Response of Aeroengine with Fusing Design Suffering FBO

Abstract

The loss of fan blades in an aeroengine, or fan-blade out (FBO), is a type of accident that causes a sudden imbalance and large impact load, which leads to complex vibration of a system. To conduct a dynamic analysis of an aeroengine rotor system is an important requirement for relevant departments. The purpose of this paper is to study the dynamic response of a complex dual-rotor system suffering FBO events and the protective effect of the fusing structure on the system. The dynamic model of an aeroengine dual-rotor system is established, and the response of the rotor system is obtained by calculation and analysis. The rear support bearing of the fan has a high reaction force, which may lead to bearing failure. The mechanism of a fusing structure is analyzed, and the results show that the sudden imbalance will produce impact loads on the rotor, resulting in a sharp increase in the vibration amplitude and reaction force, and then, attenuation to steady state. The fusing structure can reduce the amplitude of steady-state rotor vibration and reaction force on the support bearings. However, the transient response of the rotor will increase because of the sudden change in support stiffness.

Effect of Microstructural Evolution on Mechanical Properties of Secondary Hardening Low‐Carbon High‐Alloy Bearing Steel

“…Bearings are extensively utilized in various industries such as aerospace, high‐speed rail transportation, machinery manufacturing, and intelligent manufacturing, being commonly referred to as “the heart of industry.” As the aviation industry continues to advance, the comprehensive performance of aviation‐bearing materials is confronted with increasingly rigorous demands. [ 1,2 ] The practical utilization of bearings frequently exposes them to challenging service environments characterized by high speeds, extreme stress, and elevated temperatures, necessitating bearing materials with exceptional strength and superior toughness. [ 3–5 ] Researchers have shown significant interest in secondary hardening bearing steel, particularly CSS‐42L, due to its remarkable strength–toughness compatibility, exceptional corrosion resistance, high‐temperature hardness, and prolonged operational lifespan.…”