Flight dynamics and control

Bramwell, A. R. S.; Done, G.T.S.; Balmford, David

doi:10.1016/b978-075065075-5/50008-7

Cited by 44 publications

(78 citation statements)

References 3 publications

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“…The degrees of freedom for the blades of the main rotor are separated into out-of-plane rotation, in-plane rotation about the vertical axis, and in-plane rotation about the span-wise axis, which are known as flap, lag and feather, respectively. [7] Traditional helicopters use the swash plate mechanism, shown in figure 2.3 to change the feather degree of freedom in a collective or cyclic pattern, this is the main control mechanism for a traditional helicopter [7] A hingeless rotor is typical for most HPH and the degrees of freedom are described the same but for the addition of elasticity in the blade response. Flap is the focus of helicopter dynamics literature( [7], [34]) in preliminary analysis phase.…”

Section: Helicopter Dynamicsmentioning

confidence: 99%

“…The derivation of the differential equations for rigid body rotational motion can be found in [7]. The Euler equations, given off-diagonal terms present in the inertia tensor, are…”

Section: Rigid Body Motionmentioning

confidence: 99%

“…The assumption can be used if the difference is negligible. Bramwell [7] and Padfield [34] are referenced for all the material in this section.…”

Section: Helicopter Dynamicsmentioning

confidence: 99%

“…Totah and Patterson used a five degree of freedom kinematic model to study the affect of control on the Da Vinci II. The dynamic model used equations and assumptions presented by Bramwell [7]. The dynamic model ignored The dynamic response shows that the Da Vinci configuration without a control system is unstable.…”

Section: Previous Workmentioning

confidence: 99%

“…These non-linear equations are linearized for preliminary analysis using several helicopter-specific assumptions( [7,34]). Traditional linear stability theory is used to determine the stability of the linearized equations.…”

Section: Solutionmentioning

confidence: 99%

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Determination of Human Powered Helicopter Stability Characteristics using Multi-Body System Simulation Techniques

Brown¹

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Determination of Human Powered Helicopter Stability characteristics usingMulti-Body System Simulation techniques Sean BrownMulti-Body System Simulation combined with System Identification was developed as a method for determining the stability characteristics of a human powered helicopter(HPH) configurations. HPH stability remains a key component for meeting competition requirements, but has not been properly treated. Traditional helicopter dynamic analysis is not suited to the HPH due to its low rotation speeds and light weight. Multi-Body System Simulation is able to generate dynamic response data for any HPH configuration. System identification and linear stability theory are used to determine the stability characteristics from the dy-

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Section: Helicopter Dynamicsmentioning

confidence: 99%

“…The derivation of the differential equations for rigid body rotational motion can be found in [7]. The Euler equations, given off-diagonal terms present in the inertia tensor, are…”

Section: Rigid Body Motionmentioning

confidence: 99%

“…The assumption can be used if the difference is negligible. Bramwell [7] and Padfield [34] are referenced for all the material in this section.…”

Section: Helicopter Dynamicsmentioning

confidence: 99%

Section: Previous Workmentioning

confidence: 99%

Section: Solutionmentioning

confidence: 99%

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Determination of Human Powered Helicopter Stability Characteristics using Multi-Body System Simulation Techniques

Brown¹

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Challenges and opportunities of unmanned aerial vehicles as a new tool for crop pest control

Hewitt

Chen

et al. 2023

Pest Management Science

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The application of pesticides is not simply delivering chemicals to the target area. It also involves considering the negative aspects and developing strategies to deal with them during the application process, to ensure the maximization of pesticides use efficiency and the maintenance of the ecosystem. Unmanned aerial vehicle (UAV) sprayers demonstrate unique advantages compared to traditional ground sprayers, particularly in terms of maneuverability and labor intensity reduction, showed great potential for chemical application in pest control. It is undeniable that there exist challenges in the practice of UAV spraying, such as higher potential risks of pesticide drift or pathogen transmission, uncertainty canopy deposition for different crops, and unexpected leaf breakage induced by downwash flow. Maximizing the utilization of downwash flow while avoiding lateral air movement outside the intended target crop area is a major issue for chemical application with UAV sprayers, particularly in light of the increasingly apparent consensus on the need for enhanced environmental protection during the chemical application process. It must be considered that the operation strategy in different scenarios and for different crop targets is not the same, unique requirements should be given on nozzle atomization, flight parameters, adjuvants and aircraft types in specific working situation. In future, the implementation of spray drift prediction, technical procedures development, and other solutions aimed at reducing pesticide drift and improving deposition quality, is expected to to promote the adoption of UAV sprayers by more farmers.This article is protected by copyright. All rights reserved.

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National achievements in control theory

Krotov

Kurzhanski

2005

Annual Reviews in Control

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Flight dynamics and control

Cited by 44 publications

References 3 publications

Determination of Human Powered Helicopter Stability Characteristics using Multi-Body System Simulation Techniques

Determination of Human Powered Helicopter Stability Characteristics using Multi-Body System Simulation Techniques

Challenges and opportunities of unmanned aerial vehicles as a new tool for crop pest control

National achievements in control theory

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