By David J. Peery
Suitable for undergraduate scholars, this quantity covers equilibrium of forces, area constructions, inertia forces and cargo elements, shear and bending stresses, and beams with unsymmetrical move sections. extra subject matters contain spanwise air-load distribution, exterior so much at the aircraft, joints and fittings, deflections of constructions, and specific equipment of study. themes related to a data of aerodynamics look in ultimate chapters, permitting scholars to review the prerequisite aerodynamics themes in concurrent courses.
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Additional info for Aircraft Structures
Although viscous tractions exist, they act along the surface of the plate, and therefore have no rearwards component to produce skin-friction drag. Basic concepts and definitions 37 Fig. 14 Pressure on a normal flat plate Parallel flat plate (Fig. 15) In this case, the drag is entirely skin-friction drag. Whatever the distribution of pressure may be, it can have no rearward component, and therefore the form drag must be zero. Circular cylinder (Fig. 9 below) and in a viscous fluid (dotted lines).
E. 26) In this and the previous equation dQ is a heat transfer to a unit mass of gas from an external source. This addition will go to changing the internal energy and will do work. 28) from datum conditions to conditions given by suffix 1, Tl SI= cvln-4- Rln-P D T2 S2 = cvln-4- Rln-P D TD P1 Likewise, TD P2 *Note that in this passage the unconventional symbol S is used for specific entropy to avoid confusion with the length symbols. 32) These latter expressions find use in particular problems.
A 1/5th scale model is tested under dynamically similar conditions in a Compressed Air Tunnel (CAT) working at 10 atmospheres pressure and 15°C. It is found that the load on the tailplane is subject to impulsive fluctuations at a frequency of 20 cycles per second, owing to eddies being shed from the wing-fuselage junction. 5 cycles per second, could this represent a dangerous condition? For dynamic similarity, the Reynolds numbers must be equal. Since the temperature of the atmosphere equals that in the tunnel, 15 "C, the value of p is the same in both model and full-scale cases.