Surrogate-Based Multisource Sensitivity Analysis of TBM Driving System

Table 4

Input parameters and their variation ranges.

Type	Name	Code	Initial Value	Lower Bound	Upper Bound
External Conditions	Rotating speed (r/min)	x1	5.6	5.3	5.9
	Torque (kNm)	x2	2280	1000	2500
	Thrust (kN)	x3	1.4e4	1.2e4	1.5e4
Material Properties	Damping Ratio of Steel	x4	1e-3	2e-4	5e-3
	Elasticity Modulus (GPa)	x5	210	200	220
	Poisson Ratio	x6	0.3	0.29	0.31
Meshing Parameters	Backlash (μm)	x7	300	100	500
	Meshing Error (μm)	x8	- -	-20%	+20%
	Mean Meshing Stiffness (N/m)	x9	8.1e9	7.5e9	8.5e9
	Damping Ratio of Gear Mesh	x10	0.05	0.03	0.17
Connection Parameters	Damping Ratio of Rock	x11	1e-3	2e-4	5e-3
	Damping Ratio of Bolt	x12	1e-3	2e-4	5e-3
	Damping Ratio of Bearing	x13	1e-3	2e-4	5e-3
	Damping Ratio of Spline	x14	1e-3	2e-4	5e-3
	Damping Ratio of Hydraulic	x15	1e-3	2e-4	5e-3
	Stiffness of Cutterhead-Rock	x16	- -	1/2	2
	Stiffness of Girder-Rock	x17	- -	1/2	2
	Stiffness of Cutterhead-Flange	x18	- -	1/2	2
	Stiffness of Flange-Bearing	x19	- -	1/2	2
	Stiffness of Bearing-Carrier	x20	- -	1/2	2
	Stiffness of Carrier-Girder	x21	- -	1/2	2
	Stiffness of Main Bearing	x22	- -	1/2	2
	Stiffness of Pinion-Bearing	x23	- -	1/2	2
	Stiffness of Pinion-Gearbox	x24	- -	1/2	2
	Stiffness of Hydraulic	x25	- -	1/2	2