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利用离散元法及正交设计方法,对典型轮体结构发生伞形振动时的二维等效振动模型进行了空腔尺寸及颗粒填充方案的数值设计,并结合振动试验结果给出了轮体结构颗粒阻尼器的设计流程及设计准则.研究表明:1建立的二维等效振动模型在能够反映轮体结构伞形振动基本特征的同时,也可以较为准确地模拟内部颗粒运动对结构产生的影响;2颗粒阻尼对轮体结构的振动有明显的改善作用,但填充不同材质的颗粒,其减振效果会有较为明显的区别;3空腔的尺寸及颗粒的质量率对颗粒阻尼的影响显著,应首先保证的是较高的颗粒质量率;4由于碰撞间隙的作用,对于固定规格的空腔和颗粒,存在最佳颗粒体积填充率使得颗粒阻尼的减振效果最佳.由试验与数值模拟的最佳方案的一致性可知,发展的设计方法可以较为准确地给出轮体结构颗粒阻尼器的最优空腔尺寸及其对应的最佳填充方法,可用于轮体结构伞形振动减振方案的前期设计.
Based on the discrete element method and the orthogonal design method, the cavity dimension and the particle filling scheme are numerically designed for two-dimensional equivalent vibration model of a typical wheel body with umbrella-shaped vibration. According to the vibration test results, The design flow and design criteria of the structural particle damper show that the two-dimensional equivalent vibration model established can reflect the basic characteristics of the umbrella-shaped vibration of the wheel structure and also can accurately simulate the effect of internal particle motion on the structure 2 particle damping has a significant improvement on the vibration of the wheel body structure, but the damping effect of the particles filled with different materials will have a more significant difference; 3 the size of the cavity and the particle mass rate on the particle damping Significantly, the higher mass fraction of particles should be ensured first. (4) Due to the effect of collision clearance, the optimum particle volume filling rate for the cavity and particle with fixed specifications makes the damping effect of particle damping the best. Numerical simulation of the best program consistency, we can see that the development of design methods can be more accurate given wheel body structure of the optimal particle size of the cavity and its corresponding The best filling method can be used in the pre-design of the umbrella-shaped vibration damping scheme of the wheel structure.