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EFFICIENT AND ENHANCED OPTIONS FOR EXPERIMENTAL MODE IDENTIFICATION

机译:实验模式识别的有效和增强选项

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Modal testing, often anrnexpensive and time-consuming endeavor, isrntypically performed on a structure excited byrnone or more shakers. Two options, whichrnoffer cost savings and enhanced datarncontent are presently explored. The firstrnoption, base excitation and responsernmeasurement, permits combinedrnenvironmental vibration and modal testing ofrna structure subjected to operational levelrndynamic environments. In this situation, FRFrndata is associated with base inputrnaccelerations rather than shaker forces. Thernsecond option, ambient responsernmeasurement, permits identification ofrnmodes when excitations are unmeasured orrndifficult to characterize. This option usesrn"MI/MO" random decrement methodology tornidentify FRF data. Both options employrnadaptations of the proven SFD algorithm tornidentify modal parameters. The two optionsrnare demonstrated by analyses of actual testrndata.
机译:模态测试通常是昂贵且费时的,通常是在由激振器或更多振动器激发的结构上进行的。目前正在探索两种选择,它们可以节省成本并提高数据容量。第一种选择是基础激励和响应测量,它允许在操作水平动态环境下对环境结构进行环境振动和模态测试的组合。在这种情况下,FRFrndata与基本输入加速度相关,而不是与振动器力相关。第二种选择,即环境响应测量,允许在未测量或难以表征激励的情况下识别模式。该选项使用“ MI / MO”随机减量方法来识别FRF数据。两种选择都采用了经过验证的SFD算法来识别模态参数。通过对实际测试数据的分析证明了这两种选择。

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