Ultrasonic dynamic measurement technology and progress of aero-engine bolt fastening force

The measurement and control of bolt fastening force is a core technology for maintaining the structural integrity and ensuring the power transmission of hot-end components, such as turbine rotor discs in aero-engines. It plays a vital role in ensuring engine performance and extending service life. To guarantee aircraft environmental adaptability and emergency response capabilities under extreme conditions, as well as to improve rapid maneuverability, it is essential to obtain a "health panorama" of the bolt array tightening force during rapid start-up and variable operating conditions. This provides critical data support for the design values and distribution of bolt array tightening forces. This report introduces the traditional fastening force measurement technologies such as torque wrench, fiber Bragg grating strain method and impedance method, as well as the ultrasonic meas urement methods of fastening force such as intelligent bolt and piezoelectric ultrasonic. The advantages and disadvantages of common bolt fastening force measurement technologies are summarized. The typical feasible methods and key technologies of dynamic measurement of bolt fastening force under high speed, strong vibration and temperature influence conditions are analyzed. The research work of electromagnetic ultrasonic and fiber laser electromagnetic ultrasonic carried out by the recent project team around the high-precision measurement of engine bolt fastening force is introduced. Finally, the development trend and application prospect of dynamic measurement technology for bolt fastening force of aero-engine in the future are analyzed and summarized.

Biography

Professor Lu Chao, PhD of Engineering, is a second-level professor and doctoral supervisor. He currently serves as the president and Deputy Party Secretary of Nanchang Hangkong University. He is also the director of the Intelligent Non-Destructive Testing Innovation Center at Taihang Laboratory. Professor Lu is the leader of the "National Huang Danian-style Teaching Team" in "Intelligent Detection Technology and Instrumentation." He serves as a Chief Scientist for the National Key R&D Program of China, a Discipline Leader for Defense-related Disciplines, and the lead for the "14th Five-Year" First-class Peak Characteristic Discipline of Jiangxi Province. He has been honored as an Outstanding Postgraduate Supervisor of Jiangxi Province and is the First Convener of the Jiangxi Aviation Industry Science and Technology Innovation Consortium.He is currently appointed as the executive director of China Aeronautical Society and the deputy director of Nondestructive Testing Branch of China Mechanical Engineering Society.Professor Lu has spearheaded over 30 high-level research projects, including National Science and Technology Major Projects, National Key R&D Programs, the National Natural Science Foundation of China (NSFC), and National Defense Technological Transformation projects. He has published over 200 academic papers and 2 monographs, developed 6 national standards, and holds 21 authorized invention patents. His work has earned him 4 provincial and ministerial-level First Prizes for Scientific and Technological Achievements.