scholarly journals Biomimetic sensor suite for flight control of a micromechanical flying insect: design and experimental results

2004 ◽  
Author(s):  
Wei-Chung Wu ◽  
L. Schenato ◽  
R.J. Wood ◽  
R.S. Fearing
Keyword(s):  
Flight Control ◽  
Experimental Results ◽  
Micromechanical Flying Insect ◽  
Biomimetic Sensor ◽  
Sensor Suite

scholarly journals Dynamics of Micro-Air-Vehicle with Flapping Wings

10.14311/526 ◽  
2004 ◽  
Vol 44 (2) ◽  
Author(s):  
K. Sibilski
Keyword(s):  
Flight Control ◽  
Computational Models ◽  
Inertial Sensors ◽  
Early Stage ◽  
Micro Air Vehicles ◽  
The Body ◽  
Flapping Wings ◽  
Control Algorithms ◽  
Micromechanical Flying Insect ◽  
And Performance

Small (approximately 6 inch long, or hand-held) reconnaissance micro air vehicles (MAVs) will fly inside buildings, and require hover for observation, and agility at low speeds to move in confined spaces. For this flight envelope insect-like flapping wings seem to be an optimal mode of flying. Investigation of the aerodynamics of flapping wing MAVs is very challenging. The problem involves complex unsteady, viscous flow (mainly laminar), with the moving wing generating vortices and interacting with them. At this early stage of research only a preliminary insight into the nature of the little known aerodynamics of MAVs has been obtained. This paper describes computational models for simulation of the controlled motion of a microelectromechanical flying insect – entomopter. The design of software simulation for entomopter flight (SSEF) is presented. In particular, we will estimate the flight control algorithms and performance for a Micromechanical Flying Insect (MFI), a 80–100 mm (wingtip-to-wingtip) device capable of sustained autonomous flight. The SSEF is an end-to-end tool composed of several modular blocks which model the wing aerodynamics and dynamics, the body dynamics, and in the future, the environment perception, control algorithms, the actuators dynamics, and the visual and inertial sensors. We present the current state of the art of its implementation, and preliminary results. 

An Experimental and Theoretical Investigation of Wave Propagation in Teflon and Nylon Tubing With Methods to Prevent Aliasing in Pressure Scanners

2013 ◽  
Vol 135 (10) ◽  
Author(s):  
Adam M. Hurst ◽  
Joe VanDeWeert
Keyword(s):  
Frequency Response ◽  
Transmission Lines ◽  
Flight Control ◽  
Dynamic Pressure ◽  
Sampling Rate ◽  
Aircraft Design ◽  
Experimental Results ◽  
Analytical Models ◽  
Experimental Frequency ◽  
Nylon Tubing

Accurate static and dynamic pressure measurements provide the feedback needed to advance gas turbine efficiency and reliability as well as improve aircraft design and flight control. During turbine testing and aircraft flight testing, flush mounting pressure transducers at the desired pressure measurement location is not always feasible and recess mounting with connective tubing is often used as an alternative. Resonances in the connective tubing can result in aliasing within pressure scanners even within a narrow bandwidth and especially when higher frequency content dc to ∼125 Hz is desired. We present experimental results that investigate tube resonances and attenuation in 1.35 mm inner diameter (I.D.) (used on 0.063 in. tubulations) and 2.69 mm I.D. (used on 0.125 in. tubulations) Teflon and Nylon tubing at various lengths. We utilize a novel dynamic pressure generator, capable of creating large changes in air pressure (<1 psi to 10 psi, <6.8 kPa to 68.9 kPa), to determine the frequency response of such tubing from ∼1 Hz to 2800 Hz. We further compare these experimental results to established analytical models for propagation of pressure disturbances in narrow tubes. While significant theoretical and experimental work relating to the frequency response of connective tubing or transmission lines has been published, there is limited literature presenting experimental frequency response data with air as the media in elastic tubing. In addition, little progress has been made in addressing the issue of tubing-related aliasing within pressure scanners, as the low sampling rate in scanners often makes postprocessing antialiasing filters ineffective.

scholarly journals Swing-Reducing Flight Control System for an Underactuated Indoor Miniature Autonomous Blimp

2020 ◽  
Author(s):  
Qiuyang Tao ◽  
Junkai Wang ◽  
Zheyuan Xu ◽  
Tony X. Lin ◽  
Fumin Zhang
Keyword(s):  
Control System ◽  
Flight Control ◽  
Experimental Results ◽  
Flight Control System ◽  
Station Keeping ◽  
Aerodynamic Shape ◽  
Stabilization Control ◽  
3D Space ◽  
Waypoint Navigation

<div>This paper presents the first swing stabilization control for indoor miniature autonomous blimps (MABs). Indoor MABs are safe to operate in close proximities to humans and can fly for multiple hours, but swing oscillation is commonly observed due to their underactuated design and unique aerodynamic shape. In this paper, we analyze the flight characteristics of indoor MABs, and describe the design of the swing-reducing flight control system in detail. Key mechatronic designs for swing-stabilization control are also presented. Experimental results show that the proposed controller can keep the blimp travel at the desired velocity while effectively stabilizing the swing oscillation. The swing-reducing velocity controller is then expanded for station keeping and waypoint navigation in 3D space.</div>

Stiffness Calculation and Predetermined Preload Optimal Design of Cable Control System

2011 ◽  
Vol 311-313 ◽  
pp. 2452-2456
Author(s):  
Chun Ning Yang ◽  
Yu Qiang Mu ◽  
Zheng You
Keyword(s):  
Control System ◽  
Optimal Design ◽  
Control Systems ◽  
Flight Control ◽  
Design Parameter ◽  
Main Type ◽  
Experimental Results ◽  
Flight Control System ◽  
Numerical Example ◽  
Important Design

The stiffness of cable flight control systems is one of the most important design parameter for aviation aircraft, because it can change the characteristic of control stick and influence the maneuverability and stability of the flight control system. Flexible cable control system is the main type of mechanical flight control system, in which movement can only be transmitted by cable in tension, the stiffness of cable control system is affected mainly by predetermined preload(PP), however the excessive PP would increase friction between cable and pulley which leads pilot an unfavorable maneuver. In this paper, the theoretical stiffness calculation of cable control system with the complex cable braided construction has been calculated and discussed, in addition the effects of cable deflection and linkage pulley are taken into account to obtain a precise stiffness calculation, and also the predetermined preload related to friction is studied through numerical example, as well as the numerical results have been compared with the experimental results.

scholarly journals Swing-Reducing Flight Control System for an Underactuated Indoor Miniature Autonomous Blimp

2020 ◽  
Author(s):  
Qiuyang Tao ◽  
Junkai Wang ◽  
Zheyuan Xu ◽  
Tony X. Lin ◽  
Fumin Zhang
Keyword(s):  
Control System ◽  
Flight Control ◽  
Experimental Results ◽  
Flight Control System ◽  
Station Keeping ◽  
Aerodynamic Shape ◽  
Stabilization Control ◽  
3D Space ◽  
Waypoint Navigation

<div>This paper presents the first swing stabilization control for indoor miniature autonomous blimps (MABs). Indoor MABs are safe to operate in close proximities to humans and can fly for multiple hours, but swing oscillation is commonly observed due to their underactuated design and unique aerodynamic shape. In this paper, we analyze the flight characteristics of indoor MABs, and describe the design of the swing-reducing flight control system in detail. Key mechatronic designs for swing-stabilization control are also presented. Experimental results show that the proposed controller can keep the blimp travel at the desired velocity while effectively stabilizing the swing oscillation. The swing-reducing velocity controller is then expanded for station keeping and waypoint navigation in 3D space.</div>

scholarly journals Swing-Reducing Flight Control System for an Underactuated Indoor Miniature Autonomous Blimp

2020 ◽  
Author(s):  
Qiuyang Tao ◽  
Junkai Wang ◽  
Zheyuan Xu ◽  
Tony X. Lin ◽  
Fumin Zhang
Keyword(s):  
Control System ◽  
Flight Control ◽  
Experimental Results ◽  
Flight Control System ◽  
Station Keeping ◽  
Aerodynamic Shape ◽  
Stabilization Control ◽  
3D Space ◽  
Waypoint Navigation

<div>This paper presents the first swing stabilization control for indoor miniature autonomous blimps (MABs). Indoor MABs are safe to operate in close proximities to humans and can fly for multiple hours, but swing oscillation is commonly observed due to their underactuated design and unique aerodynamic shape. In this paper, we analyze the flight characteristics of indoor MABs, and describe the design of the swing-reducing flight control system in detail. Key mechatronic designs for swing-stabilization control are also presented. Experimental results show that the proposed controller can keep the blimp travel at the desired velocity while effectively stabilizing the swing oscillation. The swing-reducing velocity controller is then expanded for station keeping and waypoint navigation in 3D space.</div>

Diagnostics of Gold Laser Plasmas

1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Pure Gold ◽  
Electronic Temperature ◽  
X Ray ◽  
Laser Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.

Observation of Phase Contrast Images in STEM and CTEM Modes by Using 100 kV Field Emission Electron Gun

1974 ◽  
Vol 32 ◽  
pp. 390-391
Author(s):  
Y. Harada ◽  
T. Goto ◽  
H. Koike ◽  
T. Someya
Keyword(s):  
Field Emission ◽  
Phase Contrast ◽  
Image Formation ◽  
Fresnel Diffraction ◽  
Experimental Results ◽  
Electron Gun ◽  
Scanning Microscopy ◽  
Emission Electron ◽  
Lattice Images

Since phase contrasts of STEM images, that is, Fresnel diffraction fringes or lattice images, manifest themselves in field emission scanning microscopy, the mechanism for image formation in the STEM mode has been investigated and compared with that in CTEM mode, resulting in the theory of reciprocity. It reveals that contrast in STEM images exhibits the same properties as contrast in CTEM images. However, it appears that the validity of the reciprocity theory, especially on the details of phase contrast, has not yet been fully proven by the experiments. In this work, we shall investigate the phase contrast images obtained in both the STEM and CTEM modes of a field emission microscope (100kV), and evaluate the validity of the reciprocity theory by comparing the experimental results.

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