Performance enhancement of wind turbine systems with vibration control: A review
Content :
Damping by different method
Content :
Damping by different method
Passive control
A conventional vibration control technique, consisting of springs and dampers only, is referred as passive control device. (PED – passive energy decapitation)
A conventional vibration control technique, consisting of springs and dampers only, is referred as passive control device. (PED – passive energy decapitation)
Active control
The active control system provides enhanced structural behavior of a system and it consists of force delivery devices, real-time data processors and sensors. Sensors sense the vibration and control actuators apply necessary torque (force) to control the vibration of the structure
Semi Active Control
Compared to the passive control method where the Control forces are developed from the motion of the structure itself, appropriate adjustable mechanical devices are used to Provide control forces for semi-active method. Semi-active Approach has become attractive for structural vibration control applications due to controllable damping and low power requirement for operating damping devices.
The active control system provides enhanced structural behavior of a system and it consists of force delivery devices, real-time data processors and sensors. Sensors sense the vibration and control actuators apply necessary torque (force) to control the vibration of the structure
Semi Active Control
Compared to the passive control method where the Control forces are developed from the motion of the structure itself, appropriate adjustable mechanical devices are used to Provide control forces for semi-active method. Semi-active Approach has become attractive for structural vibration control applications due to controllable damping and low power requirement for operating damping devices.
Tuned Mass Dampers
TMD consists of a secondary mass placed top of the primary structure with spring and damping elements. It provides a frequency-dependent hysteresis characteristic that increases damping in the main structure.
TMD consists of a secondary mass placed top of the primary structure with spring and damping elements. It provides a frequency-dependent hysteresis characteristic that increases damping in the main structure.
Tuned Liquid Damper
Among different types of TLD,Tuned Liquid Column Damper(TLCD) is the most feasible and efficient damper to solve vibration problem due to high excitation force. A TLCD is generally modelled as U-shaped tube which is partially filled with a volume of liquid and attached to the top of the structure it acts as a mass of the damper. Other than u shape rectangular shape cross tube like containers are also proposed. Different types of tlds and their applications in structural vibrations are studied. TLCD can control 55% of vibration in wind turbine.
Among different types of TLD,Tuned Liquid Column Damper(TLCD) is the most feasible and efficient damper to solve vibration problem due to high excitation force. A TLCD is generally modelled as U-shaped tube which is partially filled with a volume of liquid and attached to the top of the structure it acts as a mass of the damper. Other than u shape rectangular shape cross tube like containers are also proposed. Different types of tlds and their applications in structural vibrations are studied. TLCD can control 55% of vibration in wind turbine.
Controllable fluid dampers
Controllable fluid damper is a class of semi-active devices which uses controllable fluids inside the damper. Electrorheological (ER)and Magnetorheological(MR) fluid dampers are the two most commonly implemented controllable semi-active devices for structural vibration control. These types of dampers are very reliable because they contain no moving parts except piston. Controllable fluids of ER/Mr damper have the ability to change from free-flowing state to semisolid state when it comes to an electric (ER)or magnetic(MR) field. MR fluid was also implemented to design semi-active TLCD in [99] to overcome the shortcoming of passive system and to enhance their liability of the system. MR fluid was used in this study to design controllable valve for semi-active TLCD
Controllable fluid damper is a class of semi-active devices which uses controllable fluids inside the damper. Electrorheological (ER)and Magnetorheological(MR) fluid dampers are the two most commonly implemented controllable semi-active devices for structural vibration control. These types of dampers are very reliable because they contain no moving parts except piston. Controllable fluids of ER/Mr damper have the ability to change from free-flowing state to semisolid state when it comes to an electric (ER)or magnetic(MR) field. MR fluid was also implemented to design semi-active TLCD in [99] to overcome the shortcoming of passive system and to enhance their liability of the system. MR fluid was used in this study to design controllable valve for semi-active TLCD
Ball vibration absorber (BVA)
The BVA consists of a steel ball, an arc path and two steel plates which prevent the ball slides aside. When the base structure is excited, the ball rolls along the arc path and thus counters the excitation force by absorbing energy. Experimental result found that vibration response has been reduced to 39%of the displacement with the use of BVA
The BVA consists of a steel ball, an arc path and two steel plates which prevent the ball slides aside. When the base structure is excited, the ball rolls along the arc path and thus counters the excitation force by absorbing energy. Experimental result found that vibration response has been reduced to 39%of the displacement with the use of BVA
Spirical TLD
The spherical TLD consists of two layers of hemispherical shape containers which are partially filled with water. The radius of spherical containers is determined by itsFrequency and the mass of the sloshing water. The dynamic responses were reduced significantly using shake table test for different excitation loads
The spherical TLD consists of two layers of hemispherical shape containers which are partially filled with water. The radius of spherical containers is determined by itsFrequency and the mass of the sloshing water. The dynamic responses were reduced significantly using shake table test for different excitation loads
System controllers
System controllers are designed to improve the response of the system based on desired output.
System controllers are designed to improve the response of the system based on desired output.
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