International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

A new methodology for taking into account of the cargo pendulum angle change at minimum operating radius of the gantry cranes level luffing jib systems is proposed. The impact of this change in electric motor power calculating has been studied. An optimization mathematical model that takes into account this change and the impact of node displacements on the design of the gantry cranes level luffing jib systems is built. Parameters, optimization criteria and their boundaries are determined. Optimization of the construction taking into account these factors was made using the Pareto optimization procedure and the results were compared with previous studies.

Initial stresses of soil body are important upon penetration of long length underground pipelines (tunnels) into soil. If there is a free space between cassing (lining) and body the soil grains move to the free space. Value of free space is called “soil loss”. Movements may occur due to this free space filling with soil at the daylight surface. If the movements reach a great significance, aboveground structures and neighboring underground structures may be significantly damaged. Therefore, an evaluation of soil subsidence and pipeline (tunnel) stability are of great concern upon the pipelines (tunnels) designing.