1) Five students designed and built a rocker bogie suspension system inspired by Mars rovers. 2) The rocker bogie system uses linked rocker arms and bogies to lift each wheel over obstacles independently, allowing the rover to traverse rough terrain. 3) Testing showed the design was effective and stable with wheels maintaining contact over obstacles, and the system weight was within motor limits.

1. Sl.No/Roll No:
1)P.Manasadeep(14KB1A0379)
2)O.Sasanka Vardhan(14KB1A0368)
3)T.Vishnu(14KB1A03A3)
4)T.Rakesh(14KB1A03A5)
5)T.Maheswara Reddy(14KB1A0314)
Guided By:
Sri.K.Venkateswarlu,
Asst.Professor.

2. INTRODUCTION:
• The Rocker bogie system is the suspension
arrangement used in Mars rovers
introduced for Mars Pathfinder and also
used on Mars Exploration Rover(MER) and
Mars Science Laboratory(MSL) missions
• This bogie can resist mechanical failures
caused by the harsh environment on MARS
• The primary mechanical feature of the
Rocker Bogie design is it’s drive train
simplicity, which is accomplished by two
rocker arms

3. Objective:
• The need to develop a highly stable suspension system capable of
operating in multi terrain surfaces while keeping all the wheels in
contact with the ground. To design a mechanism that can traverse
terrains where the left and right rockers individually climb different
obstacles.
Rocker & Bogie:
• The term rocker comes from the aspect of larger links on each side of
the system. These rockers are connected to each other and the
vehicle chassis through a differential.
• The term bogie refers to the links that have a drive wheel at each end.

4. SKETCH

5. PRINCIPLE:
• The front wheels are forced against the obstacle by the rear wheels. The
rotation of the front wheel then lifts the front of the vehicle up and over the
obstacle.
• The middle wheel is the pressed against the obstacle by the rear wheel and
pulled against the obstacle by the front, until it is lifted up and over.
• Finally, the rear wheel is pulled over the obstacle by the front two wheels.
During each wheel’s traversal of the obstacle, forward progress of the wheel
is slowed or completely halted.
• These rovers move slowly and climb over the obstacles by having wheels
lift each piece of the suspension over the obstacle one portion at a time.

6. Calculations:
1)Diameter of the wheel:
V=pi*D*N/60
Where
V=velocity assuming it to be 1.5 m/s
N(No. of revolutions)=350 RPM
Then we get
Diameter approximately to 80 mm.

7. Part Sketch:
ROCKER

8. Assembled Part of Rocker Bogie

9. Construction
1) Mechanical
Components:
PVC Pipes
 45 degree Elbow/Bend
 90 degree Elbow/Bend
Nuts and Bolts
Wheels

10. Advantages:
• This mechanism allows climbing obstacles twice the size of wheel
diameter
• Does not employ springs and stub axles.
• Equal distribution of load on all wheels.
• Independent movement of rocker on either sides of the bogie.
• The front and back wheels have individual drives for climbing,
enabling the rover to traverse obstacle without slip.
• The design is simple and reliable.

11. Construction(continued…..)
2) Electronic Components:
• Arduino Uno AT mega 2560.
• DC MOTORS
• L298N MOTOR DRIVERS
• HC-05 BLUETOOTH MODULE

12. OPERATIONAL BLOCK DIAGRAMS
• The connections are shown as per the block diagram. The Bluetooth
module generate the input data, which is the given by the user and the
output is given accordingly to the motors. The motors are driven
through the motor drivers.

13. Performance Evaluation and Metrics:
(yet to be covered)
•Power Consumption.
•Traction and Slip.
•Load Equalization.
•Lateral Stability
•Longitudinal Stability.

14. CONCLUSION:
• The various components of the rocker bogie is assembled and the total
weight of the frames and shaft is calculated to be 1.3Kg.
• In reference to the specification of the DC motor, the allowable net
reaction on the motor is 1.5Kg. Hence the design is safe.
• This is a wide field of study which is very less explored. So this gave
us the motivation for the development of this rocker bogie suspension
system in a cost effective manner.
• In future rocker bogie mechanism can be used in defense related
operations and also in wheelchairs for climbing stairs.

15. FUTURE SCOPE:
• With the development in technology the rover can be used for
reconnaissance purposes with the cameras installed on the rover and
minimizing the size of rover
• By the development of a bigger model it can be used for transporting
humans and material through a rough terrain or obstacles containing
regions like stairs
• It can also be used for geological mapping of unknown terrains as it
can even provide live video feed and images of the terrains being
explored