Reliability Test Rig of the Motorized Spindle and Improvements on Its Ability for High-Speed and Long-Term Tests

Table 3

Parameters of the EHSLS before and after optimization.

Parameter		Value	Unit	Definition
Main parameters				Amplification coefficient
				Natural frequency of the servo valve
				Damping coefficient of the servo valve
				Flow gain of the servo valve
				Leakage coefficient of the system
				Elastic modulus of effective volume
				Oil volume in each chamber when the piston is in the middle of the cylinder
				Equivalent mass of the piston rod
				Effective action area of the piston rod
				Structural stiffness
				Damping coefficient of the piston and load
				Amplification coefficient of the feedback link
Damper parameters				Stiffness of the damper
				Damping coefficient of the damper