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The article has represented the results of researching multiple wheeled chassis (MWC) hydromechanical transmission dynamic loading. On the basis of comparing frequencies of dynamic moment resonant fluctuations and frequencies of diesel engine indignation, the hypothesis about subharmonic resonance realization in the mechanical system having strong nonlinear elastic characteristic is offered and grounded. A method of tuning out undesirable fluctuations which form dynamic loading to take subharmonic resonant modes out of the engine rpm speed working range is developed. On the basis of the results obtained, some technical decisions are suggested which allow decreasing transmission dynamic load and a new type damper designs of different models are developed. It allows taking resonant modes out of the engine rpm speed working range, thus creating the conditions of increasing transmission elements durability.

The paper presents the findings of the investigation of initiation conditions for parametric resonances in the nonlinear system “Engine unit - Torque Converter - Planetary Transmission Elements (Drum and Lined Plate)”. The mentioned oscillations and resonances form dynamic loading of powertrain lined plates. In terms of the research results the paper validates the ways of tuning parametric oscillations. These ways provide for the increasing of durability of multiplate clutches plates of vehicle powertrain. The evaluation of dynamic stability was performed on the basis of the analysis of Mathieu equation and Ince-Strutt diagram. The restriction of modulation depth parameter is proposed by filtering of high-frequency disturbances which are generated in the nonlinear system by different oscillation sources (power unit - internal combustion engine (ICE) or electric motor (EM), hydrodynamic processes in the hydraulic transformer - torque converter or hydraulic coupling, oil supply pump).