Roof Design

REPORT:

AN AUTOMOBILE ROOF OR CAR TOP IS THE PORTION OF AN AUTOMOBILE THAT SITS ABOVE THE PASSANGERS COMPARTMENT,PROTECTING THE VEHICLE OCCUPANTS FROM SUN,WING,RAIN,AND OTHER EXTERNAL ELEMENTS.THE COMPONENT OF AN AUTOMOBILE THAT LIES ABOVE THE PASSENGERS COMPARTMENT .MOST HEADLINE CONSIST OF A TRICOT KNIT FABIR THAT IS NAPPED TO PROVIDE APPEREANCE.THE FABRIC IS ADHERTED TO MELTED PLYURETHENE FOAM.THE FABIRIC -FORM COMPOSITES IS GLUED TO THE INTERIOR FIBERGLASS OF THE AUTOMOBILE.METAL ROOFG PANNELS ARE MEASURED BY GUAGE AND ARE USUALLY BETWEEN 22 AND 29.CORRUGATED METAL ROOFING IS THE LEAST EXPENSIVE TYPEW OF MEATAL ROOFING..THE ROOF CAN BE A HARD OR SOFT TOP.OPEN-TOP CARS ARE CALLED CABRIOLETS OR DROP-TOP CARS.SOME COMPANIES CALL THEM CONVERTIBLE WHILE SOME MANUFACTURED PREFER TO CALL THEM CABRIOLETS,BUT THE BASIC FUNCTIONING REAMINS THE SAME

THERE ARE THREE MAIN TYPES OF ROOF RAILS ARE THERE:
1)BOW ROOF RAILS

2)REAR ROOF RAIL

3)FRONT ROOF RAIL

ROOF:

• FIRST WE WANT TO GET THE STYLYED SURFACE FROM THE STYLED TEAM .AFTER GETTING T5HE SURFACE WE WANT TO START STYLE THE SURAFCE
• WE WANT TO MAKE THE SURFACE FIRST WE WANT TO EXTRACTED THE SURAFCE BECAUSE WE DON'T START CREATE THE SURFACE I9N STYLED SURFACE GIVEN
• AFTER EXTARACTED SURAFCE WE WANT TO UNITRIM THE SURAFCE BECAUSE THERE WAS SOME HOLE IN THE SURAFCE SO WE UNITRIM THE SURFACE TO GET PROPER SURAFCE
• AFTER UNITRIM THE SURFACE WE WANT TO CHECK THE SURAFCE IF THERE IS ANY UNWANTED SURFACE IS CREATED .THERE WAS SOME EXTRA SURAFCE ARE CREATED WE WAN TO MAKE TRIM SHEET TO TRIM THE SURFACE .

1)FRONT ROOF RAIL:

• THE FRONT ROOF RAILS ARE MAKE TO FIX THE ROOF RAIL IN FIXED POSITION IN CAR
• FIRST WE WAN TO MSAKE THE SURFACVE WE WANT TO OFFSET THE SURFACE TO GET OF 0.75*2+.2mm.IT IS A NOMINAL THICKNESS OF THE SURFACE AND TOLERENCE OF THE SURFACE
• AFTER THAT WE WANT MAKE TRIM THE SHEET THE SURACE TO GET THE FIRST SURFACE
• THEN WE WAN TO MAKE THE OFFSET OF THE SURFACE OF 0.75*2+3mm TO GET THE NEXT SURFACE WE WANT TO MAKE BY USING THE TRIM SHEET OF THE SURFACE.FOR THAT FIRSDT WE WANT TO MAKE THJE OFFSET OF CURVE OF 5 mm
• AFTER THE SURFACE THEN USE THE TRIM SHEET OPTION TO TRIM THE SURFACE.AFTER GETTING THE SURFACE OFFSET THE SURFACE OF 0.75*2+5mm TO DOWARD DIRECTION TO GETH THE NEXT SURFACE
• THE MAKE YHE DATUM PLANE TO MAKE THE CORRECT OFFSET CURVE ON SURFACE.BECAUSE THE SURFACE IS SLIGHTLY TILTED SURFACE.
• WE WANT TO MAKE IT LIKE THATMAKE DATUM PLANE USE INTRECTION LINES TO TO GET LINE AFTER THAT USE THE OFFSET CURVE SURFACE REMEBER TO CHANE THE OPTION AS THROUGH THE POINT TO GET THE STRAIGHT LINE
• AFTER THAT USE LAW EXTENSION AND STUDIO SURAFCE TO GETTING TIGHTLED SURFACE
• IF THRE IS ANY MENTION IT IS BETTER TO USE LAW EXTENSION INSTEAD OF USING STUDIO SURAFCE

2)REAR ROOF RAIL:

• AFTER CREATED THE FRONT ROOF RAIL.NEXT WE WANT TO MAKE THE REAR ROOF RAIL SURFACE
• FIRST WE WANT TO MAKE THE MAKE THE SURFACE FOR THAT WE WANT TO OFFSET THE SURFACE OF 0.75*2+3mm of and the make the offset of curve sURFACE OF 5MM
• THEN USE THE TRIM SHET OPTION TO TRIM THE SURFACE.AFTER GETTING THE SURFACE WE WANT TO MAKE THE NEXT SURFACE .FIRST WER WANT TO OFFSET THE SURFACE OF0.75+0.75+5mm
• AFTER OFFSET THE SURFACE WE WANT MAKE THE OFFSET OF CURVE SURFACE OF 10mm AND USE TRIM SHET OPTION TO TRIM THE SURFACE.
• AFTER MAKING THE SECOND SURFACE WE WANT TO MAKE THE 3rd SURFACE FOR SAME METHOD USED IN FRONT RAIL WE WANT TO USE THE SURFACE TO GET CORRECT SURFACE
• AFTER THAT USE LAW EXTENTION TO JOIN THE SURAFCE OF 32 DEG AND ANOTHER ONER SURFACE WE WANT TO CREATE FIRET WE WANT TO MAKE THE SURFACE FROM END OF REAR USE LAW EXTENTION OPTION TO EXTEND IT OF 35.7mm OF 25-30 DEG WE WAN USE IN BETWEEN THEM
• AHTER THAT MAKE THE SURFACE OF 0 DEG ANGLE WITH THE LENGHT OF 35.7mm AND AMKE ANOTHER ONE LAW EXTENSION OPTION TO EXTEND THE SURAFCE WITH ANGLE 90 DEG TO GET THE HORIZONTAL LINE OF LENTHG OF 45mm

3)BOW RAER RAILS:

• AFTER FINISHING THE REAR ROOF RAIL.WE WANT TO MAKE THE BOW RAIL FIRST WE WANT TO MAKE THE OFFSET OF THE SURFACE OF 0.75+0.75+.2 mm OF THE SURFACE THEN OFFSET THE CURVE SURFACE TO 5mm oF THE SURFACE
• AFTER THAT MAKING THE SURFACE WE WANT TO MAKE THE ANOTHER TWO SURAFCE TO GET THE REQUIRED SURFACE THAN OFFSET THE ONE SURFACE OF 0.75+0.75+3mm AND ANOTHER SUREFACE OF 0.75+0.75+5
• AFTER MAKING THE THE 3 OFFSET SURFACE WE WANT TO USE THE TRIM AND EXTEND OPTION TO MAKE THE CORRECT SURFACE
• BECAUSE IN TRIM SHET AND USE LAW EX TENTION OPTION WE DONT ABLE TO GIVE THE DRAFT TO THE SURFACE.
• IN ORDER TO FORGOT TO GIVE THE DRAFT THE COMPONENT IS ABLE TO FAIL IN THE SURFACE SO WE USE TH TRIM EXTEND OPTION OF 7 DEG DRAFT THE SURFACE

DRAFT ANALYSIS:

FULL VIEW OF ROOF:

BOW ROOF CALCULATION:

W=[1.73*10^(-3)]*[1.85*10^(-8)]*(R*2)/t]+[1.10*10^(-3)*I]-2.68

JUDEGEMENT CONDITION:OK<2.7

S.NO	BOW ROOF	RX	RY	R	t	I	L	R^2/t	W	OK/NG
1	1-FRONT ROOF	5380	3445	4412.5	0.75	780	2056	5384889490.39	2.4	OK
2	BOW ROOF	4763	4966	4864.5	0.75	820	2400	6988629460	2.6	OK
3	REAR ROOF	1174	5446	3310	0.75	806	2305	2500004229	2.1	OK

JUDGEMENT : OK<2.7