Roof Design

Roof :-
Roof of cars that sits above the passenger comportment, protecting the vehicle occupants from sun, wind, rain, and other external elements.

In this challenge we are going to design front roof rail, rear roof rail and 2 bow roof . we gone designe this components with the hel of given data by design team of skill-lync.

Types of Roof :-

1. Sunroof :-

Sunroof is type of roof which allow the part of roof to open and aloow thr air, sunlight to get inside the car. it is operate automatic or manually.

• panoramic sunroof :-

Panoramic sunroof is large in size it give more area to get light and air inside the car. ths kind of roof is trending in current market.

• Spoiler sunroof :-

This type of sunroof is small in size than panoramic sunroof . it have sliding mechanisam that helps to slide part of roof to backward in direction .

• pop-up sunroof :-

This is type of sunroof which is same as spoiler sunroof but it have pop-up mechanism and spoiler have sliding mechanism. Size of opening area of pop-up and spoiler sunroof is same. it allow air & sunlight to come inside the car.

2. Hardtop roof :-

This type of roof are normally use in car which are costly . it is kinde of convertible roof system

• Retraceble hardtop roof :-

Retaceble means it get reposition after click of button it automaticly get proper aligne in place .it is made up of plastics and metals.

• Retraceble soft-tops :-

Retraceble soft-tops are trending roof in convertible cars. it look neet and cool. majority of modern convertibles and roadsters are made from durable polyester/polyacrylic vinyl or canvas.

• Detachable hardtops:-

Detachable hardtops are used in old cars . It is manually oprated thing and we can also store our roof in cars boot .

• Roof :-

Roof is made up of many components.

1.Front roof-rail

2.front bow roof

3.central roof

4.rear bow-rail

5.rear roof-rail

I have design this roof according to specified dimention. dimention are given by design team.

To calculet bow roof location we need to use some basic formula as given below

W = [1.73 x 10^(-3) x L] + [1.85 x 10^(-8) x (R^2)/t] + [ 1.10x10^(-3) x l] - 2.68

Where,

L = Roof Length in X-Direction[mm](Roof dimension in 0-Y)

R = Roof curvature

R = 2(Rx*Ry)/(Rx+Ry)

Rx = X curvature

Ry = Y curvature

t = Roof plate thickness [mm]

l = Bow Roof Span [mm]

Judgment Condition

OK< 2.7

To calculate Snow Load Prediction :-

Qr = [Iy x t²] / [α x s x [(Rx + Ry)/2]² x 10^-8]

Note: The Qr value given over here is correct. There was a typo error in the formula given in the video.

Where,

α = My x Lx² x 10^-12 , My = Y(Ly-Y)

t = Roof plate thickness [mm]

Ly = Distance between the front and rear roof Rails on the Vehicle along with 0Y[mm]

Length of Roof panel with the center point between Roof rail Front /Rear as the front and rear reference point.

Lx = Distance between the Left and Right end of the roof on the Roof BOW [mm]

The width of the roof panel is exposed on the surface.

Y = Distance front Front Roof Rail to Roof BOW[mm]

s = Distance for which Roof BOW bears divided load [mm]

s = L1/2 + L2/2

Iy = Geometrical moment of inertia of Roof BOW (Y cross-section )[mm4]

Rx = Lateral direction curvature radius of roof panel Y cross-section on Roof BOW [mm]

Roof panel curvature Radius of the Length Lx in Front view

Ry = Longitudinal Direction curvature radius of the Roof panel X cross-section on Roof BOW [mm]

Roof panel X curvature radius of length s in Side view

Judgment condition

Qr ≥ 3.1

250 ≤ s ≤ 380

conclusion :

we have design roof that complets all kind of equation.