Roof Design
Aim: To model a car roof with appropriate design consideration
Software used : NX CAD
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 automobiles were designed in an era of horse drawn carriages, early automobile roofs used similar materials and designs
Theory:
A car roof although looks simple from outside is quite a tricky component to model. Different components which comprises the inner panel of the car roof are , Fromt roof rail. Rear roof rail. Center roof rail and reinforcements and Bow roof rail. Number of bow roof rails are decided by the designed provided with the design and performance constrains.
Design:
Isometric view of the roof assembly
Bottom view of the Roof assembly
Front roof rail
Bow-1 Roof rail
Center roof rail (Extra area facilitated for the inclusion of the mastic points in order to improve the strength of the part)
Bow-2 roof rail
Rear roof rail
From the above Table it cam be concluded that this design would clear the heat distortion criterion since all values of W are less than 2.5
Snow Load Criterion:
Since all values of Qr is greater than 2.5, this design clears the snow load criterion
Section inertia analysis:
Front Roof rail section
Bow 1 section
Center reinforcement section
Bow 2 section
Rear roof rail section
Master section