Helicopter Aeroelastic Analysis With Tandem Rotor Blades Implication On Safety And Operation Us Air Force Jet

Unlike aerofoil-shaped aircraft such as fighter jet or aircraft with aerofoil parts such as wings that use aerofoil lift force for flight and most importantly; have a lot of research material about their aeroelastic behavior easily accessible in the public domain, the tandem rotor helicopter uniquely relies entirely on its rotor blades for lift force during flight and most importantly; has got hardly any trace of research material about its aeroelastic behaviour in the public domain. Aeroelastic disturbances that are associated with more sophisticated heavy-duty Army aircraft such as the tandem rotor helicopter are capable of generating disturbances that are sufficiently violent to cause the almost instantaneous failure of the structure of the helicopter. This studythus aims to analytically model and establish a relation between the nature and variation of the external aerodynamic environment of a helicopter with tandem rotor blades and its internal structural dynamics characteristics, which would be modeled as a series of masses connectedby springs and dampers. This will, in turn, enable the prediction and thus anticipation, through analytic modelling and estimation of acting loads and changes of stiffness and deformation of the sections in and across the helicopter; of aerodynamic safety and failure criteria such as thepitching velocity margin, rolling velocity margin and the margin of the safe payload eccentricity in the fuselage and also enable suggest possible test fixes during the modeling and analysis of the aeroelasticity of the helicopter. The study also aims to analyze the effect of the variation ofthe structural flexibility of the segments of the tandem rotor helicopter and the distribution of loads in the body structure of the helicopter. The necessity to produce better tandem rotor helicopters that have low structural vibration levels, low noise, and enhanced performance willcontinue to motivate researchers all around the world and aeromechanics to develop innovative approaches for the solution of these aeroelasticity challenges. This study will thus contribute to the rare research material about the aeroelastic behavior of tandem rotor helicopters accessibleto the public domain.