Torsion resistant chassis design for the Kalmar Cargotec empty container truck : A study to reduce swinging effect while handling elevated loads
Sammanfattning: Kalmar Cargotec is a company offering solutions for container and heavy industrial material handling. One of their products, EC-truck (empty container), lifts objects as heavy as 11 tonnes and sometimes as high as 16 meters vertically up in the air. Lifting very heavy objects high up in the air can cause the pulse to rise if unwanted movement is caused due to strong winds. This thesis was raised by Kalmar Cargotec, to study if the swinging effect of the elevated load could be reduced by increasing the torsional resistance of the truck chassis framework. The project work will be conducted at the engineering consultancy firm Citec AB in Karlstad, whom together with Kalmar Cargotec, offered the opportunity for this thesis. Concepts were generated for the chassis framework to find a new and improved design. The conceptual designs were compared both numerically, through the finite element analysis based program Mechanical, and analytically. The three best performing concepts were studied further with more variables accounted for where one was picked to be implemented in a large scale computational model. It was discovered that it is possible to reduce the swinging effect of the mast by replacing the current U-profiled beams in the chassis framework with hollow rectangular cross-sectional beams.
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