Proje Mc Brien
of 28
Transcript of Proje Mc Brien
-
8/21/2019 Proje Mc Brien
1/28
MIT | Martin McBrien | Nii Armar | Anas Alfaris
16.810Vehicle Design Summit Team 1
Ingress/Egress
-
8/21/2019 Proje Mc Brien
2/28
FabricationAnalysis and OptimizationDesign System
-
8/21/2019 Proje Mc Brien
3/28
FabricationAnalysis and OptimizationDesign System
Design System
Objective :
Multi-Objective problem
Quantifiable Criteria
Cost ($)
Visibility (sq. m)
Egress Ingress (sec)
Unquantifiable CriteriaEase of Manufacturability
Aesthetics
-
8/21/2019 Proje Mc Brien
4/28
FabricationAnalysis and OptimizationDesign System
Design System
Design Variables:
Geometry (Number and positions of Joints)
Material (Transparency/Opaque)
Kinematics (Hinge, Slider..etc)
Constrains:
Shape of existing Shell (m)
Weight (Kg)Cost ($)
-
8/21/2019 Proje Mc Brien
5/28
FabricationAnalysis and OptimizationDesign System
Design System
Concept
-
8/21/2019 Proje Mc Brien
6/28
FabricationAnalysis and OptimizationDesign System
Design System
Design Solut ion Tree:
-
8/21/2019 Proje Mc Brien
7/28
FabricationAnalysis and OptimizationDesign System
Design System
-
8/21/2019 Proje Mc Brien
8/28
FabricationAnalysis and OptimizationDesign System
Design System
-
8/21/2019 Proje Mc Brien
9/28
FabricationAnalysis and OptimizationDesign System
Design System
-
8/21/2019 Proje Mc Brien
10/28
FabricationAnalysis and OptimizationDesign System
Design System
-
8/21/2019 Proje Mc Brien
11/28
FabricationAnalysis and OptimizationDesign System
Design System
-
8/21/2019 Proje Mc Brien
12/28
FabricationAnalysis and OptimizationDesign System
Design System
-
8/21/2019 Proje Mc Brien
13/28
FabricationAnalysis and OptimizationDesign System
Design System
-
8/21/2019 Proje Mc Brien
14/28
FabricationAnalysis and OptimizationDesign System
Analysis and Optimization
Test 1 Hard Opening Highest dynamic load when someone opens canopy and pins hit end of rails Force of 2g * mass of canopy ~ 11 pounds Restraints of fixed edges roughly equivalent to final design Stress concentrated around joint
Displacements acceptable
-
8/21/2019 Proje Mc Brien
15/28
FabricationAnalysis and OptimizationDesign System
Analysis and Optimization
Test 2 Driving Pressure Force Pressure on canopy while driving 60mph ~550N/m2 Restraints of fixed edges based on magnetic strips Natural modes at low freq first mode at 0.5Hz Canopy displacement ~3mm max at 60mph
-
8/21/2019 Proje Mc Brien
16/28
FabricationAnalysis and OptimizationDesign System
Analysis and Optimization
Test 3 Rail Optimization Varied thickness of rail to find optimum size to avoid yield at min mass Force of 40N side load someone leaning on canopy
Thickness FoS
(inches)1 8.90.5 2.70.25 2.0
We tried to use a thicker sandwich material delaminated Now using 0.25 inch aluminium, slightly different rail design
-
8/21/2019 Proje Mc Brien
17/28
FabricationAnalysis and OptimizationDesign System
Analysis and Optimization
-
8/21/2019 Proje Mc Brien
18/28
FabricationAnalysis and OptimizationDesign System
Analysis and Optimization
-
8/21/2019 Proje Mc Brien
19/28
FabricationAnalysis and OptimizationDesign System
Fabrication
Canopy Ordered from professional manufacturer in FloridaHandles Aluminium tube welded onto waterjetted guide railsRails Aluminium, waterjet, attached by U-ClampAttachment Adhesive backed magnetic strip
-
8/21/2019 Proje Mc Brien
20/28
FabricationAnalysis and OptimizationDesign System
Fabrication
-
8/21/2019 Proje Mc Brien
21/28
FabricationAnalysis and OptimizationDesign System
Fabrication
-
8/21/2019 Proje Mc Brien
22/28
FabricationAnalysis and OptimizationDesign System
Fabrication
-
8/21/2019 Proje Mc Brien
23/28
FabricationAnalysis and OptimizationDesign System
Fabrication
-
8/21/2019 Proje Mc Brien
24/28
FabricationAnalysis and OptimizationDesign System
Fabrication
-
8/21/2019 Proje Mc Brien
25/28
FabricationAnalysis and OptimizationDesign System
Fabrication
-
8/21/2019 Proje Mc Brien
26/28
FabricationAnalysis and OptimizationDesign System
Fabrication
Whats Next?
Handles welded to rails
Attach rail to chassis
Sand shell and canopy
Reinforcing canopy
Attaching canopy to reinforcement
Attaching reinforced canopy to handles
Test mechanism, fix problems!
Stick on magnetic strips so canopy stays shut
Drive AHPV to Solidworks World
Sleep
-
8/21/2019 Proje Mc Brien
27/28
FabricationAnalysis and OptimizationDesign System
Cost Estimation
-
8/21/2019 Proje Mc Brien
28/28
FabricationAnalysis and OptimizationDesign System
Lessons Learned
Set realistic goals Better use of FEA for optimization our rail could have been designedto be lighter Start manufacturing early, maybe finish on time Have the right tools
Make the right decisions at the right time
To be continued
