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Evaluation on X-Plane Simulator Using Flight Test Data of Light Aircraft KLA100 Scaled Model Conference Paper · November 2016
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Evaluation on X-Plane Simulator Using Flight Test Data of Light Aircraft KLA-100 Scaled Model LV Thang Nguyen1*, Wai Nwe Tun1, Nhu Van Nguyen 1, Maxim Tyan1, Sangho Kim 1, Jae-Woo Lee 1 1
Department of Aerospace Information Engineering, Konkuk University, Seoul, Korea
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Flight simulation, X-plane, Flight test data
Nowadays, flight simulation plays a significant role in
aerospace
science
researches
from
design
development to certification stage and pilot training [1]
Table 1 presents the aircraft components with specification and modelling methods in Plane Maker [4].
[2]. Therefore, the accuracy of flight simulator is
Table 1: Aircraft components and modelling method
extremely important to ensure that the simulator is able Fuselage
to reproduce the real flight path.
Wing and empennage
X-plane is a simple flight simulator, which allows users to model and simulate various types of flight
Landing gear
vehicles including fixed-wing, rotorcraft, UAV or tilting systems. Currently, X-plane can also be used as an engineering tool to predict the flying qualities of flight vehicles [3].
Into cross-sections, frontal drag 2D Airfoil section Control surfaces dimensions
Propulsion system
Location, steering, cycles Reciprocating engine DLEG0031 Output: 3.7hp/8500 rpm Propeller: 18x10
Mass and balance
MTOW: 6.9457 kg CG = [16.5,37.6]%MAC
This research attempts to generate the KLA-100 scaled
model
and
then
simulate
in
X-plane
environments using control input obtained from the recorded flight test data via UDP connection [4]. In order to evaluate the simulator results, the outputs of
Figure 2 illustrates the process to simulate aircraft model using control input data and record the aircraft response in X-Plane.
flight simulation are compared with the aircraft Engine Start
responses in real flight test.
Take Off Climb to Level Flight Condition
The KLA-100 scaled model is generated in Plane Flight Test Data
Maker – a modelling application in X-Plane.
UDP connection
Apply Control Input
Record Aircraft Responses
Figure 2: Simulation process The process starts from manual engine start, takeoff and climb to the cruise altitude in manual or Figure 1: KLA-100 scaled model in Plane Maker
autopilot mode embedded in X-plane. Then, the UDP
-1-
connection is executed to apply control inputs from
simulator
flight test data, which includes control surfaces deflection and throttle setting. The examined time for comparison includes 2 to 4 doublets of control input signal and at stable flight situation. In this case, the analyzed time range is 330s to 370s of a 1000s-flight-time sortie. Figure 3 verifies the accuracy of UDP control input signals to simulator comparing with flight test data. The simulation model uses accurate control inputs from flight test data.
Figure 4: Aircraft responses comparison The developed process has proved its efficiency in accuracy evaluation of X-Plane flight simulator. The process will be extended for analysis of other Flight Simulation software.
This
research
was
supported
by
a
grant
1615001723 from Light Aircraft Development Program funded by Ministry of Land, Transport and Maritime airs of Korean government. Figure 3: Control input signals
[1]
In figure 4, the aircraft simulation response is
R. Khaki, "Dynamic flight simulation of aircraft and its comparison to flight tests," 2015.
compared with recorded real flight test data. It can be [2]
observed that the longitudinal motion of simulated
S. Y. Ong, "Aircraft 6 DOF model validation through flight test," 1998.
aircraft performs good accuracy compared with flight test responses. However, the lateral and directional
[3]
http://www.x-plane.com. [Online].
motion shows higher discrepancy with the test data.
[4]
L. s. a. project, "The KLA-100 RC spin test and W/T test," 2015.3.
X-plane
simulator
shows
good
accuracy
[5]
in
simulation model using flight test data," 2013.
longitudinal flight. However, it is so far inaccurate in other maneuvers due to some limitations:
-
Moments of Inertia cannot be specified explicitly
-
Possible
poor
drag
estimation
inside
A. Dorobantu, "Validating uncertain aircraft
the -2-
