The Design Of The Lade
Blade structure design of the main work is according to the overall design and aerodynamic design and the parameters of the helicopter, helicopter is designed to meet tactical technical requirements and overall technical requirements of blade structure. Blade structure design to meet the blade aerodynamic shape, rotor dynamics, fatigue and strength, reliability and maintainability, manufacturability and economy requirements, etc.
Blade structure design of main work include:
(1) The blade material design, lect material determine blade materials system and variety.
(2) Tbyobhe blade configuration design, determine the structure of the blade profile typical forms, joint form and main structure size.
(3) Blade layer design and structure parameters are calculated.
(4) The blade structure detail design.
Blade of the main girder, skin structure, after a period of parts and connectors. In addition, there is blade tip cover, rear adjustment piece, front bag piece, balance weight, etc. Blade configurations by early wood blade, blade hybrid structure, the metal blade, metal and composite materials mixed blade structure and development of the whole composite blade, to date, most advanced helicopter blades with composite materials. Blade configuration is mainly according to the shape of the blade material and supporting as well as the joint form to differentiate, blade configuration design, want to consider domestic blade development and industry technical accumulation, the basis of reasonable lection of blade configurations.
1. The metal blade configurations
埃里克 斯波尔斯特拉>adeptMetal blades are usually made of girder, joint, in the back cover and the blade tip, trailing edge adjustment piece, front bag piece, such as balance weight zero components. According to the shape of the girder and the forming process is different, can be divided into the hollow extruded beam blade, C shape extruded beam blade, illustrated the paddle blade and a clod cavity composite beams.
(1) Extrusion hollow beam
Extrusion hollow girder according to blade design requirements, the girder extrusion into D beam, can be squeezed into trapezoidal beam. Usually the shape of the hollow beam by mechanical processing and become, form the front of the oar Ye Yi type. The configuration of the blade good torsional stiffness, beam can be individually under complex load of blade. Hollow beam are usually made of aluminium alloy extrusion forming, inner surface son what shape and surface quality of the girder by extrusion technology guarantee, usually inner surface and girder as the surface processing benchmark. Therefore, extruded beam inner cavity size and high surface quality requirement, manufacture process is difficult.
(2) sokuC shape extruded beam girder (C)
C girder is generally made by aluminum alloy extrusion forming, surface after machining. C beam form at the front part of the airfoil, upper and lower surface constitute a part of the airfoil surface. C beam inner surface is open (concave), surface processing
and quality inspection. Becau C beam rear openings, low torsional rigidity of girder, often need to skin (or shape wall) or Ⅱ girder together constitute a single or double clod cavity clod load-carrying structure.
(3) Illustrated the blade
Illustrated by alloy steel or commonly qin alloy extrusion forming, cross ction shape according to the requirements of blade overall configuration and the bearing can be round or oval. Steel of high strength, modulus, impact toughness is better, but better than strength, modulus and aluminum alloy.
北京贵族学校(4) roughnessOther forms
More clod cavity composite beam is compod of steel plate bending forming C shape, D beam element, by welding or bonding of clod cavity load-carrying structure. Girder for stainless steel plate after forming glue connect together to form more clod cavity beam.
巴黎时装秀背景音乐 2. Composite blade configurations
Composite blade configuration mainly bad on the typical ction girder structure, mainly including c girder single clod cavity, D beam double clod cavity structure with more clod cavity, etc.
(1) C girder single clod cavity structure
Is usually the most simple profile structure C shape beam single clod cavity structure, the structure is simple and good manufacturability. This configuration is similar to metal C shape beam structure, becau it is open at the back of the C shape beam structure, ction low torsional rigidity, for blade chord length is larger, after airfoil ction area skin and bonding strength of filling material is the structure design of the difficulty, so this kind of configuration is usually suitable for medium and small helicopter blades.
willy (2) D beam double clod cavity structure
Single clod cavity structure stiffness and strength is relatively low, for blade chord le
ngth is larger, followed by regional skin and filler material knot strength to demand higher, can u double clod cavity structure. Double clod cavity D C beam girder structure is relatively single clod cavity structure is relatively complex, but this kind of structure can improve the torsional rigidity of blade and the blade trailing edge skin it strength.
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