Elevator

About: Elevator is a research topic. Over the lifetime, 20166 publications have been published within this topic receiving 88178 citations. The topic is also known as: lift.

Improving Elevator Performance Using Reinforcement Learning

Abstract: This paper describes the application of reinforcement learning (RL) to the difficult real world problem of elevator dispatching. The elevator domain poses a combination of challenges not seen in most RL research to date. Elevator systems operate in continuous state spaces and in continuous time as discrete event dynamic systems. Their states are not fully observable and they are nonstationary due to changing passenger arrival rates. In addition, we use a team of RL agents, each of which is responsible for controlling one elevator car. The team receives a global reinforcement signal which appears noisy to each agent due to the effects of the actions of the other agents, the random nature of the arrivals and the incomplete observation of the state. In spite of these complications, we show results that in simulation surpass the best of the heuristic elevator control algorithms of which we are aware. These results demonstrate the power of RL on a very large scale stochastic dynamic optimization problem of practical utility.

Robust nonlinear control of a hypersonic aircraft

Abstract: For the longitudinal motion of a hypersonic aircraft containing twenty-eight inertial and aerodynamic uncertain parameters, robust flight control systems with nonlinear dynamic inversion structure are synthesized. The system robustness is characterized by the probability of instability and probabilities of violations of thirty-eight performance criteria, subjected to the variations of the uncertain system parameters. The design cost function is defined as a weighted quadratic sum of these probabilities. The control system is designed using a genetic algorithm to search a design parameter space of the nonlinear dynamic inversion structure. During the search iteration, Monte Carlo evaluation is used to estimate the system robustness and cost function. This approach explicitly takes into account the design requirements and makes full use of engineering knowledge in the design process to produce practical and efficient control systems. A4 MY, m 4 Nomenclatm-e speed of sound, ftls drag coefficient lift coefficient moment coefficient due to pitch rate moment coefficient due to angle of attack moment coefficient due to elevator deflection thrust coefficient reference length, 80 ft drag, lbf altitude, ft moment of inertia, 7 X lo6 slug-ft2 lift, lbf Mach number pitching moment, lbf-ft mass, 9375 slugs pitch rate, radis radius of the Earth, 20,903,500 ft radial distance from Earth’s center, ft reference area, 3603 ft2 thrust, lbf velocity, ft/S angle of attack, rad throttle setting flight-path angle, rad elevator deflection, rad gravitational constant, 1.39 X 1Or6 ft3/s2~ density of air, slugsIft

“Smart” elevator system and method

Abstract: An information and control system for personnel transport devices. In one embodiment, the information and control system is coupled to the elevator system of a building, and includes a touch panel input device, a flat panel display having a touch sensitive screen, and speech recognition and synthesis systems serving each elevator car. The speech recognition and synthesis systems and input device(s) are operatively coupled to a processor and storage devices having a plurality of different types of data stored thereon. Each elevator car is also a client connected to a LAN, WAN, intranet, or Internet, and capable of exchanging data with and retrieving data therefrom. Functions performed by the information and control system include a voice-actuated building directory, download of selected data to personal electronic devices (PEDs), monitoring of areas adjacent to the elevator car on destination floors, and control of lighting and security monitoring in selectable areas of destination floors. The system is also optionally fitted with an RFID interrogator/reader capable of recognizing RFID tags carried by passengers on the elevator, thereby granting access to various controlled locations automatically after password authentication. The RFID system also allows the authenticated passenger(s) to control utilities such as lighting and HVAC within specific zones on their destination floors. The information and control system is also optionally equipped with an occupancy estimating sub-system which allows elevator cars to bypass calling floors when their capacity is reached or exceeded.

Experiments in Fixed-Wing UAV Perching

Abstract: High-precision maneuvers at high angles-of-attack are not properly addressed by even the most advanced aircraft control systems. Here we present our control design procedure and indoor experimental results with a small fixed-wing autonomous glider which is capable of executing an aggressive high angle-of-attack maneuver in order to land on a perch. We first acquire a surprisingly accurate aircraft model through unsteady flight regimes from real kinematic flight data taken in a motion-capture arena. This model is then used in a numerical nonlinear (approximate) optimal control procedure which designs a feedback control policy for the elevator deflection. Finally, we report our experimental data demonstrating that this simple glider can exploit pressure drag to achieve a high-speed perching maneuver.