Abstract: The statistical energy analysis (SEA) is applied to analyze the high frequency vibration characteristics of a gearbox. Number of modals of the gearbox is acquired by the Finite Element Analysis in the 1/3 octave frequency domain to define the suitable frequency range for SEA. The equivalent masses of two subsystems of gearbox are acquired by experimental measurement. The internal loss factors and coupling loss factors of the two subsystems are measured by the modified power injection method. The SEA model of the gearbox is established in software VAONE using the measured SEA parameters, and then the vibration response of random force excitation is calculated. Since the simulation solution and measured results agree well, the validity of the measurement method and the effectiveness of analysis of vibration response using SEA is proved. The vibration response of the gearbox under operation condition is analyzed using the gearbox SEA modal established in previous work. The results show that SEA method can analyze the vibration response of complex structure effectively.

Key words: vibration and wave, statistical energy analysis(SEA), equivalent mass, internal loss factor, coupling loss factor, gearbox

摘要： 应用统计能量分析方法对变速箱结构进行高频振动特性的分析。通过有限元计算得到1/3倍频程频带内的模态数目，确定适合统计能量分析的频率范围。研究复杂结构等效质量的试验方法，测量得到两个子系统的等效质量、内损耗因子和耦合损耗因子。结合测量结果，在VA One中建立统计能量分析模型，计算得到随机激励力作用下的振动响应，并与试验测量结果进行对比，验证结果表明所建模型是正确且有效的。运用所建立的变速箱SEA模型计算在实际工作激励下的振动响应。结果表明统计能量分析方法可以有效地对复杂结构的高频振动特性进行分析。

关键词: 振动与波, 统计能量法（SEA）, 等效质量, 内损耗因子, 耦合损耗因子, 变速箱