Dynamic property characterization in gear rings made from powdered metal**

斯塔克波尔国际是一家以粉末金属为原材料的汽车传动系零部件制造商。为了保持商业竞争力和扩大产品供应，斯塔克波尔不断寻找优化生产效率和最大限度提高产品质量的方法。该项目的重点是开发更全面地了解如何修改金属粉末制造工艺以更好地控制所生产的固体金属部件的减振特性。成功将导致一系列明确定义的工艺条件，这些工艺条件将促进提高制造效率，并允许控制部件的减振特性。这两个结果都将大大提高Stackole的盈利能力。*这个项目的目标是双重的。首先是建立准确的知识库，将粉末金属制造参数与粉末金属固体零件中微观组织和气孔的形成联系起来。这个知识库将建立在现有研究成果和一系列实验的基础上。第二个目标是建立粉末金属零件的微观结构和孔隙率之间的精确关系，以及它们对减振(振动频率响应衰减)的影响。我的贡献将是振动响应测量(使用模态分析技术)，然后与制造输入参数和建模(使用有限元分析)结果相关联。最终目标是提供对制造过程输入参数的约束，以便更好地控制最终产品质量。**

Stackpole International is a manufacturer of automotive drivetrain parts using powder metal as a raw material. In order to remain commercially competitive and extend product offerings, Stackpole continually searches for ways to optimize production efficiency and maximize product quality. The focus of this project is the development a fuller understanding of how powder metal manufacturing processes can be modified to better control the damping characteristics of the solid metal parts produced. Success will result in a range of clearly defined process conditions that will facilitate improved manufacturing efficiency and allow control over part damping characteristics. Both of these outcomes will significantly improve Stackpole's profitability.****The objectives of this project are two-fold. The first will be to establish an accurate knowledge base relating powder metal manufacturing parameters with the formation of microstructures and pores in the powder metal solid parts. This knowledge base will be built on existing research results and a series of experiments. The second objective will be to develop accurate relationships between microstructure and porosity in the powder metal parts and their effects on damping (vibration frequency response attenuation). My contributions will be in the area of vibration response measurements (using modal analysis techniques) that are then correlated with manufacturing input parameters and modeling (using Finite Element Analysis) results. The ultimate goal is to provide constraints on the manufacturing process input parameters that will allow better control over final product quality.**