Analysis of efficiency of application of vehicle loading simulation procedure with quasistatic approach

Introduction (problem statement and relevance). A comparative study was performed regarding two most common approaches to vehicle loading simulation: dynamic approach and quasistatic approach. The purpose of the study is a comparative analysis of procedures to simulate vehicle loading, including multi-axial vehicles and articulated vehicles, in order to determine their applicability limits, labor costs and conduct a comparative analysis of the results, as well as substantiate feasibility of using the quasistatic simulation procedure for different vehicle types at the initial design stages through performance assessment.

 Methodology and research methods. The following methods were applied: simulation mathematical modeling; statistical data processing; formalization and specification of design or calculation loading modes based on the vehicle theory formulas.

 Scientific novelty and results. The results are shaped in the form of a descriptive part of comparison of quasistatic and dynamic loading simulation procedures. Some results of approbation indicating suitability of use at the initial stages of design and relative efficiency of the quasistatic simulation procedure are also presented. The scientific novelty consists in application of the procedure to simulate multi-axial vehicle loading according to the “loading-unloading-statics” principle considering simultaneous influence of inertia loads and loads in the tyre-to-road contact patch which are calculated by means of the developed algorithm with feedback based on the data on the grip and brake properties of the vehicle, and also on the necessary acceleration values. Upon that, the multi-link model preserves a quasistable balance state. Using the quasistatic simulation method allows to reduce the solution time by more than tens of times, and in case of covering the full cycle of model preparation and calculations, efficiency increases from 4 to 40% depending on the quantity of the necessary loading modes. At the same time, increase of the loading modes quantity leads to increase of efficiency with the use of the quasistatic simulation procedure.

 Practical significance. This paper demonstrates the limits of applicability of the procedure of quasistatic simulation of vehicle loading for driving modes with acceleration. A comparative analysis of efficiency in terms of simulating loads on the running gear elements of a multi-axle vehicle has also been carried out.

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