Test Apparatus

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Takuya Ohara - One of the best experts on this subject based on the ideXlab platform.

  • Reduction of Contact Force Fluctuation for Rotary Wear Test Apparatus
    IEEE ASME Transactions on Mechatronics, 2020
    Co-Authors: Minoru Yokoyama, Tomoyuki Shimono, Chikara Yamashita, Sei Nagasaka, Takuya Ohara
    Abstract:

    In electric railway systems, wear of current collector devices leads to high maintenance cost. To develop a cost reduction methodology, the wear behavior of current collector materials needs to be fully investigated. However, the wear Test Apparatuses currently in use cannot control the contact force between materials, and the contact force fluctuates. It is difficult to classify accurate conditions of a wear transition under contact force fluctuation. To solve this problem, we propose a force control system with acceleration and velocity feedbacks to suppress the force fluctuation. The positive feedback of acceleration compensates the periodic force fluctuation at frequencies according to the sliding velocity of rubbing surfaces. The velocity feedback compensates the force fluctuation caused by resonance. The proposed control system is validated by experiments using a prototype of a rotary wear Test Apparatus.

  • Feasibility study on application of force control to wear Test Apparatus for contact current collection system
    2016 IEEE International Power Electronics and Motion Control Conference (PEMC), 2016
    Co-Authors: Minoru Yokoyama, Tomoyuki Shimono, Chikara Yamashita, Sei Nagasaka, Takuya Ohara
    Abstract:

    In wear Tests under high speed conditions for the contact current collection system of electric trains, a load given to materials fluctuates largely. This fluctuation disturbs the accurate measurement of the wear mode transition. Force control is one of the solutions against the problem of controlling a load. Force control systems using reaction force observer often assume that motors contact with the stationary environment. However, the environmental position varies during a wear Test. Therefore, the disturbance force due to this variation has to be considered in the reaction force observer. This paper shows that the environmental acceleration can be regarded as the disturbance force. Experimental results show the validity of the compensation in the reaction force observer using a miniature model of the rotary wear Test Apparatus.

G.j. Fishman - One of the best experts on this subject based on the ideXlab platform.

  • Results from the SIFTER (Scintillating Fiber Telescope for Energetic Radiation) beam Test Apparatus
    IEEE Transactions on Nuclear Science, 1999
    Co-Authors: R.m. Kippen, R.s. Mallozzi, K. Rielage, G.n. Pendleton, M.j. Christl, P.l. Hink, W.r. Binns, P. Dowkonti, J.w. Epstein, G.j. Fishman
    Abstract:

    The Scintillating Fiber Telescope for Energetic Radiation (SIFTER) is a large-area instrument concept for high-energy (E>10 MeV) gamma-ray astronomy. It takes advantage of the technology of fine (/spl sim/1 mm/sup 2/) plastic scintillating fibers in the context of a pair tracker/calorimeter telescope. In our on-going SIFTER research, we have developed a small Test Apparatus, consisting of 12 fiber planes, each with a potential active area of 10 cm/spl times/10 cm covered with a thin tantalum foil converter. This Apparatus was Tested in July, 1998 with high-energy photons (/spl sim/0.5-1.6 GeV) at the Thomas Jefferson National Accelerator Laboratory Hall B tagged gamma-ray facility. We report on results of the beam Test, concentrating on comparisons with detailed Monte Carlo simulations of the instrument performance, including track reconstruction, angular resolution and detection efficiency.

  • Simulations and preliminary results from the SIFTER (scintillating fiber telescope for energetic radiation) beam Test Apparatus
    1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255), 1998
    Co-Authors: R.m. Kippen, R.s. Mallozzi, K. Rielage, G.n. Pendleton, P.l. Hink, W.r. Binns, G.a. Richardson, M.h. Israel, J.h. Buckley, G.j. Fishman
    Abstract:

    The Scintillating Fiber Telescope for Energetic Radiation (SIFTER) is a large-area instrument concept for high-energy (E>10 MeV) gamma-ray astronomy. It takes advantage of the technology of fine (/spl sim/1 mm/sup 2/) plastic scintillating fibers in the context of a pair tracker/calorimeter telescope. In our on-going SIFTER research, we have developed a small Test Apparatus, consisting of 12 fiber planes, each with a potential active area of 10 cm/spl times/10 cm covered with a thin tantalum foil converter. This Apparatus has been Tested with high-energy photons (/spl sim/0.5-1.6 GeV) at the Thomas Jefferson National Accelerator Laboratory Hall B tagged gamma-ray facility. We report on the preliminary beam Test results, concentrating on comparisons with detailed Monte Carlo simulations of the instrument performance, including track reconstruction, angular resolution and detection efficiency.

Minoru Yokoyama - One of the best experts on this subject based on the ideXlab platform.

  • Reduction of Contact Force Fluctuation for Rotary Wear Test Apparatus
    IEEE ASME Transactions on Mechatronics, 2020
    Co-Authors: Minoru Yokoyama, Tomoyuki Shimono, Chikara Yamashita, Sei Nagasaka, Takuya Ohara
    Abstract:

    In electric railway systems, wear of current collector devices leads to high maintenance cost. To develop a cost reduction methodology, the wear behavior of current collector materials needs to be fully investigated. However, the wear Test Apparatuses currently in use cannot control the contact force between materials, and the contact force fluctuates. It is difficult to classify accurate conditions of a wear transition under contact force fluctuation. To solve this problem, we propose a force control system with acceleration and velocity feedbacks to suppress the force fluctuation. The positive feedback of acceleration compensates the periodic force fluctuation at frequencies according to the sliding velocity of rubbing surfaces. The velocity feedback compensates the force fluctuation caused by resonance. The proposed control system is validated by experiments using a prototype of a rotary wear Test Apparatus.

  • Feasibility study on application of force control to wear Test Apparatus for contact current collection system
    2016 IEEE International Power Electronics and Motion Control Conference (PEMC), 2016
    Co-Authors: Minoru Yokoyama, Tomoyuki Shimono, Chikara Yamashita, Sei Nagasaka, Takuya Ohara
    Abstract:

    In wear Tests under high speed conditions for the contact current collection system of electric trains, a load given to materials fluctuates largely. This fluctuation disturbs the accurate measurement of the wear mode transition. Force control is one of the solutions against the problem of controlling a load. Force control systems using reaction force observer often assume that motors contact with the stationary environment. However, the environmental position varies during a wear Test. Therefore, the disturbance force due to this variation has to be considered in the reaction force observer. This paper shows that the environmental acceleration can be regarded as the disturbance force. Experimental results show the validity of the compensation in the reaction force observer using a miniature model of the rotary wear Test Apparatus.

R.m. Kippen - One of the best experts on this subject based on the ideXlab platform.

  • Results from the SIFTER (Scintillating Fiber Telescope for Energetic Radiation) beam Test Apparatus
    IEEE Transactions on Nuclear Science, 1999
    Co-Authors: R.m. Kippen, R.s. Mallozzi, K. Rielage, G.n. Pendleton, M.j. Christl, P.l. Hink, W.r. Binns, P. Dowkonti, J.w. Epstein, G.j. Fishman
    Abstract:

    The Scintillating Fiber Telescope for Energetic Radiation (SIFTER) is a large-area instrument concept for high-energy (E>10 MeV) gamma-ray astronomy. It takes advantage of the technology of fine (/spl sim/1 mm/sup 2/) plastic scintillating fibers in the context of a pair tracker/calorimeter telescope. In our on-going SIFTER research, we have developed a small Test Apparatus, consisting of 12 fiber planes, each with a potential active area of 10 cm/spl times/10 cm covered with a thin tantalum foil converter. This Apparatus was Tested in July, 1998 with high-energy photons (/spl sim/0.5-1.6 GeV) at the Thomas Jefferson National Accelerator Laboratory Hall B tagged gamma-ray facility. We report on results of the beam Test, concentrating on comparisons with detailed Monte Carlo simulations of the instrument performance, including track reconstruction, angular resolution and detection efficiency.

  • Simulations and preliminary results from the SIFTER (scintillating fiber telescope for energetic radiation) beam Test Apparatus
    1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255), 1998
    Co-Authors: R.m. Kippen, R.s. Mallozzi, K. Rielage, G.n. Pendleton, P.l. Hink, W.r. Binns, G.a. Richardson, M.h. Israel, J.h. Buckley, G.j. Fishman
    Abstract:

    The Scintillating Fiber Telescope for Energetic Radiation (SIFTER) is a large-area instrument concept for high-energy (E>10 MeV) gamma-ray astronomy. It takes advantage of the technology of fine (/spl sim/1 mm/sup 2/) plastic scintillating fibers in the context of a pair tracker/calorimeter telescope. In our on-going SIFTER research, we have developed a small Test Apparatus, consisting of 12 fiber planes, each with a potential active area of 10 cm/spl times/10 cm covered with a thin tantalum foil converter. This Apparatus has been Tested with high-energy photons (/spl sim/0.5-1.6 GeV) at the Thomas Jefferson National Accelerator Laboratory Hall B tagged gamma-ray facility. We report on the preliminary beam Test results, concentrating on comparisons with detailed Monte Carlo simulations of the instrument performance, including track reconstruction, angular resolution and detection efficiency.

Tomoyuki Shimono - One of the best experts on this subject based on the ideXlab platform.

  • Reduction of Contact Force Fluctuation for Rotary Wear Test Apparatus
    IEEE ASME Transactions on Mechatronics, 2020
    Co-Authors: Minoru Yokoyama, Tomoyuki Shimono, Chikara Yamashita, Sei Nagasaka, Takuya Ohara
    Abstract:

    In electric railway systems, wear of current collector devices leads to high maintenance cost. To develop a cost reduction methodology, the wear behavior of current collector materials needs to be fully investigated. However, the wear Test Apparatuses currently in use cannot control the contact force between materials, and the contact force fluctuates. It is difficult to classify accurate conditions of a wear transition under contact force fluctuation. To solve this problem, we propose a force control system with acceleration and velocity feedbacks to suppress the force fluctuation. The positive feedback of acceleration compensates the periodic force fluctuation at frequencies according to the sliding velocity of rubbing surfaces. The velocity feedback compensates the force fluctuation caused by resonance. The proposed control system is validated by experiments using a prototype of a rotary wear Test Apparatus.

  • Feasibility study on application of force control to wear Test Apparatus for contact current collection system
    2016 IEEE International Power Electronics and Motion Control Conference (PEMC), 2016
    Co-Authors: Minoru Yokoyama, Tomoyuki Shimono, Chikara Yamashita, Sei Nagasaka, Takuya Ohara
    Abstract:

    In wear Tests under high speed conditions for the contact current collection system of electric trains, a load given to materials fluctuates largely. This fluctuation disturbs the accurate measurement of the wear mode transition. Force control is one of the solutions against the problem of controlling a load. Force control systems using reaction force observer often assume that motors contact with the stationary environment. However, the environmental position varies during a wear Test. Therefore, the disturbance force due to this variation has to be considered in the reaction force observer. This paper shows that the environmental acceleration can be regarded as the disturbance force. Experimental results show the validity of the compensation in the reaction force observer using a miniature model of the rotary wear Test Apparatus.

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