Affiliations: [a] State Key Laboratory for Strength and Vibration of
Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an,
Shaanxi, China | Université Laval, Canada | Tohoku University, Japan
Correspondence:
[*]
Corresponding author: Shilin Xie, State Key Laboratory for
Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an
Jiaotong University, Xi'an 710049, Shaanxi, China. E-mail:
[email protected]
Abstract: A new identification method for impact loads is proposed based on
the transient statistical energy analysis theory. The load identification
problems of structure subjected to single excitation are classified into three
cases according to the completeness of load location information and subsystem
response set. The input energy of impact load and the load location is firstly
identified from the averaged vibration energy responses of subsystems according
to energy balance equation for three cases. The load amplitude spectrum is
thereafter derived under the assumption of constant value of itself from the
identified input energy within each analytical frequency band. Finally, the
time history of impact load is further determined for the given load time
domain waveform using a developed fitting method. The experimental studies of
impact load identification are conducted on a plate-shell assembled structural
system. The results show that the location and input energy of impact load can
be identified with fairly accuracy using the presented identification method.
Besides, both the load spectrum and time history of impact load have good
agreements with the measured ones.
Keywords: Load identification, impact load, transient statistical energy analysis, input energy, time history
