Masters Report
-
Upload
prathamesh-deshpande -
Category
Documents
-
view
10 -
download
1
Transcript of Masters Report
![Page 1: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/1.jpg)
STRUCTURAL ANALYSIS OF INTEGRATION OF A
NON-CYLINDRICAL CNG TANK
BY PRATHAMESH P. DESHPANDE
ADVISORDR. GREGORY M. ODEGARD
![Page 2: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/2.jpg)
TOPICS
• Introduction• Objective• Design modifications• Finite Element Analysis (FEA)• Results• Conclusion• Future work
![Page 3: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/3.jpg)
INTRODUCTION
• Use of CNG as an alternate automobile fuel• Development of non-cylindrical CNG fuel tank• Integration of the tank in the underbody• Availability of entire cargo space
[Untitled illustration of CNG powered pickup truck]. Retrieved June 22, 2015 from http://www.gmfleet.com/vehicle-overviews/fuel-efficiency/bi-fuel.html
![Page 4: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/4.jpg)
OBJECTIVE
• Integrating heavier tanks on the frame possible
• Modifying the CAD of the vehicle underbody
• Performing FEA to validate integration of 7 rectangular tanks on the frame
Odegard, G. M. (2015). Seven quarter scale tanks positioned under truck. Retrieved June 22, 2015 from Updates on Conformable Tank Development PowerPoint presentation
![Page 5: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/5.jpg)
CAD MODIFICATIONS
• List of modifications• Initial design • Final design
![Page 6: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/6.jpg)
LIST OF MODIFICATIONS
• Removal of default gas tank• Redesign and relocation of
exhaust• Removal of spare tire• Inclusion of secondary small gas
tank
![Page 7: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/7.jpg)
INITIAL DESIGN
![Page 8: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/8.jpg)
FINAL DESIGN
![Page 9: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/9.jpg)
FINITE ELEMENT ANALYSIS
• Original Chassis ConfigurationoStructureoMesh validationoMesh parametersoMesh patternoMaterialoLoad estimationoForces and constraintsoResults
![Page 10: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/10.jpg)
STRUCTUREC-channel Side railsCross-membersMounting brackets
![Page 11: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/11.jpg)
MESH VALIDATION
0 0.2 0.4 0.6 0.8 1 1.20
1
2
3
4
5
6
7
8
9
10
[X VALUE], [Y VALUE]
[X VALUE], [Y VALUE]
von Mises stress (ksi) vs Element size (inches)
Element Size (inches)
von
Mise
s str
ess (
ksi)
![Page 12: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/12.jpg)
MESH PARAMETERS
• Mesh type - 2D mixed mesh• Element size – 0.1 inch• Aspect ratio (< 5) – 4.93• Skewness (< 45 deg) – 40• Jacobian (> 0.6) – 0.6• Connectors – 1D seam
![Page 13: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/13.jpg)
MESH PATTERN
![Page 14: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/14.jpg)
MATERIAL
Sr. No. Property English Metric
1 Yield Strength 55 ksi 380 MPa
2 Tensile Strength 95 ksi 650 MPa
3 Elastic Modulus 29900 ksi 206 GPa
4 Poisson’s Ratio 0.29 0.29
5 Density 0.28 lbs./in3 7.75 g/cc
GM 980X- High strength steel
Rashid, M. (1977). GM 980X - Potential Applications and Review. SAE Technical Paper 770211, 1977, doi: 10.4271/770211.
![Page 15: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/15.jpg)
LOAD ESTIMATION
• Total load on the frame = 7120 lbs.• Load on front section = 4200.8 lbs. (233.38 lbs. on each location)• Load on rear section = 2919.2 lbs. (364.9 lbs. on each location)
Front section (passenger car)Rear section (cargo)
![Page 16: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/16.jpg)
FORCES AND CONSTRAINTS
F = 233.38 lbs.R = 364.9 lbs.
![Page 17: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/17.jpg)
RESULTSMaximum displacement = 0.027 inches
Maximum von Mises stress = 47.55 ksi
![Page 18: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/18.jpg)
FINITE ELEMENT ANALYSIS
• Modified Chassis ConfigurationoStructureoMaterialoUpdated loadsoResults
![Page 19: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/19.jpg)
STRUCTUREC-channel Side railsCross-membersMounting bracketsSide tank bracketsBack tank bracket
![Page 20: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/20.jpg)
MATERIAL
Sr. No. Property English Metric
1 Yield Strength 36.3 ksi 250 MPa
2 Tensile Strength 58 ksi – 79.8 ksi 400 MPa – 550 MPa
3 Elastic Modulus 29000 ksi 200 GPa
4 Poisson’s Ratio 0.26 0.26
5 Density 0.284 lbs./in3 7.85 g/cc
GM 980X for frame and A36 mild steel for brackets
Matweb, LLC. (2015). ASTM A36 Steel, plate. Retrieved June 22, 2015, from http://www.matweb.com/search/datasheet.aspx?matguid=d1844977c5c8440cb9a3a967f8909c3a
![Page 21: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/21.jpg)
UPDATED LOADS
• Load due to tank integration = 700 lbs. • Removal of weight from original load case = 215 lbs.
![Page 22: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/22.jpg)
RESULTSMaximum displacement = 0.11 inches
Maximum von Mises stress = 51.6 ksi
![Page 23: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/23.jpg)
RESULTS SUMMARY
Sr.
No.
Frame
Configuration
Component Material Maximum
Displacement
(inch)
Maximum von
Mises stress (ksi)
Yield
strength (ksi)
Factor of
safety
1 Original Frame GM 980X 0.027 47.55 55 1.16
2 Modified
Frame GM 980 X 0.031 45.94 55 1.2
Side brackets A36 mild steel 0.069 10.063 36.3 3.61
Back bracket A36 mild steel 0.11 51.604 36.3 0.70
![Page 24: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/24.jpg)
CONCLUSION
• Integration of the tanks is possible• Correct approach of mounting the
front 4 tanks• Failure of back bracket cannot be
established• Essential to include trailer hitch
assembly in future simulations
![Page 25: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/25.jpg)
FUTURE WORK
• Finalize design of brackets• Perform impact analysis on brackets and tanks• Conceptualize brackets for phase II tanks
![Page 26: Masters Report](https://reader035.fdocuments.in/reader035/viewer/2022062822/587a51bb1a28ab520b8b488d/html5/thumbnails/26.jpg)
THANK YOU