A critical challenge faced by sustainability science is to develop strategies cope with highly uncertain social and ecological dynamics. This article explores the use of robust control framework toward this end. After briefly outlining framework, we apply it traditional Gordon–Schaefer fishery model explore fundamental performance–robustness robustness–vulnerability trade-offs in natural resource management. We find that classic optimal policy can be very sensitive parametric uncertainty. By...

*Morphing research projects will revolutionize the costs of building and operating aircraft. These technologies enable aircraft to be more effi cient operate under a wide range varying flight conditions. Morphing used improve performance, expand its envelope, replace conventional control surfaces, reduce drag vibration/flu tter. There might never single solution for morphing The suitability type technology that is integrated into an dependent on size, performance envelope. largest economical...

In this paper, we provide an overview of scramjet-powered hypersonic vehicle modeling and control challenges. Such vehicles are characterized by unstable non-minimum phase dynamics with significant coupling low thrust or FER (normalized fuel equivalency ratio) margins. Recent trends in research is summarized. To illustrate system design issues tradeoffs, a generic nonlinear 3DOF longitudinal model capturing aero-elastic-propulsive interactions for wedge-shaped used. The analyzed over broad...

Cifdaloz, O., A. Regmi, J. M. Anderies and Rodriguez. 2010. Robustness, vulnerability, adaptive capacity in small-scale social-ecological systems: the Pumpa Irrigation system Nepal. Ecology Society 15(3): 39. https://doi.org/10.5751/ES-03462-150339

This paper makes use of the direct heuristic dynamic programming design in a nonlinear tracking control setting with filtered error. A Lyapunov stability approach is used for analysis system. It shown that closed-loop error and approximating neural network weight estimates retain property uniformly ultimate boundedness under presence approximation bounded unknown disturbances certain conditions.

This study explored patient and clinician perspectives on a new fixed-dose combination of macitentan tadalafil (M/T FDC) in once-daily single tablet for treatment pulmonary arterial hypertension (PAH). Qualitative semi-structured interviews were conducted during the open-label period global, phase 3 A DUE clinical trial that evaluated M/T FDC. subset enrolled patients (N = 26) site investigators 18 clinicians) interviewed. Patients received four tablets double-blind could be one three arms...

This paper addresses hierarchical modeling and control issues within a modern semiconductor fabrication facility. It is well known that fabs are appropriately modeled via discrete event systems. Such models, however, difficult to analyze even more use for design purposes. In this new method the fab presented. The leads models which approximate over small time scales. These provide synchronous discrete-time approximations may be useful analysis design. They also natural tool systematically...

This paper describes the development and analysis of gain-scheduled, multi-variable H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">infin</sub> control law for conversion a linear parameter varying (LPV) model high-speed autonomous rotorcraft vehicle (HARVee), an experimental tilt-wing aircraft. Tilt-wing aircraft combine cruise capabilities conventional airplane with vertical takeoff station keeping abilities helicopter by rotating their...

Research in robots that emulate insect flight or micro aerial vehicles (MAV) has gained significant momentum the past decade owing to vast number of fields they could be employed in. In this paper, key modeling and control aspects a flapping wing MAV hover have been discussed. Models varying complexity developed by previous researchers. Here, we examine validity assumptions involved some these models closed-loop setting. Every model limitations with proper design feedback can overcome up...

This paper presents guidelines for developing a multivariable centralized automatic flight control system (AFCS) twin lift helicopter (TLHS). Singular value ideas are used to formulate performarce and stability robustness specifications. A Linear-Quadratic-Gaussian with Loop Transfer Recovery (LQG/LTR) design is obtained evaluated.

This paper describes an Interactive Modeling, Simulation, Animation, and Real-Time Control (MoSART) Environment that is useful for controls education research. The described MoSART environment shown to be analyzing, designing, visualizing, evaluating control systems a class of "cart-pendulum" electromechanical systems. environment-referred as Cart-Pendulum Control3D-Lab-is based on Microsoft Windows, Visual C++, Direct-3D, MATLAB/Simulink. can used stand-alone application or together with...

Within this paper, control-relevant vehicle design concepts are examined using a widely used 3 DOF (plus flexibility) nonlinear model for the longitudinal dynamics of generic carrot-shaped scramjet powered hypersonic vehicle. Trade studies associated with vehicle/engine parameters examined. The impact on static properties (e.g. level-flight trimmable region, trim controls, AOA, thrust margin) and dynamic instability right half plane zero flight path angle) Specific considered include: inlet...

In this paper, an overview is provided of control efforts implemented using the scramjetpowered hypersonic vehicle model developed by Bolender, Doman, et.al. (2005-2009). The nonlinear characterized unstable non-minimum phase dynamics with aeroelastic-propulsion coupling and propulsion constraints. viability simple inner-outer loop single-input single-output (SISO) structures examined quantified. Reference command amplitude bandwidth tradeoffs are addressed. A (non-scheduled ) law shown to...

A new control algorithm with improved regulation is presented for a switching dc buck converter. The controller realized hardware description language (HDL) and can be implemented in any process. uses four decision levels, combines pulse frequency modulation (PFM), width (PWM), dithering regulation. prototyped on field programmable gate array (FPGA) experimental results show good performance over input load disturbances. Importantly, the does not require high resolution analog-to-digital...

In this paper, a method is presented for enhancing the performance of stable EMRAAT bank-to-turn (BTT) missile in presence multiple saturating actuators. The involves design saturation detection system, called an error governor which maintains, to extent possible, multivariable properties original autopilot design. system prevents saturation, ensures finite-gain L/sup /spl infin// stability, and directionality autopilot.

In cases where social animals must be temporarily housed alone, environmental enrichment is particularly important. Providing with manipulable objects (“toys”) a common form of enrichment, but its effectiveness can limited by animal disinterest or habituation. The current study examined whether caregiver interaction could increase the object-based for quarantined bottlenose dolphin (Tursiops truncatus). Behavioral observations were conducted after training session, trainer toy play and...

Current methodologies for designing control systems usually ignore the effects of saturations. For vehicle platooning, this can be especially disastrous since performance a platoon nonidentical vehicles is, in general, severely limited by saturating signals. This paper presents systematic design procedure adapting nominal controller, designed without regard to saturation, higher nonlinear controller that explicitly accounts nonlinearities while preserving stability. In particular, error...

In this paper, we examine the control of a scramjet-powered hypersonic vehicle with significant aero-elastic-propulsion interactions. Such vehicles are characterized by open loop unstable non-minimum phase dynamics, low frequency aero-elastic modes, coupling, and hard constraints (e.g. surface deflection limits, thrust margin). Within attention is placed on maintaining acceptable closed performance (i.e. tracking speed flight path angle commands) while satisfying as well stoichiometrically...

Abstract Leveraging S-STEM Scholarship Programs AbstractWith increasing tuition fees, more and students are finding themselves unable to meet thefinancial needs of college. Engineering computer science difficult majors studentsmajoring in these fields find that if they have work while going school, the task is evenmore difficult. It often takes five years for graduate many itdifficult continue take loans order stay school. not uncommon 80%of at a large university need financial help. The...

In this paper, three methods are presented to enhance the performance of an unstable missile system in presence multiple saturating actuators. Each method involves design a saturation detection system, which modifies nominal autopilot via online optimization and maintains, extent possible, multivariable properties design. To prevent due exogenous signals, disturbances noises, particular, error governor is proposed. This processes signals within feedback loop state compensator, so that...

In this paper we consider the design and control of an airbreathing hypersonic vehicle. Such vehicles are characterized by non-minimum phase characteristics, instability, actuator saturation constraints, lightly damped flexible modes.While traditional vehicle has followed iterative sequential procedure (with controller following aero-centric phase), integrated vehicle-control process (based on bilinear matrix inequalities) is considered in paper. We several example problems to illustrate...