Tohoku University Open-Class "Sekiguteam"
[CanSat name]
KORIKI
Teacher:Kazuya YOSHIDA, Keiji NAGATANI, Yuji SAKAMOTO
Member: Akihiro SEKIGUCHI (leader), Katsuhisa YAMANA (sub-leader)
Kazunori HASHIMOTO, Eriko UJIIE, Dan LI
[CanSat Introduction]
We made our rover "KORIKI" after studying last year rover "NOKO-NOKO". Last year, NOKO-NOKO exhausted its battery 222 [m] short of goal, so we couldn't achieve full victory. Because of this lesson, we tried to reduce consumption of electricity.
[Result]
Details of the measures are
/Development of wheels which have high traversability and don't disturb rover's running
/Use of two parachute (big one and small one)
/Use of the battery which has large capacity
The most important point we contrived is use of two parachutes. The reason why NOKO-NOKO exhausted its battery is that it was blown and landed at about 4 [km] from goal. So this year we apply a new technique. The technique is that we fall rover fast with small parachute and make it open big parachute just before landing. Because rover can land near goal by using this technique, rover can reduce consumption of electricity.
In ARLISS trial, rover wasn't ejected from rocket so rover fell freely with rocket. And rover was ejected from rocket just before rocket crashed into the ground. Because small parachute worked as jumping-parachute, big parachute could barely open. But rover's bearing of left wheel was warped when it landed because falling speed was fast. For this accident, left wheel couldn't make turn well so rover advanced to left of the goal. However by grace of integral gain, rover gradually advanced to the goal. Finally rover realized goal position and it stopped at 6 [m] from the goal.
[Impressions]
We aren't satisfied with the result though our team accomplished the full victory. We think that it was possible to put out a better result if we tried to measure the position of the goal by GPS again on the morning of that day of the competition. Moreover, because the release of the rover from the rocket has been delayed, we couldn't try the mechanism of two parachutes steps. I'd like to entrust these points to juniors who will challenge in the coming year.
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