Artificial Intelligence Based Control Power Optimization on Tailless Aircraft

Traditional methods of control allocation optimization have shown difficulties in exploiting the full potential of controlling large arrays of control devices on innovative air vehicles. Artificial neutral networks are inspired by biological nervous systems and neurocomputing has successfully been applied to a variety of complex optimization problems. This project investigates the potential of applying neurocomputing to the control allocation optimization problem of Hybrid Wing Body (HWB) aircraft concepts to minimize control power, hinge moments, and actuator forces, while keeping system weights within acceptable limits. The main objective of this project is to develop a proof-of-concept process suitable to demonstrate the potential of using neurocomputing for optimizing actuation power for aircraft featuring multiple independently actuated control surfaces. A Nastran aeroservoelastic finite element model is used to generate a learning database of hinge moment and actuation power characteristics for an array of flight conditions and control surface deflections. An artificial neural network incorporating a genetic algorithm then uses this training data to perform control allocation optimization for the investigated aircraft configuration. The phase I project showed that optimization results for the sum of required hinge moments are improved by more than 12% over the best Nastran solution by using the neural network optimization process

Toward a theory of restraint

Consumption largely remains a black box in the population, environment, and global change debates. The dominant perspective takes insatiability as axiomatic and assumes that reduced consumption will only happen through scarcity or the impositions of external authority. Yet humans often exhibit resource limiting behavior that is not the result of external controls nor is it altruistic or aberrant. This article develops the concept of restraint as an evolutionarily and culturally significant behavior, yet one that in modern times has been relegated to a regressive, if not trivial, status. The article defines restraint, hypothesizes its historical and evolutionary roots, lays out the conditions under which it can occur, and develops a theoretical parallel to cooperation in international relations theory.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43491/1/11111_2005_Article_BF02208422.pd

A Qualitative Piloted Evaluation of the Tupolev Tu-144 Supersonic Transport

Two U.S. research pilots evaluated the Tupolev Tu-144 supersonic transport aircraft on three dedicated flights: one subsonic and two supersonic profiles. The flight profiles and maneuvers were developed jointly by Tupolev and U.S. engineers. The vehicle was found to have unique operational and flight characteristics that serve as lessons for designers of future supersonic transport aircraft. Vehicle subsystems and observed characteristics are described as are flight test planning and ground monitoring facilities. Maneuver descriptions and extended pilot narratives for each flight are included as appendices