# redesign of the stol ch 701 landing gear strut group members: peter chiu cameron clark dave maharaj...

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• Redesign of the STOL CH 701 Landing Gear Strut Group Members: Peter ChiuCameron ClarkDave MaharajOkason Morrison

• Problem Definition

Design a single-piece double cantilever leaf spring capable of surviving the landing conditions set forth by the FAR.

• Specifications

• Theoretical Analysis 1: Newtons Equation of Motion

• AssumptionsPlane can be treated as point massConstant deceleration (vertical component only)Neglecting material propertiesPlane has zero final velocity

• CalculationsThe displacement, s is a function of 2 variables: u & a

sstrut = f (u, a) surface plot sstrutstire

• Maximum Displacement: 3-dS is max at a =1.67gu= 10 ft/sSstrut(max) = 212 mm (8.36 in)

• Theoretical Analysis 2: Beam Deflection

• Geometry SimplificationStrut can be modeled as a cantilever beamOnly a portion of strut needs to be analyze due to symmetry Beam subjected to 1 load and 1 moment

R = 1350 lbsRyYXM

• Deflection Equations

• Deflection Equations 2bh

• Beam AnalysisSuitable strut width 65 mm (2.6 in) Width

Chart1

1331.30342502212

1210.2758409272212

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1024.0795577077212

950.9310178714212

887.53561668212

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783.1196617765212

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633.9540119143212

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Beam Analysis

Newton's Law

Width (mm)

Deflection (mm)

Strut Width vs Deflection: Beam Analysis

y

Deflection (mm)Max Strut (mm)strut width

1331.3034250221210

1210.275840927221211

1109.4195208521212

1024.079557707721213

950.931017871421214

887.5356166821215

832.064640637521216

783.119661776521217

739.613013921218

700.686013168421219

665.6517125121220

633.954011914321221

605.137920463621222

578.827576095621223

554.70976042521224

532.52137000821225

512.039778853821226

493.075342621227

475.465508935721228

459.070146558621229

443.7678083421230

429.452717748421231

416.032320318721232

403.425280309121233

391.559830888221234

380.372407148621235

369.8065069521236

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y

Beam Analysis

Newton's Law

Width (mm)

Deflection (mm)

Strut Width vs Deflection: Beam Analysis

• Finite Element Analysis

• ModelingMaterial: Al 2014yield: 414 MPa

• Optimization Study

• Engineering Drawings of Final Design

• Deflection Video

• DeflectionSstrut(max) = 45 mm (1.77 in)

• Von Mises Stressvm: 307 MPa S.F. = 1.3

• Summary Table

• Questions

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