Dec 1, 2017
The Victors in SCPL’s RoboSumo Tournament!!!
seen from Canada
seen from Chile
seen from India
seen from Canada
seen from Ecuador
seen from United States
seen from Canada
seen from India
seen from United Kingdom
seen from Bulgaria
seen from United States
seen from China
seen from Türkiye
seen from Bulgaria
seen from Türkiye
seen from United States
seen from Romania
seen from Germany
seen from Italy
seen from Maldives
The Victors in SCPL’s RoboSumo Tournament!!!
FIELD OBSERVATION: ROBOSUMO
Building and taking part in a sumo robot battle using the LEGO Education SPIKE Prime kit. (Курсив, маленький)
____________________
The concept was brilliant. We called it ‘The Bucket’. The idea was not just to push the opponent, but to scoop them up from below. The protruding blue beams at the front were designed to work like an excavator bucket — scooping up the enemy, destabilising them and forcing them out of the ring.
It sounded cool. It looked convincing.
____________________
____________________
The ‘Bucket’ design (front view). The robot before the fight. The white SPIKE Prime controller, the blue bucket beams. Note the height at which the ultrasonic sensor is mounted — 10–12 cm from the floor.
____________________
We lost the match.
Our opponent used a classic strategy: dense front blocks, a low centre of gravity and high pressure on the wheels. Four blocks on top — no buckets, no frills. Just a wall. Upon impact, our bucket acted as a lever: the opponent pushed against it, the front of our model was lifted, and the wheels lost traction with the surface.
____________________
____________________
Face-off in the ring (left — the opponent, right — us). On the left is the classic design with a solid front end and a low centre of gravity. On the right is our ‘Bucket’. The moment just before the collision.
____________________
No pressure on the ground – no friction. No friction – no thrust. We were simply rolled over the edge.
____________________
____________________
The moment of ejection (video). The opponent pushes against our bucket, which acts as a lever. The drive wheels lose contact with the ring, we lose traction, and we’re rolled over the edge. The physics of the error in action.
____________________
We got it wrong. Not the idea — the physics.
The SPIKE Prime controller and sensor were positioned at the front and high up. This naturally shifted the centre of gravity forwards and upwards. The front end was already overloaded, and the bucket only made matters worse.
____________________
____________________
Profile of the robot (side view). The forward shift in the centre of gravity and the height of the sensor are clearly visible. It was precisely this high-lever architecture that caused the wheels to lose traction upon contact.
____________________
When the opponent struck it, the drive wheels lifted off the ring. We made ourselves too light.
We positioned the sensor too high — almost 10–12 cm from the floor. In robot sumo, opponents are often low-slung, at 5–7 cm. Our robot could only see its opponent when it was right up close. A sudden movement — wheel spin — led to a loss of stability. It didn’t have time to brace itself for the impact.
And one more thing. We decided against the idea of adding weight to the rear. It seemed that extra weight at the back would impair manoeuvrability — after all, the robots spin round until they find their target, and then head straight for it. The motion sensor is located at the front, and we were worried about creating an imbalance. But that was a mistake. The position of the sensor isn’t affected by where the weight is placed. Weighing down the rear axle would have pressed the drive wheels against the floor — and we wouldn’t have slipped when pushing. Gravity in the sumo ring is more important than motor power.
Our opponent didn’t win because they were more powerful. They had a low, compact front end that kept their wheels in contact with the floor. They targeted our weak spot — and calmly pushed us over the edge.
Speaking of the bucket, incidentally. At major tournaments, elements protruding beyond the hull’s dimensions that come into contact with the ring are often prohibited by the rules. Usually, only the hull’s projection onto the ring is permitted. So our design not only lost on the physics front, but would also have been unlikely to pass the technical inspection. A flat front end isn’t just more reliable; it’s also more compliant with the regulations.
____________________
Fixing the issues:
— Remove the bucket. The front end must be flat and fit snugly against the ring. Black strips at floor level — no protruding levers.
— Shift the weight backwards. The white controller should be positioned across the frame, directly above the rear wheels. The front should be as light as possible.
— Lower the sensor. To a height of 3–4 cm from the floor, so that even a short opponent can be detected 30 cm before a collision.
— Add a time-out to the search algorithm. If the robot spins for more than two seconds and cannot see the target, it should start moving in a square pattern to physically bump into it.
____________________
The battle is lost. The experience is invaluable.
We’ll fix everything in the next version. And ‘Kovsh’ will go down in history not as a failure, but as the first step towards a working machine.
____________________
#Robosumo #GDR
It was made in 2010 For Robosumo battles, now it's perfect for the end of 2015 #robotanimation #robot3d #cinema4d #robosumo #crash #brokrnglas #stupidrobot #robot #2010 #vfx #fx #funnyanimation #funny (w: ITAD Politechnika Poznańska)
It was made in 2010 For Robosumo battles, now it's perfect for the end of 2015 #robotanimation #robot3d #cinema4d #robosumo #crash #brokrnglas #stupidrobot #robot #2010 #vfx #fx #funnyanimation #funny (w: ITAD Politechnika Poznańska)
А здесь #robosumo уже в действии ;) реплики за кадром говорят сами за себя. Роботы работаю автономно, используя датчик цвета (синее поле), ИК или УЗ-датчик для поиска противника #roboclub #lego #robotics #ev3 #mindstorms