Table 4.

Amplitudes and frequency recorded at different engine operating states (using a horizontal sensor).

Simulation	Peak Frequency 2 (F2)		Harmonic 2
	Mean	Standard deviation	Mean	Standard deviation
Optimum conditions	19.72	0.05	136.62	2.69
MAF 2.5 V	19.70	0.04	133.84	5.48
MAF 3.5 V	19.69	0.04	128.22	5.65
FRP 40.7 MPa	18.89	0.74	90.75	6
FRP 55.7 MPa	18.04	0.05	33.26	4,61
	Peak Frequency 3 (F3)		Harmonic 3
Optimum conditions	39.51	0.17	44.79	3.07
MAF 2.5 V	39.4	2.94	42.13	4.70
MAF 3.5 V	36.4	0.02	41.51	4.09
FRP 40.7 MPa	35.39	1.68	8.90	2.77
FRP 55.7 MPa	33.58	0.76	7.63	1.37