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

Download Redesign of the STOL CH 701 Landing Gear Strut Group Members: Peter Chiu Cameron Clark Dave Maharaj Okason Morrison

Post on 02-Jan-2016

224 views

Category:

Documents

5 download

Embed Size (px)

TRANSCRIPT

  • 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

    1109.41952085212

    1024.0795577077212

    950.9310178714212

    887.53561668212

    832.0646406375212

    783.1196617765212

    739.6130139212

    700.6860131684212

    665.65171251212

    633.9540119143212

    605.1379204636212

    578.8275760956212

    554.709760425212

    532.521370008212

    512.0397788538212

    493.0753426212

    475.4655089357212

    459.0701465586212

    443.76780834212

    429.4527177484212

    416.0323203187212

    403.4252803091212

    391.5598308882212

    380.3724071486212

    369.80650695212

    359.8117364919212

    350.3430065842212

    341.3598525692212

    332.825856255212

    324.7081524439212

    316.9770059571212

    309.6054476791212

    302.5689602318212

    295.84520556212

    289.4137880478212

    283.2560478766212

    277.3548802125212

    271.6945765347212

    266.260685004212

    261.0398872588212

    256.0198894269212

    251.1893254755212

    246.5376713212

    242.0551681854212

    237.7327544679212

    233.5620043895212

    229.5350732793212

    225.6446483085212

    221.88390417212

    218.246463118212

    214.7263588742212

    211.3180039714212

    208.0161601594212

    204.8159115415212

    201.7126401545212

    198.7020037343212

    195.7799154441212

    192.9425253652212

    190.1862035743212

    187.5075246507212

    184.903253475212

    182.3703321945212

    179.9058682459212

    177.507123336212

    175.1715032921212

    172.8965487039212

    170.6799262846212

    168.5194208886212

    166.4129281275212

    164.3584475333212

    162.3540762219212

    160.3980030145212

    158.4885029786212

    156.6239323553212

    154.8027238395212

    153.0233821862212

    151.2844801159212

    149.5846544966212

    147.92260278212

    146.2970796725212

    144.7068940239212

    143.1509059161212

    141.6280239383212

    140.1372026337212

    138.6774401062212

    137.2477757753212

    135.8472882673212

    134.4750934364212

    133.130342502212

    131.812220299212

    130.5199436294212

    129.2527597107212

    128.0099447135212

    126.7908023829212

    125.5946627377212

    124.420880843212

    123.26883565212

    122.1379289009212

    121.0275840927212

    119.9372454973212

    118.8663772339212

    117.8144623911212

    116.7810021947212

    115.7655152191212

    114.7675366397212

    113.7866175231212

    112.8223241542212

    111.8742373966212

    110.941952085212

    110.0250764479212

    109.123231559212

    108.2360508146212

    107.3631794371212

    106.5042740016212

    105.6590019857212

    104.8270413402212

    104.0080800797212

    103.201815893212

    102.4079557708212

    101.6262156504212

    100.8563200773212

    100.0980018812212

    99.3510018672212

    98.61506852212

    97.8899577221212

    97.1754324832212

    96.4712626826212

    95.7772248216212

    95.0931017871212

    94.4186826255212

    93.7537623253212

    93.0981416098212

    92.4516267375212

    91.8140293117212

    91.1851660973212

    90.5648588449212

    89.952934123212

    89.3492231557212

    88.753561668212

    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

    359.811736491921237

    350.343006584221238

    341.359852569221239

    332.82585625521240

    324.708152443921241

    316.977005957121242

    309.605447679121243

    302.568960231821244

    295.8452055621245

    289.413788047821246

    283.256047876621247

    277.354880212521248

    271.694576534721249

    266.26068500421250

    261.039887258821251

    256.019889426921252

    251.189325475521253

    246.537671321254

    242.055168185421255

    237.732754467921256

    233.562004389521257

    229.535073279321258

    225.644648308521259

    221.8839041721260

    218.24646311821261

    214.726358874221262

    211.318003971421263

    208.016160159421264

    204.815911541521265

    201.712640154521266

    198.702003734321267

    195.779915444121268

    192.942525365221269

    190.186203574321270

    187.507524650721271

    184.90325347521272

    182.370332194521273

    179.905868245921274

    177.50712333621275

    175.171503292121276

    172.896548703921277

    170.679926284621278

    168.519420888621279

    166.412928127521280

    164.358447533321281

    162.354076221921282

    160.398003014521283

    158.488502978621284

    156.623932355321285

    154.802723839521286

    153.023382186221287

    151.284480115921288

    149.584654496621289

    147.9226027821290

    146.297079672521291

    144.706894023921292

    143.150905916121293

    141.628023938321294

    140.137202633721295

    138.677440106221296

    137.247775775321297

    135.847288267321298

    134.475093436421299

    133.130342502212100

    131.812220299212101

    130.5199436294212102

    129.2527597107212103

    128.0099447135212104

    126.7908023829212105

    125.5946627377212106

    124.420880843212107

    123.26883565212108

    122.1379289009212109

    121.0275840927212110

    119.9372454973212111

    118.8663772339212112

    117.8144623911212113

    116.7810021947212114

    115.7655152191212115

    114.7675366397212116

    113.7866175231212117

    112.8223241542212118

    111.8742373966212119

    110.941952085212120

    110.0250764479212121

    109.123231559212122

    108.2360508146212123

    107.3631794371212124

    106.5042740016212125

    105.6590019857212126

    104.8270413402212127

    104.0080800797212128

    103.201815893212129

    102.4079557708212130

    101.6262156504212131

    100.8563200773212132

    100.0980018812212133

    99.3510018672212134

    98.61506852212135

    97.8899577221212136

    97.1754324832212137

    96.4712626826212138

    95.7772248216212139

    95.0931017871212140

    94.4186826255212141

    93.7537623253212142

    93.0981416098212143

    92.4516267375212144

    91.8140293117212145

    91.1851660973212146

    90.5648588449212147

    89.952934123212148

    89.3492231557212149

    88.753561668212150

    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