Primary response of static coil vibration system of loudspeakers Subjected to Narrow-Band Random Excitation
YANG Zhi-an1, WANG Shuai2
1. Key Laboratory of Structure and Vibration engineering of Tangshan and Tangshan college, Tangshan 063000；
2.North China University of Technology 063000
Abstract：Dynamics model of static coil vibration system of loudspeakers is established based on Lagrange-Maxwell equation. By means of the method of multiple scales to the static coil vibration system of loudspeakers subjected to narrow-band random excitation, the first approximation solution and corresponding to the steady state solution and Ito stochastic differential equation have been obtained. Using moment method the mean-square response equation of the system is derived and numerical analysis is carried out. The influence of the parameters of the static coil vibration system of loudspeakers on the primary resonance response curves and mean-square values have been analyzed. The sufficient and necessary condition for the stability of the primary resonance is the same as the first order moment and the second order moment stability of the system. With the increase of the random disturbance intensity, the limit cycle becomes limit cycle of diffusion and the width increases. Increasing the length of the coil and the magnetic field strength can increase the average value and resonance region of the primary resonance of the system. The mean-square value and the resonance region of the primary resonance can be reduced by increasing the resistance and damping coefficient of the system.
杨志安 1,王帅 2. 有界窄带激励下扬声器静圈振动系统的主共振[J]. 振动与冲击, 2016, 35(23): 51-55.
YANG Zhi-an1, WANG Shuai2. Primary response of static coil vibration system of loudspeakers Subjected to Narrow-Band Random Excitation. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(23): 51-55.
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