The Experts below are selected from a list of 2790 Experts worldwide ranked by ideXlab platform
J. R. Lee - One of the best experts on this subject based on the ideXlab platform.
-
Development of wireless Laser blade deflection monitoring system for mobile wind turbine management host
Journal of Intelligent Material Systems and Structures, 2014Co-Authors: Pratyush Giri, J. R. LeeAbstract:This study proposes a wireless Laser Displacement Sensor system for in\nsitu deflection monitoring of wind turbine blades. This system consists\nof a tower-installed Laser Displacement Sensor system composed of a\nLaser Displacement Sensor head, controller, Zigbee transmitter, and\nanalog-to-digital converter module, combined with a mobile host that\nincludes a Zigbee receiver and a laptop. In contrast to the approach of\nblade Sensor installation, the Laser Displacement Sensor system is\ninstalled in the tower to enable noncontact blade Displacement\nmonitoring. The concepts of direct noncontact remote sensing and\nactuation from the tower and remote power delivery from the tower to\nblade-installed Sensors and actuators will enable various approaches for\nwind turbine structural health monitoring. The proposed system can\neasily identify problems related to deflection. The size of wind blades\nincreases with energy demands. Due to the large size of wind turbines,\ncurrent wind turbines are installed very high above ground level. It is\nimpractical to monitor the results from Laser Displacement Sensor\nthrough wired connection in these cases. Hence, wired connections of\nLaser Displacement Sensors to base monitoring stations must be replaced\nwith a wireless solution. This wireless solution is achieved using\nZigbee technology. The output from the Laser Displacement Sensor is fed\nto a microcontroller, which acts as an analog-to-digital converter. The\noutput from the microcontroller is connected to the Zigbee transceiver\nmodule, which transmits the data, and at the other end, the Zigbee reads\nthe data and displays it on a PC, from which users can monitor the\ncondition of the wind blades.
-
Feasibility of in situ blade deflection monitoring of a wind turbine using a Laser Displacement Sensor within the tower
Smart Materials and Structures, 2013Co-Authors: J. R. Lee, Hyeong-Cheol KimAbstract:With the potential of commercially viable global wind power, the use of wind energy is expected to\r rise further, along with related problems. One issue is collision of the wind turbine blades with\r the tower during operation. Structural health monitoring is required to improve operational safety,\r minimize the risk of sudden failure or total breakdown, ensure reliable power generation, and reduce\r wind turbine life cycle costs. To this end, large numbers of Sensors such as fiber Bragg grating and\r piezoelectric devices have been attached to the structure, which is uneconomical and impractical for\r large wind turbines. This study proposes a single Laser Displacement Sensor (LDS) system in which\r all of the rotating blades can be cost-effectively evaluated. In contrast to the approach of blade\r Sensor installation, the LDS system is installed in the tower to enable noncontact blade\r Displacement monitoring. The concept of a noncontact Sensor and actuator and their energy delivery\r device installed in the tower will enable various approaches for wind turbine structural health\r monitoring. Blade bolt loosening can cause deflection in an affected blade. Similarly, nacelle tilt\r or mass loss damage in a blade can result in changes in blade deflection, but the proposed system\r can detect such problems early on.
-
In-situ Blade Deflection Monitoring of a Wind Turbine using a Wireless Laser Displacement Sensor Device within the Tower
Structural Health Monitoring: Research and Applications, 2013Co-Authors: Pratyush Giri, J. R. Lee, W. K. Chiu, Stephen C. GaleaAbstract:With commercially viable global wind power potential, wind energy penetration is further expected to rise, as will the related problems. One issue is the collision of wind turbine blades with the tower during operation. Structured health monitoring is required to improve operational safety, minimize the risk of sudden failure or total breakdown, ensure reliable power generation, and reduce wind turbine life cycle costs. Large numbers of Sensors such as fiber Bragg grating and piezoelectric devices have been attached to the structure, a design that is uneconomical and impractical for use in large wind turbines. This study proposes a single Laser Displacement Sensor ({LDS)} system in which all of the rotating blades could be cost-effectively evaluated. Contrary to the approach of blade Sensor installation, the {LDS} system is installed in the tower to enable noncontact blade Displacement monitoring. The concept of a noncontact Sensor and actuator and their energy delivery device installation in the tower will enable various approaches for wind turbine structural health monitoring. Blade bolt loosening causes deflection in the affected blade. Similarly, nacelle tilt or mass loss damage in the blade will result in changes in blade deflection, but the proposed system can identify such problems with ease. With the need of more energy, the sizes of wind blades are getting bigger and bigger. Due to the large size of wind turbine, nowadays wind turbines are installed very high above the ground or water level. It is impractical to monitor the results from {LDS} through wired connection in these cases. Hence, the wired connection of {LDS} to base (monitoring) station must be replaced by a wireless solution. This wireless solution is achieved using Zigbee technology. Zigbee operates in the industrial, scientific and medical ({ISM)} radio bands, typically 2.4 {GHz}, 915 {MHz} and 868 {MHz.} The output from the {LDS} is fed to the microcontroller which acts as an analog to digital converter. The output from the microcontroller is connected to the Zigbee transceiver module, which transmits the data and at the other end, the zigbee reads the data and displays on the {PC} from where user can monitor the condition of wind blades.
Hyeong-Cheol Kim - One of the best experts on this subject based on the ideXlab platform.
-
Feasibility of in situ blade deflection monitoring of a wind turbine using a Laser Displacement Sensor within the tower
Smart Materials and Structures, 2013Co-Authors: J. R. Lee, Hyeong-Cheol KimAbstract:With the potential of commercially viable global wind power, the use of wind energy is expected to\r rise further, along with related problems. One issue is collision of the wind turbine blades with\r the tower during operation. Structural health monitoring is required to improve operational safety,\r minimize the risk of sudden failure or total breakdown, ensure reliable power generation, and reduce\r wind turbine life cycle costs. To this end, large numbers of Sensors such as fiber Bragg grating and\r piezoelectric devices have been attached to the structure, which is uneconomical and impractical for\r large wind turbines. This study proposes a single Laser Displacement Sensor (LDS) system in which\r all of the rotating blades can be cost-effectively evaluated. In contrast to the approach of blade\r Sensor installation, the LDS system is installed in the tower to enable noncontact blade\r Displacement monitoring. The concept of a noncontact Sensor and actuator and their energy delivery\r device installed in the tower will enable various approaches for wind turbine structural health\r monitoring. Blade bolt loosening can cause deflection in an affected blade. Similarly, nacelle tilt\r or mass loss damage in a blade can result in changes in blade deflection, but the proposed system\r can detect such problems early on.
Pratyush Giri - One of the best experts on this subject based on the ideXlab platform.
-
Development of wireless Laser blade deflection monitoring system for mobile wind turbine management host
Journal of Intelligent Material Systems and Structures, 2014Co-Authors: Pratyush Giri, J. R. LeeAbstract:This study proposes a wireless Laser Displacement Sensor system for in\nsitu deflection monitoring of wind turbine blades. This system consists\nof a tower-installed Laser Displacement Sensor system composed of a\nLaser Displacement Sensor head, controller, Zigbee transmitter, and\nanalog-to-digital converter module, combined with a mobile host that\nincludes a Zigbee receiver and a laptop. In contrast to the approach of\nblade Sensor installation, the Laser Displacement Sensor system is\ninstalled in the tower to enable noncontact blade Displacement\nmonitoring. The concepts of direct noncontact remote sensing and\nactuation from the tower and remote power delivery from the tower to\nblade-installed Sensors and actuators will enable various approaches for\nwind turbine structural health monitoring. The proposed system can\neasily identify problems related to deflection. The size of wind blades\nincreases with energy demands. Due to the large size of wind turbines,\ncurrent wind turbines are installed very high above ground level. It is\nimpractical to monitor the results from Laser Displacement Sensor\nthrough wired connection in these cases. Hence, wired connections of\nLaser Displacement Sensors to base monitoring stations must be replaced\nwith a wireless solution. This wireless solution is achieved using\nZigbee technology. The output from the Laser Displacement Sensor is fed\nto a microcontroller, which acts as an analog-to-digital converter. The\noutput from the microcontroller is connected to the Zigbee transceiver\nmodule, which transmits the data, and at the other end, the Zigbee reads\nthe data and displays it on a PC, from which users can monitor the\ncondition of the wind blades.
-
In-situ Blade Deflection Monitoring of a Wind Turbine using a Wireless Laser Displacement Sensor Device within the Tower
Structural Health Monitoring: Research and Applications, 2013Co-Authors: Pratyush Giri, J. R. Lee, W. K. Chiu, Stephen C. GaleaAbstract:With commercially viable global wind power potential, wind energy penetration is further expected to rise, as will the related problems. One issue is the collision of wind turbine blades with the tower during operation. Structured health monitoring is required to improve operational safety, minimize the risk of sudden failure or total breakdown, ensure reliable power generation, and reduce wind turbine life cycle costs. Large numbers of Sensors such as fiber Bragg grating and piezoelectric devices have been attached to the structure, a design that is uneconomical and impractical for use in large wind turbines. This study proposes a single Laser Displacement Sensor ({LDS)} system in which all of the rotating blades could be cost-effectively evaluated. Contrary to the approach of blade Sensor installation, the {LDS} system is installed in the tower to enable noncontact blade Displacement monitoring. The concept of a noncontact Sensor and actuator and their energy delivery device installation in the tower will enable various approaches for wind turbine structural health monitoring. Blade bolt loosening causes deflection in the affected blade. Similarly, nacelle tilt or mass loss damage in the blade will result in changes in blade deflection, but the proposed system can identify such problems with ease. With the need of more energy, the sizes of wind blades are getting bigger and bigger. Due to the large size of wind turbine, nowadays wind turbines are installed very high above the ground or water level. It is impractical to monitor the results from {LDS} through wired connection in these cases. Hence, the wired connection of {LDS} to base (monitoring) station must be replaced by a wireless solution. This wireless solution is achieved using Zigbee technology. Zigbee operates in the industrial, scientific and medical ({ISM)} radio bands, typically 2.4 {GHz}, 915 {MHz} and 868 {MHz.} The output from the {LDS} is fed to the microcontroller which acts as an analog to digital converter. The output from the microcontroller is connected to the Zigbee transceiver module, which transmits the data and at the other end, the zigbee reads the data and displays on the {PC} from where user can monitor the condition of wind blades.
-
A Real-Time Deflection Monitoring System for Wind Turbine Blades Using a Built-In Laser Displacement Sensor
Proceedings of the 6th European Workshop on Structural Health Monitoring, 2012Co-Authors: H. Kim, Pratyush Giri, Jay LeeAbstract:Renewable energy is considered a good alternative to deal with the issues related to fossil fuel and environmental pollution. Wind energy as one of such renewable energy alternatives has seen a substantial growth. With commercially viable global wind power potential, wind energy penetration is further expected to rise, and so will the related problems. One of the issues is the collision of wind blade and tower during operation. To improve safety during operation, to minimize the risk of sudden failure or total breakdown, and to ensure reliable power generation and reduce wind turbine life cycle costs, a structural health monitoring (SHM) technology is required. This study proposes a single Laser Displacement Sensor (LDS) system, where all of the rotating blades could be evaluated effectively. The system is cost-effective as well, as the system costs only a mere thousand dollars. If the blade bolt loosening occurs, it causes deflection in the affected blade. In a similar manner, nacelle tilt or mass loss damage in the blade will result in change of blade's position and the proposed system can identify such problems with ease. With increased demand of energy, the sizes of wind blades are getting bigger and bigger due to which people are installing wind turbines very high above the ground level or offshore. It is impractical to monitor the deflection through wired connection in these cases and hence can be replaced by a wireless solution. This wireless solution is achieved using Zigbee technology which operates in the industrial, scientific and medical (ISM) radio bands, typically 2.4 GHz, 915 MHz and 868 MHz. The output from the LDS is fed to the microcontroller which acts as an analog to digital converter which in turn is connected to the Zigbee transceiver module, which transmits the data. At the other end, the Zigbee reads the data and displays on the PC from where user can monitor the condition of wind blades.
Se Woon Choi - One of the best experts on this subject based on the ideXlab platform.
-
a wireless Laser Displacement Sensor node for structural health monitoring
Sensors, 2013Co-Authors: Hyo Seon Park, Se Woon ChoiAbstract:This study describes a wireless Laser Displacement Sensor node that measures Displacement as a representative damage index for structural health monitoring (SHM). The proposed measurement system consists of a Laser Displacement Sensor (LDS) and a customized wireless Sensor node. Wireless communication is enabled by a Sensor node that consists of a Sensor module, a code division multiple access (CDMA) communication module, a processor, and a power module. An LDS with a long measurement distance is chosen to increase field applicability. For a wireless Sensor node driven by a battery, we use a power control module with a low-power processor, which facilitates switching between the sleep and active modes, thus maximizing the power consumption efficiency during non-measurement and non-transfer periods. The CDMA mode is also used to overcome the limitation of communication distance, which is a challenge for wireless Sensor networks and wireless communication. To evaluate the reliability and field applicability of the proposed wireless Displacement measurement system, the system is tested onsite to obtain the required vertical Displacement measurements during the construction of mega-trusses and an edge truss, which are the primary structural members in a large-scale irregular building currently under construction. The measurement values confirm the validity of the proposed wireless Displacement measurement system and its potential for use in safety evaluations of structural elements.
Hyo Seon Park - One of the best experts on this subject based on the ideXlab platform.
-
a wireless Laser Displacement Sensor node for structural health monitoring
Sensors, 2013Co-Authors: Hyo Seon Park, Se Woon ChoiAbstract:This study describes a wireless Laser Displacement Sensor node that measures Displacement as a representative damage index for structural health monitoring (SHM). The proposed measurement system consists of a Laser Displacement Sensor (LDS) and a customized wireless Sensor node. Wireless communication is enabled by a Sensor node that consists of a Sensor module, a code division multiple access (CDMA) communication module, a processor, and a power module. An LDS with a long measurement distance is chosen to increase field applicability. For a wireless Sensor node driven by a battery, we use a power control module with a low-power processor, which facilitates switching between the sleep and active modes, thus maximizing the power consumption efficiency during non-measurement and non-transfer periods. The CDMA mode is also used to overcome the limitation of communication distance, which is a challenge for wireless Sensor networks and wireless communication. To evaluate the reliability and field applicability of the proposed wireless Displacement measurement system, the system is tested onsite to obtain the required vertical Displacement measurements during the construction of mega-trusses and an edge truss, which are the primary structural members in a large-scale irregular building currently under construction. The measurement values confirm the validity of the proposed wireless Displacement measurement system and its potential for use in safety evaluations of structural elements.
