More electric aircraft initiative has led to Fly-By-Wire (FBW) and Power-By-Wire (PBW) technologi... more More electric aircraft initiative has led to Fly-By-Wire (FBW) and Power-By-Wire (PBW) technologies. PBW technology has several advantages and has potential for weight reduction and energy saving compared to conventional hydraulic system. Recent development in aviation technology have combined the electric and hydraulic system and arrived at high performance Electro Hydrostatic Actuator (EHA) system. It is a one of the PBW technology which aims at replacing the centralized hydraulic system by a local self-contained and compact actuator system. It is an emerging technology which combines the benefits of conventional hydraulic system and direct drive actuators, like the high energy efficiency, high dynamic response, high torque to mass ratio and high maintainability. EHA system was initially introduced in aircraft for flight control system. Most of the current research literatures considered the EHA system with symmetric actuator configuration. This is because, most of the aircraft application uses symmetric cylinder. However in case of industrial application, asymmetric actuators are predominantly used. An indigenous experimental setup of EHA system with asymmetric actuator has been developed with sensors and instrumentation. In this paper, the dynamic analysis, position tracking and control of the EHA system by varying the speed of drive motor has been established using a Proportional Integral Derivative (PID) controller. PID tuning has been done using Ziegler Nichols (ZN) method. The response using of Proportional Integral (PI), Proportional Derivative (PD) and PID controllers has been studied and found that the PD controller gives the best response.
CIRP Journal of Manufacturing Science and Technology, 2018
The current research work proposes a novel approach to produce holes with high degree of cylindri... more The current research work proposes a novel approach to produce holes with high degree of cylindricity on brittle materials using Micro-Abrasive Jet Machining (m-AJM) technique. Cylindrical micro holes are used as fluid reservoir in microfluidics application such as lab on chip and organ on chip systems. The shape of the holes produced using m-AJM is observed to be conical due to its tapered sidewalls. It is difficult to achieve cylindrical holes through the m-AJM process at present. The novel approach presents a hypothesis that by maintaining nozzle stand-off distance (NSD) constant during machining to a value set at the beginning of machining, the taper angle of the holes can be reduced resulting in holes with higher degree of cylindricity. Geometrical characteristics of the machined holes such as their dimension and form error have been examined using coordinate measuring machine (CMM). The obtained results showed significant reduction of 56% in the taper angle and improvement of 57% in the cylindricity of machined holes.
Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compact actuato... more Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compact actuator system. It is gaining more attention due to its compactness and reliability. The control method should be appropriate to achieve accurate position control and stability. The EHA system model is developed in AMESim software and Proportional-Integral-Derivative (PID) control is used for position tracking of the cylinder. Design Exploration facility of AMESim software provides a platform to optimize PID parameters using Genetic Algorithm (GA). Simulation results show that position tracking with no overshoot and less settling time.
ABSTRACT Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compac... more ABSTRACT Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compact actuator system. It is gaining more attention due to its compactness and reliability. The control method should be appropriate to achieve accurate position control and stability. The EHA system model is developed in AMESim software and Proportional-Integral-Derivative (PID) control is used for position tracking of the cylinder. Design Exploration facility of AMESim software provides a platform to optimize PID parameters using Genetic Algorithm (GA). Simulation results show that position tracking with no overshoot and less settling time.
Flapper-nozzle type Electro Hydraulic Servo Valve (EHSV) operated by conventional torque motor ac... more Flapper-nozzle type Electro Hydraulic Servo Valve (EHSV) operated by conventional torque motor actuators has been used in wide range of industrial applications. As their bandwidths are limited, they are not suitable for high-speed applications. The work presented in this paper deals with the mechatronic approach for the design of a magnetostrictive actuator with flexure amplifier and a magnetically biased magnetostrictive actuator for application in high frequency flapper-nozzle servo valve. A magnetostrictive actuator has been designed, built and integrated into an existing flapper-nozzle servo valve by replacing the torque motor. Incorporating the dynamics of the magnetostrictive actuator, the dynamics of the valve was simulated. Necessary parameters for the actuator have been arrived by finite element model. No load flow characteristics are analyzed and compared with experimental values.
More electric aircraft initiative has led to Fly-By-Wire (FBW) and Power-By-Wire (PBW) technologi... more More electric aircraft initiative has led to Fly-By-Wire (FBW) and Power-By-Wire (PBW) technologies. PBW technology has several advantages and has potential for weight reduction and energy saving compared to conventional hydraulic system. Recent development in aviation technology have combined the electric and hydraulic system and arrived at high performance Electro Hydrostatic Actuator (EHA) system. It is a one of the PBW technology which aims at replacing the centralized hydraulic system by a local self-contained and compact actuator system. It is an emerging technology which combines the benefits of conventional hydraulic system and direct drive actuators, like the high energy efficiency, high dynamic response, high torque to mass ratio and high maintainability. EHA system was initially introduced in aircraft for flight control system. Most of the current research literatures considered the EHA system with symmetric actuator configuration. This is because, most of the aircraft application uses symmetric cylinder. However in case of industrial application, asymmetric actuators are predominantly used. An indigenous experimental setup of EHA system with asymmetric actuator has been developed with sensors and instrumentation. In this paper, the dynamic analysis, position tracking and control of the EHA system by varying the speed of drive motor has been established using a Proportional Integral Derivative (PID) controller. PID tuning has been done using Ziegler Nichols (ZN) method. The response using of Proportional Integral (PI), Proportional Derivative (PD) and PID controllers has been studied and found that the PD controller gives the best response.
CIRP Journal of Manufacturing Science and Technology, 2018
The current research work proposes a novel approach to produce holes with high degree of cylindri... more The current research work proposes a novel approach to produce holes with high degree of cylindricity on brittle materials using Micro-Abrasive Jet Machining (m-AJM) technique. Cylindrical micro holes are used as fluid reservoir in microfluidics application such as lab on chip and organ on chip systems. The shape of the holes produced using m-AJM is observed to be conical due to its tapered sidewalls. It is difficult to achieve cylindrical holes through the m-AJM process at present. The novel approach presents a hypothesis that by maintaining nozzle stand-off distance (NSD) constant during machining to a value set at the beginning of machining, the taper angle of the holes can be reduced resulting in holes with higher degree of cylindricity. Geometrical characteristics of the machined holes such as their dimension and form error have been examined using coordinate measuring machine (CMM). The obtained results showed significant reduction of 56% in the taper angle and improvement of 57% in the cylindricity of machined holes.
Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compact actuato... more Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compact actuator system. It is gaining more attention due to its compactness and reliability. The control method should be appropriate to achieve accurate position control and stability. The EHA system model is developed in AMESim software and Proportional-Integral-Derivative (PID) control is used for position tracking of the cylinder. Design Exploration facility of AMESim software provides a platform to optimize PID parameters using Genetic Algorithm (GA). Simulation results show that position tracking with no overshoot and less settling time.
ABSTRACT Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compac... more ABSTRACT Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compact actuator system. It is gaining more attention due to its compactness and reliability. The control method should be appropriate to achieve accurate position control and stability. The EHA system model is developed in AMESim software and Proportional-Integral-Derivative (PID) control is used for position tracking of the cylinder. Design Exploration facility of AMESim software provides a platform to optimize PID parameters using Genetic Algorithm (GA). Simulation results show that position tracking with no overshoot and less settling time.
Flapper-nozzle type Electro Hydraulic Servo Valve (EHSV) operated by conventional torque motor ac... more Flapper-nozzle type Electro Hydraulic Servo Valve (EHSV) operated by conventional torque motor actuators has been used in wide range of industrial applications. As their bandwidths are limited, they are not suitable for high-speed applications. The work presented in this paper deals with the mechatronic approach for the design of a magnetostrictive actuator with flexure amplifier and a magnetically biased magnetostrictive actuator for application in high frequency flapper-nozzle servo valve. A magnetostrictive actuator has been designed, built and integrated into an existing flapper-nozzle servo valve by replacing the torque motor. Incorporating the dynamics of the magnetostrictive actuator, the dynamics of the valve was simulated. Necessary parameters for the actuator have been arrived by finite element model. No load flow characteristics are analyzed and compared with experimental values.
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Papers by S. Karunanidhi