Presenting virtual stiffness by modulating the perceived force profile with suction pressure

2014 ◽  
Author(s):  
Lope Ben Porquis ◽  
Daiki Maemori ◽  
Naohisa Nagaya ◽  
Masashi Konyo ◽  
Satoshi Tadokoro
Keyword(s):  
Suction Pressure ◽  
Force Profile ◽  
Perceived Force ◽  
Virtual Stiffness

Creating Virtual Stiffness by Modifying Force Profile of Base Object

2010 ◽  
pp. 111-116 ◽  
Author(s):  
Atsutoshi Ikeda ◽  
Yuichi Kurita ◽  
Takeshi Tamaki ◽  
Kazuyuki Nagata ◽  
Tsukasa Ogasawara
Keyword(s):  
Force Profile ◽  
Virtual Stiffness ◽  
Base Object

[D05] Presenting virtual stiffness with suction pressure

2014 ◽  
Author(s):  
Lope Ben Porquis ◽  
Daiki Maemori ◽  
Naohisa Nagaya ◽  
Masashi Konyo ◽  
Satoshi Tadokoro
Keyword(s):  
Suction Pressure ◽  
Virtual Stiffness

scholarly journals Measurement of Suction Pressure Generated in the Process of Frost Heaving in Rock

2017 ◽  
Vol 133 (2) ◽  
pp. 4-11
Author(s):  
Dai NAKAMURA ◽  
Takayuki KAWAGUCHI ◽  
Tatsuya WATANABE ◽  
Shunzo KAWAJIRI ◽  
Shintaro YAMASAKI ◽  
...  
Keyword(s):  
Suction Pressure ◽  
Frost Heaving

EXTRACTION OF MINUTE GAS BUBBLES FROM LIQUIDS FLOWING IN A SIMULATED CARDIOPULMONARY BYPASS SYSTEM BY A VENTURI-ASPIRATOR UNIT

2002 ◽  
Vol 02 (03n04) ◽  
pp. 297-312
Author(s):  
WEN-JEI YANG ◽  
AMR EID ◽  
R. ECHIGO
Keyword(s):  
Cardiopulmonary Bypass ◽  
Flow Rate ◽  
Whole Blood ◽  
Pressure Difference ◽  
Gas Bubbles ◽  
Blood Oxygenation ◽  
Straight Tube ◽  
Suction Pressure ◽  
Total Flow ◽  
Total Flow Rate

An experimental study is performed to extract minute gas bubbles from liquids flowing in a simulated cardiopulmonary bypass system using a Venturi-aspirator unit. In other words, oxygen bubbles in oxygenated blood are simulated by air bubbles in water with AP30 (about same viscosity as whole blood). This study is intended to determine the feasibility of using a Venturi aspirator unit to extract minute gas bubbles from a simulated cardiopulmonary bypass system. Testing of the Venturi-type bubble extraction is carried out using three different test sections. Two Venturis are used, and a straight tube configuration is used as a control. The two Venturis are similar, with the exception that one has a longer inlet cone which causes the entering liquid to accelerate at a slower rate. Results are obtained for effectiveness of the aspirator unit as functions of total flow rate, extraction suction, suction pressure difference, and hydraulic head. It is concluded from the study that:(i) The effectiveness of the Venturis is typically between 90 and 100 percent. It increases with an increase in suction or suction pressure difference but decreases with an increase in total flow rate.(ii) The Venturi is most suitable for extraction of minute gas bubbles, especially for use with AP30 (whole blood), which yields substantially higher effectiveness than water.(iii) It is anticipated that a Venturi-aspirator unit can be superior to other bubble separation device as the cardiopulmonary bypass system for applications in extra corporeal blood oxygenation.

scholarly journals Modelling the variation of suction pressure during caisson installation in sand using FLAC3D

2015 ◽  
Vol 12 (7) ◽  
pp. 893-899 ◽  
Author(s):  
Moura Mehravar ◽  
Ouahid Harireche ◽  
Asaad Faramarzi ◽  
Amir M. Alani
Keyword(s):  
Suction Pressure

Friction of outer rotor affecting friction torque characteristics in an internal gear pump

2014 ◽  
Vol 229 (16) ◽  
pp. 3013-3026 ◽  
Author(s):  
Yoshiharu Inaguma
Keyword(s):  
Pressure Distribution ◽  
Friction Force ◽  
Significant Loss ◽  
Friction Torque ◽  
The Body ◽  
Gear Pump ◽  
Suction Pressure ◽  
Outer Rotor ◽  
Internal Gear ◽  
Outer Circumference

This article presents the friction torque in an internal gear pump and the friction force between an outer circumference of an outer rotor and a body, which causes a significant loss, has been investigated. When in use at a high pressure, the pump has a large friction torque due to the friction force acting on the outer rotor circumference. This friction force is caused by imbalanced force acting on the outer rotor. As well as by a positioning suction and a delivery port, the force can be reduced by setting a suction pressure recess in a section of the outer rotor circumference. In this study, through the measurement of the friction torque in an actual pump and the pressure distribution on the outer circumference of the outer rotor, it is investigated how the suction pressure recess can change the force acting on the outer rotor. The actual internal gear pump without the suction pressure recess has a large friction torque, and it corresponds to a large force on the outer rotor, which is calculated from the pressure distributions on the inside and outside of the outer rotor. In addition, on the basis of the measured friction torque of the test pump and the force acting on the outer rotor, calculated using the results of the pressure distribution, the coefficient of friction between the outer rotor circumference and the body can be estimated.

scholarly journals Usefulness of High Suction Pressure for Sufficient Tissue Collection During Endobronchial Ultrasound Guided Transbronchial Needle Aspiration

PLoS ONE ◽  
2013 ◽  
Vol 8 (12) ◽  
pp. e82787 ◽  
Author(s):  
Takayuki Shiroyama ◽  
Norio Okamoto ◽  
Hidekazu Suzuki ◽  
Motohiro Tamiya ◽  
Tadahiro Yamadori ◽  
...  
Keyword(s):  
Needle Aspiration ◽  
Endobronchial Ultrasound ◽  
Suction Pressure ◽  
Ultrasound Guided ◽  
Transbronchial Needle Aspiration ◽  
High Suction

Virtual Tissue Cutting With Haptic Feedback Using a Hybrid Actuator With DC Servomotor and Magnetorheological Brake

2016 ◽  
Vol 16 (3) ◽  
Author(s):  
Berk Gonenc ◽  
Hakan Gurocak
Keyword(s):  
Haptic Feedback ◽  
Fast Response ◽  
Virtual Training ◽  
Tissue Properties ◽  
Tissue Cutting ◽  
Wide Range ◽  
Force Profile ◽  
Rat Tissue ◽  
Dc Servomotor ◽  
Hybrid Actuator

Surgical training is an important and recent application where haptic interfaces are used to enhance the realism of virtual training simulators. Tissue cutting with surgical scissors is a common interaction mode in the simulations. The haptic interface needs to render a wide range of tissue properties and resistance forces accurately. In this research, we developed a hybrid haptic device made of a DC servomotor and a magnetorheological (MR) brake. The motor can provide fast dynamic response and compensate for inertia and friction effects of the device. But alone, it cannot supply high force levels and the sensation of stiff interaction with hard tissues such as tendons. On the other hand, the MR-brake can provide very stiff interaction forces yet cannot reflect fast dynamics that are encountered as the virtual scissors go through the tissue. The hybrid actuator developed in this work combines the two based on a control scheme that decomposes the actuator command signal into two branches considering each actuator's capabilities. It is implemented on a compact single degree-of-freedom (DOF) interface to simulate virtual tissue cutting with three different scissor types (Mayo, Metzenbaum, Iris) and four types of rat tissue (liver, muscle, skin, tendon). Results have shown close tracking of the desired force profile in all cases. Compared to just using a DC motor, the hybrid actuator provided a wider range of forces (up to 18 N) with fast response to render quick force variations without any instability for all simulated tissue and scissor types.

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