Research on Sound Source Material Recognition Technology in Indoor Geotechnical Inspection

Table 4

Correlation table between the same level of hammering force and different compaction of soil samples and the subband spectrum centroid mean value.

Serial number	Hammering force (N)	Soil compaction (%)	Correlation equation	Correlation coefficient	Subband spectrum centroid mean (Hz)
1	35(L) N	76.6~ 97.9		0.79	1987~2883
2	45(L) N	76.6~100		0.96	1937~2713
3	55(L) N	76.6~100		0.96	1948~2783
4	65(L) N	80.3~100		0.97	1877~2697
5	75(L) N	83.5~100		0.94	2118~2790
6	85(L) N	87.2~100		0.67	2397~2808