chapter_5_part_2

chapter_5_part_2 - 15-7 Chapter 15: Homework Problems 5.3...

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Chapter 15: Homework Problems 15-7 5.3 Below is a wind turbine with a single blade. There advantages and disadvantages to using a single blade, but initially, we just want to estimate some of the forces. On a given day, we will assume that the thrust force on the blade (Fd is approximately 40 N. For an airfoil, this would be similar to the drag force. The lift force (F 2 ) is then what causes the blade to rotate. In this case, it is approximately 250N. If d[ = 20 m, d 2 = 60 m, and d 3 = 4.5 m and the forces act in the x - y plane, what is the resultant force on the blade due to the wind? Sketch the vector in the x - y plane and determine the magnitude and the angle it makes with the x axis. z F, d 1 y x ~=- I
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15-9 5.5 Revisiting the gusset plate problem. Assume that 0 1 = 50°, O 2 = 40°, 0 3 = 55°, and 0 4 = 35°. The forces are F 1 = lOkip, F 2 = 20kip, F 3 = 70kip, F 4 = 35kip, F s = 35kip. Determine the resultant force acting on the gusset plate. Calculate its
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chapter_5_part_2 - 15-7 Chapter 15: Homework Problems 5.3...

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