Roof challenge
Aim :
- For the given roof styling, develop the essential flanges and renforcements and provide appropriate dimentions and check for draft analysis and to perform roof curvature study using NX - CAD
- To calculate Heat Destortion criteria and Snow Load criteria for the ROOF.
- To submit ROOF Design along with Front Roof Rail, Real Roof Rail, BOW Roof 1, BOW Roof 2 and Center Roof Rail with it's Reinforcement. Need to submit every component as individual assembly.
INTRODUCTION:
- An automobile roof or car top is the portion of an automobile that sits above the passenger compartment, protecting the vehicle occupants from sun, wind rain and other external elements.Because the earliest automobileswere designed in an era of horse-drawn carriages, early automobiles roofs used similar materials and designs.
- The roof is a styling surface part which is fixed with the BIW body through the rails and panels inside the upper roof to provide it strength and stiffness.
Types of ROOFS :
A. Hard tops
B. T- Tops
C. Convertible roofs
D. Sunroofs
E. Targa tops
DESIGN CONSIDERATION OF THE ROOFS :
A. Head clearance
B. Draft analysis
C. Visibility criteria
D. Heat distortion and Snow load criteria
E. Safety Parameters
ROOF CRASH TEST (Roll over test):
- For initial condition doors will be closed at the time of crash test.
- Measurement has to be done by Load Displacement Graph.
- Recording of the deformation conditions using the measurement results.
- Recording of the deformation using photographs can be done.
Let's design ROOF using NX Cad !!!
1. Styling data or input from my styling team. Need to take as guide and proceed further to adress design of different assemblies of ROOF.
2. ASSEMBLIES TO DESIGN AS BELOW:
A. FRONT ROOF RAIL:
- Design Cosideration followed as below given data:
- NX CAD FRONT ROOF RAIL -
- SECTION VIEW FRONT ROOF RAIL -
B. BOW ROOF 1 :
- Design Cosideration followed as below given data:
- NX CAD BOW ROOF 1
- SECTION VIEW BOW 1 :
C. CENTER ROOF RAIL :
- Design Cosideration followed as below given data:
- NX CAD CENTER ROOF -
- SECTION VIEW CENTER ROOF RAIL WITH REINFORCEMENT :
D. CENTER ROOF RAIL REINFORCEMENTS:
- Design Cosideration followed as below given data:
- CENTER ROOF WITH REINFORCEMENT -
E. BOW ROOF 2 :
- Design Cosideration followed as below given data:
- NX CAD BOW ROOF 2 -
- SECTION VIEW BOW 2 :
F. REAR ROOF RAIL :
- Design Cosideration followed as below given data:
- NX CAD REAR ROOF RAIL -
- SECTION VIEW REAR ROOF RAIL :
G. DITCH AREA :
- Design Cosideration followed as below given data:
- NX CAD DITCH AREA -
3. HEAT DISTORTION CALCULATION :
- FORMULA TO BE USED FOR CALCULATION AS BELOW :
- DESIGN CONSIDERATIONS :
- RESULTS OF CALCULATIONS :
4. SNOW LOAD CALCULATIONS:
- FORMULA TO BE USED FOR CALCULATION AS BELOW :
- DESIGN CONSIDERATIONS :
- RESULTS OF CALCULATIONS :
5. MOMENT OF INERTIA for below mentioned assemblies :
A. BOW ROOF 1 :
B. CENTER ROOF RAIL WITH REINFORCEMENT :
C. BOW ROOF 2 :
6. DRAFT ANALYSIS for below mentioned assemblies :
A. FRONT ROOF RAIL :
B. BOW ROOF RAIL 1 :
C. CENTER ROOF RAIL :
D. BOW ROOF RAIL 2 :
E. REAR ROOF RAIL :
Conclusion:
- Using all the input data i have successfully designed BOW ROOF 1, BOW ROOF 2, FRONT ROOF RAIL, CENTER ROOF RAIL & IT'S REINFORCEMENT, REAR ROOF RAIL.
- As per the Heat Distortion Criteria calculation we can clearly say that all the Bow roof positions are OK.
- For the Snow load criteria we can see there is some improvements required to fullfill the criteria.
- All roof rails draft analysis found OK.