Roof Design

Aim:- For the Given Roof styling, create an ASSEMBLY by developing the essential flanges for the outer roof and creating the reinforcements.

Objective:-

1. To do appropriate dimensions and check for Draft analysis.
2. To do a curvature study on the roof and perform calculations to determine the position of the Bow-roofs.
3. To do the Draft Analysis.

1. Introduction:

Roof is the major span part of the vehicle which protects the passenger from the sunlight, rain and from any external material.

The main parts of the roof panel are Front Roof Rail, Rear Roof Rail, Centre Roof Rail, and Bow Roof. Bow roof can be 2,3 or more as per the car size.

Design consideration of Roof:-

• Head clearance

• Heat distortion

• Snow load criteria

• Draft Analysis

Design image:-

Roof Outer Panel:-

Master section of the Rear Roof Rail

Design:-

Master section of Bow Roof:-

Design:-

Bow roof 1:-

Bow Roof 2:-

Master section of Center Reinforcement Rail:-

Design:-

DRAFT ANALYSIS:-

• Outer Panel:-

Front Roof Rail:-

Bow Roof Rail 1:-

• Bow Roof Rail 2:-

Center Bow Roof Rail:-

Rear Roof Rail:-

Heat Distortion Calculation:-

Roof gets shrinks and expands due to temperature difference, to avoid this kind of problem the Bow–Roof Prediction is used which is having a Formula given below:-

Calculation Information:-

From the above table, it can be concluded that all values of W< 2.7 and also not W>3.1 so thus infer that the current positioning of the Bow roof is good in the state as per the design and found OK.

Snow Load Calculation:-

Judgment condition

Qr ≥ 3.1

250 ≤ s ≤ 380

Calculation Information:-

Conclusion:-

From the above table we can conclude that two portion are fit for the snow load but the first one portion is not able to take snow load , in that case we can do emboss the roof outer panel to give strength and can change the grade.