Optimal Sensor Placement for Latticed Shell Structure Based on an Improved Particle Swarm Optimization Algorithm

Table 3

The selected main modes, effective modal mass (EM), effective modal mass participation ratio (EPMR), and cumulative effective modal mass participation ratio (CEMR) in the three directions.

𝑥 direction				𝑦 direction				𝑧 direction
Order	EM	EPMR	CEMR	Order	EM	EMPR	CEMR	Order	EM	EMPR	CEMR
1	1569.2	10.15%	10.15%	2	1569.2	10.15%	10.15%	3	1983.6	11.55%	11.55%
6	2043.4	13.22%	23.37%	7	2043.4	13.22%	23.37%	8	2800.4	16.31%	27.86%
18	781.19	5.05%	28.42%	17	781.21	5.05%	28.42%	19	10550	61.45%	89.31%
80	10056	65.06%	93.48%	81	10056	65.06%	93.48%	26	433.34	2.52%	91.83%