Damping Characteristics and Tribological Properties of Machine Structure Considering the Small Vibration Control

本研究主要针对机械结构的微小振动控制。机械结构是由多个部件组成的，研究这些部件之间的接触机理对提高结构的阻尼性能具有重要意义。然后，结构材料被固定在保持器块之间的精密机械虎钳，和阻尼行为和接触刚度时，增加了脉冲输入进行了检查。其次，通过实验研究了当球插入结构的中空部分时的阻尼特性。首先，用冲击锤对空心结构或填充有球体的结构进行激振，根据响应波形估计结构的阻尼特性，从而得到结构的接触刚度和阻尼特性。首先，接触部的阻尼特性根据输入和夹紧载荷而变化，从该阻尼特性可知存在最佳夹紧条件。当夹紧载荷较低时，这些部件之间发生宏观滑移，从而获得大的阻尼能力。当夹持载荷较大时，出现微滑移，阻尼能力略有降低。阻尼的后期状态对真实的工程运行具有重要意义。这些阻尼能力的解释是从与微凸体的表面接触点进行的。此外，填充有球的结构的阻尼特性受球材料的种类、球尺寸和球的填充密度的影响。此外，可以理解的是，通过插入的球材料、球尺寸和球的填充密度，振动特性大大改善。

This research aims at the small vibration control of the machine structure. The machine structure combines some components, so it is important for improving the damping characteristic of the structure to examine the contact mechanism between these materials. Then, the structural material is fixed between the holder blocks with the precise machine vise, and the damping behavior and the contact rigidity are examined when the impulse input is added. In the next place, the damping characteristic is examined experimentally when the balls are inserted into the hollow part of the structure. First of all, the hollow structure or the structure packed with balls is excited with the impact hammer, and the damping behavior is estimated from the response wave form.As a result, the contact rigidity and the damping characteristic of the structure are obtained from these experiments. First of all, the damping characteristic in the contact part changes by the input and the clamping load, and it has been understood that the optimum clamping condition is existed judging from the damping characteristic. When the clamping load is low, a macro-slip between these parts occurs and large damping capacity is obtained. When the clamping load is high, a micro-slip occurs and damping capacity is reduced a little. Latter state of damping is important for real engineering operation. The explanation of these damping capacities is carried out from the point of surface contact with micro-asperities. Moreover, the damping characteristics of the structure packed with balls are influenced by the kind of the ball material, the ball size, and the packing density of the balls. In addition, it has been understood that the vibration characteristic is greatly improved by the inserted ball material, the ball size, and the packing density of the balls.