A domain association hierarchical decomposition optimization method for cab vibration control of commercial vehicles

•Directional decomposition of vehicle system will be more purposeful.•Interactive parameters model of subsystem forms vibration optimization basis.•Resonance frequency deviation ways of vehicle makes vibration control effectively.•Nonlinear and scaling ways of damping have good vibration adjusting ability.•Vibration signals of domain center express remarkable characteristics. The dynamical vibration responses of a commercial vehicle’s cab can seriously affect ride comfort; Multi-source excitation effects of commercial vehicle will cause a great interference for specific research target. This paper presents a domain association hierarchical decomposition method, researches the possibility of decreasing vibration responses from related vibration transfer path research, enhances the clarity of the analysis and simplifies the number of decomposed subsystems. Firstly, the whole vehicle model is decomposed into subsystem layers and part layers relevant to a cab, and the cab vibration acceleration value is chosen as the optimization objective. Secondly, in terms of different decomposed layer subsystems, the constraint function and the weight factors of the corresponding mathematical models are established, and the elastic element parameters of the hierarchical fault levels are optimized with the appropriate matching improvement scheme. Thirdly, due to the linear parameter matching scheme of the cab mount not being obvious, a series of improved scaling weight factors and combined linear and nonlinear schemes are introduced based on an experimental design. Finally, by proposing an optimization criterion of maximum deviation degree, the optimal matching scheme is found through the interaction of information between the subsystem layers and part layers, obtaining the most suitable matching mode and damping scaling ratio for the part layer. The experimental results show the effect of proposed method and prove its advantages in countering vibration control problems.