The paper deals with the innovative concept of "variable voltage" bus concept for future more-electric aircraft platforms. Using new functionalities and opportunities offered by innovative sources actively controlled by power electronics, there is an opportunity for significant increase of their output power (within powertrain capabilities, machine thermal limits and power converter maximum current) to supply increased load demands under certain conditions. The paper investigates application of this concept to satisfy power demands for wing ice-protection system for business-jet. The study includes detailed study into the control challenges of the proposed approach and suggests corresponding theoretical solutions. Furthermore, the controller design aspects are explored with considerations to achieve stable operation. The concept is tested in simulation environment and validated through experimental studies. This paper might be of interest for the researchers and engineers focused on innovative solutions for future aircraft platforms.
Index Terms-control design, icing protection system, more electric aircraft, variable voltage control, voltage wildSeang Shen Yeoh received his MSc degree in power electronics (Distinction) and Ph.D degree in electrical engineering from the University of Nottingham, United Kingdom, in 2011 and 2016 respectively. Since then, he has been a research fellow in the same university under the Power Electronics, Machines, and Controls Research Group. His current research interests are in the area of aircraft application, namely modelling and stability studies of complex power systems, and new control strategies for high speed drive systems.
THE AIM OF THIS ARTICLE IS TO DESCRIBE A NOVEL MILITARY UNIQUE OPERATOR READINESS ASSESSMENT (ORA). THE ORA WAS DESIGNED BY TACTICAL HUMAN OPTIMIZATION, RAPID REHABILITATION, AND RECONDITIONING PROFESSIONALS AS PART OF A RETURN-TO-DUTY PROTOCOL TO SPECIFICALLY EVALUATE THE MUSCULOSKELETAL READINESS AND PHYSIOLOGICAL PREPAREDNESS OF PREVIOUSLY INJURED OPERATORS. THE ORA COMPRISES 11 TACTICALLY RELEVANT AND PHYSICALLY TAXING EVENTS COMPLETED IN ORDER WITH A 2-MINUTE REST BETWEEN EVENTS. DEVELOPMENT OF A COMPREHENSIVE RETURN-TO-DUTY PROTOCOL OF THIS NATURE IS A NECESSARY FIRST STEP FOR TACTICAL STRENGTH COACHES TO REDUCE RISK OF REINJURY TO PREVIOUSLY INJURED PERSONNEL.
The Dallas Area Rapid Transit (DART) Light Rail System (LRT) is unique among all other Light Rail Transit Systems in North America because it employs a real time, Energy Management Demand Metering System (EMS) to monitor and control traction power load.This system has been provided to reduce the cost impacts of demand billing imposed by the local electric utility. The fundamental requirement of the EMS is to predict the occurrence and timing of maximum peak loads and remotely control the power contributions from traction power substations to optimize the overall demand balance of each utility metering point. Figure 1 shows the EMS display for the south end of the DART LRT system. 0-7803-55334/99/$10.00 8 1999 IEEE
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