A Low-Cost Wireless Multinode Vibration Monitoring System for Civil Structures

Table 2

MAC values between the mode shapes identified by each system (high-grade and low-cost systems with and without interpolation) and the mode shapes identified by the high-grade system.

System		Mode	MAC
			1st	2nd	3rd
High-grade		1st	1.0000	0.0369	0.0184
		2nd	0.0369	1.0000	0.0202
		3rd	0.0184	0.0202	1.0000
Low-cost	Raw	1st	0.0597	0.1534	0.1169
		2nd	0.1278	0.0702	0.1475
		3rd	0.2509	0.3890	0.0424
	Linear	1st	0.1548	0.1315	0.0046
		2nd	0.7768	0.2393	0.0117
		3rd	0.0222	0.0623	0.6800
	Spline	1st	0.4339	0.0529	0.0462
		2nd	0.0769	0.3399	0.0658
		3rd	0.0414	0.0411	0.9838
	MAkima	1st	0.4335	0.0530	0.0463
		2nd	0.0776	0.3305	0.0653
		3rd	0.0393	0.0428	0.9848
	NUFFT	1st	0.4356	0.0523	0.0476
		2nd	0.0555	0.3660	0.0607
		3rd	0.0976	0.0083	0.9206