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

实验研究的目的是胶体阻尼器的设计和实验，基于这种新颖的机械耗散原理，以将学术思想转化为实际产品。为了实现这一目标，建立多孔材料的能量耗散特性是非常重要的。设计并制作了胶体阻尼器静态试验台。利用该试验台，找到了适合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，以保证更高的效率。在以往的研究中，第n次迟滞的耗散能量仅为第1次迟滞能量的50%。随着新材料的发现，第n次迟滞的耗散能量增加到第1次迟滞能量的92-93%。阐明了端盖的影响。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。更多的研究结果将于今年9月在比利时举行的国际噪声与振动工程会议上公布。针对胶体阻尼器的动态性能，设计并制造了单台和双台试验台。通过试验，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十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，研究了多孔基质及其疏水涂层的强度。结果表明，高压对多孔材料及其疏水涂层的结构没有影响。理论研究的目的是基础研究，以建立流体从疏水硅胶流入纳米多孔基质的广义流体力学理论。广义流体力学理论意味着保持Navier-Stokes方程的基本结构，但为了包含液体与疏水涂层的宏观流动和分子相互作用之间的关系，在固体壁面上允许滑移。充分描述滑移边界条件需要了解表面扩散系数，即能量势垒的高度。基于涂层分子的非均质性，提出了一种估算能垒的原始模型。利用该模型，阐明了为使耗散能量最大化，硅胶平均孔径与涂层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国际ASME流体/热/化学/应力系统与工业应用计算技术研讨会上发表，并在ELSEVIER胶体与界面科学杂志上发表。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