Controller Circuit

http://www.cs.cmu.edu/~biorobotics/papers/sbp_papers/integrated1/borenstein_hovercraft.pdf

Creation of a Learning, Flying Robot by Means of Evolution
Abstract
We demonstrate the first instance of a real
on-line robot learning to develop feasible
flying (flapping) behavior, using evolution.
Here we present the experiments and results
of the first use of evolutionary methods for
a flying robot. With nature's own method,
evolution, we address the highly non-linear
fluid dynamics of flying. The flying robot is
constrained in a test bench where timing and
movement of wing flapping is evolved to give
maximal lifting force. The robot is assembled
with standard o®-the-shelf R/C servomotors
as actuators. The implementation is a conventional

steady-state linear evolutionary algorithm.

ROBOT
Five servomotors are used for the robot. They are
arranged in such a way that each of the two wings has
three degrees of freedom. One servo controls the two
wings forward/backward motion. Two servos control
up/down motion and two small servos control the twist
of the wings. The robot can slide vertically on two steel
rods. The wings are made of balsa wood and solar,
which is a thin, light air proof ¯lm used for model
aircrafts, to keep them lightweight. They are as large
as the servos can handle, 900 mm.



http://fy.chalmers.se/~wolff/AWNGecco2002.pdf

Energy-efficient Autonomous Four-rotor Flying Robot
Controlled at 1 kHz
Abstract—We describe an efficient, reliable, and robust fourrotor
flying platform for indoor and outdoor navigation. Currently,
similar platforms are controlled at low frequencies due
to hardware and software limitations. This causes uncertainty
in position control and instable behavior during fast maneuvers.
Our flying platform offers a 1 kHz control frequency and
motor update rate, in combination with powerful brushless
DC motors in a light-weight package. Following a minimalistic
design approach this system is based on a small number of lowcost
components. Its robust performance is achieved by using
simple but reliable highly optimized algorithms. The robot is
small, light, and can carry payloads of up to 350g.



THE FOUR-ROTOR HARDWARE
A. General design
Our flying robot has a classical four rotor design with
two counter rotating pairs of propellers arranged in a square
and connected to the cross of the diagonals. The controller
board, including the Sensors , is mounted in the middle of the
cross together with the battery. The brushless controllers are
mounted on top of the booms. Figure I shows a photograph
of the flying robot. The weight without battery is 219g. The
flight time depends on the payload and the battery. With
a 3 cell 1800mAh LiPo battery and no payload the flight
time is 30 minutes. We measured the thrust with a fully
charged 3 cell LiPo (12.6V) at 330g per motor. With four
motors the maximum available thrust is 1320g. Since the
controllers need a certain margin to stabilize the robot also
in extreme situations, not all the available thrust can be used
for carrying payload. In addition, efficiency drops and as
a consequence flight time decreases rapidly with a payload
much larger than 350g. Because of this we rate our robot for
a maximum payload of 350g.

With a 350g payload, a flight time of up to twelve minutes
can be achieved. The maximum diameter of the robot without
the propellers is 36.5cm. The propellers have a diameter of
19.8cm each. The Sensors used to stabilize the robot are very
small and robust piezo gyros ENC-03R from Murata [14].
The second design iteration of this robot is already functional
but not fully tested and characterized experimentally. This
second version additionally has a three axial accelerometer
and relies on datafusion algorithms, still running at 1kHz,
to obtain absolute angles in pitch and roll.

http://www.societyofrobots.com/robottheory/Energy-Efficient_Autonomous_Four-Rotor_Flying_Robot_Controlled_at_1_Khz.pdf

The ROBUR project: towards an autonomous
flapping-wing animat
Abstract
Flapping-wing flight is not applicable to huge aircrafts, but has a great potential for micro UAVs - as demonstrated by real birds, bats or flying insects. The ROBUR project aims at designing a robotic platform that will serve to better understand the design constraints that this flying mode entails, and to assess its capacity to foster autonomy and adaptation. The article describes the major components of the project, the tools that it will call upon, and its current state of achievement.
Research on flapping flight maneuverability
A generic model of a flapping wing aircraft has been designed, in which lifting surfaces are
modelled by a set of articulated panels (figure 2). In a first stage, this model will be used to
design a simple periodic controller for such a platform by using evolutionary algorithms (figure
3). This controller is expected to generate a periodic, horizontal, flapping flight at a constant
speed.

Physical model used in this project.



http://animatlab.lip6.fr/papers/Doncieux_JMD2004.pdf


Quad-Rotor Flying Robot



New German UAV – microdrone
A high technology very small UAV made in germany by microdrone GmbH. Can reach an altitude of 400m and stay in the sky for 30 minutes



QTAR: Quad Thrust Aerial Robot 2005