Abstract
In this paper, vibration control of an unbalanced single-side cantilevered rotor system using a novel integral squeeze film bearing damper in terms of stability, energy distribution, and vibration control is analyzed. A finite element model of such a system with an integral squeeze film bearing damper (ISFBD) is developed. The stability, energy distribution, and vibration control of the unbalanced single-side cantilevered rotor system are calculated and analyzed based on the finite element model. The stiffness of the integral squeeze film bearing damper is designed using theoretical calculation and finite element model (FEM) simulation. The influence of installation position and quantity of integral squeeze film bearing dampers on the vibration control of the unbalanced cantilevered rotor system is discussed. An experimental platform is developed to validate the vibration control effect. The results show that the installation position and quantity of the integral squeeze film bearing dampers have different effects on the stability, energy distribution, and vibration control of the unbalanced cantilevered rotor system. When ISFBDs are installed at both bearing housings, the vibration control is best, and the vibration components of the time and frequency domains have good vibration control effects in four working conditions.
Highlights
Single-side cantilevered rotor systems are widely used in various types of rotating machinery, such as flue gas turbines and pumps, and play important roles in the military and civil engineering fields.These systems are mainly composed of an impeller, a shaft, a bearing housing, bearings, a coupling, and a driving end [1]
When there is an unbalanced mass at the cantilevered disk, the unbalanced single-side cantilevered rotor system will strongly vibrate through the first order critical speed, and the amplitude will increase sharply, which will cause the rotor system to fail, resulting in a dangerous operation process
We explored the vibration control on the rotor system by changing the installation position and quantity of integral squeeze film bearing dampers
Summary
Single-side cantilevered rotor systems are widely used in various types of rotating machinery, such as flue gas turbines and pumps, and play important roles in the military and civil engineering fields. Bistable phenomena and lock-up phenomena occur when the rotor passes a critical speed [12]; (2) using a metal rubber damper to reduce vibration, but this has almost no damping effect at noncritical speeds [13]; (3) using friction dampers to create frictional energy between metals, but their disadvantages are weak supporting capacity and poor temperature stability, and the material cannot be restored to its original state after yielding [14] These methods described above have great limitations. The novel integral squeeze film bearing damper (ISFBD) is less common in the vibration control of an unbalanced single-side cantilevered rotor system.
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