smc 4133 automotive structures design for vehicle ...arahim/l8-styling [compatibility mode].pdf ·...

SMC 4133 AUTOMOTIVE STRUCTURES

DESIGN FOR VEHICLE & STYLING INTEGRATION

This section describes the task of creating a new body structure concept

that will best meet all design conditions (bending, torsion, crashworthiness,

and vibration.

Designing the best body structure:

1. Determine the best spatial arrangement of structure element:- minimizing mass

2. Design variables:- layout, shape & size

3. Constraints:- strength, stiffness, energy absorption, vehicle packaging &

body exterior

Vehicle layout process to develop vehicle package:

1. Establish occupant package including seating, entry egress & vision

2. Establish the relation of ground with respect to occupants

3. Locate subsystems whose location is mandated by standards

4. Locate the remaining subsystems for functionality

5. Enclose the vehicle in an envelope defined by styling & aerodynamics.



SIDE VIEW

- Seating package for occupant comfort between FCH & BOF



- The rear seat passenger reference point is slightly higher than the front.

- This will then establish the desired knee room.

- With both front & rear occupants oriented, the eye position can be established.



From the occupant package, the

tire location can be positioned with

a minimum clearance: depending

on FWD/RWD configuration

With the tires positioned, the

powertrain can be oriented with

the drive shaft aligned to the wheel

center. In the rear, space for the

cargo & crush distance can be

allocated. This will provide the

minimum overall vehicle length.



- For vertical orientation, seating position is

established with respect to the ground.

- It is depending on the loading conditions:

rebound, curb, design & jounce

- Primary ground clearance requirement = 57mm

The approximate distance from wheel center

to ground at design is 125mm

Other ground clearance conditions are:

- Departure angle

- Curbs

- Break-over-ramp

- Bumper vertical location



Front-view

To establish the most-compact vehicle width, three criteria are considered:

- Occupant seating

- Powertrain package

- Rollover stability



Width required to seat occupants abreast comfortably



Width required to package the powertrain

D = 10m

Width required for rollover stability



Plan-view

Important constraints on body topology are the limits imposed by vision needs

on the upper structure



Exterior Body Surface: Aerodynamics

Aerodynamic forces are important for

vehicle handling and fuel

consumption

smc 4133 automotive structures design for vehicle ...arahim/l8-styling [compatibility mode].pdf ·...

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