C919's Aerospace Style Device | Aircraft | C919

Recently, the second C919 aircraft arrived at Taizhou International Airport in Yangzhou, Jiangsu.

Yuxing Photography

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 international airworthiness standards, with a focus on meeting the needs of large and medium capacity markets both domestically and internationally.

As a large aircraft, the C919 received assistance from China Aerospace Science and Technology Corporation during its development process, thus adding a touch of "aerospace style".

Simulation Technology of Airframe Flight Force Status

The aircraft damage tolerance test is one of the most complex and challenging tests in the aircraft testing system. In 2020, the Static Research Laboratory of the Beijing Institute of Strength and Environment at the First Academy of Aerospace Science and Technology Group developed the "Airframe Flight Force Simulation Technology" for the C919, which can detect various forces on more than 30 parts of the fuselage at the same time, without leaving any dead corners. This is the most accurate damage tolerance test technology in China at that time, with a reading accuracy of 0.005 millimeters.

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 Co., Ltd., the Beijing Institute of Aerospace Metrology and Testing Technology of the First Academy of Aerospace Science and Technology Group jointly conducted application research on wing shape distortion, large wall panel profile, and flexible assembly positioning measurement of cabin segments. By applying the frequency modulation LiDAR scanning measurement technology developed by the Beijing Institute of Aerospace Metrology and Testing Technology, the three-dimensional point cloud data of the cabin profile 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 Metrology and Testing Technology, a research institute of the First Academy of Aeronautics and Astronautics, 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 benches, and assisted relevant parties in establishing and monitoring supplier quality systems. It also carried out metrology and calibration work 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 provided by Beijing Oriental Institute of Metrology and Testing, Fifth Academy of Aerospace Science and Technology Group, provides strong support for the calibration of key components of C919, titanium alloy materials, and vacuum heat treatment devices for aircraft engine blades, as well as the calibration of temperature data acquisition devices for large aircraft.

Full 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 meets the requirements in the final configuration state. This test is undertaken by the Shanghai Radio Equipment Research Institute of the Eighth Academy of Aerospace Science and Technology Group.

As the only unit in China with full aircraft high-intensity radiation field testing capabilities, 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 maiden flight to certification, filling the gap in the field of HIRF airworthiness compliance testing for Chinese aircraft and providing assurance for the successful maiden flight of C919.

Combined attitude measurement unit

The C919 combined attitude measurement unit is managed by the Laser Navigation Company of the Beijing Aerospace Control Instrument Research Institute of the Ninth Academy 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 type laser and the most advanced combination navigation algorithm at that time, making the C919 combination attitude not only have extremely high navigation accuracy, but also have multiple functions and extremely high stability, even surpassing customer expectations in some performance functions.

Cargo door actuation system

The cargo door actuation system of C919 is developed by the Beijing Institute of Precision Mechanical and Electrical Control Equipment of the First Academy of Aerospace Science and Technology Group. The system mainly provides power support for the opening and closing of cargo doors and other actions of C919. It has the characteristics of high safety, long service life, high control accuracy, and has passed the reliability design of the entire life cycle, which can follow the aircraft for 30 years.

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