Over the last 5 years, a number of ultrasonic approaches to residual and applied stress measurements using emats have been reported. none of these has been evaluated on steel but there are no fundamental reasons why most cannot be applied to steel. when the measurement constraints imposed by making… More

It is clear from recent published articles that the generation of surface waves must be considered when interpreting measurments made using a wide-angle, focused-beam, reflection-mode acoustic microscope. there exists much new and useful information in these surface waves and understanding them in a… More

Calculations and measurements are presented to demonstrate that leaky, closed-end resonators and partially closed, open-end resonators can be used to measure the proximity of the resonators to a surface. conversely, for a fixed sensorresonator position, the resonator characteristics can be used to… More

Quite recently, it has been shown that the impact-echo (ie) method can yield a great deal of information about the internal structure of concrete, including the presence of cracking and disbonded reinforcing material. careful examination of the ie method, however, shows that under many circumstances… More

This proposal outlines several possible approaches to the development of electrical power supplies that derive their primary energy from storage mechanical energy. in general, it is envisioned that these mechanical energy storage systems (springs and gas reservoirs) will be charged using either… More

A recently developed nonlinear controller(developed by the PI and the project consultant) called the theta-D method is the centerpiece around which an Integrated Guidance and Control scheme and a nonlinear filter technique are built to enhance the lethality of kinetic kill interceptors and offer… More

This proposal deals with new techniques for the guidance and control of Boost Phase of the missile defense. A new concept integrating the synergy between guidnace and coontrol is offered as an Integrated Guidance and Control approach; furthermore, a new nonlinear controller-filter called the theta-D… More