This article goals to guide scholars and engineers from the preliminary strategies of touchdown equipment layout via to the ultimate element layout. It presents a hyperlink in touchdown equipment know-how from historic practices to trendy layout traits, additionally contemplating the required airfield interface with apparatus layout.
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20 102 airplane touchdown apparatus layout desk five. three Stroke, in. zero 2 four 6 eight 10 12 14 sixteen 18 20 Calculations of Polytropic Compression Isothermal vol Vth, in. three Polytropic vol V,h TM, in. three p abs, a psi p gage, psi 728. zero 661. three 594. 7 528. zero 461. three 394. 7 328. zero 261. three 194. 6 128. zero sixty one. three 7309 6400 5055 4750 3950 3200 2500 1830 1220 665 258 390 445 564 six hundred 721 890 1,140 1,557 2,335 4,350 11,050 375 430 539 585 706 875 1,125 1,542 2,320 4,335 11,035 Load = 33. 33Pg,Ib 12,500 14,330 17,970 19,500 23,550 29,200 37. 500 51,400 77,300 145,200 368,500 aPab, = gasoline consistent polytropic quantity. (Gas consistent = PV~i,~5 = 390 x 7309 = 2,850,510. ) polytropic curve relies upon both P V T M or P V ~~ being consistent. the previous is used while the gasoline and oil are separated and the latter once they are combined in the course of compression. Calculations of polytropic compression are given in desk five. three. exam of those values exhibits 20 in. stroke may most likely by no means be used for the reason that three 6 eight , five zero zero / five zero , zero zero zero = 7. 37 g will be required. hence, it might be extra acceptable to plan the polytropic compression such that isothermal values are used as much as the 50,000 Ib (l g) deflection; dynamic compression will be thought of simply from that time to completely compressed. therefore, at sixteen. four in. compression, the polytropic air quantity is 181. 4~35 or 1012 in. j , absolutely the strain 1515 psi, and the gasoline consistent 1,534,000. At 20 in. compression, the polytropic quantity is 258 in. three, absolutely the strain 5950 psi, the gage strain 5935 psi, and the burden 197,700 Ib or four g nearly. The latter values are passable in that the strain is less than 6000 psi (a fascinating aim due to seal leakage) and the g forces are approximately correct. Double-Acting surprise Absorber Calculation Double-acting surprise struts increase surprise absorption features in the course of taxi stipulations over tough or unpaved fields. If such stipulations are an incredible element of the aircraft's necessities, then this sort of strut might be thought of in view that its secondary chamber (shown in Fig. five. 26) considerably reduces lots past the static place. they typically have decrease total emciencies than single-acting struts; also they are dearer and slightly heavier. surprise ABSORBER V-22 Fig. five. 26 major touchdown layout equipment surprise 103 STRUT Double-acting surprise absorber (source: Ref. 7). 1) touchdown equipment attachment to airframe for cantilever strut association centerline 2) Drag strut retraction actuator centerline three) Axle centerline for twin-wheel tires and brakes four) Oil cost and bleed plug five) Oil charging valve 6) Oil drain plug 7) eight) nine) 10) eleven ) 12) thirteen) 14) Oil/air separator pistons First-stage damping Second-stage damping cost valve, first-stage nitrogen cost valve, second-stage nitrogen strain gage Brake hydraulic manifold Weight-on wheel swap subassembly V-22 major touchdown apparatus surprise strut designed by way of Dowty Canada Ltd. contains floating pistons to split nitrogen and oil; metering pin offers damping within the first level and orifice damps within the moment level.