瞬态统计能量分析法中动态响应误差分析

Analysis on dynamic response error in transient

统计能量分析方法能够有效预示舰船和车辆等结构的高频振动及噪声。本文通过建立两子结构耦合模型,利用差分法研究了瞬态统计能量分析中参数误差对子结构响应能量的影响,同时给出了参数误差与所导致能量误差的关系函数。结果表明:对于外载荷直接激励的子结构,内损耗因子和耦合损耗因子的误差都会导致被预示总能量的减小。对于外载荷间接激励的子结构,内损耗因子的误差会导致峰值能量的减小,而耦合损耗因子的误差会导致峰值能量的增加。本文内容对改进动力学系统数值模型以及提高结构振动和噪声预示精度有一定的帮助。

Statistical energy analysis （SEA） method has been recognized as a powerful tool in predicting the high-frequency sound and vibration of ship structures and vehicles. In the transient statistical energy analysis framework, this paper applies the difference method to investigate the effect of parameters error on structural total energy. Meanwhile, the function relation of parameters error and caused energy error is also provided. The following results can finally be shown. For the subsystem that is directly excited by an external load, the error of the damping loss factors and coupling loss factors will result in the decrease of structural total energy. For the subsystem that is indirectly excited, the error of damping loss factors can lead to the decreasing of structural peak energy, while the error of coupling loss factors will result in the increase of structural peak energy. The content of this paper can provide some help for improving the dynamics model and predicted accuracy of sound and vibration.