A detailed description about soccer and hockey car
As far as I observed in WRC , I found some demerits in the structure
of model we made for the Robo Soccer Competition, and as we will be
again participating in ZRC 2025, I would like to give design in my
mind. So at first-
1. We should have broader edges of clamps(More area) of car as in
WRC we had pointed edges of clamps (less area) due to which our
clamps are being stuck in the mat.
According to the equation,
Pressure =Force / Area
Pressure is inversely proportional to area so if the area of clamps will be
less then they will apply more pressure on mat will will cause them to stuck
in mat and probably mat can also be torn so we have to increase the area
of clamps by broadening its both sides edges so as to perform smooth
movements.
2. We should have our clamps wielded with our chassis rather than
attaching them separately with the chassis through a single nut bold.
We can't use a single nut bolt to hold the chassis with the clamps
together as at that moment the clamp will be not be the part of the
chassis and is just supported by the single nut bold which can attach
the clamps with chassis but only temporarily as after numerous
collisions it is sure that the nut bold which is holding the clamps will
get loosen and it requires frequent tightening and maintenance , and
shaky movement of clamps will occur and it is sure that at some
moment when our car will get direct hit on our clamps then the
clamps will be bent downward which result in causing the clamps to
dive into mat causing the disruption in the movement of the car (
shaky movement , jerky movement, etc) which compromises the
vehicle's handling and stability.
While using a clamps that are wielded with the chassis then the
clamps being the part of the chassis will reduce the chances of
bending of the clamps during collisions but one thing is sure that as
no nut bolt is there so there is no fear of loosening nut bolt , as the
clamps are already a part of chassis so the clamps won't dive in mat
during match and will require less maintenance.
But it also depends on the material of the clamps, height from
base and angles of clamps at which they are inclined.
3. A low center of gravity (CG) significantly enhances the stability of an
object, including a robot. We can reduce CG by :
● Minimizing overall height of the car body as much as possible.
● Keeping heavy components close to centre or if possible then
at the centre.
● Opt for lightweight electronics and other components.
● Avoid stacking components on one another as it will increase
CG.
● Place components strategically to minimize their vertical height.
An object is considered stable when an imaginary vertical line drawn from
its center of gravity falls within its base of support and a larger base of
support and a lower CG both contribute to greater stability.also low center
of gravity improves stability and along with it reduces the risk of tipping over
during collisions.
4. Angle of inclination of clamps matters in attacking and defending too
● Attacking: - What we do in attacking is that we have to force the
ball from any point in field to the opponent’s goal so during this
time the opponent can come in our way obstructing our parth so
our clamps design would be like this that the opponent’s car
would collide into our car and due to perfect angle of clamps
they would just easily be lifted by our clamps and we can easily
get past through obstructed path.And lesser the angle , lesser
will be the effort applied by opponents car to get onto our cars
clamps and get past above it. So according to me the best
angle depends on the size and height of the chassis.
● Defending:- We usually stop the attakers of the opponent team
to get into our goal before the goalkeeper defends the ball and
for this less angle inclination won't work as if we collide they will
just use our less angle inclination as advantage and get past
through above and secure a goal. So we have to increase the
angle of inclination so more effort the opponent car needs to get
onto our clamps and as they could not get onto our clamps then
our car will do nothing but to push the opponent out of the reach
of goal.
● As per my suggestion we should build chassis for cars for
different roles as per the above structures.
● As of my observation the perfect angle for Attacking would be
45 degree and for defense would be 60 degree
5. Broad and less diameter tyres should be used as they have
advantages and disadvantages too.
Advantages:
Increased traction: Provides better grip especially on slippery or uneven
surfaces.
Improved stability: Reduces the risk of tipping over particularly at high
speeds or on inclines.
Reduced maneuverability: Can make it harder to turn sharply which is
needed as out model take quick turn which require quick action for perfect
turn so increased difficulty in sharp turn is advsntage for us.
Disadvantages:
Increased rolling resistance: Requires more power to move the robot.
6. High torque and rpm motor should be used.
7. Proper weight distribution is crucial for a robot car's stability, handling,
and overall performance.
● Place heavy components closer to the center of the car to lower
the center of gravity.
● Consider the weight distribution of lighter components like
sensors and wiring.
● symmetrical chassis ensures even weight distribution.
● A rigid frame can help maintain weight distribution under stress.
8. Rubber tires should be used as they have perfect grip on the uneven
surface.
9. Material of chasiss should be very solid and powerful.
