These requirements make the model highly non-linear and, therefore, the classic approaches which would be used in multi-body tools for flexible body simulation are no longer applicable. In order to be reliable enough, the virtual model must reproduce both the large deformation of the structure and the contacts occurring along the entire body (self-contacts). In order to store the powering energy for the music box, a spiral spring is manually wound. This is a classic scenario that exploits the best features of RecurDyn software, such as the Full-Flex and the Geo-Contact technology. A virtual prototype of a music box must necessarily include highly flexible bodies and the extended contacts with their surfaces. As the fan reaches high speed, the drag torque works as a brake to control the unwinding speed. The main drum also powers a micro fan through a gear train with a large transmission ratio. The mechanism is powered by the elastic energy stored in a spiral spring, which is manually wound. A music box or musical box is an automatic musical instrument in a box that produces musical notes by using a set of pins placed on a revolving cylinder or disc to pluck the tuned teeth (or lamellae) of a steel comb. Although this example is not about an industrial component, its dynamics are very complex, and its analysis requires special care.
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