Roof challenge

 OBJECTIVE

THE  main purose to design a roof rails like roof rail center roof rail with reinforcement rail bow rail2 ,2 rear roof rail an calculate heat distoction snow laod etc

INTRODUCTIN

here we going to study about how to createa roof with nx cad application

SUN ROOF

a sun roof is a movable window that automatically close the roof also air to enter persangef confortble

ROOF CRUSH TEST

Roof crush test design giving by iihs after analysis the many accident iihs hasfixed some regulation

FEATURE USED TO CREATE ROOF

REINFORCE MENT RAIL

FEATURE TO CREATE BEW ROOF 

FEATURE TO CREATE BEW ROOF

HEAT DISTORTION STUDY ON THE ROOF

THE teat distortion study plays a major role in sheet metalusages heat distortion temperature limit above which material cannot b used of the structure application

BOW - ROOF PREDICTION FORMULA

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

Judgement Condition: OK< 2.7> 3.1

where

L= roof length in x direction mm roofdimention in o-y

R= roof curvature

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

Rx= X curvature

RY= y curvature

t= roof thicknes

l= bow roof span

SNOW LOAD PREDICTION TEST

Snow Load Prediction Test:

Snow load Prediction formula:

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)

Judgement condition = Qr ≥ 3.1

        250 ≤ s ≤ 380

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 centre point between Roof rail Front /Rear as the reference point of the front and the rear.

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

Width of the roof panel exposed on the surface.

Y = Distance from 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.

 

 FRONT VIEW

TOP VIEW

 SIDEVIEW

 CONCLUSION

FINALLY the roof design has been completed sucessfully with the provided styling surface master sketch parameter