Aerospace & Defense Technology - May 2021 - 31

Tech Briefs

optimal power consumption of the system. This led to the introduction of a parallel mechanism. Development and testeing of a two-axis decoupled solar tracking
system based on a parallel mechanism
showed that the tracker requires less driving torque, thus less power consumption
than is found with a conventional serial
tracker. Complexity and weight of the
system are also reduced.
A parallel mechanism is a good one for
saving energy in the system. Parallel
mechanisms have a large payload to
mass ratio and high stiffness. It is possible to reduce the driving torque, scale
down the dimension of the mounting
and reduce the complexity of the system.
When a parallel mechanism is attached
to the fixed platform, the dynamic effect
would not have much impact on the system. Nevertheless, dynamic effect should
be considered when a parallel mechanism is attached to a moving platform.
The moving platform can be a boat, an
aerial vehicle, a land vehicle etc.
The primary purpose of this work is to
develop a dynamic model that can describe and simulate the change in orientation of a solar panel subjected to external forces. The solar panel is attached to
a 2DOF parallel mechanism upon which
loads are externally applied to change
the panel orientation. The parallel
mechanism was chosen because it has
been proven to be energy efficient. The
equation of motion of the system will be
derived by determining the constraint
reaction force exerted by each kinematic
link so that the behavior of the configuration can be investigated. Due to the effect of external forces acting on the linear actuator, the movement of the solar
panel would be observed. The result
from this work lays the groundwork for
controlling the orientation of a solar
tracker to obtain optimal solar energy.
Another purpose of this work is to
study the dynamics behavior of the parallel mechanism mounted UAV. The attitude of a hexacopter is simulated at the
hover point and during its mobility when
the parallel mechanism has motion. First,
the inverse kinematic equations for a parallel mechanism were derived, which
produced the stroke of the linear actuators as a driver to movability of the parallel mechanism. To describe the behavior

of the whole system, dynamic modeling
was derived. Simulation for a pararllelmechanism-mounted UAV was used to
validate the dynamic motion.
This work was done by Sarot Srang of the
Institute of Technology of Cambodia for the

Air Force Office of Scientific Research. For
more information, download the Technical Support Package (free white
paper) at www.aerodefensetech.com/tsp
under the Unmanned Vehicles & Robotics category. AFOSR-0011

Free Info at http://info.hotims.com/79413-778

Aerospace & Defense Technology, May 2021

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http://www.aerodefensetech.com/tsp http://info.hotims.com/79413-778 http://www.abpi.net/ntbpdfclicks/l.php?202105ADTNAV

Aerospace & Defense Technology - May 2021

Table of Contents for the Digital Edition of Aerospace & Defense Technology - May 2021

Aerospace & Defense Technology - May 2021 - Intro
Aerospace & Defense Technology - May 2021 - Sponsor
Aerospace & Defense Technology - May 2021 - Cov1
Aerospace & Defense Technology - May 2021 - Cov2
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Aerospace & Defense Technology - May 2021 - Cov3
Aerospace & Defense Technology - May 2021 - Cov4
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