基于压电驱动器激励振动的机械力学式除冰技术是一种重量小和能耗低的新型除冰技术,用于应对航空结冰威胁问题。其中机械振动引起的界面剪切应力和相应结构振动模态是该除冰技术研究中的两个重要方面。寻找合适的振动模态来产生足够的...基于压电驱动器激励振动的机械力学式除冰技术是一种重量小和能耗低的新型除冰技术,用于应对航空结冰威胁问题。其中机械振动引起的界面剪切应力和相应结构振动模态是该除冰技术研究中的两个重要方面。寻找合适的振动模态来产生足够的界面剪切应力以提高除冰效率是研究中的重要内容。薄板的振动模态通常用横向轴线和纵向轴线上的反节点数m和n来描述。本文目的是研究不同结构弯曲振动模态下除冰剪切应力的分布特征,从而为基于机械振动的结冰防护系统(Ice protection system,IPS)的详细设计建立目标振动模态的选择依据。通过理论分析和仿真计算,建立了界面剪切应力与结构振动模态参数之间的关系。采用“冰层⁃平板⁃压电陶瓷”的有限元分析模型(Finite element model,FEM),仿真计算了不同振动模态下的应力应变水平,并根据仿真和实验结果分析了除冰剪切力的分布特征。最终给出了基于弯曲振动模态参数m和n的特征来确定除冰模态的选择标准。展开更多
The rolling treatment of steel/mushy Al 20Sn bonding plate was conducted under different relative reduction at room temperature. The effect of room temperature rolling on interfacial mechanical property of bonding pla...The rolling treatment of steel/mushy Al 20Sn bonding plate was conducted under different relative reduction at room temperature. The effect of room temperature rolling on interfacial mechanical property of bonding plate was studied. The results show that, for steel/mushy Al 20Sn bonding plate which consists of 1.2mm thick 08Al steel plate and 2.0mm thick Al 20Sn layer, the relationship between interfacial shear strength and relative reduction is S=70.1+5.48r-r 2 (S is interfacial shear strength, r is relative reduction). When the relative reduction is 2.74%, the largest interfacial shear strength 77.6 MPa can be obtained.展开更多
基金funded by the National Natural Science Foundation of China(Nos.11832012,12227802)the Fundamental Research Funds for the Central Universities(No.3082020NP2020402)the support of the State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics and Astronautics。
文摘基于压电驱动器激励振动的机械力学式除冰技术是一种重量小和能耗低的新型除冰技术,用于应对航空结冰威胁问题。其中机械振动引起的界面剪切应力和相应结构振动模态是该除冰技术研究中的两个重要方面。寻找合适的振动模态来产生足够的界面剪切应力以提高除冰效率是研究中的重要内容。薄板的振动模态通常用横向轴线和纵向轴线上的反节点数m和n来描述。本文目的是研究不同结构弯曲振动模态下除冰剪切应力的分布特征,从而为基于机械振动的结冰防护系统(Ice protection system,IPS)的详细设计建立目标振动模态的选择依据。通过理论分析和仿真计算,建立了界面剪切应力与结构振动模态参数之间的关系。采用“冰层⁃平板⁃压电陶瓷”的有限元分析模型(Finite element model,FEM),仿真计算了不同振动模态下的应力应变水平,并根据仿真和实验结果分析了除冰剪切力的分布特征。最终给出了基于弯曲振动模态参数m和n的特征来确定除冰模态的选择标准。
文摘The rolling treatment of steel/mushy Al 20Sn bonding plate was conducted under different relative reduction at room temperature. The effect of room temperature rolling on interfacial mechanical property of bonding plate was studied. The results show that, for steel/mushy Al 20Sn bonding plate which consists of 1.2mm thick 08Al steel plate and 2.0mm thick Al 20Sn layer, the relationship between interfacial shear strength and relative reduction is S=70.1+5.48r-r 2 (S is interfacial shear strength, r is relative reduction). When the relative reduction is 2.74%, the largest interfacial shear strength 77.6 MPa can be obtained.
