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

考虑小振动控制的机械结构阻尼特性和摩擦学特性

基本信息

批准号：
09650151
负责人：
HASHIMOTO Masatoshi
金额：
$ 2.18万
依托单位：
Toyota National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

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.

本研究针对机械结构的微小振动控制。机械结构由一些部件组成，因此研究这些材料之间的接触机理对于提高结构的阻尼特性具有重要意义。然后，用精密机用虎钳将结构材料固定在固定块之间，并检查添加脉冲输入时的阻尼行为和接触刚度。接下来，通过实验检查将球插入结构的中空部分时的阻尼特性。首先，用冲击锤激励空心结构或装球结构，并根据响应波形估计阻尼行为。结果，从这些实验中获得了结构的接触刚度和阻尼特性。首先，接触部分的阻尼特性根据输入和夹紧负载而变化，从阻尼特性判断存在最佳夹紧条件。当夹紧载荷较低时，这些部件之间会发生宏观滑移，从而获得较大的阻尼能力。当夹紧载荷较高时，会发生微滑移，阻尼能力略有降低。阻尼的后一种状态对于实际工程操作很重要。这些阻尼能力的解释是从与微凹凸表面接触的角度进行的。此外，球填充结构的阻尼特性还受到球材料种类、球尺寸和球填充密度的影响。此外，已经了解到，通过插入的球材料、球尺寸和球的填充密度，振动特性得到极大改善。