ROOF CHALLENGE
Construction:
Roof is connected to A-pillar, B-Pillar and C-Pillar to cover the Front and rear door. Roof is supported by reinforcement bow-roof with front and back roof rail.
The total length of the roof is 2033mm and the width is 1192.7918mm(Max) and 1047.5968mm(Min). A standard hatchback car comes with length of 1400 long x 900 wide. The given roof is nearer to a Sedan or a SUV car and not a hatchback. In a hatchback car I only noticed a reinforcement roof. In this design one reinforcement with three bow roofs is sufficient and could be positioned. 1923.1107 /5 = 384mm. So, Within the gaps of 380-384, bow roofs could be installed. Though one bow roof width is less so same is also placed near with 70mm.
Front Roof Rail:
The roof rail supports the Wind shield glass (3.7- 4.7 thick) and a rubber is pasted below that (4-5mm) sticked with a sealant. 21.5mm length is measured featured design purposefully (8+5+7+2). 3 degree angle is also designed for a reason. Visibility criteria will deteriorate the wind shield glass. Visibility criteria is used for the driver. Head room clearance is also need to maintained. Min 80mm is followed.
Rear Roof Rail:
Reinforcement Roof:
Bow Roofs:
Complete Bow Views:
ROOF CURVATURE STUDY:
The roof curvature study is given below in which value of W is below 2.77 which satisfy our design consideration.
|
S. No |
BOW\'s |
Rx |
Ry |
R |
I |
L |
t |
(R^2)/t |
W |
OK/ NG |
|
1 |
FR & 1st |
5818.332 |
2145.05873 |
3134.544 |
351.8mm |
2033 |
0.65 |
15115947.8 |
1.51 |
OK |
|
2 |
1st & CTR |
5203.332 |
5564.20747 |
5379.3281 |
323.55mm |
2033 |
0.65 |
68490345.1 |
2.42 |
OK |
|
3 |
CTR & 2nd |
3925.7246 |
10477.5401 |
5755.13742 |
277mm |
2033 |
0.65 |
50956318 |
2.06 |
OK |
|
4 |
2nd & RR |
3247.6669 |
14550.82 |
2655.06932 |
378mm |
2033 |
0.65 |
10845220.1 |
1.62 |
OK |
Section Modulus Results:
Section modulus result is given below.
Front:
Back:
Bow Roof 1:
Bow Roof 2:
Reinforcement Roof: