The Experts below are selected from a list of 4788 Experts worldwide ranked by ideXlab platform

N. R. Shimp - One of the best experts on this subject based on the ideXlab platform.

  • Orbital transfer vehicle oxygen turbopump technology. Volume 1: Design, fabrication, and hydrostatic bearing testing
    1990
    Co-Authors: P. S. Buckmann, W. R. Hayden, S. A. Lorenc, R. L. Sabiers, N. R. Shimp
    Abstract:

    The design, fabrication, and initial testing of a rocket engine turbopump (TPA) for the delivery of high pressure liquid oxygen using hot oxygen for the turbine drive fluid are described. This TPA is basic to the dual expander engine which uses both oxygen and hydrogen as working fluids. Separate tasks addressed the key issue of materials for this TPA. All materials selections emphasized compatibility with hot oxygen. The OX TPA design uses a two-stage centrifugal pump driven by a single-stage axial turbine on a common Shaft. The design includes ports for three Shaft Displacement/speed sensors, various temperature measurements, and accelerometers.

  • Orbital transfer vehicle oxygen turbopump technology. Volume 1: Design, fabrication, and hydrostatic bearing testing. Final Report
    1990
    Co-Authors: P. S. Buckmann, W. R. Hayden, S. A. Lorenc, R. L. Sabiers, N. R. Shimp
    Abstract:

    The design, fabrication, and initial testing of a rocket engine turbopump (TPA) for the delivery of high pressure liquid oxygen using hot oxygen for the turbine drive fluid are described. This TPA is basic to the dual expander engine which uses both oxygen and hydrogen as working fluids. Separate tasks addressed the key issue of materials for this TPA. All materials selections emphasized compatibility with hot oxygen. The OX TPA design uses a two-stage centrifugal pump driven by a single-stage axial turbine on a common Shaft. The design includes ports for three Shaft Displacement/speed sensors, various temperature measurements, and accelerometers.

P. S. Buckmann - One of the best experts on this subject based on the ideXlab platform.

  • Orbital transfer vehicle oxygen turbopump technology. Volume 1: Design, fabrication, and hydrostatic bearing testing
    1990
    Co-Authors: P. S. Buckmann, W. R. Hayden, S. A. Lorenc, R. L. Sabiers, N. R. Shimp
    Abstract:

    The design, fabrication, and initial testing of a rocket engine turbopump (TPA) for the delivery of high pressure liquid oxygen using hot oxygen for the turbine drive fluid are described. This TPA is basic to the dual expander engine which uses both oxygen and hydrogen as working fluids. Separate tasks addressed the key issue of materials for this TPA. All materials selections emphasized compatibility with hot oxygen. The OX TPA design uses a two-stage centrifugal pump driven by a single-stage axial turbine on a common Shaft. The design includes ports for three Shaft Displacement/speed sensors, various temperature measurements, and accelerometers.

  • Orbital transfer vehicle oxygen turbopump technology. Volume 1: Design, fabrication, and hydrostatic bearing testing. Final Report
    1990
    Co-Authors: P. S. Buckmann, W. R. Hayden, S. A. Lorenc, R. L. Sabiers, N. R. Shimp
    Abstract:

    The design, fabrication, and initial testing of a rocket engine turbopump (TPA) for the delivery of high pressure liquid oxygen using hot oxygen for the turbine drive fluid are described. This TPA is basic to the dual expander engine which uses both oxygen and hydrogen as working fluids. Separate tasks addressed the key issue of materials for this TPA. All materials selections emphasized compatibility with hot oxygen. The OX TPA design uses a two-stage centrifugal pump driven by a single-stage axial turbine on a common Shaft. The design includes ports for three Shaft Displacement/speed sensors, various temperature measurements, and accelerometers.

Yi-hua Fan - One of the best experts on this subject based on the ideXlab platform.

  • Design of model-based unbalance compensator with fuzzy gain tuning mechanism for an active magnetic bearing system
    Expert Systems with Applications, 2011
    Co-Authors: Pi-cheng Tung, Mong-tao Tsai, Kuan-yu Chen, Yi-hua Fan, Fu-chu Chou
    Abstract:

    This paper deals with the unbalanced vibration problem of a stabilized active magnetic bearing (AMB) system. First, a model-based integral-type observer is proposed to evaluate the Shaft Displacement and the unbalancing forces of the rotor of an AMB system controlled by a proportional-integral-derivative (PID) controller. A fuzzy gain tuning mechanism is added to adjust the output of the PID controller in order to overcome the disturbances and suppress the unbalancing vibration. We have shown via simulation that the addition of the integral-type force observer improves the rotating accuracy in the device operating range. The experimental results demonstrate an efficient reduction of the Shaft Displacement of the rotor. Thus, the proposed scheme allows for a remarkable improvement in the unbalanced vibration of an AMB system over conventional PID controls without fuzzy gain tuning mechanism.

  • a self tuning fuzzy pid type controller design for unbalance compensation in an active magnetic bearing
    Expert Systems With Applications, 2009
    Co-Authors: Kuan-yu Chen, Pi-cheng Tung, Mong-tao Tsai, Yi-hua Fan
    Abstract:

    This paper presents a design for a fuzzy gain tuning mechanism dealing with the problem of unbalanced vibration problem in an active magnetic bearing (AMB) system. For the purpose of enhancing the performance of the AMB system, we replace the conventional proportional-integral-derivative (PID) controller with a self-tuning fuzzy PID-type controller (FPIDC). The Shaft Displacement and the unbalanced forces of the rotor are evaluated by model-based observation. If there are model uncertainties in the rotor system or nonlinearities in the magnetic bearing system, this observer may not work well at any operating speed. A fuzzy gain tuner is added to adjust the actuating signal of the self-tuning FPIDC in order to overcome the disturbances and suppress the unbalancing vibration. The experimental results show that the proposed scheme allows for a remarkable improvement in reducing vibration in an unbalanced AMB system as well as demonstrate an efficient reduction in the Shaft Displacement of the rotor.

S. A. Lorenc - One of the best experts on this subject based on the ideXlab platform.

  • Orbital transfer vehicle oxygen turbopump technology. Volume 1: Design, fabrication, and hydrostatic bearing testing
    1990
    Co-Authors: P. S. Buckmann, W. R. Hayden, S. A. Lorenc, R. L. Sabiers, N. R. Shimp
    Abstract:

    The design, fabrication, and initial testing of a rocket engine turbopump (TPA) for the delivery of high pressure liquid oxygen using hot oxygen for the turbine drive fluid are described. This TPA is basic to the dual expander engine which uses both oxygen and hydrogen as working fluids. Separate tasks addressed the key issue of materials for this TPA. All materials selections emphasized compatibility with hot oxygen. The OX TPA design uses a two-stage centrifugal pump driven by a single-stage axial turbine on a common Shaft. The design includes ports for three Shaft Displacement/speed sensors, various temperature measurements, and accelerometers.

  • Orbital transfer vehicle oxygen turbopump technology. Volume 1: Design, fabrication, and hydrostatic bearing testing. Final Report
    1990
    Co-Authors: P. S. Buckmann, W. R. Hayden, S. A. Lorenc, R. L. Sabiers, N. R. Shimp
    Abstract:

    The design, fabrication, and initial testing of a rocket engine turbopump (TPA) for the delivery of high pressure liquid oxygen using hot oxygen for the turbine drive fluid are described. This TPA is basic to the dual expander engine which uses both oxygen and hydrogen as working fluids. Separate tasks addressed the key issue of materials for this TPA. All materials selections emphasized compatibility with hot oxygen. The OX TPA design uses a two-stage centrifugal pump driven by a single-stage axial turbine on a common Shaft. The design includes ports for three Shaft Displacement/speed sensors, various temperature measurements, and accelerometers.

W. R. Hayden - One of the best experts on this subject based on the ideXlab platform.

  • Orbital transfer vehicle oxygen turbopump technology. Volume 1: Design, fabrication, and hydrostatic bearing testing
    1990
    Co-Authors: P. S. Buckmann, W. R. Hayden, S. A. Lorenc, R. L. Sabiers, N. R. Shimp
    Abstract:

    The design, fabrication, and initial testing of a rocket engine turbopump (TPA) for the delivery of high pressure liquid oxygen using hot oxygen for the turbine drive fluid are described. This TPA is basic to the dual expander engine which uses both oxygen and hydrogen as working fluids. Separate tasks addressed the key issue of materials for this TPA. All materials selections emphasized compatibility with hot oxygen. The OX TPA design uses a two-stage centrifugal pump driven by a single-stage axial turbine on a common Shaft. The design includes ports for three Shaft Displacement/speed sensors, various temperature measurements, and accelerometers.

  • Orbital transfer vehicle oxygen turbopump technology. Volume 1: Design, fabrication, and hydrostatic bearing testing. Final Report
    1990
    Co-Authors: P. S. Buckmann, W. R. Hayden, S. A. Lorenc, R. L. Sabiers, N. R. Shimp
    Abstract:

    The design, fabrication, and initial testing of a rocket engine turbopump (TPA) for the delivery of high pressure liquid oxygen using hot oxygen for the turbine drive fluid are described. This TPA is basic to the dual expander engine which uses both oxygen and hydrogen as working fluids. Separate tasks addressed the key issue of materials for this TPA. All materials selections emphasized compatibility with hot oxygen. The OX TPA design uses a two-stage centrifugal pump driven by a single-stage axial turbine on a common Shaft. The design includes ports for three Shaft Displacement/speed sensors, various temperature measurements, and accelerometers.