Fault Detection of In-Service Bridge Expansion Joint Based on Voiceprint Recognition

Table 7

Fine-grained vehicle types of impact events.

Vehicle impact audio type	Training set	Test set	Total	Signal statistics (mean) (ms)	Signal statistics (standard deviation) (ms)
Car	2412	603	3015	276.0	56.1
Bus	118	29	147	449.2	100.4
Van	442	111	553	375.6	63.9
Truck	326	82	408	721.3	333.7
Total	3298	825	4123	390.9	260.6