The Doppler effect is a phenomenon of intrinsic kinematic character. This paper analyzes the kinematic Doppler effect for the case where the source is moving and the observer is at rest in the classical limit. The par...The Doppler effect is a phenomenon of intrinsic kinematic character. This paper analyzes the kinematic Doppler effect for the case where the source is moving and the observer is at rest in the classical limit. The particle nature properties of radiation are considered and how it affects the dynamics of the Source has been studied. The dynamical and kinematical equations have been derived by considering this effect. It has been conclusively shown that a moving light-emitting source experiences a finite recoil momentum in the direction opposite to the direction of motion and come to rest in finite time.展开更多
噪声模型是噪声研究的基础,目前建立的车辆行驶噪声模型中,往往忽略了多普勒效应的影响。在多普勒频移理论基础上,建立了多普勒效应单车行驶噪声模型,并对车辆行驶噪声的多普勒效应影响因素进行了分析。研究结果表明:多普勒频移现象引...噪声模型是噪声研究的基础,目前建立的车辆行驶噪声模型中,往往忽略了多普勒效应的影响。在多普勒频移理论基础上,建立了多普勒效应单车行驶噪声模型,并对车辆行驶噪声的多普勒效应影响因素进行了分析。研究结果表明:多普勒频移现象引起的受声点声压级和A计权频率响应的变化,是导致车辆迎面驶来和背离驶去时受声点噪声声压级差异的主要因素;多普勒效应对高速小型车辆行驶噪声有较显著的影响,算例中小型车以120 km/h匀速驶来时比驶去时噪声声压级(A)大2.3 d B;车辆行驶速度越高,多普勒效应对行驶噪声声压级变化的影响越明显。展开更多
文摘The Doppler effect is a phenomenon of intrinsic kinematic character. This paper analyzes the kinematic Doppler effect for the case where the source is moving and the observer is at rest in the classical limit. The particle nature properties of radiation are considered and how it affects the dynamics of the Source has been studied. The dynamical and kinematical equations have been derived by considering this effect. It has been conclusively shown that a moving light-emitting source experiences a finite recoil momentum in the direction opposite to the direction of motion and come to rest in finite time.
文摘噪声模型是噪声研究的基础,目前建立的车辆行驶噪声模型中,往往忽略了多普勒效应的影响。在多普勒频移理论基础上,建立了多普勒效应单车行驶噪声模型,并对车辆行驶噪声的多普勒效应影响因素进行了分析。研究结果表明:多普勒频移现象引起的受声点声压级和A计权频率响应的变化,是导致车辆迎面驶来和背离驶去时受声点噪声声压级差异的主要因素;多普勒效应对高速小型车辆行驶噪声有较显著的影响,算例中小型车以120 km/h匀速驶来时比驶去时噪声声压级(A)大2.3 d B;车辆行驶速度越高,多普勒效应对行驶噪声声压级变化的影响越明显。