We consider a shape optimization problem in rotordynamics where the mass of a rotor is minimized subject to constraints on the natural frequencies. Our analyis is based on a class of rotors described by a Rayleigh beam model including effects of rotary inertia and gyroscopic moments. The solution of the equation of motion leads to a generalized eigenvalue problem. The governing operators are no...

The wind turbine blade is an important component for harnessing energy. It plays a vital role in operation. In this work, study was conducted to investigate the dynamic behavior of optimal rotary with bond graph approach simulated MATLAB/Simulink. model considered as twisted Rayleigh beam which made several sections type SG6043 airfoil. This airfoil suitable low conditions, and each section sub...

Title of Document: INTENSE LASER ACCELERATION OF QUASI-MONOENERGETIC PROTONS Tung-Chang Liu, Doctor of Philosophy, 2013 Directed By: Professor Chuan S Liu, Physics By irradiating an ultra-thin overdense foil with an intense circularly polarized laser beam, the laser radiation pressure can push the foil forward. This scheme, laser radiation pressure acceleration, is one of the most actively stud...

Appendix A. Calibration of the sensitivity of the ICCD camera Two independent techniques were used for the sensitivity calibration: Rayleigh scattering from air and Mie scattering from standard spherical polystyrene latex particles. The laser beam was focused by a spherical lens (focal length 200 mm at 248 nm), so that the focal point was in the field of view of the optical system composed of t...

in this study, the free vibration of partially fluid-filled laminated composite circular cylindrical shell with arbitrary boundary conditions has been investigated by using rayleigh-ritz method. the analysis has been carried out with strain-displacement relations based on love’s thin shell theory and the contained fluid is assumed irrotational, incompressible and inviscid. after determining the...

Elastic wave velocity in a soft fiber that varies depending on material constitution and axial stress level is an essential measure of mechanical signals many technical applications. In this work, based the small-on-large theory, we establish model linear elastic propagation finitely pre-stretched fiber. The formulas longitudinal (L-) transverse (T-) velocities are provided validated by numeric...

The queuing performance of a finite-user slotted-Aloha type random access protocol with multipacket reception capability at the base station is considered. The system evolution under this protocol can be described by a finite dimensional Markov chain, which is not amenable to analysis due to complex interactions between user queues. A “user-centric” analysis approach is proposed, which focuses ...

Optical extinction by a dilute dispersion of metal nanoclusters in GaAs is calculated using the optical theorem and Maxwell-Garnet theory with complex dielectric functions for Cr, Fe, Ni, Cu, Ag, Au, Er, and As. The large dielectric function of the semiconductor host-shifts the surface plasmon resonance frequencies from the ultraviolet to the near infrared. The noble metals have well-defined re...

Various numerical boundary condition methods have been proposed to simulate various aspects of the no-slip wall condition using the Lattice Boltzmann Method. In this paper, a new boundary condition scheme is developed to model the no-slip wall condition in the presence of the body force term near the wall which is based on the Bennett extension. The error related to the new model is smaller tha...

In this study, the free vibration of partially fluid-filled laminated composite circular cylindrical shell with arbitrary boundary conditions has been investigated by using Rayleigh-Ritz method. The analysis has been carried out with strain-displacement relations based on Love’s thin shell theory and the contained fluid is assumed irrotational, incompressible and inviscid. After determining the...