Survey of Active Aeroelastic Control for Flutter Suppression

Aerospace ◽  
2004 ◽  
Author(s):  
Kevin R. Anderson ◽  
Kevin White ◽  
Joe Neal
Keyword(s):  
Structural Strength ◽  
Flutter Suppression ◽  
Current State ◽  
Aeroelastic Flutter ◽  
Structural Forces ◽  
Air Stream ◽  
Bending Modes ◽  
And Control ◽  
Control Surfaces ◽  
Suppression System

Aeroelastic flutter is the potentially destructive aerodynamic vibration of an elastic body in an air-stream. The interactions of aerodynamic, inertial and structural forces cause coupled torsional and bending modes on the aircraft, which can exceed its structural strength. An aircraft’s wing, tail and control surfaces are at the greatest risk of experiencing flutter. The goal of a flutter suppression system is to clear the flight envelope from flutter. This paper provides an overview regarding the current state-of-the-art hardware, techniques and analytical methods used in implementing Active Aeroelastic Control (AAC) in the design of a flutter suppression system.

DEVELOPMENT OF COMPUTERIZED MONITORING AND CONTROL SYSTEM OF THE MOBILE ROBOT’S POSITIONING ON LARGE FERROMAGNETIC SURFACES BASED ON INTELLIGENT TECHNIQUES. COMPLEX OF TASKS OF MONITORING AND AUTOMATIC CONTROL OF MOBILE

2019 ◽  
pp. 37-47
Author(s):  
Yao Yueqin ◽  
Oleksiy Kozlov ◽  
Oleksandr Gerasin ◽  
Galyna Kondratenko
Keyword(s):  
Automatic Control ◽  
Point Of View ◽  
Monitoring And Control ◽  
Large Area ◽  
Monitoring And Control System ◽  
Technical Parameters ◽  
Automatic Control Systems ◽  
Current State ◽  
Computerized Monitoring ◽  
And Control

Analysis and formalization of the monitoring and automatic control tasks of the MR for the movement and execution of various types of technological operations on inclined and vertical ferromagnetic surfaces are obtained. Generalized structure of mobile robotic complex is shown with main subsystems consideration. Critical analysis of the current state of the problem of development of universal structures of mobile robots (MRs) for the various types of technological operations execution and elaborations of computerized systems for monitoring and control of MR movement is done. In particular, wheeled, walked and crawler type MRs with pneumatic, vacuum-propeller, magnetic and magnetically operated clamping devices to grip with vertical and ceiling surfaces are reviewed. The constructive features of the crawler MR with magnetic clamping devices capable of moving along sloping ferromagnetic surfaces are considered. The basic technical parameters of the MR are shown for the further synthesis of computerized monitoring and automatic control systems. Formalization of the tasks of monitoring and control of the MR positioning at the processing of large area ferromagnetic surfaces is considered from the point of view of control theory.

Short Review and opinion: New matter properties and applications based on Hybrids Graphene based Metamaterials

2020 ◽  
Vol 04 ◽  
Author(s):  
A. Guillermo Bracamonte
Keyword(s):  
Short Review ◽  
New Materials ◽  
Design And Synthesis ◽  
Chemical Structures ◽  
Current State ◽  
Potential Applications ◽  
Fundamental Research ◽  
Miniaturized Instrumentation ◽  
And Control ◽  
Conductive Properties

: Graphene as Organic material showed special attention due to their electronic and conductive properties. Moreover, its highly conjugated chemical structures and relative easy modification permitted varied design and control of targeted properties and applications. In addition, this Nanomaterial accompanied with pseudo Electromagnetic fields permitted photonics, electronics and Quantum interactions with their surrounding that generated new materials properties. In this context, this short Review, intends to discuss many of these studies related with new materials based on graphene for light and electronic interactions, conductions, and new modes of non-classical light generation. It should be highlighted that these new materials and metamaterials are currently in progress. For this reason it was showed and discussed some representative examples from Fundamental Research with Potential Applications as well as for their incorporations to real Advanced devices and miniaturized instrumentation. In this way, it was proposed this Special issue entitled “Design and synthesis of Hybrids Graphene based Metamaterials”, in order to open and share the knowledge of the Current State of the Art in this Multidisciplinary field.

scholarly journals Design of Tendon-Driven Manipulators

1995 ◽  
Vol 117 (B) ◽  
pp. 80-86 ◽  
Author(s):  
Lung-Wen Tsai
Keyword(s):  
State Of The Art ◽  
Unique Characteristic ◽  
Current State ◽  
Dynamics And Control ◽  
And Control

This paper presents an overview of the current state-of-the-art in the design of tendon-driven manipulators. A special characteristic associated with tendon-driven manipulators is that tendons can only exert tension but not compression. Based on this unique characteristic, the fundamental mechanics associated with the design of tendon-driven manipulators are reviewed. The review includes structure classification, kinematics, statics, dynamics and control.

scholarly journals Body Flexibility Enhances Maneuverability in the World’s Largest Predator

2018 ◽  
Vol 59 (1) ◽  
pp. 48-60 ◽  
Author(s):  
P S Segre ◽  
D E Cade ◽  
J Calambokidis ◽  
F E Fish ◽  
A S Friedlaender ◽  
...  
Keyword(s):  
Open Ocean ◽  
The Body ◽  
Long Distance ◽  
Active Surfaces ◽  
Aquatic Locomotion ◽  
And Performance ◽  
And Control ◽  
Blue Whales ◽  
Control Surfaces ◽  
Complex Trajectories

Abstract Blue whales are often characterized as highly stable, open-ocean swimmers who sacrifice maneuverability for long-distance cruising performance. However, recent studies have revealed that blue whales actually exhibit surprisingly complex underwater behaviors, yet little is known about the performance and control of these maneuvers. Here, we use multi-sensor biologgers equipped with cameras to quantify the locomotor dynamics and the movement of the control surfaces used by foraging blue whales. Our results revealed that simple maneuvers (rolls, turns, and pitch changes) are performed using distinct combinations of control and power provided by the flippers, the flukes, and bending of the body, while complex trajectories are structured by combining sequences of simple maneuvers. Furthermore, blue whales improve their turning performance by using complex banked turns to take advantage of their substantial dorso-ventral flexibility. These results illustrate the important role body flexibility plays in enhancing control and performance of maneuvers, even in the largest of animals. The use of the body to supplement the performance of the hydrodynamically active surfaces may represent a new mechanism in the control of aquatic locomotion.

Multirate flutter suppression system design for a model wing

1994 ◽  
Vol 17 (6) ◽  
pp. 1267-1274 ◽  
Author(s):  
Gregory S. Mason ◽  
Martin C. Berg
Keyword(s):  
System Design ◽  
Flutter Suppression ◽  
Suppression System

Thrust Enhancement From Radial Velocity in Squid Inspired Thrusters

2012 ◽  
Author(s):  
Michael Krieg ◽  
Kamran Mohseni
Keyword(s):  
Radial Velocity ◽  
Driving Mechanism ◽  
Low Thrust ◽  
Vortex Ring Formation ◽  
Total Impulse ◽  
Fluid Jets ◽  
Force Range ◽  
And Control ◽  
Thrust Production ◽  
Control Surfaces

Squid and jellyfish generate propulsive forces by successively taking in and expelling high momentum jets of water. This method of propulsion offers several advantages to underwater vehicles/robots. The driving mechanism can be placed internal to the vehicle, reducing the drag associated with an abundance of external thrusters and control surfaces. The thrusters can generate accurate predictable forcing in the low thrust range, while still generating thrust nearly instantaneously over the entire force range. Vortex ring formation dynamics play an important role in creating thrust. It is observed that squid and jellyfish eject fluid jets which are not exactly parallel, and have a contracting velocity in the radial direction. A prototype thruster was developed which generates both parallel and converging propulsive jets. The total impulse of the jet is determined from DPIV techniques to determine the effect a non-zero radial velocity had on thrust production. The radial velocity was observed to increase the total impulse of the jet by 70% for low stroke ratio jets, and 75% for large stroke ratio jets.

scholarly journals Obesity. An imbalance of energy or an imbalance of nutrients?

1997 ◽  
Vol 43 (5) ◽  
pp. 47-50
Author(s):  
M. M. Ginzburg ◽  
G. S. Kozupitsa
Keyword(s):  
Diabetes Mellitus ◽  
Coronary Heart Disease ◽  
Type Ii Diabetes ◽  
Developed Countries ◽  
Type Ii Diabetes Mellitus ◽  
Common Disease ◽  
Type Ii ◽  
Current State ◽  
Prevention Therapy ◽  
And Control

Obesity is now the most common disease in the population of economically developed countries, where up to 25% of residents have a body weight that is more than 15% higher than normal [8]. An increase in the incidence rate of about 10% over 10 years is observed [33]. The causal relationship between obesity and arterial hypertension, coronary heart disease, and type II diabetes mellitus is well known [6, 10]. At the same time, the current state of the problem of prevention, therapy and control of relapse of obesity is far from perfect. And this is primarily due to the fact that we do not fully know the pathogenesis of this disease.

scholarly journals Longitudinal Actuated Abdomen Control for Energy Efficient Flight of Insects

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5480
Author(s):  
Titilayo Ogunwa ◽  
Blake McIvor ◽  
Nurkhairunisa Awang Jumat ◽  
Ermira Abdullah ◽  
Javaan Chahl
Keyword(s):  
Energy Efficient ◽  
Insect Flight ◽  
Design Feature ◽  
Unmanned Aircraft ◽  
Longitudinal Control ◽  
Flight Behaviour ◽  
Aerodynamic Control ◽  
The Cost ◽  
And Control ◽  
Control Surfaces

The actuated abdomens of insects such as dragonflies have long been suggested to play a role in optimisation and control of flight. We have examined the effect of this type of actuation in the simplified case of a small fixed wing aircraft to determine whether energetic advantages exist in normal flight when compared to the cost of actuation using aerodynamic control surfaces. We explore the benefits the abdomen/tail might provide to balance level flight against trim changes. We also consider the transient advantage of using alternative longitudinal control effectors in a pull up flight maneuver. Results show that the articulated abdomen significantly reduces energy consumption and increase performance in isolated manoeuvres. The results also indicate a design feature that could be incorporated into small unmanned aircraft under particular circumstances. We aim to highlight behaviours that would increase flight efficiency to inform designers of micro aerial vehicles and to aid the analysis of insect flight behaviour and energetics.

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