Experimental Validation of Numerical Model for Bi-Tilt-Isolator

Table 1

Root mean square error of different initial displacement and lubrication conditions with optimal parameters of friction force.

Initial displacement	WD40 sprayed, m	WD40 whipped, m	W/O lubrication, m
0.05 m; (0.048~0.059 m)	0.00028	0.00021	0.00029
	0.00041	0.00033	0.00079
	0.00156	0.00225	0.00453
	0.47%	0.44%	0.54%
0.10 mm; (0.097~0.107 m)	0.00055	0.00046	0.00034
	0.00056	0.00082	0.00094
	0.00182	0.00438	0.00649
	0.51%	0.47%	0.32%
0.15 mm; (0.152~0.155 m)	0.00206	0.00057	0.00061
	0.00206	0.00057	0.00061
	0.00229	0.00829	0.00874
	1.35%	0.37%	0.40%

There is slight difference for actual initial displacement in the process of test; the optimization solution with cubic polynomial of friction; the error of the optimum parameters for using the maximum initial displacement simulation; simulation errors with constant friction; the ratio of error of the optimum solutions and initial displacement.