Vibration control in wind turbines to achieve desired system-level performance under single and multiple hazard loadings

2018 ◽  
Vol 25 (12) ◽  
pp. e2261 ◽  
Author(s):  
Milad Rezaee ◽  
Aly Mousaad Aly
Keyword(s):  
Vibration Control ◽  
Wind Turbines ◽  
System Level ◽  
Level Performance

scholarly journals Accelerated Controller Tuning for Wind Turbines Under Multiple Hazards

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Aly Mousaad Aly ◽  
◽  
Milad Rezaee
Keyword(s):  
Wind Turbines ◽  
Energy Production ◽  
Degrees Of Freedom ◽  
System Level ◽  
Controller Tuning ◽  
Initial Cost ◽  
Wide Range ◽  
System Nonlinearity ◽  
Complex Structural ◽  
Level Performance

During their lifecycle, wind turbines can be subjected to multiple hazard loads, such as high-intensity wind, earthquake, wave, and mechanical unbalance. Excessive vibrations, due to these loads, can have detrimental effects on energy production, structural lifecycle, and the initial cost of wind turbines. Vibration control by various means, such as passive, active, and semi-active control systems provide crucial solutions to these issues. We developed a novel control theory that enables semi-active controller tuning under the complex structural behavior and inherent system nonlinearity. The proposed theory enables the evaluation of semi-active controllers’ performance of multi-degrees-of-freedom systems, without the need for time-consuming simulations. A wide range of controllers can be tested in a fraction of a second, and their parameters can be tuned to achieve system-level performance for different optimization objectives.

scholarly journals Misalignment in Gas Foil Journal Bearings: An Experimental Study

2008 ◽  
Author(s):  
Samuel A. Howard
Keyword(s):  
Journal Bearings ◽  
System Level ◽  
Design Parameters ◽  
Foil Bearing ◽  
Alignment System ◽  
Successful Design ◽  
Shaft Alignment ◽  
Bearing Force ◽  
Management Schemes ◽  
Level Performance

As gas foil journal bearings become more prevalent in production machines, such as small gas turbine propulsion systems and microturbines, system level performance issues must be identified and quantified in order to provide for successful design practices. Several examples of system level design parameters that are not fully understood in foil bearing systems are thermal management schemes, alignment requirements, balance requirements, thrust load balancing, and others. In order to address some of these deficiencies and begin to develop guidelines, this paper presents a preliminary experimental investigation of the misalignment tolerance of gas foil journal bearing systems. Using a notional gas foil bearing supported rotor and a laser-based shaft alignment system, increasing levels of misalignment are imparted to the bearing supports while monitoring temperature at the bearing edges. The amount of misalignment that induces bearing failure is identified and compared to other conventional bearing types such as cylindrical roller bearings and angular contact ball bearings. Additionally, the dynamic response of the rotor indicates that the gas foil bearing force coefficients may be affected by misalignment.

System-Level Performance and Power Optimization for MPSoC

2015 ◽  
Vol 14 (1) ◽  
pp. 1-26 ◽  
Author(s):  
Ye-Jyun Lin ◽  
Chia-Lin Yang ◽  
Jiao-We Huang ◽  
Tay-Jyi Lin ◽  
Chih-Wen Hsueh ◽  
...  
Keyword(s):  
Power Optimization ◽  
System Level ◽  
Level Performance
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