IRJET- Quadrotor Modeling and Control using PID Technique

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 2048
Quadrotor Modeling and Control using PID Technique
Amer Hamadi1, Dr. Abdulla Ismail2
1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE
2Professor, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE
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Abstract - Quadrotors are considered nowadays one of the
fastest growing technologies. It is entering all fields of life
making them a powerful tool to serve humanity and help in
developing a better life style. It is crucial to experiment all
possible ways of controlling quadrotors. In this paper a
conventional type of controllers is used which is the PID, to
control the quadrotor attitude angles and altitude. The open
loop system is modeled using MATLAB. Then PID controllers
have been designed and added to the system. The main
objective for this paper is to have stable response for the
system. The results of controlled system simulation at the end
of this paper show that the PID control is an adequate and a
reliable technique for this objective. The system model,
controllers and results are presented at the end of the paper.
Key Words: Quadrotor, PID control, Roll, Pitch, Yaw,
1. INTRODUCTION
UAV (Unmanned Aerial Vehicle) isanaircraftwithouta pilot,
depending mainly on autonomous or remote flight control,
this system is used in recent years in many civil and military
applications, providing many advantages over manned
systems such as reduced cost, no risk on crew for hazardous
missions, maneuverabilityandlongendurance [1]. UAVscan
be classified according to size , range, altitude or number of
rotors , Table 1 shows the possible classification of UAV.
Table -1: UAV Classification
UAV
Size Range Altitude
Wing
Configurati
on
No. of
Rotors
Micro
(MAV)
Close
range
High Altitude
Long
Endurance
HALE
Fixed
Wing
Single
Rotor
Mini
(MUAV)
Short
range
Medium
Altitude Long
Endurance
MALE
Flapping
wing
Multi
rotors
Nano
(NAV)
Medium
Range
Enduran
ce
Blimps
QUAV (Quadrotor UAV) is a Multirotors UAV that is lifted
and propelled by four rotors. It is considered a benchmark
research platform because of its high maneuverability and
simple mechanical structure. Howeverthecontrol designfor
this type of vehicles is a complex task.
2. Quadrotor Modeling
Quadrotors in general use two pairs of identical propellers
(1,3) and (2,4) as described in Figure 1, two turn clockwise
(CW)and two counterclockwise (CCW).Toachievecontrolof
quadrotor , independent variation of the speed of each rotor
is used. [1] The basic Quadrotor motion is defined by using
Euler angles yaw ψ, pitch θ, roll φ and vertical motion z. The
motion in these directions can be achieved by having the
following propeller speed variation: [2]
• Changing the speed of allpropellersatthesametime
will generate vertical z motion as shown in Figure 1 (c,g).
• Changing 2 and 4 propellers conversely will createa
roll φ rotation as shown in Figure 1 (d,h).
• Changing 1 and 3 propellers conversely will createa
pitch θ rotation as shown in Figure 1 (e,f).
• The difference in the counter-torquebetweeneachpairof
propellers will create yaw ψ rotation as shown in Figure 1
(a,b).
Fig -1: Quadrotor motion description- the arrow width is
proportional to rotor speed [3]
In this paper, general assumptions were made that the
quadrotor model is simplified as a rigid body with its
structure distributed symmetrically around the center of
mass. To simplify the model, the hub forces and rolling
moments were neglected.

The system state-space form can be written as =
(X,U)with U inputs vector and X state vector as follows[4]:
State vector
Where x,y,z are position in body coordinateframe,θispitch
angle, φ is roll angle, and ψ is yaw angle
Where U the inputs are:
From above we obtain after simpliﬁcation:
Where b is the thrust, d is drag factor, g is accelerationdue to
gravity, Ixx,yy,zz are inertia moments, l is horizontal
distance from propeller center to CoG, m is overall mass,and
U are control inputs.
Ideally the system derived from the above equation consists
of two subsystems, the Angular and Translation subsystems
as shown in Figure 2.
Fig-2 : The angular and translations subsystems
3. Simulation
In order to validate the presented system equations, a
simulation environment is created under Simulink. The
simulation is based on the full nonlinear model of the
quadrotor presented by the equations in section2.Following
the same analogy of the system in Figure 2 , the system
simulation is implemented on Simulink as shown in Figure3.
Fig-3: System model using Simulink
(1)
(2)
(3)
(4)

The Quadrotor parameters used in the simulation are
summarized in Table 2 [4]
Table -2: Quadrotor Parameters
Parameter Value Parameter Value
Ixx 0.0075 a1 (Iyy-Izz)/Ixx
Iyy 0.0075 a2 Jr/Ixx
Izz 0.013 a3 (Izz-Ixx)/Iyy
l 0.23 a4 Jr/Iyy
d 7.50*10^(-7) a5 (Ixx-Iyy)/Izz
Jr 6.5*10^(-5) b1 l/Ixx
g 9.81 b2 l/Iyy
m 0.65 b3 1/Izz
b 3.13*10^(-5) la 0.23
4. PID Control and System Response
PID controller is considered by far the most predominant
form of control loop feedback mechanism used in industrial
automation because of its remarkable effectiveness and
implementation simplicity.
Four PID controllers were added to the system to control
roll, pitch, yaw and altitude. The roll φ controller can be
implemented as shown in Figure 4.
Fig-4: The roll φ controller
After tuning the values of proportional gain Kp=9 , integral
gain Ki=0, and derivative gain Kd=1 the system step
response is shown in Figure 5.
Fig-5: System step response for the Roll φ controller
PID controllers are implemented for the pitch, yaw and
altitude in the same way.
Tuning Pitch PID gain constants Kp=10, Ki=1, Kd=1, results
in the system step response shown in Figure 6.
Fig-6: System step response for the pitch θ controller
Tuning Yaw PID gain constants Kp=5, Ki=5, Kd=1, results in
the system step response shown in Figure 7.
Fig-7: System step response for the yaw ψ controller

Tuning Altitude PID gain constants Kp=150 , Ki=20,Kd=100
,results in the system step response shown in Figure 8.
Fig-8: System step response for the altitude z controller
The results from above response Figures are summarizedin
Table 3.
Table -3: Comparison of unit step responses for the QUAV
system with PID controllers
Roll
φ
Pitch θ Yaw ψ Altitude
z
Rise Time(sec) 0.4 0.3 0.4 1.7
Settling
Time(sec)
0.45 0.35 2.5 5
Peak
Overshoot (%)
0 0 4 8
Steady State
Error(sec)
0 0 0 4
Examining Table 3 shows us a goodunderstandingofthe PID
control response. The rise time requiredforAltitudeismuch
longer than for the attitude angles which is obvious in real
flight for the Quadrotor, where changing the altitude and
reaching settling time is taking more time than merely
changing the yaw angle, for example, which would take less
than a second. However unlike the attitude angles the
Altitude control has a steady state error and noticeable 8%
Overshoot.
The Rise and Settling times for unit step response for the
Roll and Pitch angles were all under 0.5 second and have
zero overshoot and Steady State Error, while the Yaw angle
required more settling time and response suffer from Peak
Overshoot of 4%.
The PID control is proposed to stabilize the QUAV and
according to the above response results, the proposed
strategy is successfully applied and the controllers are
performing satisfactorily.
Since the system step response is not illustrating the
quadrotor behavior in real flight and to have a better idea of
the response to multiple inputs at the same time, a 3-
Dimentional visualization of the quadrotor, while a
simulation is running, is implemented as shown in Figure 9.
In this system simulation the Quadrotor is following an
arbitrary trajectory of a ramp z input and a sinusoidal signal
in pitch angle.
Fig-9: Simulation for the Quadrotor in 3D space
5. CONCLUSION
In this paper a mathematical model of the quadrotor is
developed and implemented using MATLAB and Simulink.
To stabilize the quadrotor a controller is required to
feedback the output to the inputofthesystem.PIDcontroller
has been selected for thispurpose. FourPIDcontrollerswere
designed and added to the model to control thesystem, After
tuning the controller parameters in MATLAB, the results are
presented and analyzed, the system was successfully
stabilized.
REFERENCES
[1] Luis Rodolfo García Carrillo et al., ”Quad Rotorcraft
Control-Vision Based Hovering”,2011.
[2] Samir BOUABDALLAH et al.,” Design and Control of an
Indoor Micro Quadrotor “2004.
[3] Oualid Araar and Nabil Aouf “Full linear control of a
quadrotor UAV, LQ vs H∞”, 2012..
[4] Samir BOUABDALLAH, “Design and control of
quadrotors with application to autonomous flying”

BIOGRAPHIES
Amer Mahdy Hamadi is a graduate
ofElectronicsandCommunications
Engineering from Al Nahrain
University Baghdad, Iraq.
Currently pursuing his Master’s
degree in Electrical Engineering,
specializing in Control System, at
Rochester Institute of Technology
(RIT), Dubai Campus.
Dr Abdulla Ismail obtained his
B.Sc. (’80), M.Sc. (’83), and Ph.D.
(’86) degrees, all in electrical
engineering, from theUniversityof
Arizona, U.S.A. Currently, he is a
full professor of Electrical
Engineering and assistant to the
President at the Rochester
Institute of Technology, Dubai,
UAE

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