In this paper, the dynamic balance of a rigid variable speed rotor is tested and analyzed. The vibration acceleration measured by analyzer instrumentations. adjustment parameters counterweight, pitch, trailing-edge flap are considered. amplitude phase 1 Ω analyzed through an all-phase fast Fourier transform. experiments conducted using two rotors with same geometry. accelerations fuselage in x,...

Abstract The slow dynamics of unbalanced rotors with a passive self-balancing system are investigated considering the interaction mechanical limited power engine. equations obtained using averaging technique for partially strongly damped systems. Stationary configurations, different types nonstationary solutions while passing through resonance, and areas stability attraction investigated.

The aerodynamic analysis of wind turbine rotors using preconditioned weighted essentially non-oscillatory scheme to solve the compressible NavierStokes equations in non-inertial coordinate system with Spalart-Allmaras one equation turbulence model is presented. A parallel clustering algorithm based on Message Passing Interface library was implemented. The NREL Phase VI rotor with S809 airfoil w...

A general free wake geometry calculation for wings and rotors is presented. The method, which has been implemented in CAMRAD II, gives good performance and airloads correlation at advance ratios of 0.05 and above, with reasonable computation speed. The wake geometry distortion can be calculated for multiple wings, multiple rotors, and non-identical blades; for all wake structures, including mul...

In this paper, we characterize the rotational dynamics and observe rotor-rotor interactions within a crystalline, three-dimensional array of dipolar molecular rotors. The rotating portion of each rotor molecule consists of a dipolar fluorine-substituted phenyl group. The phenyl rotors are connected by acetylene linkages to bulky triphenyl methyl groups which are held rigid in the crystal lattic...

We develop reduction theory for controlled Lagrangian and controlled Hamiltonian systems with symmetry. Reduction theory for these systems is needed in a variety of examples, such as a spacecraft with rotors, a heavy top with rotors, and underwater vehicle dynamics. One of our main results shows the equivalence of the method of reduced controlled Lagrangian systems and that of reduced controlle...