ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effects of slung load on heavy lift helicopter air resonance stability
Received date: 2022-09-08
Revised date: 2022-09-21
Accepted date: 2022-11-14
Online published: 2022-11-29
Supported by
National Natural Science Foundation of China(11672128);Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
Piloted heavy lift helicopters are faced with air resonance problems related to fuselage elasticity， which deteriorate when carrying a slung load. This paper points out three coupled modes that may lead to air resonance through heavy lift helicopters with slung load through rigid-elastic coupled modeling and analysis. The first is rotor progressive lag and fuselage vertical bending coupled mode， the second rotor-body-sling coupled mode， and the third regressive lag and fuselage rolling coupled air resonance. Their mechanisms and effects of slung load on air resonance stability were investigated. The results show that the first coupled mode is most likely to cause air resonance while hovering with heavy slung load， and that the second coupled mode has the largest impact on the air resonance stability when flying with light slung load. They are both related to rotor lagging motion and fuselage vertical bending， but the second involves significant sling extending-retracting. The third coupled mode causes an 18% reduction in air resonance stability margin when carrying a heavy slung load.
Luofeng WANG , Renliang CHEN . Effects of slung load on heavy lift helicopter air resonance stability[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(16) : 227983 -227983 . DOI: 10.7527/S1000-6893.2022.27983
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