研究目的
This study aims to present the feasibility of a controllable GFB (C-GFB) with piezoelectric actuators modifying the fluid film thickness profile to improve the rotordynamic performance and to implement various changes in the bearing geometry.
研究成果
The study concludes that GFBs are required to be designed depending on the system requirements, applications, and environments. However, C-GFBs can easily change the bearing shape through input voltage controls of the piezoelectric material, so that one bearing can be applied to various applications. Furthermore, C-GFBs can control rotor-bearing systems in real time to have stable operations under various operating conditions.
研究不足
The study did not consider the thermal effects of fluid-film temperature on the bearing performance but focused on the feasibility of the C-GFB from the view point of dynamics. The utilization of C-GFBs is accompanied by additional cost and system complexity.
1：Experimental Design and Method Selection:
The study proposes a new concept of controllable gas foil bearings (C-GFBs) with piezoelectric actuators. The C-GFB consists of a laminated top foil, bump foil, and piezo stacks and can change the bearing shape or film thickness locally and globally by varying the thickness of the piezo stacks with input voltages. The control schemes include clearance control and preload control.
2：Sample Selection and Data Sources:
The study uses a rotor supported on two journal C-GFBs for rotordynamic performance prediction. The rotor has a length of 244 mm, diameter of 40 mm, and weight of 19.6 N.
3：6 N.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The C-GFB includes piezoelectric actuators, top foil, bump foil, and bottom foil made of Inconel X-750. Piezoelectric material of PMN-33%PT is used for the piezo stacks.
4：Piezoelectric material of PMN-33%PT is used for the piezo stacks.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The study involves predicting the bearing lubrication performance for four cases of C-GFBs with different bearing clearances and preloads. The rotordynamic performance of a rotor supported on two journal C-GFBs is predicted.
5：Data Analysis Methods:
The study uses a bearing lubrication model based on a compressible isothermal Reynolds equation for evaluating the effects of piezo stack control on bearing performance. The dynamic stiffness and damping coefficients are determined by the integration of the perturbed pressure on the bearing surface.
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