We study in this paper the path properties of the Brownian motion and super-Brownian motion on the fractal structure-the Sierpinski gasket. At first some results about the limiting behaviour of its increments are obta...We study in this paper the path properties of the Brownian motion and super-Brownian motion on the fractal structure-the Sierpinski gasket. At first some results about the limiting behaviour of its increments are obtained and a kind of law of iterated logarithm is proved. Then A Lower bound of the spreading speed of its corresponding super-Brownian motion is obtained.展开更多
The action between bridge and ballasted jointless turnout on bridge is reversible. To locate the force path between them,the model of a jointless turnout on a 4×32 m continuous beam were calculated and analyzed. ...The action between bridge and ballasted jointless turnout on bridge is reversible. To locate the force path between them,the model of a jointless turnout on a 4×32 m continuous beam were calculated and analyzed. Also analyzed were factors of influence,such as：temperature increment,longitudinal pier stiffness,ballast resistances,and turnout and bridge layouts.展开更多
汽车空调系统是引起车内异响的主要原因之一,针对某款SUV汽车在开启空调后车内出现明显"呜呜"异响声的现象,应用传递路径分析和增量分析相结合方法进行快速诊断。在实车上进行噪声测试分析,运用频谱分析法和声学互动滤波技术...汽车空调系统是引起车内异响的主要原因之一,针对某款SUV汽车在开启空调后车内出现明显"呜呜"异响声的现象,应用传递路径分析和增量分析相结合方法进行快速诊断。在实车上进行噪声测试分析,运用频谱分析法和声学互动滤波技术确定引起车内异响主要激励源为空调系统的压缩机;结合对异响传递路径和增量综合分析,快速确定车内异响主要辐射源为膨胀阀和蒸发器,并采取减振降噪措施,有效降低了车内所存在的异响,降噪效果达2.5 d B(A)。展开更多
文摘We study in this paper the path properties of the Brownian motion and super-Brownian motion on the fractal structure-the Sierpinski gasket. At first some results about the limiting behaviour of its increments are obtained and a kind of law of iterated logarithm is proved. Then A Lower bound of the spreading speed of its corresponding super-Brownian motion is obtained.
文摘The action between bridge and ballasted jointless turnout on bridge is reversible. To locate the force path between them,the model of a jointless turnout on a 4×32 m continuous beam were calculated and analyzed. Also analyzed were factors of influence,such as：temperature increment,longitudinal pier stiffness,ballast resistances,and turnout and bridge layouts.
文摘汽车空调系统是引起车内异响的主要原因之一,针对某款SUV汽车在开启空调后车内出现明显"呜呜"异响声的现象,应用传递路径分析和增量分析相结合方法进行快速诊断。在实车上进行噪声测试分析,运用频谱分析法和声学互动滤波技术确定引起车内异响主要激励源为空调系统的压缩机;结合对异响传递路径和增量综合分析,快速确定车内异响主要辐射源为膨胀阀和蒸发器,并采取减振降噪措施,有效降低了车内所存在的异响,降噪效果达2.5 d B(A)。
