The goal of the present study is to develop a decentralized coordinated attitude control algorithm for satellite formation flying. To handle the nonlinearity of the dynamic system, the problems of absolute and relative attitude dynamics are formulated for the State-Dependent Riccati Equation (SDRE) technique. The SDRE technique is for the first time utilized as a nonlinear controller of the rel...

Since the 1990s, state-dependent Riccati equation (SDRE) strategies have emerged as general design methods that provide a systematic and effectivemeans of designing nonlinear controllers, observers and filters. These methods overcome many of the difficulties and shortcomings of existing methodologies, and deliver computationally simple algorithms that have been highly effective in a variety of ...

COMPENSATION FOR A SMALL UNMANNED HELICOPTER Alexander Bogdanov , Eric Wan OGI School of Science and Engineering, OHSU 20000 NW Walker Rd, Beaverton, Oregon 97006 In this paper we report on the state-dependent Riccati equation (SDRE) control of a small unmanned helicopter for autonomous agile maneuvering. SDRE control requires reformulation of the vehicle dynamics into a pseudo-linear form. For...

In this paper, a detailed study on the Model Reference Adaptive Controller is presented for online estimation of Rotor Time constant and speed for indirect field oriented control Induction Motor Drive with MRAC. This MRAC consists of two models. The first is Reference Model and other one is Adjustable Model. One model is independent of slip speed and other one is dependent on slip speed. The MR...

Modern flight control systems are expected to perform beyond their conventional flight envelopes and exhibit robustness and adaptability to uncertain environments and failures. Adaptive control has been shown to improve the performance of a flight control system in the presence of uncertainties and failures. Recently, a new adaptive design named DF-MRAC has been developed which offers the possi...

The aim of this paper is to design a Fuzzy Logic Controller-based Model Reference Adaptive Controller. It consists of Fuzzy Logic Controller (FLC) along with a conventional Model Reference Adaptive Control (MRAC) scheme. The idea is to control the plant by conventional MRAC with a suitable single reference model, and at the same time control the plant by FLC. In the conventional MRAC scheme, th...

Abstract— Improving the transient performance of the MRAC has been a point of research for a long time. The main objective of the paper is to design an MRAC with improved transient and steady state performance. This paper proposes a Fuzzy modified MRAC (FMRAC) to control a coupled tank level process. The FMRAC uses a proportional control based Mamdani-type Fuzzy inference system (MFIS) to impro...

The state dependent Riccati equation (SDRE) technique is a recently developed methodology for designing control laws and estimation algorithms for missile flight control. Although its potential is well recognized by control theory experts, the industry acceptance of the technique has been slow. The main reasons for this are: a) unlike linear control technology, the SDRE approach requires advanc...

Translational and Molecular Imaging Institute, Icahn School of Medicine at Mount Sinai, NY, NY, USA Current MR/PET systems employ segmentation of MR images and subsequent assignment of empirical attenuation map values for quantitative PET reconstruction. In this current study we examine the quantitative differences between our carotid artery imaging protocol on both a PET/CT and an MR/PET scann...

Staphylococcus aureus is an opportunistic pathogen, commensal of the human skin and nares, but also responsible for invasive nosocomial as well as community acquired infections. Staphylococcus aureus adheres to the host tissues by means of surface adhesins, such as SdrC, SdrD, and SdrE proteins. The Sdr family of proteins together with a functional A domain, contain respectively two, three or f...