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AE 440 Structures Discipline Lecture 6. Eric Loth For AE 440 A/C Lecture. Structures Responsibilities. Determine V-n relationships and establish a V-n diagram Establish and maintain load paths

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ae 440 structures discipline lecture 6

AE 440Structures Discipline Lecture 6

Eric Loth

For AE 440 A/C Lecture

structures responsibilities
Structures Responsibilities
  • Determine V-n relationships and establish a V-n diagram
  • Establish and maintain load paths
  • Determine component materials (weights and dimensions to configuration) and consider environmental impact of acquisition, production and operations
  • Determine landing gear configuration
  • Carry out a detailed structural design of the wing box and wing attachment and structurally design landing gear (weights & dimensions to configuration)
  • Employ FEM Analysis
v n diagram
V-n Diagram

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/MainFrame?OpenFrameSet

load paths
Load Paths
  • How loads are transferred from one structural member to another
  • Wing skin—torsion and shear stress
  • Wing ribs—maintain shape and rigidity, transfer loads from skin to spars
  • Wing spars—bending moments
  • Fuselage—bulkheads, framers, stringers
major fuselage loads
Major Fuselage Loads
  • Empennage loads due to trim, maneuvering, turbulence and gusts
  • Pressure loads due to cabin pressurization
  • Landing gear loads due to landing impact, taxiing and ground maneuvering
  • Loads induced by the propulsion installation when the latter is attached to the fuselage
structural components
Structural Components
  • Spars
  • Ribs
  • Skin
  • Beam shear
  • Beam bending
  • Torsion

Cessna Citation II

materials
Materials
  • Selection criteria
    • Strength
    • Stiffness
    • Density
    • Cost
  • Typical materials
    • Aluminum
    • Composites
    • Steel
    • Titanium
  • Mini-UAV materials
    • Plastic
    • Balsa
    • Fiber (cloth)
landing gear loads
Landing Gear Loads
  • Vertical loads primarily caused by non-zero touchdown rates and taxiing over rough surfaces
  • Longitudinal loads primarily caused by braking loads and rolling friction loads
  • Lateral loads primarily caused by ‘crabbed landings,’ cross-wind taxiing and ground turning
structural configuration 441 level
Structural Configuration (441 level)

I-beam gives good resistance to shear (web) and bending (caps)