IEEE - Aerospace and Electronic Systems - February 2022 - 28

Modular and Flexible On-Ground Test Bench for Aircraft Electromechanical Actuators
Figure 4.
Flap-tab test bench. (a) CAD model ofone axle. (b) Detailed view of the test bench.
For this purpose, the test bench actuators are
enclosed inside the test structures so that they do not
reach out of the enclosed volume in any working position.
The electrical components were insulated and
earthed to avoid electrical risks, and easy access to the
tested components is guaranteed by design, with the
technicians having easy access to all the A/C actuators
around the testing table.
Besides the aforementioned general design principles,
the test benches had to comply with several mechanical
requirements as follows.
Force/momentum: The test actuators, hydraulic circuit,
and the geometry of the test benches were
designed and dimensioned to be able to represent
real in-flight conditions and oppose their EMA
counterparts being tested. The hydraulic circuit is
limited by pressure and flow control valves in order
to avoid any overloads or accidents.
Inertia: The mass of the spinning axles and their
geometry were calculated to match the real inertias
that the A/C actuators have to bear in real conditions.
Different configurations can be tested by
changing the dead weights attached to the axles.
Speed/frequency response: The speed/frequency of
the load variations and displacement variations produced
by the test benches are in accordance with
the specifications provided.
Stroke/displacement/angle: The stroke, linear displacement,
or angle rotated of the spinning axles,
required by the A/C actuators to be tested, are similar
to those of the in-flight conditions.
Endurance: The test benches were designed for
long-lasting endurance tests.
28
Figure 5.
Detailed view of the load cell and RVDT sensor placed on the
bench.
IEEE A&E SYSTEMS MAGAZINE
FEBRUARY 2022
Stiffness: The structures were designed, calculated,
and tested to obtain a general stiffness similar to
those of the real A/C.
The test benches consist of several spinning axles that
oppose the A/C actuators with hydraulic conventional test
actuators, and the axles have dead weights attached that
provide the required inertia. Figure 4 shows the CAD
model one of the axles of the flap-tab test bench where
two A/C actuators oppose a test hydraulic actuator and a
detailed view of the mechanical test bench developed.
In order to control the position of the axles, rotary variable
differential transformers (RVDT) are installed similar
to the ones that A/C carry onboard. The load applied
by the test actuators is constantly monitored by integrated
load cells, an example of whose configuration can be
found in Figure 5.

IEEE - Aerospace and Electronic Systems - February 2022

Table of Contents for the Digital Edition of IEEE - Aerospace and Electronic Systems - February 2022

Contents
IEEE - Aerospace and Electronic Systems - February 2022 - Cover1
IEEE - Aerospace and Electronic Systems - February 2022 - Cover2
IEEE - Aerospace and Electronic Systems - February 2022 - Contents
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