Analysis of damper element and development of damper using a new energy dissipation concept

实验研究的目的是设计胶体阻尼器，并根据这种新的机械耗能原理进行实验，以便将学术思想转化为真实的产品。为了实现这一点，建立多孔材料的能量耗散特性是非常重要的。设计并研制了一种胶体阻尼器静态试验台。利用该试验台，找到了适用于胶体阻尼器的新型多孔材料，并对多孔材料的疏水涂层进行了改进，以保证更好的阻尼效果。在以往的研究中，第n个磁滞回线的耗散能仅为第1个磁滞回线耗散能的50%。随着新材料的发现，第n个滞后的耗散能增加到第1个滞后能的92-93%。同时也阐明了封端的影响。了解了多孔材料的平均孔径与涂层分子最佳长度之间的关系。不 ...更多信息 本文的研究成果将在今年9月在比利时举行的国际噪声与振动工程会议上发表。针对胶体阻尼器的动态性能，设计并制造了一台单台和一台双台试验台。利用这些试验台，阐明了设计参数对胶体阻尼器性能的影响。这些结果在澳大利亚举行的第10届亚太振动会议上发表。其次，为了评估胶体阻尼器的可靠性，研究了多孔基体及其疏水涂层的强度。结果表明，多孔材料的结构和疏水涂层不受高压的影响。理论研究的目的是基础研究，以发展一个广义的流体动力学理论的流体流动到纳米多孔基质从疏水化硅胶。广义流体力学理论是指保持Navier-Stokes方程的基本结构，但为了考虑宏观流动和液体与疏水涂层的分子相互作用之间的关系，在固体壁面上允许滑移。滑移边界条件的充分描述需要表面扩散系数的知识，即，能量屏障的高度。一个原始的模型，基于涂层分子的异质性，提出了估计的能量障碍。利用该模型，以最大化耗散能为目标，阐明了硅胶平均孔径与包覆分子最佳长度之间的关系。理论结果与实验结果一致。这些结果将于今年7月在美国举行的第五届流体/热/化学/应力系统计算技术国际ASME研讨会上发表，并发表在ELSEVIER，胶体和界面科学杂志上。少

Objective of the experimental investigations was the design of the colloidal damper and experiments upon this novel principle of mechanical energy dissipation, in order to transform an academic idea into a real product. In order to achieve this it is very important to establish the properties of energy dissipation of the porous material. A colloidal damper static test rig was designed and manufactured. Using this test rig, new porous materials suitable for colloidal damper were found, and the hydrophobic coating of the porous material was improved in order to assure better efficiency. In the previous research the dissipated energy of the nth hysteresis was only 50% of the 1st hysteresis energy. With new materials found, the dissipated energy of the nth hysteresis was increased at 92-93% of the 1st hysteresis energy. Influence of the end-capping was also clarified. Relation between the mean pore diameter of porous material and the optimum length of the coating molecule was understood. T … More hese results will be presented this year in September at the International Conference on Noise and Vibration Engineering, Belgium.Concerning the dynamic performances of the colloidal damper, a single test rig and a double test rig were designed and manufactured. Using these test rigs the influence of the design parameters on the colloidal damper performances was clarified. These results were presented at the 10th Asia-Pacific Vibration Conference, Australia. Next, in order to estimate the reliability of the colloidal damper, the strength of the porous matrix and its hydrophobic coating were investigated. It was found that structure of porous material and its hydrophobic coating are not affected by high-pressures.Objective of the theoretical investigations was basic research in order to develop a generalized hydrodynamic theory for the fluid flow into a nano-porous matrix from hydrophobized silica gel. Generalized hydrodynamic theory means that basic structure of Navier-Stokes equations is kept, but in order to include the relation between the macroscopic flow and molecular interactions of the liquid with the hydrophobic coating, slip is allowed on the solid wall. Fully description of the slip boundary condition requires knowledge of the surface diffusion coefficient, i.e., the heights of energy barriers. An original model, based on the heterogeneity of the coating molecules, was proposed for estimation of the energy barriers. Using this model, in order to maximize the dissipated energy, relation between the mean pore diameter of silica gel and the optimum length of the coating molecule was clarified. Theoretical results were in agreement with experimental findings. These results will be presented this year in July at the 5th International ASME Symposium on Computational Technology for Fluid / Thermal / Chemical / Stressed Systems with Industrial Applications, USA and also in ELSEVIER, Journal of Colloid and Interface Science. Less