c(2x2) Interface Alloys in Co/Cu Multilayers - Influence on Interlayer Exchange Coupling and GMR

The influence of a c(2x2) ordered interface alloy of 3d transition metals at the ferromagnet/nonmagnet interface on interlayer exchange coupling (IXC), the formation of quantum well states (QWS) and the phenomenon of Giant MagnetoResistance is investigated. We obtained a strong dependence of IXC on interface alloy formation. The GMR ratio is also strongly influenced. We found that Fe, Ni and Cu alloys at the interface enhance the GMR ratio for in-plane geometry by nearly a factor of 2.Comment: 14 pages, 5 figures, 1 table, subm. to PR

A Multidisciplinary Design Environment for Composite Rotor Blades

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/97071/1/AIAA2012-1842.pd

Guided-wave signal processing using chirplet matching pursuits and mode correlation for structural health monitoring

Signal processing algorithms for guided wave pulse echo-based structural health monitoring (SHM) must be capable of isolating individual reflections from defects in the structure, if any, which could be overlapping and multimodal. In addition, they should be able to estimate the time–frequency centers, the modes and individual energies of the reflections, which would be used to locate and characterize defects. Finally, they should be computationally efficient and amenable to automated processing. This work addresses these issues with a new algorithm employing chirplet matching pursuits followed by a mode correlation check for single point sensors. Its theoretical advantages over conventional time–frequency representations for SHM are elaborated. Results from numerical simulations and experiments in isotropic plate structures are presented, which show the capability of the proposed algorithm. Finally, the issue of in-plane triangulation is discussed and experimental work done to explore this issue is presented.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/58147/2/sms7_2_014.pd

Aeroelastic Stability of High-Speed Cylindrical Vehicles

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/143048/1/6.2017-0406.pd

Rapid Simulation of a Hypersonic Vehicle Through Singular Value Decomposition

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/143044/1/6.2017-0178.pd

Aerothermoelastic Simulation of Air-Breathing Hypersonic Vehicles

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140706/1/6.2014-0149.pd

High Speed Vehicle Fluid-Structure-Jet Interaction Analysis and Modeling

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/143047/1/6.2017-0405.pd

Stretched exponential relaxation in the mode-coupling theory for the Kardar-Parisi-Zhang equation

We study the mode-coupling theory for the Kardar-Parisi-Zhang equation in the strong-coupling regime, focusing on the long time properties. By a saddle point analysis of the mode-coupling equations, we derive exact results for the correlation function in the long time limit - a limit which is hard to study using simulations. The correlation function at wavevector k in dimension d is found to behave asymptotically at time t as C(k,t)\simeq 1/k^{d+4-2z} (Btk^z)^{\gamma/z} e^{-(Btk^z)^{1/z}}, with \gamma=(d-1)/2, A a determined constant and B a scale factor.Comment: RevTex, 4 pages, 1 figur

Unsteady Fluid-Structure-Jet Interactions of Agile High-Speed Vehicles

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/143059/1/6.2017-3549.pd

Flight Dynamic Stability of a Flapping Wing Micro Air Vehicle in Hover

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90667/1/AIAA-2011-2009-272.pd