Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： This paper studies the forward flight dynamic model of tilt rotor unbalanced load proposed byJohnson , and applies its blade analysis method to the modal analysis of helicopter rotor system.Under theassumption of rigidity , the flapping and shimmy motion equations of helicopter rotor blade under the com-bined action of elastic damping and inertial force are derived , and the corresponding motion equations infixed and rotating coordinate systems are given.By introducing the assumption of uniform inflow and lineartorsion , the theoretical analytical solution of the equation of motion is obtained.Then , using the superposi-tion principle , the axial motion equation of the hub is obtained; Newmark method is used to solve the vibration differential equation , and finally the axis motion trajectory of helicopter rotor is obtained.Taking a hel-icopter rotor system as an example , the accuracy of the rotor blade modal analysis method proposed in thispaper is verified , and the optimal solution step selection method considering both calculation accuracy andefficiency is given. 'The hub axis trajectory under typical flight state is predicted , which provides a basicmethod and technical reference for the design of helicopter rotor system.
Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： In the process of aircraft service , it will experience complex dynamic processes such as groundtaxiing and maneuver etc.'The aireraft structure and airborne equipment will bear the individual or jointeffect of various dynamic loads during these processes. The induced structural dynamic problems are di-rectly related to the aircraft service safety and passengers’ride comfort. This paper sorts out the require-ments of structural dynamics in the military airplane structural integrity program and strength specification,as well as the airworthiness regulation of civil aircraft. The relationship between the structural dynamicsand R&D of aviation equipment is presented.'The main issues of aircraft structural dynamics are classifiedfrom the aspects of loads , structure , response and control.At last , the prospect of aircraft structural dynam-ics is briefly concluded considering the needs in aircraft equipment research and the newly developed vi-bration techniques.
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