参量扬声器是近年来出现的一种新的声源。根据宽带参量阵理论的"Berktay远场解",对参量扬声器的一种信号处理方法——DSB(Double Side Band)法的互调失真问题进行了理论与实验研究。研究发现,DSB法除了存在幅值失真、谐波失真...参量扬声器是近年来出现的一种新的声源。根据宽带参量阵理论的"Berktay远场解",对参量扬声器的一种信号处理方法——DSB(Double Side Band)法的互调失真问题进行了理论与实验研究。研究发现,DSB法除了存在幅值失真、谐波失真外,还存在互调失真,且实测互调失真较理论预测的复杂。在此基础上指出,"Berktay远场解"只能在一定程度上作为参量扬声器信号处理的理论依据,寻找更为精确的自解调理论模型是解决参量扬声器信号处理问题的根本途径。展开更多
The line-shape of catwalk of long-span suspension bridge is obtained by using the segmental catenary method to carry out the iterative calculation, where all the bearing cables are considered as one cable, and transve...The line-shape of catwalk of long-span suspension bridge is obtained by using the segmental catenary method to carry out the iterative calculation, where all the bearing cables are considered as one cable, and transversal passages and gantry are treated as nodes which divide the catwalk into several segments. The difference of line-shape and force between catwalk bearing cable and gantry bearing cable is not usually considered, but the line-shape of two kinds of cables is actually inconsistent because of the constraints from gantries. Based on the segmental catenary method, considering the different states of bearing cables （ DSB calculation method）, fine calculation is carried out. This method is applied to the design of a suspension bridge＇ s catwalk, and is compared with the traditional calculation method. It is obtained that the result is more reasonable and accurate by the coordination calculation method considering different states for two kinds of load-bearing cables, which is worth considering in the nrocess of design and optimization for catwalk.展开更多
文摘参量扬声器是近年来出现的一种新的声源。根据宽带参量阵理论的"Berktay远场解",对参量扬声器的一种信号处理方法——DSB(Double Side Band)法的互调失真问题进行了理论与实验研究。研究发现,DSB法除了存在幅值失真、谐波失真外,还存在互调失真,且实测互调失真较理论预测的复杂。在此基础上指出,"Berktay远场解"只能在一定程度上作为参量扬声器信号处理的理论依据,寻找更为精确的自解调理论模型是解决参量扬声器信号处理问题的根本途径。
文摘The line-shape of catwalk of long-span suspension bridge is obtained by using the segmental catenary method to carry out the iterative calculation, where all the bearing cables are considered as one cable, and transversal passages and gantry are treated as nodes which divide the catwalk into several segments. The difference of line-shape and force between catwalk bearing cable and gantry bearing cable is not usually considered, but the line-shape of two kinds of cables is actually inconsistent because of the constraints from gantries. Based on the segmental catenary method, considering the different states of bearing cables （ DSB calculation method）, fine calculation is carried out. This method is applied to the design of a suspension bridge＇ s catwalk, and is compared with the traditional calculation method. It is obtained that the result is more reasonable and accurate by the coordination calculation method considering different states for two kinds of load-bearing cables, which is worth considering in the nrocess of design and optimization for catwalk.
