Developing the procedure of simulation of loading of the open-pit dump truck by means of cascading the external force factors

Introduction (problem statement and relevance). Ensuring the necessary strength, stiffness and durability of load-bearing structure components of open-pit dump trucks is an important engineering task in the absence of regulations and standards of loading simulation. Therefore, the focus area of developing and accumulating of the regulatory and methodical base for building an effective design process for chassis and load-bearing systems of open-pit dump trucks is highly relevant. The purpose of the study is to develop the procedure for simulation of open-pit dump truck loading by means of cascading the external force factors in order to determine the standardized sequence when forming a cascade of test loads acting on mechanical parts of the open-pit dump truck in the initial design stages. Methodology and research methods. According to the goals and objectives of the study, the following methods were assigned: the mathematical simulation method; statistical data processing methods; formalization and specification of calculated load cases based on vehicle theory formulas. Scientific novelty and results. The results are formed as a descriptive part of the main peculiarities of the open-pit dump truck loading simulation procedure as well as some intermediary approbation results proving the suitability, efficiency and reasonability of the procedure developed. The scientific novelty consists in application of the open-pit dump truck loading simulation method on the principle of “loading –unloading – statics” considering the simultaneous influence of inertia loads and loads in the tyre-to-road contact patch while maintaining the quasistable state of the dynamic model, which relatively reduces the simulation time by more than 20%. Practical significance. The procedure developed is recommended to be applied in the early design stages in order to simulate typical and non-typical open-pit dump truck operational conditions or modes so that to define the loads acting on the open-pit dump truck load-bearing system and chassis suspension guiding devices for further operational reliability calculations.