Active Vibration Control (Part - 2) Civil Engineering (CE) Notes | EduRev

Civil Engineering (CE) : Active Vibration Control (Part - 2) Civil Engineering (CE) Notes | EduRev

 Page 1


 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
  
Occasionally, if the nature of the disturbance is known then a feed-forward technique is adopted as
shown here.
Figure: Feed forward block diagram
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 2


 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
  
Occasionally, if the nature of the disturbance is known then a feed-forward technique is adopted as
shown here.
Figure: Feed forward block diagram
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Introduction to Active Vibration Cpntrol
 
Special cases: Shunting of mechanical energy to electrical energy
This involves transformation of vibrational energy by the piezoelectric material and designing a suitable
electrical network to dissipate this energy.
Figure: Equivalent electrical circuit
The piezoelectric patch is represented as a capacitor and a voltage source in series
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 3


 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
  
Occasionally, if the nature of the disturbance is known then a feed-forward technique is adopted as
shown here.
Figure: Feed forward block diagram
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Introduction to Active Vibration Cpntrol
 
Special cases: Shunting of mechanical energy to electrical energy
This involves transformation of vibrational energy by the piezoelectric material and designing a suitable
electrical network to dissipate this energy.
Figure: Equivalent electrical circuit
The piezoelectric patch is represented as a capacitor and a voltage source in series
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
 
Implementation of Controller: Inertial Actuator (Electro-mechanical System)
Figure: Inertial actuation system
With the advent of new technologies, actuators and sensors are getting miniaturized and integrated to
the structure. Thus, there is a transition from traditional active control to smart structure based active
control. A case study of helicopter rotor vibration control will illustrate this.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 4


 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
  
Occasionally, if the nature of the disturbance is known then a feed-forward technique is adopted as
shown here.
Figure: Feed forward block diagram
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Introduction to Active Vibration Cpntrol
 
Special cases: Shunting of mechanical energy to electrical energy
This involves transformation of vibrational energy by the piezoelectric material and designing a suitable
electrical network to dissipate this energy.
Figure: Equivalent electrical circuit
The piezoelectric patch is represented as a capacitor and a voltage source in series
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
 
Implementation of Controller: Inertial Actuator (Electro-mechanical System)
Figure: Inertial actuation system
With the advent of new technologies, actuators and sensors are getting miniaturized and integrated to
the structure. Thus, there is a transition from traditional active control to smart structure based active
control. A case study of helicopter rotor vibration control will illustrate this.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
 
Electro-Hydraulic Actuator
Figure: Traditional Active control with Hydraulic Actuator 
Figure: The Hydraulic Actuator
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 5


 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
  
Occasionally, if the nature of the disturbance is known then a feed-forward technique is adopted as
shown here.
Figure: Feed forward block diagram
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Introduction to Active Vibration Cpntrol
 
Special cases: Shunting of mechanical energy to electrical energy
This involves transformation of vibrational energy by the piezoelectric material and designing a suitable
electrical network to dissipate this energy.
Figure: Equivalent electrical circuit
The piezoelectric patch is represented as a capacitor and a voltage source in series
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
 
Implementation of Controller: Inertial Actuator (Electro-mechanical System)
Figure: Inertial actuation system
With the advent of new technologies, actuators and sensors are getting miniaturized and integrated to
the structure. Thus, there is a transition from traditional active control to smart structure based active
control. A case study of helicopter rotor vibration control will illustrate this.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
 
Electro-Hydraulic Actuator
Figure: Traditional Active control with Hydraulic Actuator 
Figure: The Hydraulic Actuator
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Module 1: Overview of Vibration Control
 Lecture 3: Active Vibration Cpntrol
 
Smart Structural Control
Figure: Smart structural control
Traditional active control can essentially control a finite number of vibrating modes of a continuous
system. This may create instability due to the unwanted excitation of the higher modes. Smart structural
control, on the other hand, is distributed in nature. It consumes less energy, gurantees stability and
could be integrated easily to the vibrating body. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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