This
Multi-Purpose Convertible System Enhances Aircraft Maintenance Productivity
And Drastically Reduces Aircraft Cleaning Time
Every
aircraft in use today by military and civilian operators contain large
exterior surface areas that have to be painted, de-painted, washed,
and polished at regular intervals.
Traditionally,
maintenance of the aircraft's exterior surfaces has been a manual process
that consumes an inordinate amount of man-hours of labor. Part of the
reason for this is the complex shape of the typical plane… it does not
render itself to easy mechanized maintenance.
Very
recently, foreign airlines have developed two radically different approaches
to attempt a solution to this difficult problem. One such system employs
over 20 car-wash type cylindrical brushes controlled by a dozen computers
within a basically fixed structure. The other device utilizes a single
car-wash type brush attached at the end of a 100-foot, multi-jointed
extension boom.
The
aforementioned systems are limited to a single area of aircraft maintenance
washing.
A Creative Departure
By
contrast SAAMS, a semi-automated aircraft maintenance technology, is
a practical and innovative American solution to the same challenging
problem. SAAMS delivers a high technology system versatile enough to
perform washing, painting, de-painting, polishing, and perhaps even
inspections.
It
is simple in concept and implementation-using off-the-shelf technology.
The
practical SAAMS solution is to bring the Working Robotic Tool up close
to the aircraft. This novel approach results in system architecture
that is simpler, more versatile, and superior in performance to the
existing mechanized equipment.
The
basic elements of SAAMS are comprised of:
a) low profile transporter platform;
b)
extendible Maintenance Cantilevered Arm
c)
programmable Robotic Manipulator with 6-degree freedom of motion, and
d)
a Working Tool attached to the Manipulator's wrist.
The
principles of SAAMS are described below and can be illustrated in various
configurations.
Exhibits
1 and 2 represent an artist's rendition of one such functional design
that illustrates:
a) Transporter Platform - a low-profile, self propelled, maneuverable
platform that can move under and around an aircraft and will respond
to an operator's remote joy stick commands, or follow navigation instructions
from a stored computer program, using embedded RF signals or laser triangulation
as reference points, and
b)
Maintenance Cantilever Arm - a "stand-alone" mechanism that
is attached to the top of the Transporter. Common mechanical and electrohydraulic
actuators are utilized to control the vertical position of the Cantilever
Arm, the horizontal extension, and tilt angle from the ground place.
The function of the Cantilever Arm is to bring the Manipulator to that
point near the aircraft's surface where the Working Tool will have optimum
effective coverage. Advantage...required positioning is reduced to linear
motion within a single vertical plane. Refer to artist's rendition in
Exhibits 1 and 2, which is ample proof of the streamlined implementation
of these functions.
c)
The Manipulator - Enough can't be said of the pragmatic engineering
solution represented by SAAMS. One competing system took 20 years to
develop a robotic Manipulator that has a 100-foot reach. SAAMS, on the
other hand, will take an industrial, off the shelf, 6 degree-of-freedom
manipulator with a 6-foot reach and position it close to the aircraft.
What's more, the very same Manipulator can handle a variety of tools
to perform other needed operations. In other words, it is not limited
to aircraft washing alone.
d)
Aircraft Cleaning Tool - SAAMS has departed from the expedient approach
of adopting a cylindrical, car wash type brush for aircraft. A unique
Cleaning Tool is being developed for SAAMS incorporating compact, counter-rotating
rollers with a pneumatic core. This arrangement will allow the lightweight
cleaning tool to conform to the aircraft's curved surfaces.
Compact
rollers will be able to reach tight areas in the wing and vertical fin
fillet areas.