution by China Aerospace Development Corporation. It provided debugging and calibration services for its core equipment non-standard engine test bench, and assisted relevant parties in establishing and monitoring supplier quality systems. Measurement and calibration work was carried out for the relevant specialized equipment pre delivered by its instrument suppliers, helping domestic large aircraft to be installed in China's "heart".

Measurement and calibration of key components

As a large passenger aircraft, the C919 is greatly affected by environmental conditions such as climate, machinery, and radiation, ensuring product reliability is closely related to metrological testing.

The high-precision calibration technology for aerospace provided by Beijing Oriental Measurement and Testing Institute, the Fifth Academy of Aerospace Science and Technology Group, has provided a powerful guarantee for the calibration of titanium alloy materials and vacuum heat treatment devices for C919 key parts and aircraft engine blades, and the calibration of large aircraft temperature data acquisition devices.

Whole aircraft high intensity radiation field test

For aircraft in flight, the electromagnetic radiation generated by radar, radio, television stations, etc. is a "hidden killer". The high-intensity radiation field airworthiness certification test of the entire aircraft is used to test whether the electromagnetic protection ability of the entire machine in the final configuration state meets the indicator requirements. This test is undertaken by the Shanghai Radio Equipment Research Institute of the Eighth Institute of Aerospace Science and Technology Group.

As the only unit in China with the ability to conduct full aircraft high intensity radiation field (HIRF) testing, the Shanghai Institute of Radio Equipment of the Eighth Academy has broken through foreign technical barriers and participated in the entire process of C919 aircraft from first flight to certification, filling the gap in the field of China's aircraft level HIRF airworthiness compliance testing and providing guarantee for the successful first flight of C919.

Combined heading and attitude measurement unit

The C919 combined attitude measurement unit is the responsibility of the Laser Navigation Company of the Beijing Aerospace Control Instrument Research Institute of the 9th Institute of Aerospace Science and Technology Group. The company's research and development team, with deep experience in model development, chose its independently produced high-precision 90 laser and the most advanced integrated navigation algorithm at that time, which not only provided the C919 integrated attitude with extremely high navigation accuracy, but also had multiple functions and extremely high stability, even surpassing customers' expectations in some performance functions.

Cargo door actuation system

The cargo door actuation system of C919 is developed by the Beijing Precision Electromechanical Control Equipment Research Institute of Aerospace Science and Technology Group. The system mainly provides power support for the opening and closing of the cargo door of C919, and has the characteristics of high safety, long service life, high control accuracy, and has passed the reliability design of the entire service life. It can work with the aircraft for 30 years.

The system adopts an electric and mechanical heterogeneous redundancy design, and in the event of any single point failure of the aircraft cargo door, it will not affect the normal operation of the entire system. During the entire stroke of opening and closing the door, the accuracy can reach 0.1 millimeters, ensuring the stability of the cargo door opening and support.

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