In order to improve the vibration isolation performance and ride comfort of commercial vehicles under low-frequency external excitation environment,a new suspension system with quasi-zero stiffness is designed based on the theo-ry of quasi-zero stiffness.In this system,the negative stiffness disc spring group is combined with the positive stiffness air spring by using the parallel connection of positive and negative stiffness.Through the analysis of statics characteristics,the expressions of force displacement and stiffness displacement are established,and the parameter conditions for the system to reach the quasi-zero stiffness are obtained;By analyzing the dynamic characteristics,a 2-DOF model of the system and a nonlinear motion differential equation under the action of harmonic force are established,and the force transfer rate charac-teristic curve is obtained and analyzed.The results show that the low-frequency vibration isolation performance of the new structure is significantly improved.Based on the stiffness displacement expression,a 2-DOF quarter of the suspension model is established to analyze the differences in ride comfort indicators,such as the vertical acceleration,suspension dynamic stroke,and tire dynamic load,between the quasi-zero stiffness system and the traditional system.The simulation results show that the ride comfort improvement effect of the quasi-zero stiffness system is also better than that of the traditional structure.
关键词
振动与波/准零刚度/碟形弹簧/低频隔振/动态特性分析/平顺性
Key words
vibration and wave/quasi-zero stiffness/disc spring/low-frequency vibration isolation/dynamic character-istic analysis/ride comfort
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