tailieunhanh - Autonomous Underwater Vehicles Part 4

Tham khảo tài liệu 'autonomous underwater vehicles part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hydrodynamic Characteristics of the Main Parts of a Hybrid-Driven Underwater Glider PETREL 49 Results and discussion The orthogonal experiment shows that glide efficiency is most significantly influenced by the chord length while stability of the vehicle is most remarkably affected by the sweep angle. Further numerical calculations based on four specific models with the attack angle in the range of 0 -20 indicate that location of the wings mainly affects glide stability but has little influence on glide efficiency. When the vehicle glides at about 6 attack angle it has the maximum ratio of lift to drag. The range of the hybrid glider with the same configuration as PETREL will be decrease 10 35 compared with the legacy gliders. 4. Rudder hydrodynamic design 22 Rudder parameters The rudders parameters include root chord half span aerofoil and backswept which are shown in Figure 13. As defined in the 23 the chord is denoted by C the distance from the leading edge to trailing edge in a given two-dimensional section. The chord is measured in parallel with the section at the root of the rudder. In general the chord can vary along the span in which case the geometric mean chord C is used in computations unless noted 21 . The C is defined based on Figure 14 as C Ct Cr 2 10 foil section Tip chord Ct semi-span b 2 traili ading edge oot Chord Cr Fig. 13. Rudders parameters Fig. 14. Foil section and hydrodynamic force 50 Autonomous Underwater Vehicles The semi-span denoted by b 2 measures the distance from the rudder root to tip along the line perpendicular to the root section. The span in this work is twice as long as the root-to-tip distance for an isolated plan. The hydrodynamic forces including lift and drag acted on the aerofoil is shown in Figure 14 and can be expressed as L 1 2 pCLAV 11 D 1 2 pCDAV2 12 Here p is the density of the water CL is the lift coefficient CD is the drag coefficient A is the area of rudder V is the velocity of water a is the angle of .

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