DYNAMIC OF THE OPERATIONAL EQUIPMENT ON THE TMM-3M BRIDGE DURING THE LOWERING OF THE INTERMEDIATE SUPPORT LEGS

Abstract

The TMM-3M Sheavy mechanized bridge is a rapid-deployment bridging device produced by the Soviet Union, primarily used in military applications. Each
TMM-3M bridge vehicle consists of operational equipment and the Kraz255B base vehicle. The TMM-3M bridge deployment process has four stages, with the
final stage being the lowering of the intermediate support legs. During this stage, the bridge span shakes violently while lowering the support legs. This paper
presents a dynamic model of the operational equipment on the TMM-3M mechanized bridge during the lowering of the intermediate support legs, considering
the elastic deformation of the cables holding the bridge span and the impact of friction in the rotary joints on the lowering process. The system's differential
equations describing the oscillations of the mechanical system are established using Lagrange's equations of the second kind and solved through simulation in
Matlab software. The results of the paper indicate the oscillations of the support legs and the bridge span and determine the cable tension during the lowering
process, providing a basis for comprehensively studying the lowering process to enhance the safety features of the bridge system and reduce deployment time.