Component Optimisation Driven by Flexible Body Vehicle Dynamics

The truck and trailer industry demands products which have:

  • Maximum Payload

  • a fatigue life of more than 1 million kilometers

  • Minimum operation costs

To achieve this maximum payload the weight of the truck and or trailer have to be therefore as low as possible. To achieve this low weigth a flexible frame structures is used. And while in the car industry normally the first mode of a Body In White (BIW) is around 15 Hz, the first frame mode for a truck frame can already start around 2 Hz.

With the normal modes starting so low the durability of the frame has a close knit interaction with the excitation of the tyres by the road. Designing an component (e.g. a sparewheel bracket) which has to be attached to a frame therefore not only requires fullfilling static loads but also a dynamic response check and eventually a running mode analysis.

After isolating these critical static loads, mode shapes and stiffness requirement out of a full vehicle model the optimisation can be done on the component itself by the use of optistruct.

In this way a component with reduced weight can be designed which not only fullfils the design requirements for the components itself but also garantees an interface between the component and the frame which fullfills the design requirements.

The Author

Jeroen Krijnen,
Team Leader Engineering Analysis
VIRO Engineering
Newtonweg 3
6101 WX Echt
The Netherlands

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