In this paper ,the general solution of steady-state one dimensional asymmetric thermal stresses and electrical and mechanical displacements of a hollow cylinder made of functionally graded material and piezoelectric layers is developed .The material properties ,except the Poisson's ration, are assumed to depend on the variable radius and they are expressed as power functions of radius. The temp...

In this project a new integrated multi level AC-DC converter is proposed. The proposed converter has two independent controllers. First controller is used to control the input side and the second for the output side. The input controller prevents DC bus voltage from becoming excessive and performs power factor correction and regulates DC bus voltage. The output controller regulates output volta...

My research focuses primarily on optimal control of systems in domains with contacts, equipped with variable impedance actuators. The control of such robots is non-trivial due to the the discontinuity in the dynamics which is introduced by mechanical contact with the environment. The traditional optimal control approach is designed to handle smooth continuous system dynamics for tasks over a pr...

Abstract: This paper presents a nonlinear H∞ control law for underactuated mechanical systems with input coupling. Apart from the controlled degrees of freedom (DOF), the proposed controller considers the dynamics of the remaining DOF in the cost variable, which allows to stabilize them. The underactuated mechanical system is normalized to obtain a diagonal inertia matrix allowing to weigh with...

Radiotherapy for malignancies in the head and neck can cause common complications that can result in tooth damage that are also known as radiation caries. The aim of this study was to examine damage to the surface topography and calculate changes in friction behavior and the nano-mechanical properties (elastic modulus, nanohardness and friction coefficient) of enamel and dentine from extracted ...

We present a new type of feedback linearization that is tailored for mechanical control systems. call it linearization. Its basic feature the preservation structure system. For systems with scalar control, we formulate necessary and sufficient conditions are verifiable using differentiations algebraic operations only. illustrate our results several examples.

abstract- a real-time, site-specific, machine-vision based, inter-row patch herbicide application system was developed and evaluated. the image resolution was 640 × 480 pixels covering a total area of 350 mm x 240 mm of a field composed of four quadrants of 350 mm x 60 mm each. the image frames were processed by labview® and matlab®. the developed algorithm, based on weed coverage ratio and seg...