Fender Design - Wheel Arch Challenge

Fender Design- Wheel arch challenge 

Aim- calculate the wheel arch at requied points and check whether car passes the european standard.

Theory:-

Fender and Fender Wheel Arch Regulation:- Fender basically is a part of an automobile, motorcycle, or other vehicle or any transportation body that attetched onto wheel well. Its primary purpose is to prevent sand, mud, rock, liquid, and, other road spray from being into air by the rotating tire. Fender are typically rigid and can be damaged by contact with the road surface.

the main purpose of fender on cars is that they sheild the wheels and they proctect the passengers, the pedestrians, and other vehicles components from the stone ,mud, and other debris that can fly in the air becouse of the speeding ratating tire while the car in motion.

Wheel Arch is having some standard specification. If we see car from the front, if the wheel is outside the fender of the car, it does the more chiping and these will damage a lot to the pedestrian and also to the car.

An image below shows a car having their tire outside the fender

Now a day for avoiding design alterations of the same vehicle to get the deffernert regulations parameters are taken into consideration for design purpose.

Japan Regulaition :-

 

• Asper the japanese regulation, The clearance L for tire, hub cap and fender is to be measured within area K and create clearance check chart to validate. 
• the value of L should be greater then 5mm at all points.
• wheel guard requirement:- the value of A should be more then 5mm at line 30* aniclockwise and 50* clockwise from the central vertical axis of the wheel.

Eropean Regulations:- 

• the clearance L  should be measured at defined sections SA, SB, SC, SD and SE and create clearance check chart to validate.
• At all the five sections the value of L should be greater than 10mm to qualify the eropean standards.
• the wheel guard requirement :- same as japan

US Regulations

• clearance L is to be checked at all position from -100* to 100* and create clearance check chart to alidate.
• The value of L should br greater than 5mm to qualify the US regulatins
• wheel guard requirements :- same as the japan

caculation of wheel arch area :-

European Regulations:- for calculation of clearance bt wheel arch and wheel we have to create a sketch on the outer most face of wheel and the procedure as follws.

from the given part file, we need to open in the NX cad and from the part file they give the fender and from the wheel. so, now we need to check for the European regulation standard. Now we need to the a datum plane at the outer most face of tire as shown in fig.

after that in that plane we sketch the lines and give proper angle from the reference of the Europea standard fwawing by using the rapid dimension as shown in fig.

and using the text commond give the proper name to the lines and the dimentions are set asper European standards as shown in fig.

then we need to measure the distance from the outer most wheel face to the outer most fender edge or arch for that we add the some points on the dace nad the angle line as shown in fig.

and now using the analysis tab in the NX cad in that click simple distance to measure the require didtance as the Eurpean standards as shoen in fig. 

standards:

1. A should be more than 5mm at line 30degree forward and 50 degree.

2. L should be greater than 10mm.

from the measureing for clearence are given below

for L values:

Section A (SA)  = + 9.9490mm 

 

section B (SB) = +10.000mm

section C (SC) = -0.113mm

 

section D (SD) = -2.962mm

section E (SE) = -6.164mm

and the results are tabulated which is given below

Sections	L>10 mm	Result
Section A	9.949 mm	Fail
SEction B	10.00 mm	Pass
Section C	-0.113 mm	Fail
Section D	-2.962 mm	Fail
Section E	-6.164 mm	Fail

conclusion:- 

from the above result we can conclude that the fender does not pass the European regulation as the minimum clearance L( 10.00mm min) between the fender arch to the outer most face of wheel for cehicle and pedestrian safety is 10mm and this skin data does not meet the requirement.

my suggestion for skin team is to increase the curvature of fender in section SC, SD, and SE.

thanks and regards 

uday singh baghel