硬涂层悬臂梁减振机理分析模型的建立

由于无法有效确定硬涂层阻尼占整个系统阻尼的份额,致使创建硬涂层复合结构减振机理分析模型变得非常困难.从分离硬涂层的阻尼贡献出发,研究了创建硬涂层悬臂梁减振机理分析模型的方法.首先,对涂层前后的悬臂梁系统进行了减振特性实验,获得了固有频率、阻尼比和振动响应.然后,在对涂层前后悬臂梁系统储能及耗能分析的基础上,确定了获取硬涂层材料阻尼贡献的方法.最后,基于Oberst梁理论,创建了同时考虑材料阻尼和等效黏性阻尼的悬臂梁系统减振机理分析模型,并校验了分析模型的正确性.结果表明:利用分离出的硬涂层材料阻尼以及涂层前测试获得的阻尼,可创建用于模拟实际涂层梁系统动力学特性的解析分析模型.

Establishment of Model of Damping Mechanism for the Hard-Coating Cantilever Beam

Unable to confirm the contribution of hard coating damping on the whole system effectively， it becomes very difficult to establish the analytical model of hard coating composite structure of vibration reduction mechanism. The method of creating the damping mechanism model of beam was studied through separating the damping contribution of hard coating. First of all， the cantilever beams before/after coating were tested and the vibration characteristics parameters， such as natural frequency， damping ratio and vibration response were obtained. Moreover， by analyzing the energy stored and dissipated in the uncoated and coated beam， the damping contribution of hard coating was confirmed. At last， the Oberst beam theory was adopted to create the damping mechanism model of cantilever beam， with both material and viscous damping considered， and the correctness of analytical model was also verified. It shows that by using the hard-coating damping and the equivalent viscous damping of uncoated beam， the reasonable analysis model of coated beam can be created.