2018 Summer Semester Flying Robot Project Team F Article 5May 09, 2018


This week, the structural 3-dimentional diagram for our plane was completed. Adjustment based on computer simulation using XFLR5 were made. The camber of airfoil was compensated for the attachment of elevon and drag rudder assembly. Camber near the wingtip was inverted to balance the plane. Subsequently airfoils used in the simulation were exported and imported in Autodesk Inventor create the structural diagrams. Furthermore, the model used in simulations was modified to make assembly process easier. A gap was made between two main wings to fit the propulsion system in between two largest ribs. In our previous plan, mounting of the fan and the duct, which construct the propulsion system, was done by cutting the central rib and hanging the fan and the duct assembly from it. This method was deemed less favorable because removal of large portion of the rib reduce its strength and make aligning the fabric covering more difficult. The gap will be reinforced with additional rods. Computer simulation was done to confirm that the new model, which takes the gap into consideration, will be able to lift 300g, which is the expected mass of our plane, off at speed of 8m/sec at 3deg angle. The gap was simulated as void which will produce no lift at all. Our model is now complete, and we will be able to move on to actual assembling process. We are planning on building the wing first, because there is basically nothing else. 今週は構造三面図を完成させました。XFLR5を使ったコンピューターシミュレーションにより当節を行った。翼の後ろを延長した分の補正を行い、よく短部分は安定性のために反転キャンバーを付けた。 インヴェンターで翼型を取り込み構造三面図を作成した。 さらにモデルは制作しやすいように改変された。両翼をそのままつなげるのではなく推進部を挟んで取り付けるようにした。以前の案では中央のリブを切り取ってそこにダクテッドファンをぶら下げるようにしていたが、構造強度と、布を張るときのやりにくさを考えるとあまり好ましくないと考えられる。 新しいモデルを使ってコンピュータシミュレーションをさらに行い、速度5m/s、仰角3度で離陸できることを確認した。中央部は揚力がないものとした。 モデルが完成したので次回からは主翼の制作に移る。