The Experts below are selected from a list of 14262 Experts worldwide ranked by ideXlab platform

Takefumi Kanda - One of the best experts on this subject based on the ideXlab platform.

  • a small three way Valve for hydraulic actuators using piezoelectric transducers
    Internaltional Ultrasonics Symposium, 2017
    Co-Authors: Hayato Osaki, Koichi Suzumori, Takefumi Kanda, Shoki Ofuji, Norihisa Seno, Takahiro Ukida, Hiroyuki Nabae
    Abstract:

    Hydraulic actuators has been utilized for various types of robots. However, hydraulic Control system for multiple degrees of freedom mechanisms has a large volume because such system needs many Control components. The purpose of this research is to develop a small hydraulic Flow Control Valve. In the previous research, we have developed a small Flow Control Valve using particle excitation by a piezoelectric transducer [1], and applied this Valve to a hydraulic system. In this research, we have fabricated and evaluated a small three-way Valve for further miniaturization.

  • Development of Novel Particle Excitation Flow Control Valve for Stable Flow Characteristics
    International Journal of Automation Technology, 2016
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Tomomi Yamaguchi, Naomichi Furushiro, Takefumi Kanda
    Abstract:

    The authors have previously developed a compact, light-weight air Flow Control Valve, which realizes continuous Flow Control. The vibration produced by a piezoelectric device (PZT) was used to excite particles confined in a Flow channel to Control the Valve opening for the developed Control Valve. Therefore, the voltage applied to the PZT can be changed to continuously Control the Flow rate. A new working principle was developed for the Control Valve to stabilize Flow rate characteristics. Different types of particles were used to change the Valve opening condition. A prototype was manufactured to demonstrate the effectiveness of the Control Valve.

  • Design and evaluation of orifice arrangement for particle-excitation Flow Control Valve
    Sensors and Actuators A: Physical, 2011
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Takefumi Kanda
    Abstract:

    Abstract In this article, we report a new particle-excitation Flow Control Valve. The purpose of this study is the development of a particle-excitation Flow Control Valve that can precisely Control pneumatic cylinders. We have reported this Flow Control Valve principle. The Valve, driven by a PZT vibrator, has a simple lightweight structure with large Flow rate. We report the relationship between the orifice arrangement and Flow rate characteristics of the Valve. We have designed a new prototype for the purpose of high Controllability. We have measured Flow-rate characteristics and confirmed the conditions necessary for continuous adjustment of Flow quantity. The Control Valve works successfully to realize a change in Flow rate.

  • Dynamic characteristics of pneumatic Flow Control Valve driven by PZT vibrator
    2010
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Takefumi Kanda
    Abstract:

    Pneumatic actuators have several advantages, which are high compliance, light weight, safety, and low-cost. Valve that can realize a continuous Flowing quantity Control is necessary to Control pneumatic actuators precisely, while in general, such a Valve is large. This study aims at the development of a new Flow Control Valve that has a lightweight and simple structure can Control Flow-rate continuously. This Valve uses piezoelectric transducer which is driven at resonance mode and it can Control Flow-rate by Controlling the amplitude of the particles excitation. The Flow Control Valve in this report is 10 mm in diameter, 9 mm in height and 2.5 g. We had already achieved ON/OFF Control of large Flowing quantity with the Valve. In this report, we research dynamic characteristics of the Valve. As the results of experiments, we found that the Valve response time is 29 ms and Flow rate change is almost equal to Control signal.

  • Experimental analysis on pneumatic Flow Control Valve driven by PZT vibrator
    2010 IEEE ASME International Conference on Advanced Intelligent Mechatronics, 2010
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Takefumi Kanda
    Abstract:

    Recently, pneumatic actuators are widely used in the automation machine equipments because they are simple, lightweight, and highly compliant. Valve that can realize a continuous Flowing quantity Control is necessary to Control air actuators precisely, while in general, such a Valve is large. This study aims at the development of a new Flow Control Valve that has a lightweight and simple structure and uses piezoelectric oscillator which is driven at resonance mode and it can Control Flow-rate by Controlling the amplitude of the particles excitation. The Flow Control Valve in this report is 10 mm in diameter and 9 mm in height. We had already achieved ON/OFF Control of large Flowing quantity with the Valve. In this report, we research dynamic characteristics and properties under high air pressure. As the results of experiments, we found that the Valve response time is 29 ms and the Valve vibration property changed under air pressure. We confirmed its mechanism and found condition to Control Flow rate continuously.

Piascik, Robert S. - One of the best experts on this subject based on the ideXlab platform.

  • Space Shuttle Program (SSP) Orbiter Main Propulsion System (MPS) Gaseous Hydrogen (GH2) Flow Control Valve (FCV) Poppet Eddy Current (EC) Inspection Probability of Detection (POD) Study
    2011
    Co-Authors: Prosser, William H., Piascik, Robert S.
    Abstract:

    The Director of the NASA Engineering and Safety Center (NESC), requested an independent assessment of the anomalous gaseous hydrogen (GH2) Flow incident on the Space Shuttle Program (SSP) Orbiter Vehicle (OV)-105 during the Space Transportation System (STS)-126 mission. The main propulsion system (MPS) engine #2 GH2 Flow Control Valve (FCV) LV-57 transition from low towards high Flow position without being commanded. Post-flight examination revealed that the FCV LV-57 poppet had experienced a fatigue failure that liberated a section of the poppet flange. The NESC assessment provided a peer review of the computational fluid dynamics (CFD), stress analysis, and impact testing. A probability of detection (POD) study was requested by the SSP Orbiter Project for the eddy current (EC) nondestructive evaluation (NDE) techniques that were developed to inspect the flight FCV poppets. This report contains the Appendices to the main report

  • Space Shuttle Program (SSP) Orbiter Main Propulsion System (MPS) Gaseous Hydrogen (GH2) Flow Control Valve (FCV) Poppet Eddy Current (EC) Inspection Probability of Detection (POD) Study
    2011
    Co-Authors: Prosser, William H., Piascik, Robert S.
    Abstract:

    The Director of the NASA Engineering and Safety Center (NESC), requested an independent assessment of the anomalous gaseous hydrogen (GH2) Flow incident on the Space Shuttle Program (SSP) Orbiter Vehicle (OV)-105 during the Space Transportation System (STS)-126 mission. The main propulsion system (MPS) engine #2 GH2 Flow Control Valve (FCV) LV-57 transition from low towards high Flow position without being commanded. Post-flight examination revealed that the FCV LV-57 poppet had experienced a fatigue failure that liberated a section of the poppet flange. The NESC assessment provided a peer review of the computational fluid dynamics (CFD), stress analysis, and impact testing. A probability of detection (POD) study was requested by the SSP Orbiter Project for the eddy current (EC) nondestructive evaluation (NDE) techniques that were developed to inspect the flight FCV poppets. This report contains the findings and recommendations from the NESC assessment

Ł. Mika - One of the best experts on this subject based on the ideXlab platform.

  • Ice slurry Flow in a poppet-type Flow Control Valve
    Experimental Thermal and Fluid Science, 2013
    Co-Authors: Ł. Mika
    Abstract:

    Abstract The paper presents the results of experimental studies of the Flow resistance of ice slurry in a poppet-type Flow Control Valve with a diameter of 20 mm. The studies found that the usable regulation range of the Valve decreases as the content of ice particles in the slurry rises. The paper draws on a simulation calculation model and 10 geometric models of the Valve (for various locations of the poppet) in order to optimize the characteristics of the Valve. Using the simulation model of the Valve, later verified by experimental studies, changes in the construction of the Valve were considered, which could improve its regulation capability for the Flow of ice slurry with a content of ice particles ranging from 5% to 20%. During simulation studies, the influence of a cylindrical shape of the poppet with diameters between 18.5 mm and 19.6 mm and a conical shape, with the angle between the generators ranging from 0° to 15°, on the characteristics of the Valve was examined. The studies also covered the impact of the degree of edge bevelling of the poppet within the range of 0–1.5 mm. Changes in the characteristics of the poppet resulting from simulation calculations were verified in experimental studies of the modified shape of the poppet.

S.m.r. Ziaei - One of the best experts on this subject based on the ideXlab platform.

  • Failure Analysis: Sulfide Stress Corrosion Cracking and Hydrogen-Induced Cracking of A216-WCC Wellhead Flow Control Valve Body
    Journal of Failure Analysis and Prevention, 2014
    Co-Authors: S.m.r. Ziaei, A.h. Kokabi, J. Mostowfi
    Abstract:

    The wellhead Flow Control Valve bodies which are the focal point of this failure case study were installed in some of the upstream facilities of Khangiran’s sour gas wells. These Valve bodies have been operating satisfactorily for 3 years in wet H_2S environment before some pits and cracks were detected in all of them during the periodical technical inspections. One failed Valve body was investigated by chemical and microstructural analytical techniques to find out the failure cause and provide preventive measures. The Valve body alloy was A216-WCC cast carbon steel. During investigation many cracks were observed on the inner surface of the Valve body grown from the surface pits. The results indicate that Flow Control Valve body failed due to combination of hydrogen-induced corrosion cracking and sulfide stress corrosion cracking. According to HIC and SSC laboratory tests and also with regard to cost of engineering materials, it was evident that the best alternative for the Valve body alloy is A217-WC9 cast Cr–Mo steel.

  • Sulfide stress corrosion cracking and hydrogen induced cracking of A216-WCC wellhead Flow Control Valve body
    Case Studies in Engineering Failure Analysis, 2013
    Co-Authors: S.m.r. Ziaei, A.h. Kokabi, M. Nasr-esfehani
    Abstract:

    Abstract The wellhead Flow Control Valve bodies which are the focal point of this failure case study were installed in some of the upstream facilities of Khangiran's sour gas wells. These Valve bodies have been operating satisfactorily for 3 years in wet H 2 S environment before some pits and cracks were detected in all of them during the periodical technical inspections. One failed Valve body was investigated by chemical and microstructural analytical techniques to find out the failure cause and provide preventive measures. The Valve body alloy was A216 -WCC cast carbon steel. During investigation many cracks were observed on the inner surface of the Valve body grown from the surface pits. The results indicate that Flow Control Valve body failed due to combination of hydrogen induced corrosion cracking (HICC) and sulfide stress corrosion cracking (SSCC). According to HIC and SSC laboratory tests and also with regard to cost of engineering materials, it was evident that the best alternative for the Valve body alloy is A217 -WC9 cast Cr–Mo steel.

Daisuke Hirooka - One of the best experts on this subject based on the ideXlab platform.

  • Development of Novel Particle Excitation Flow Control Valve for Stable Flow Characteristics
    International Journal of Automation Technology, 2016
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Tomomi Yamaguchi, Naomichi Furushiro, Takefumi Kanda
    Abstract:

    The authors have previously developed a compact, light-weight air Flow Control Valve, which realizes continuous Flow Control. The vibration produced by a piezoelectric device (PZT) was used to excite particles confined in a Flow channel to Control the Valve opening for the developed Control Valve. Therefore, the voltage applied to the PZT can be changed to continuously Control the Flow rate. A new working principle was developed for the Control Valve to stabilize Flow rate characteristics. Different types of particles were used to change the Valve opening condition. A prototype was manufactured to demonstrate the effectiveness of the Control Valve.

  • Design and evaluation of orifice arrangement for particle-excitation Flow Control Valve
    Sensors and Actuators A: Physical, 2011
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Takefumi Kanda
    Abstract:

    Abstract In this article, we report a new particle-excitation Flow Control Valve. The purpose of this study is the development of a particle-excitation Flow Control Valve that can precisely Control pneumatic cylinders. We have reported this Flow Control Valve principle. The Valve, driven by a PZT vibrator, has a simple lightweight structure with large Flow rate. We report the relationship between the orifice arrangement and Flow rate characteristics of the Valve. We have designed a new prototype for the purpose of high Controllability. We have measured Flow-rate characteristics and confirmed the conditions necessary for continuous adjustment of Flow quantity. The Control Valve works successfully to realize a change in Flow rate.

  • Dynamic characteristics of pneumatic Flow Control Valve driven by PZT vibrator
    2010
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Takefumi Kanda
    Abstract:

    Pneumatic actuators have several advantages, which are high compliance, light weight, safety, and low-cost. Valve that can realize a continuous Flowing quantity Control is necessary to Control pneumatic actuators precisely, while in general, such a Valve is large. This study aims at the development of a new Flow Control Valve that has a lightweight and simple structure can Control Flow-rate continuously. This Valve uses piezoelectric transducer which is driven at resonance mode and it can Control Flow-rate by Controlling the amplitude of the particles excitation. The Flow Control Valve in this report is 10 mm in diameter, 9 mm in height and 2.5 g. We had already achieved ON/OFF Control of large Flowing quantity with the Valve. In this report, we research dynamic characteristics of the Valve. As the results of experiments, we found that the Valve response time is 29 ms and Flow rate change is almost equal to Control signal.

  • Experimental analysis on pneumatic Flow Control Valve driven by PZT vibrator
    2010 IEEE ASME International Conference on Advanced Intelligent Mechatronics, 2010
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Takefumi Kanda
    Abstract:

    Recently, pneumatic actuators are widely used in the automation machine equipments because they are simple, lightweight, and highly compliant. Valve that can realize a continuous Flowing quantity Control is necessary to Control air actuators precisely, while in general, such a Valve is large. This study aims at the development of a new Flow Control Valve that has a lightweight and simple structure and uses piezoelectric oscillator which is driven at resonance mode and it can Control Flow-rate by Controlling the amplitude of the particles excitation. The Flow Control Valve in this report is 10 mm in diameter and 9 mm in height. We had already achieved ON/OFF Control of large Flowing quantity with the Valve. In this report, we research dynamic characteristics and properties under high air pressure. As the results of experiments, we found that the Valve response time is 29 ms and the Valve vibration property changed under air pressure. We confirmed its mechanism and found condition to Control Flow rate continuously.

  • Flow Control Valve for pneumatic actuators using particle excitation by pzt vibrator
    Sensors and Actuators A-physical, 2009
    Co-Authors: Daisuke Hirooka, Koichi Suzumori, Takefumi Kanda
    Abstract:

    This paper reports a new Flow Control Valve for pneumatic actuators that has a lightweight and simple structure and uses particle excitation by PZT vibrator. The Flow Control Valve in this report consists of an orifice plate which has plural orifices, PZT vibrator which is adhered on the orifice plate and iron particles. The Valve is normally closed, because air Flow carries the particles on to the orifice and particles seal the air Flow. Because the orifice plate excitation by the PZT vibrator works to make the particles away from the orifice plate, the air Flows through the orifices. It is driven at resonance mode and can be used as a variable speed Controller for pneumatic actuators. The new Flow Control Valve avoids the stopping shock of pneumatic actuators at the stroke ends while retaining the advantages of pneumatic actuators.