*2.3. Experimental Process*

Single point and multi-point excitation (synchronous/step-by-step) were used in the experiment, and the specific excitation steps were as follows:

(1) the action point (1~9#) was excited respectively; (2) two action points were executed synchronously or step-by-step as follows: 1# and 2#, 1# and 5#, 2# and 4# (excitation stepby-step), 6# and 7#, 6# and 8#, 7# and 8#, 8# and 9#; (3) four action points (6~9#) and five action points (1~5#) were excited synchronously and respectively.

Before the experiment, the data acquisition instrument needed to be zeroed first, and when the impact actions caused by the excitation were balanced, the data acquisition would be terminated and saved.
