The responses of the pavement in service are the basis for the design of the semi-rigid base course asphalt pavement. Due to the dynamic characteristics of wheel loacis and the temperature loads, the dynamic response ...The responses of the pavement in service are the basis for the design of the semi-rigid base course asphalt pavement. Due to the dynamic characteristics of wheel loacis and the temperature loads, the dynamic response analysis is very significant. In this article, the dynamic analysis of asphalt pavement under moving wheel loads is carried out using finite dement method canpled with non-reflective boundary method. The influences of the base modulus, thickness, the vehicle velocity, the tire pressure, and the contact condition at the interface are studied using parametric analysis. The results of numerical analysis show that it is not appropriate to simply increase the base modulus or thickness in the design. It would be beneficial if the base design is optimized synthetically. The increase of damping is also beneficial to the pavements because of the surface deflection and the stresses declination. Furthermore, the good contact condition at the interface results in good performance because it combines every layer of the pavement to work together. As overload aggravates the working condition of the pavement, it is not allowed.展开更多
为了分析压缩感知宽带接收机的性能损失,明确其适用范围,设计了一种基于调制宽带转换器(MWC)结构的压缩感知宽带接收机,并针对该接收机的无杂散动态范围进行仿真分析和实验测量。仿真分析和实测结果表明,字典基之间非正交性将会导致接...为了分析压缩感知宽带接收机的性能损失,明确其适用范围,设计了一种基于调制宽带转换器(MWC)结构的压缩感知宽带接收机,并针对该接收机的无杂散动态范围进行仿真分析和实验测量。仿真分析和实测结果表明,字典基之间非正交性将会导致接收机无杂散动态范围的严重损失,在1/2压缩采样率的条件下,接收机无杂散动态范围仅能达到7 d B左右,这将严重限制压缩感知宽带接收机在高动态范围要求环境下的应用。展开更多
基金This paper is supported by the Programfor New Century Excellent Talents in University(2004)and Highway Depart ment of Henan Province
文摘The responses of the pavement in service are the basis for the design of the semi-rigid base course asphalt pavement. Due to the dynamic characteristics of wheel loacis and the temperature loads, the dynamic response analysis is very significant. In this article, the dynamic analysis of asphalt pavement under moving wheel loads is carried out using finite dement method canpled with non-reflective boundary method. The influences of the base modulus, thickness, the vehicle velocity, the tire pressure, and the contact condition at the interface are studied using parametric analysis. The results of numerical analysis show that it is not appropriate to simply increase the base modulus or thickness in the design. It would be beneficial if the base design is optimized synthetically. The increase of damping is also beneficial to the pavements because of the surface deflection and the stresses declination. Furthermore, the good contact condition at the interface results in good performance because it combines every layer of the pavement to work together. As overload aggravates the working condition of the pavement, it is not allowed.
文摘为了分析压缩感知宽带接收机的性能损失,明确其适用范围,设计了一种基于调制宽带转换器(MWC)结构的压缩感知宽带接收机,并针对该接收机的无杂散动态范围进行仿真分析和实验测量。仿真分析和实测结果表明,字典基之间非正交性将会导致接收机无杂散动态范围的严重损失,在1/2压缩采样率的条件下,接收机无杂散动态范围仅能达到7 d B左右,这将严重限制压缩感知宽带接收机在高动态范围要求环境下的应用。
