The Experts below are selected from a list of 1563 Experts worldwide ranked by ideXlab platform

Kyuho Sim - One of the best experts on this subject based on the ideXlab platform.

  • Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures
    Journal of Mechanical Science and Technology, 2014
    Co-Authors: Kyuho Sim, Jin Woo Song, Yong-bok Lee, Jong-baeg Kim, Tae Ho Kim
    Abstract:

    This paper presents an experimental investigation of the dynamic force performance of gas foil bearings (GFBs) at high temperatures. A dynamic performance test rig with a GFB mounted on a rotating Hollow Shaft, heated by a cartridge heater inside the Hollow Shaft, and excited by two orthogonally positioned electromagnetic shakers determines the frequency dependent stiffness and damping coefficients of the test GFB for increasing Shaft temperatures. The test heater temperatures are 21°C (room temperature without heating), 100°C, 200°C, 300°C, and 400°C, and the excitation frequencies are 120 Hz, 140 Hz, 160 Hz, and 180 Hz. The test rotating speed and static load are 12 krpm and 30 N, respectively. The vibration amplitude of the test GFB is adjusted to approximately 30 μm by controlling the power amplifier connected to the electromagnetic shakers throughout the series of experiments. The test results show that both the direct stiffness and damping coefficients of the test GFB increase with increasing excitation frequencies. As the Shaft temperature increases, the direct stiffness coefficients decrease by ∼ 8%, and the direct damping coefficients decrease by approximately 30%. A model prediction benchmarked against the test data reveals that the cross-coupled stiffness coefficients are smaller than the direct stiffness coefficients for the test GFB.

  • Thermal Performance Measurement of a Bump Type Gas Foil Bearing Floating on a Hollow Shaft for Increasing Rotating Speed and Static Load
    Journal of Engineering for Gas Turbines and Power, 2011
    Co-Authors: Tae Ho Kim, Yong-bok Lee, Jin Woo Song, Kyuho Sim
    Abstract:

    Identifying thermal characteristics of gas foil bearings (GFBs) provides an insight for successful implementation into high speed oil-free turbomachinery. The paper presents temperature measurements of a bump type GFB floating on a Hollow Shaft for various operating conditions. Two angular ball bearings support the Hollow Shaft at one end (right), and the other end (left) is free. Test GFB has the outer diameter of 100 mm and the axial length of 45 mm, and the Hollow Shaft has the outer and inner diameters of 60 mm and 40 mm, respectively. An electric motor drives the Hollow Shaft using a spline coupling connection. A mechanical loading device provides static loads on test GFB upward via a metal wire, and a strain gauge type load cell placed in the middle of the wire indicates the applied loads. During experiments for Shaft speeds of 5 krpm, 10 krpm, and 15 krpm and with static loads of 58.9 N (6 kgf), 78.5 N (8 kgf), and 98.1 N (10 kgf), twelve thermocouples measure the outer surface temperatures of test GFB at four angular locations of 45 deg, 135 deg, 215 deg, and 315 deg, with an origin at the top foil free end, and three axial locations of bearing centerline and both side edges at each angle. Two infrared thermometers measure the outer surface temperature of the Hollow Shaft at free and supported ends close to test GFB. Test results show that GFB temperatures increase as the Shaft speed increases and as the static load increases, with higher temperatures in the loaded zone (135 deg and 215 deg) than those in the unloaded zone (45 deg and 315 deg). In general, the recorded temperatures are highest at 225 deg where a highest hydrodynamic pressure is expected to build up. Measured temperatures at the bearing centerline are higher than those at the side edges, as expected. In addition, large thermal gradients are recorded in the Hollow Shaft along the axial direction with higher temperatures at the supported end. The axial thermal gradient of the Shaft is thought to cause higher temperatures at the bearing right edge facing the ball bearing support than those at the left edge. The paper presents test data along with detailed test GFB/Shaft geometries and material properties.

  • Thermal Performance of a Bump Type Gas Foil Bearing Floating on a Hollow Shaft for Increasing Rotating Speed and Static Load
    Volume 6: Structures and Dynamics Parts A and B, 2011
    Co-Authors: Kyuho Sim, Jin Woo Song, Yong-bok Lee, Tae Ho Kim
    Abstract:

    Identifying thermal characteristics of gas foil bearings (GFBs) provides an insight for successful implementation into high speed oil-free turbomachinery. The paper presents temperature measurements of a bump type GFB floating on a Hollow Shaft for various operating conditions. Two angular ball bearings support the Hollow Shaft at one end (right), and the other end (left) is free. Test GFB has the outer diameter of 100 mm and the axial length of 45 mm, and the Hollow Shaft has the outer and inner diameters of 60 mm and 40 mm, respectively. An electric motor drives the Hollow Shaft using a spline coupling connection. A mechanical loading device provides static loads on test GFB upward via a metal wire, and a strain gauge type load cell placed in the middle of the wire indicates the applied loads. During experiments for Shaft speeds of 5 krpm, 10 krpm, and 15 krpm and with static loads of 58.86 N (6 kgf ), 78.48 N (8 kgf ), and 98.1 N (10 kgf ), twelve thermocouples measure the outer surface temperatures of test GFB at four angular locations of 45 deg, 135 deg, 215 deg, and 315 deg, with an origin at the top foil free end, and three axial locations of bearing centerline and both side edges at each angle. Two infrared thermometers measure the outer surface temperature of the Hollow Shaft at free and supported ends close to test GFB. Test results show that GFB temperatures increase as the Shaft speed increases and as the static load increases, with higher temperatures in the loading zone (135 deg and 215 deg) than those in the unloading zone (45 deg and 315 deg). In general, the recorded temperatures are highest at 225 deg where a highest hydrodynamic pressure is expected to build up. Measured temperatures at the bearing centerline are higher than those at the side edges, as expected. In addition, large thermal gradients are recorded in the Hollow Shaft along the axial direction with higher temperatures at the supported end. Angular ball bearings and lip seal supporting the Hollow Shaft might produce significant heat generation due to mechanical contact as the Shaft speed increases. The axial thermal gradient of the Shaft is thought to cause higher temperatures at the bearing right edge facing the ball bearing support than those at the left edge. The present test data along with detailed test GFB/Shaft geometries and material properties benchmark thermohydrodynamic (THD) model predictions of test GFB with a rotating Hollow Shaft.Copyright © 2011 by ASME

Tae Ho Kim - One of the best experts on this subject based on the ideXlab platform.

  • Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures
    Journal of Mechanical Science and Technology, 2014
    Co-Authors: Kyuho Sim, Jin Woo Song, Yong-bok Lee, Jong-baeg Kim, Tae Ho Kim
    Abstract:

    This paper presents an experimental investigation of the dynamic force performance of gas foil bearings (GFBs) at high temperatures. A dynamic performance test rig with a GFB mounted on a rotating Hollow Shaft, heated by a cartridge heater inside the Hollow Shaft, and excited by two orthogonally positioned electromagnetic shakers determines the frequency dependent stiffness and damping coefficients of the test GFB for increasing Shaft temperatures. The test heater temperatures are 21°C (room temperature without heating), 100°C, 200°C, 300°C, and 400°C, and the excitation frequencies are 120 Hz, 140 Hz, 160 Hz, and 180 Hz. The test rotating speed and static load are 12 krpm and 30 N, respectively. The vibration amplitude of the test GFB is adjusted to approximately 30 μm by controlling the power amplifier connected to the electromagnetic shakers throughout the series of experiments. The test results show that both the direct stiffness and damping coefficients of the test GFB increase with increasing excitation frequencies. As the Shaft temperature increases, the direct stiffness coefficients decrease by ∼ 8%, and the direct damping coefficients decrease by approximately 30%. A model prediction benchmarked against the test data reveals that the cross-coupled stiffness coefficients are smaller than the direct stiffness coefficients for the test GFB.

  • Thermal Performance Measurement of a Bump Type Gas Foil Bearing Floating on a Hollow Shaft for Increasing Rotating Speed and Static Load
    Journal of Engineering for Gas Turbines and Power, 2011
    Co-Authors: Tae Ho Kim, Yong-bok Lee, Jin Woo Song, Kyuho Sim
    Abstract:

    Identifying thermal characteristics of gas foil bearings (GFBs) provides an insight for successful implementation into high speed oil-free turbomachinery. The paper presents temperature measurements of a bump type GFB floating on a Hollow Shaft for various operating conditions. Two angular ball bearings support the Hollow Shaft at one end (right), and the other end (left) is free. Test GFB has the outer diameter of 100 mm and the axial length of 45 mm, and the Hollow Shaft has the outer and inner diameters of 60 mm and 40 mm, respectively. An electric motor drives the Hollow Shaft using a spline coupling connection. A mechanical loading device provides static loads on test GFB upward via a metal wire, and a strain gauge type load cell placed in the middle of the wire indicates the applied loads. During experiments for Shaft speeds of 5 krpm, 10 krpm, and 15 krpm and with static loads of 58.9 N (6 kgf), 78.5 N (8 kgf), and 98.1 N (10 kgf), twelve thermocouples measure the outer surface temperatures of test GFB at four angular locations of 45 deg, 135 deg, 215 deg, and 315 deg, with an origin at the top foil free end, and three axial locations of bearing centerline and both side edges at each angle. Two infrared thermometers measure the outer surface temperature of the Hollow Shaft at free and supported ends close to test GFB. Test results show that GFB temperatures increase as the Shaft speed increases and as the static load increases, with higher temperatures in the loaded zone (135 deg and 215 deg) than those in the unloaded zone (45 deg and 315 deg). In general, the recorded temperatures are highest at 225 deg where a highest hydrodynamic pressure is expected to build up. Measured temperatures at the bearing centerline are higher than those at the side edges, as expected. In addition, large thermal gradients are recorded in the Hollow Shaft along the axial direction with higher temperatures at the supported end. The axial thermal gradient of the Shaft is thought to cause higher temperatures at the bearing right edge facing the ball bearing support than those at the left edge. The paper presents test data along with detailed test GFB/Shaft geometries and material properties.

  • Thermal Performance of a Bump Type Gas Foil Bearing Floating on a Hollow Shaft for Increasing Rotating Speed and Static Load
    Volume 6: Structures and Dynamics Parts A and B, 2011
    Co-Authors: Kyuho Sim, Jin Woo Song, Yong-bok Lee, Tae Ho Kim
    Abstract:

    Identifying thermal characteristics of gas foil bearings (GFBs) provides an insight for successful implementation into high speed oil-free turbomachinery. The paper presents temperature measurements of a bump type GFB floating on a Hollow Shaft for various operating conditions. Two angular ball bearings support the Hollow Shaft at one end (right), and the other end (left) is free. Test GFB has the outer diameter of 100 mm and the axial length of 45 mm, and the Hollow Shaft has the outer and inner diameters of 60 mm and 40 mm, respectively. An electric motor drives the Hollow Shaft using a spline coupling connection. A mechanical loading device provides static loads on test GFB upward via a metal wire, and a strain gauge type load cell placed in the middle of the wire indicates the applied loads. During experiments for Shaft speeds of 5 krpm, 10 krpm, and 15 krpm and with static loads of 58.86 N (6 kgf ), 78.48 N (8 kgf ), and 98.1 N (10 kgf ), twelve thermocouples measure the outer surface temperatures of test GFB at four angular locations of 45 deg, 135 deg, 215 deg, and 315 deg, with an origin at the top foil free end, and three axial locations of bearing centerline and both side edges at each angle. Two infrared thermometers measure the outer surface temperature of the Hollow Shaft at free and supported ends close to test GFB. Test results show that GFB temperatures increase as the Shaft speed increases and as the static load increases, with higher temperatures in the loading zone (135 deg and 215 deg) than those in the unloading zone (45 deg and 315 deg). In general, the recorded temperatures are highest at 225 deg where a highest hydrodynamic pressure is expected to build up. Measured temperatures at the bearing centerline are higher than those at the side edges, as expected. In addition, large thermal gradients are recorded in the Hollow Shaft along the axial direction with higher temperatures at the supported end. Angular ball bearings and lip seal supporting the Hollow Shaft might produce significant heat generation due to mechanical contact as the Shaft speed increases. The axial thermal gradient of the Shaft is thought to cause higher temperatures at the bearing right edge facing the ball bearing support than those at the left edge. The present test data along with detailed test GFB/Shaft geometries and material properties benchmark thermohydrodynamic (THD) model predictions of test GFB with a rotating Hollow Shaft.Copyright © 2011 by ASME

Jin Woo Song - One of the best experts on this subject based on the ideXlab platform.

  • Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures
    Journal of Mechanical Science and Technology, 2014
    Co-Authors: Kyuho Sim, Jin Woo Song, Yong-bok Lee, Jong-baeg Kim, Tae Ho Kim
    Abstract:

    This paper presents an experimental investigation of the dynamic force performance of gas foil bearings (GFBs) at high temperatures. A dynamic performance test rig with a GFB mounted on a rotating Hollow Shaft, heated by a cartridge heater inside the Hollow Shaft, and excited by two orthogonally positioned electromagnetic shakers determines the frequency dependent stiffness and damping coefficients of the test GFB for increasing Shaft temperatures. The test heater temperatures are 21°C (room temperature without heating), 100°C, 200°C, 300°C, and 400°C, and the excitation frequencies are 120 Hz, 140 Hz, 160 Hz, and 180 Hz. The test rotating speed and static load are 12 krpm and 30 N, respectively. The vibration amplitude of the test GFB is adjusted to approximately 30 μm by controlling the power amplifier connected to the electromagnetic shakers throughout the series of experiments. The test results show that both the direct stiffness and damping coefficients of the test GFB increase with increasing excitation frequencies. As the Shaft temperature increases, the direct stiffness coefficients decrease by ∼ 8%, and the direct damping coefficients decrease by approximately 30%. A model prediction benchmarked against the test data reveals that the cross-coupled stiffness coefficients are smaller than the direct stiffness coefficients for the test GFB.

  • Thermal Performance Measurement of a Bump Type Gas Foil Bearing Floating on a Hollow Shaft for Increasing Rotating Speed and Static Load
    Journal of Engineering for Gas Turbines and Power, 2011
    Co-Authors: Tae Ho Kim, Yong-bok Lee, Jin Woo Song, Kyuho Sim
    Abstract:

    Identifying thermal characteristics of gas foil bearings (GFBs) provides an insight for successful implementation into high speed oil-free turbomachinery. The paper presents temperature measurements of a bump type GFB floating on a Hollow Shaft for various operating conditions. Two angular ball bearings support the Hollow Shaft at one end (right), and the other end (left) is free. Test GFB has the outer diameter of 100 mm and the axial length of 45 mm, and the Hollow Shaft has the outer and inner diameters of 60 mm and 40 mm, respectively. An electric motor drives the Hollow Shaft using a spline coupling connection. A mechanical loading device provides static loads on test GFB upward via a metal wire, and a strain gauge type load cell placed in the middle of the wire indicates the applied loads. During experiments for Shaft speeds of 5 krpm, 10 krpm, and 15 krpm and with static loads of 58.9 N (6 kgf), 78.5 N (8 kgf), and 98.1 N (10 kgf), twelve thermocouples measure the outer surface temperatures of test GFB at four angular locations of 45 deg, 135 deg, 215 deg, and 315 deg, with an origin at the top foil free end, and three axial locations of bearing centerline and both side edges at each angle. Two infrared thermometers measure the outer surface temperature of the Hollow Shaft at free and supported ends close to test GFB. Test results show that GFB temperatures increase as the Shaft speed increases and as the static load increases, with higher temperatures in the loaded zone (135 deg and 215 deg) than those in the unloaded zone (45 deg and 315 deg). In general, the recorded temperatures are highest at 225 deg where a highest hydrodynamic pressure is expected to build up. Measured temperatures at the bearing centerline are higher than those at the side edges, as expected. In addition, large thermal gradients are recorded in the Hollow Shaft along the axial direction with higher temperatures at the supported end. The axial thermal gradient of the Shaft is thought to cause higher temperatures at the bearing right edge facing the ball bearing support than those at the left edge. The paper presents test data along with detailed test GFB/Shaft geometries and material properties.

  • Thermal Performance of a Bump Type Gas Foil Bearing Floating on a Hollow Shaft for Increasing Rotating Speed and Static Load
    Volume 6: Structures and Dynamics Parts A and B, 2011
    Co-Authors: Kyuho Sim, Jin Woo Song, Yong-bok Lee, Tae Ho Kim
    Abstract:

    Identifying thermal characteristics of gas foil bearings (GFBs) provides an insight for successful implementation into high speed oil-free turbomachinery. The paper presents temperature measurements of a bump type GFB floating on a Hollow Shaft for various operating conditions. Two angular ball bearings support the Hollow Shaft at one end (right), and the other end (left) is free. Test GFB has the outer diameter of 100 mm and the axial length of 45 mm, and the Hollow Shaft has the outer and inner diameters of 60 mm and 40 mm, respectively. An electric motor drives the Hollow Shaft using a spline coupling connection. A mechanical loading device provides static loads on test GFB upward via a metal wire, and a strain gauge type load cell placed in the middle of the wire indicates the applied loads. During experiments for Shaft speeds of 5 krpm, 10 krpm, and 15 krpm and with static loads of 58.86 N (6 kgf ), 78.48 N (8 kgf ), and 98.1 N (10 kgf ), twelve thermocouples measure the outer surface temperatures of test GFB at four angular locations of 45 deg, 135 deg, 215 deg, and 315 deg, with an origin at the top foil free end, and three axial locations of bearing centerline and both side edges at each angle. Two infrared thermometers measure the outer surface temperature of the Hollow Shaft at free and supported ends close to test GFB. Test results show that GFB temperatures increase as the Shaft speed increases and as the static load increases, with higher temperatures in the loading zone (135 deg and 215 deg) than those in the unloading zone (45 deg and 315 deg). In general, the recorded temperatures are highest at 225 deg where a highest hydrodynamic pressure is expected to build up. Measured temperatures at the bearing centerline are higher than those at the side edges, as expected. In addition, large thermal gradients are recorded in the Hollow Shaft along the axial direction with higher temperatures at the supported end. Angular ball bearings and lip seal supporting the Hollow Shaft might produce significant heat generation due to mechanical contact as the Shaft speed increases. The axial thermal gradient of the Shaft is thought to cause higher temperatures at the bearing right edge facing the ball bearing support than those at the left edge. The present test data along with detailed test GFB/Shaft geometries and material properties benchmark thermohydrodynamic (THD) model predictions of test GFB with a rotating Hollow Shaft.Copyright © 2011 by ASME

Yong-bok Lee - One of the best experts on this subject based on the ideXlab platform.

  • Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures
    Journal of Mechanical Science and Technology, 2014
    Co-Authors: Kyuho Sim, Jin Woo Song, Yong-bok Lee, Jong-baeg Kim, Tae Ho Kim
    Abstract:

    This paper presents an experimental investigation of the dynamic force performance of gas foil bearings (GFBs) at high temperatures. A dynamic performance test rig with a GFB mounted on a rotating Hollow Shaft, heated by a cartridge heater inside the Hollow Shaft, and excited by two orthogonally positioned electromagnetic shakers determines the frequency dependent stiffness and damping coefficients of the test GFB for increasing Shaft temperatures. The test heater temperatures are 21°C (room temperature without heating), 100°C, 200°C, 300°C, and 400°C, and the excitation frequencies are 120 Hz, 140 Hz, 160 Hz, and 180 Hz. The test rotating speed and static load are 12 krpm and 30 N, respectively. The vibration amplitude of the test GFB is adjusted to approximately 30 μm by controlling the power amplifier connected to the electromagnetic shakers throughout the series of experiments. The test results show that both the direct stiffness and damping coefficients of the test GFB increase with increasing excitation frequencies. As the Shaft temperature increases, the direct stiffness coefficients decrease by ∼ 8%, and the direct damping coefficients decrease by approximately 30%. A model prediction benchmarked against the test data reveals that the cross-coupled stiffness coefficients are smaller than the direct stiffness coefficients for the test GFB.

  • Thermal Performance Measurement of a Bump Type Gas Foil Bearing Floating on a Hollow Shaft for Increasing Rotating Speed and Static Load
    Journal of Engineering for Gas Turbines and Power, 2011
    Co-Authors: Tae Ho Kim, Yong-bok Lee, Jin Woo Song, Kyuho Sim
    Abstract:

    Identifying thermal characteristics of gas foil bearings (GFBs) provides an insight for successful implementation into high speed oil-free turbomachinery. The paper presents temperature measurements of a bump type GFB floating on a Hollow Shaft for various operating conditions. Two angular ball bearings support the Hollow Shaft at one end (right), and the other end (left) is free. Test GFB has the outer diameter of 100 mm and the axial length of 45 mm, and the Hollow Shaft has the outer and inner diameters of 60 mm and 40 mm, respectively. An electric motor drives the Hollow Shaft using a spline coupling connection. A mechanical loading device provides static loads on test GFB upward via a metal wire, and a strain gauge type load cell placed in the middle of the wire indicates the applied loads. During experiments for Shaft speeds of 5 krpm, 10 krpm, and 15 krpm and with static loads of 58.9 N (6 kgf), 78.5 N (8 kgf), and 98.1 N (10 kgf), twelve thermocouples measure the outer surface temperatures of test GFB at four angular locations of 45 deg, 135 deg, 215 deg, and 315 deg, with an origin at the top foil free end, and three axial locations of bearing centerline and both side edges at each angle. Two infrared thermometers measure the outer surface temperature of the Hollow Shaft at free and supported ends close to test GFB. Test results show that GFB temperatures increase as the Shaft speed increases and as the static load increases, with higher temperatures in the loaded zone (135 deg and 215 deg) than those in the unloaded zone (45 deg and 315 deg). In general, the recorded temperatures are highest at 225 deg where a highest hydrodynamic pressure is expected to build up. Measured temperatures at the bearing centerline are higher than those at the side edges, as expected. In addition, large thermal gradients are recorded in the Hollow Shaft along the axial direction with higher temperatures at the supported end. The axial thermal gradient of the Shaft is thought to cause higher temperatures at the bearing right edge facing the ball bearing support than those at the left edge. The paper presents test data along with detailed test GFB/Shaft geometries and material properties.

  • Thermal Performance of a Bump Type Gas Foil Bearing Floating on a Hollow Shaft for Increasing Rotating Speed and Static Load
    Volume 6: Structures and Dynamics Parts A and B, 2011
    Co-Authors: Kyuho Sim, Jin Woo Song, Yong-bok Lee, Tae Ho Kim
    Abstract:

    Identifying thermal characteristics of gas foil bearings (GFBs) provides an insight for successful implementation into high speed oil-free turbomachinery. The paper presents temperature measurements of a bump type GFB floating on a Hollow Shaft for various operating conditions. Two angular ball bearings support the Hollow Shaft at one end (right), and the other end (left) is free. Test GFB has the outer diameter of 100 mm and the axial length of 45 mm, and the Hollow Shaft has the outer and inner diameters of 60 mm and 40 mm, respectively. An electric motor drives the Hollow Shaft using a spline coupling connection. A mechanical loading device provides static loads on test GFB upward via a metal wire, and a strain gauge type load cell placed in the middle of the wire indicates the applied loads. During experiments for Shaft speeds of 5 krpm, 10 krpm, and 15 krpm and with static loads of 58.86 N (6 kgf ), 78.48 N (8 kgf ), and 98.1 N (10 kgf ), twelve thermocouples measure the outer surface temperatures of test GFB at four angular locations of 45 deg, 135 deg, 215 deg, and 315 deg, with an origin at the top foil free end, and three axial locations of bearing centerline and both side edges at each angle. Two infrared thermometers measure the outer surface temperature of the Hollow Shaft at free and supported ends close to test GFB. Test results show that GFB temperatures increase as the Shaft speed increases and as the static load increases, with higher temperatures in the loading zone (135 deg and 215 deg) than those in the unloading zone (45 deg and 315 deg). In general, the recorded temperatures are highest at 225 deg where a highest hydrodynamic pressure is expected to build up. Measured temperatures at the bearing centerline are higher than those at the side edges, as expected. In addition, large thermal gradients are recorded in the Hollow Shaft along the axial direction with higher temperatures at the supported end. Angular ball bearings and lip seal supporting the Hollow Shaft might produce significant heat generation due to mechanical contact as the Shaft speed increases. The axial thermal gradient of the Shaft is thought to cause higher temperatures at the bearing right edge facing the ball bearing support than those at the left edge. The present test data along with detailed test GFB/Shaft geometries and material properties benchmark thermohydrodynamic (THD) model predictions of test GFB with a rotating Hollow Shaft.Copyright © 2011 by ASME

Satoshi Tadokoro - One of the best experts on this subject based on the ideXlab platform.

  • a high speed locomotion mechanism using pneumatic Hollow Shaft actuators for in pipe robots
    Intelligent Robots and Systems, 2015
    Co-Authors: Tomonari Yamamoto, Masashi Konyo, Satoshi Tadokoro
    Abstract:

    This study proposes a high-speed locomotion mechanism for a pipe-inspection robot. As a result of the narrow and complex structures of pipeline networks, it is difficult for robots to move quickly within the pipes. The new pneumatic mechanism proposed here realizes high-speed locomotion along with advantageous features for pipe inspection including a small diameter, flexibility, and low weight. First, we present the design concept of the novel locomotion mechanism using pneumatic flexible Hollow-Shaft actuators, which was previously developed by the authors. The prototype constructed to realize this concept and the associated mathematical model are then introduced. Second, the basic characteristics of the proposed mechanism are evaluated in terms of the holding force (generated by an expansion mechanism against the pipe wall) and the impellent force that induces forward motion in the robot. Finally, the in-pipe movement performance is confirmed. The experimental results show that the designed robot can be propelled inside a 53-mm-diameter pipe at a maximum speed of 250 mm/s, which is exceedingly faster than conventional designs.

  • IROS - A high-speed locomotion mechanism using pneumatic Hollow-Shaft actuators for in-pipe robots
    2015 IEEE RSJ International Conference on Intelligent Robots and Systems (IROS), 2015
    Co-Authors: Tomonari Yamamoto, Masashi Konyo, Satoshi Tadokoro
    Abstract:

    This study proposes a high-speed locomotion mechanism for a pipe-inspection robot. As a result of the narrow and complex structures of pipeline networks, it is difficult for robots to move quickly within the pipes. The new pneumatic mechanism proposed here realizes high-speed locomotion along with advantageous features for pipe inspection including a small diameter, flexibility, and low weight. First, we present the design concept of the novel locomotion mechanism using pneumatic flexible Hollow-Shaft actuators, which was previously developed by the authors. The prototype constructed to realize this concept and the associated mathematical model are then introduced. Second, the basic characteristics of the proposed mechanism are evaluated in terms of the holding force (generated by an expansion mechanism against the pipe wall) and the impellent force that induces forward motion in the robot. Finally, the in-pipe movement performance is confirmed. The experimental results show that the designed robot can be propelled inside a 53-mm-diameter pipe at a maximum speed of 250 mm/s, which is exceedingly faster than conventional designs.