By David J. Peery
Nonetheless proper a long time after its preliminary ebook, this mythical reference textual content on airplane tension research is taken into account the simplest e-book at the topic. It emphasizes easy structural thought, which is still unchanged with the advance of latest fabrics and development tools, and the appliance of user-friendly rules of mechanics to research of plane buildings.
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Extra resources for Aircraft Structures
The spanwise line on which a I out producing torsion is d e d the elastic axis, and the distance3 of this axis from the spars are inversely proportional to their momenta of inertia. ly5edby superimposing the forces produced by torsion about the elastic axis and those produced by loads applied at the elastic axis. The elastic axis for this wing is 12 in. from the front sparJand the torsional moment is the product of the 4,000-lb resultant air load and its moment arm about the elastic axia -. T 2 4,000 X 6 = 24,OOO in-lb The area obtained by projecting the envelope members on the plane of the bulkhead BCDE is 240 sq in.
The air load is assumed to be uniformly distributed along the span of the wing. The diagonal drsg-trim members are wires, with the tension diagonal dective and the other diagonal carrying no load. Sdution. The vertical load of 20 Ibfin. is distributed to the spars in inverse proportion to the distance of the center of pressure from the spars. , and that on the rear spar 4 Ib/h. If the front spar is considered as a free body, as shown in Fig. 21(u), the vertical forces at A and G may be obtained.
12(4. 4 9,930 x 23 5= 0 Example4. The conventional hding-geat shock absorber contsine two teleecoping tubea, 88 shown in Fig. 13(u). 18. from the landing impact iS absorbed by the oil and air. This shock&sorber mechanism, called an deo strut, transmite bending moment through the two telescoped tubes. que li&, are required to reaiat torsion. The l& on the torque links B of the landing gear shown in Fig. 13 are deaired. SduEion. Considering the lower tube and lower torque link 88 a free body, 88 shown in Fig.