A modification for the PSD envelope of ground microtremor considering non-stationary modification

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (24) : 179-182.

HAO Yu,CHEN Xueqian,FAN Xuanhua,WANG Yujun,DU Qiang,HU Shaoquan

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Abstract

Ground microtremor is an important factor for stability of large precise equipments.Determination of the envelope of power spectral density (PSD) is one of the preliminaries for the stability design of a structure.Combining the numerical characteristics of a ground microtremor, a modification method was proposed considering the non-stationarity of the ground mircotremor signal.The modified PSD envelope can avoid the problem that large-amplitude vibrations may be hided in the traditional stationary or locally stationary assumptions, yielding an envelope that fully reflects the most dangerous part of the ground microtremor load, which is independent to the selection of time length of a PSD curve.The PSD envelopes of the ground microntremor of the Huagai monitoring station in 2015—2016 were calculated, founding basis for the design of large opto-mechanical structures.

Key words

ground microtremor / non-stationary / power spectral density(PSD) / root mean square

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HAO Yu,CHEN Xueqian,FAN Xuanhua,WANG Yujun,DU Qiang,HU Shaoquan. A modification for the PSD envelope of ground microtremor considering non-stationary modification[J]. Journal of Vibration and Shock, 2019, 38(24): 179-182

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