Research On Uncertain Multidisciplinary Optimization Design Of Electric-Wheel Vehicle Chassis System

The electric-wheel vehicle chassis system is an organic whole composed of multiple disciplines with complex relations and mutual coupling,and there are many uncertainties in it.It is easy to obtain the inaccurate overall optimal results by deterministic optimization methods,which cannot reach the ideal practical application effect.Therefore,this paper focuses on the research on uncertain multidisciplinary optimization design of electric-wheel vehicle chassis system to ensure the robustness and reliability of the vehicle's comprehensive performance.The main contents of this paper are organized as follows:Firstly,the dynamic models of the entire vehicle and the chassis system,including the vehicular dynamic model,the chassis subsystem dynamic models,the tire model and the road excitation model,are established to lay a theoretical foundation for the proposal of subsequent performance evaluation indices and research on integrated optimization.Secondly,the comprehensive performance index ‘Steady endurance performance' of electric-wheel vehicle chassis system is put forward and quantified objectively.The vehicle steadiness performance index involves steering road feeling,steering sensitivity,steering stability and semi-active suspension ride comfort.The vehicle endurance property index involves steering energy consumption and driving energy consumption.On this basis,considering the interactions among the chassis subsystems,the model for the electric-wheel vehicle chassis system with bi-level integrated system collaborative optimization(BLISCO)method is built up and the integrated optimization design of the electric-wheel vehicle chassis system is carried out.Finally,an uncertain layered collaborative optimization(ULCO)method considering the uncertainties of the system is proposed by introducing the concept of uncertainty into the traditional BLISCO method.At the system level,the reliability of uncertain optimization results is analyzed.The integrated optimization of chassis system in both robustness and reliability is carried out to ensure that the integrated optimization results of electric-wheel vehicle chassis system can always maintain a reasonable level under the influence of uncertainties.The research results of this paper verify the feasibility and effectiveness of the uncertain multidisciplinary optimization of the electric-wheel vehicle chassis system.It improves the comprehensive performance of the entire vehicle and provides theoretical basis and technical support for the integrated optimization design of the electric-wheel vehicle chassis system.