To develop a
rapid detection method to study the local disengagement in metro monolithic
track bed, the HilbertHuang transform (HHT) is applied to
the sensitive vibration responses obtained before and after the local disengagement
of the monolithic track bed. Subsequently, crucial information is extracted
from the transform spectrum to identify the location of local disengagement.
The results reveal the following. (1) The vertical accelerations of the
carriage, bogie, and track bed are most sensitive to the local disengagement in
the monolithic track bed. (2) By applying the HHT to the three kinds of
vertical accelerations, it is observed that it is difficult to use the HHT
spectrum of the vertical acceleration of the track bed to identify the local
disengagement of the monolithic track bed, but that of the carriage and the
bogie varies significantly near the local disengagement region. The length of
local disengagement can therefore be identified qualitatively according to the
variation of the energy amplitude of the HHT spectrum. (3) The HHT spectrum
curves of the vertical acceleration of the carriage and bogie fluctuate
significantly. Thus, the starting point of local disengagement can be
determined by considering the speed of the train and the local minimum point of
frequency curve in the HHT spectrum.
WEI Gang
,
ZHANG Yiran
,
JIANG Jiqing
,
DING Liang
,
DONG Beibei
. Identification of Local Disengagement in Metro
Monolithic Track Bed Based on HilbertHuang Transform[J]. Tunnel Construction, 2023
, 43(5)
: 754
-760
.
DOI: 10.3973/j.issn.2096-4498.2023.05.002
