新型准零刚度果蔬运输隔振系统设计

Design of a New Quasi-zero Stiffness Vibration Isolation System for Fruit and Vegetable Transportation

目的为避免果蔬在运输过程中因振动造成损伤,导致价值下降,基于准零刚度隔振技术,提出一种采用紧凑、高效的弹簧-滚轮-滚珠负刚度机构的新型果蔬运输隔振箱装置。方法首先,基于弹簧-滚轮-滚珠负刚度机构与垂向正刚度弹簧并联的方式设计准零刚度果蔬运输隔振系统结构;其次,分析其静力学特性,推导该非线性隔振装置的刚度特性;最后,在果蔬运输系统模型运动微分方程基础上建立Simulink仿真模型,研究在C级路面激励下,该新型运输隔振系统的动态隔振特性。结果研究结果表明,通过合理的结构参数设计,该隔振装置在平衡点附近将具有高静态刚度、低动态刚度的准零刚度特性。在C级路面激励下,该新型运输隔振系统的振动位移峰的峰值相较于对应线性系统的衰减约29.3%,加速度均方根值衰减约97.3%。结论设计合理的新型果蔬运输系统的隔振效率优于对应的线性隔振系统的。

The work aims to propose a new fruit and vegetable transportation vibration isolation box device with compact and efficient spring-roller-ball negative stiffness mechanism based on the quasi-zero stiffness vibration isolation technology,so as to avoid the damage and value decline caused by vibration in fruit and vegetable transportation.Firstly,the structure of vibration isolation system of quasi-zero stiffness for fruit and vegetable transportation was designed based on the parallel connection of spring-roller-ball negative stiffness mechanism and vertical positive stiffness spring;Secondly,the static characteristics were analyzed,and the stiffness characteristics of the nonlinear vibration isolation device were deduced;Finally,based on the motion differential equation of the fruit and vegetable transportation system model,a Simulink simulation model was established to study the dynamic vibration isolation characteristics of the new transportation vibration isolation system under level-C road excitation.The research results showed that the vibration isolation device may have the quasi-zero stiffness with high static stiffness and low dynamic stiffness near the balance point through reasonable design of structure parameters.Compared with the corresponding linear system,the peak to peak value of vibration displacement and the RMS value of acceleration of the new transportation vibration isolation system decreased by 29.3%and 97.3%respectively under level-C road excitation.The vibration isolation efficiency of the new fruit and vegetable transportation system with reasonable design is superior to that of the corresponding linear vibration isolation system.