This paper presents a new mathematical model for a model-scale helicopter. Working from first principles and basic aerodynamics, the equations of motion for full six degree-of-freedom motion are derived. The control inputs considered are the four pilot commands from the radio transmitter: roll, pitch, yaw, and thrust. The model helicopter has a fast time-domain response due to its small size, a...

OBJECTIVE To determine whether increasing distance between helicopter ambulance airbase and either home residence or referring facility is associated with an increased risk of injury-related mortality. BACKGROUND A dramatic increase in the absolute number and utilization of Helicopter Emergency Medical Services transports has occurred in the management of the critically injured patients. HEMS...

A two-layer robust control scheme is proposed to get a better response ability for emergency maneuvers of helicopter. Note that the power used in ascending flight is the main coupling between helicopter and its turboshaft engines; therefore vertical flight control is separated from conventional helicopter control loops and combined with fuel flow and turbine bleeding to new control loops denote...

The main performance characteristics of a helicopter is its fuel consumption. This paper reports the current state in an ongoing project seeking a fast and approximative implementation of mathematical models for helicopter performance predictions, primarily in terms of fuel consumption. The model is limited to a subset of the normal operation modes, only including hover, climb and forward. Also...

The use of Artificial Intelligence (AI) agents to represent helicopter pilots inside closed-loop simulations has been a significant focus of collaborative research activities between DSTO’s Air Operations Division (AOD) and the University of South Australia. CHOPPA (Combined Helicopter OPerations and Performance Analysis) is a MATLAB/Simulink based simulation framework developed by AOD which su...

INTRODUCTION Over-inflation of endotracheal tube (ETT) cuffs has the potential to lead to scarring and stenosis of the trachea.1, 2,3, 4 The air inside an ETT cuff is subject to expansion as atmospheric pressure decreases, as happens with an increase in altitude. Emergency medical services helicopters are not pressurized, thereby providing a good environment for studying the effects of altitude...

In this study, we design an autonomous navigation, guidance and control system for a small electric helicopter. Only small, light‐weight, and inaccurate sensors can be used for the control of small helicopters because of the payload limitation. To overcome the problem of inaccurate sensors, a composite navigation system is designed. The designed navigation sys...

This paper presents a technique to accurately estimate the state of a robot helicopter using a combination of gyroscopes, accelerometers, inclinometers and GPS. Simulation results of state estimation of the helicopter are presented using Kalman ltering based on sensor modeling. The number of estimated states of helicopter is nine : three attitudes( ; ; ) from the gyroscopes, three accelerations...

A model-free "teaching by showing" methodology is developed to train a fuzzy-neural controller for an autonomous robot helicopter. The controller is generated and tuned using training data gathered while a teacher operates the helicopter. A hierarchical behavior-based control architecture is used, with each behavior implemented as a hybrid fuzzy logic controller (FLC) and general regression neu...

BACKGROUND Despite many studies addressing potential impact of helicopter transport on trauma mortality, debate as to the efficacy of air transport continues. METHODS This retrospective study combined trauma registry data from five urban Level I adult and pediatric centers. Logistic regression assessed effect of helicopter transport on mortality while adjusting for age, sex, transport year, r...