Natural materials are formed with integral structures.Based on the achievements of our predecessors,the microstructures of some natural materials were decoded,and the configurations of integrated structures were inter...Natural materials are formed with integral structures.Based on the achievements of our predecessors,the microstructures of some natural materials were decoded,and the configurations of integrated structures were interpreted with graded,porous,fractal and composite forms.The composition and spatial gradients of multiple kinds of physical parameters,which included elastic modulus,hardness,surface tension,stiffness,damping factor,density,heat conduction,electrical resistance factor,magnetic conductive factor,light penetration factor etc,are summarized.The 2-D and 3-D porous structures were analyzed,which had different types of voids and configurations.Then the fractal and gradient fractal rules were described with leaf structure.Moreover,the particulate and fibrous composite structures were developed with the combination of graded,porous and fractal rules.Finally,complex bionic design based on nets of blood vessels and nerves were proposed,which could be applied in structure design of mechanical parts.展开更多
从试验研究与理论分析两个方面综述了滚动轴承的振动测试、振动模型、影响因素研究。试验研究包括速度测试、加速度测量与声强分析;理论分析有振动理论模型、影响噪声的因素。振动理论模型有TimoshenkoS P模型J、ohnson K L模型和Nayak ...从试验研究与理论分析两个方面综述了滚动轴承的振动测试、振动模型、影响因素研究。试验研究包括速度测试、加速度测量与声强分析;理论分析有振动理论模型、影响噪声的因素。振动理论模型有TimoshenkoS P模型J、ohnson K L模型和Nayak P R模型等,影响滚动轴承的噪声与异常声的主要因素有零件几何误差、表面粗糙度、表面波纹度、零件的表面缺陷、污染物的影响、保持架的影响、轴承的刚度与阻尼、润滑油或脂的驰豫特性等。最后提出了混合润滑状态下轴承噪声、消除异常声研究仍需解决的几个问题。展开更多
基金This research is supported by the Natural Science Foundation of China(50175099),and Natural Science Foundation of Zhejiang Province in China(Y104427).
文摘Natural materials are formed with integral structures.Based on the achievements of our predecessors,the microstructures of some natural materials were decoded,and the configurations of integrated structures were interpreted with graded,porous,fractal and composite forms.The composition and spatial gradients of multiple kinds of physical parameters,which included elastic modulus,hardness,surface tension,stiffness,damping factor,density,heat conduction,electrical resistance factor,magnetic conductive factor,light penetration factor etc,are summarized.The 2-D and 3-D porous structures were analyzed,which had different types of voids and configurations.Then the fractal and gradient fractal rules were described with leaf structure.Moreover,the particulate and fibrous composite structures were developed with the combination of graded,porous and fractal rules.Finally,complex bionic design based on nets of blood vessels and nerves were proposed,which could be applied in structure design of mechanical parts.
文摘从试验研究与理论分析两个方面综述了滚动轴承的振动测试、振动模型、影响因素研究。试验研究包括速度测试、加速度测量与声强分析;理论分析有振动理论模型、影响噪声的因素。振动理论模型有TimoshenkoS P模型J、ohnson K L模型和Nayak P R模型等,影响滚动轴承的噪声与异常声的主要因素有零件几何误差、表面粗糙度、表面波纹度、零件的表面缺陷、污染物的影响、保持架的影响、轴承的刚度与阻尼、润滑油或脂的驰豫特性等。最后提出了混合润滑状态下轴承噪声、消除异常声研究仍需解决的几个问题。
