Body & Chassis Design Body & Chassis Design G. N. Kotwal
Contents • Considerations • Body Design : Body Design : – Body Styles – sedan, hatchback, station wagon, SUV, etc. – Body Shell Body Shell – Body Components : Bumpers, grills, glasses, headlights, etc. – Body interiors – passenger compartment – restraint systems, airbags, Dashboard, trimmings, seats, materials, HVAC. t i l HVAC
• Chassis Design :
Vehicle Structure Requirements Vehicle Structure Requirements • To maintain the shape of the vehicle and to support the various loads applied to it. • Accounts for a large part of the development and manufacturing cost in a new vehicle. • Imp. Criteria : strength and stiffness. • A design aims to achieve these with as little mass as possible. • Structural Design involves – – Selection of type. – Proper Element layout for continuous load paths (equilibrium of Proper Element layout for continuous load paths (equilibrium of edge forces between simple structural surfaces) – Sizing of Panels, Sections & Joints.
Strength & Stiffness • Sufficient Strength for all load cases. (Resistance against failure) • Stiffness – Deflections within elastic limit. • Low stiffness Low stiffness – Lot of vibrations, Alteration in Lot of vibrations Alteration in Geometry. Major ones necessary : – Bending Stiffness Bending Stiffness – Torsional Stiffness Vibrational Behaviour decided by stiffness & natural decided by stiffness & natural freq.
Body Made of steel, aluminum, fiberglass, Made of steel aluminum fiberglass plastic, or composite materials Forms the outside of the vehicle Forms the outside of the vehicle Serves as an attractive covering for the chassis h i Integral with Chassis for Light Vehicles (Wt.
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