Identification of Engine Inertia Parameters and System Dynamic Stiffness via In Situ Method

Table 5

Sensitivity of the method to system stiffness errors in response locations.

	Direction
Random error ±34.8 mm		2687089.0	−49.4	534515.0	79808.6	312370.9	−400879.0
		−460.3	272380.3	−820.9	−17882.0	−362.8	−68551.1
		538707.6	555.9	1419494.0	211825.7	141596.3	−80095.5
		80841.6	−17496.1	213273.3	55795.1	21209.0	−18439.5
		311702.6	−33.8	138302.0	20606.6	73283.5	−46386.5
		−400960.0	−68279.8	−79754.0	−18304.2	−46517.9	101827.6
		−0.3	—	−0.3	−0.76	−0.51	−0.84
		—	−1.06	—	−2.19	—	−0.79
		0.48	—	0.24	−0.28	2.11	−0.40
		0.53	−4.30	0.40	0.11	1.97	1.25
		−0.73	—	−0.26	−0.93	0.16	−1.51
		−0.82	−1.18	−0.83	0.50	−1.23	−0.50
Random error ±120 mm		2687577.0	−863.8	533317.9	80772.6	326156.1	−411843.0
		−1342.0	269013.3	955.6	−16104.3	−366.2	−79734.5
		535032.0	−4586.7	1405268.0	211346.6	177723.6	−88411.0
		81899.9	−18308.2	214197.9	61077.6	27131.7	−21016.2
		312780.1	−1596.4	135979.4	20503.2	82414.3	−48248.2
		−407703.0	−69072.3	−81083.1	−20979.8	−48705.7	113786.3
Estimated error (%)		−0.28	—	−0.52	0.44	3.88	1.87
		—	−2.28	—	−11.92	—	15.39
		−0.20	—	−0.77	−0.50	28.17	9.94
		1.84	0.14	0.84	9.59	30.44	15.40
		−0.38	—	−1.94	−1.43	12.64	2.44
		0.85	−0.04	0.83	15.20	3.42	11.18