Development of Wearable Pneumatic Actuator and Multiport Pressure Control Valve

2005 ◽  
Vol 17 (5) ◽  
pp. 529-536 ◽  
Author(s):  
Tetsuya Akagi ◽  
◽  
Shujiro Dohta
Keyword(s):  
Degrees Of Freedom ◽  
Force Feedback ◽  
Control Valve ◽  
Pressure Control ◽  
Pneumatic Actuator ◽  
Pneumatic Cylinder ◽  
Pneumatic Actuators ◽  
Care Systems ◽  
Active Research ◽  
Pressure Control Valve

Recently, force feedback devices in virtual reality and power assisted nursing care systems have received much attention and active research. Some involve an actuator and a driving device, such as a pneumatic cylinder and a control valve, worn by the user. Such devices must be compact, lightweight and flexible to avoid excessive load on and injury to the user. The purpose of our study is to develop a flexible and lightweight actuator which can be safe enough to be attached to the human body. We proposed new flexible pneumatic actuators that operate even if the actuator is deformed by external force. We tested a push-pull and flexible pneumatic actuator that moves straight and rotates. We proposed and developed a multiport pressure control valve that drives multiple wearable actuators while reducing the weight of the control valve for multiple degrees of freedom of motion.

scholarly journals The Miller tracheal cuff pressure control valve.

Anaesthesia ◽  
1993 ◽  
Vol 48 (4) ◽  
pp. 324-327 ◽  
Author(s):  
K. A. PAYNE ◽  
D. M. MILLER
Keyword(s):  
Cuff Pressure ◽  
Control Valve ◽  
Pressure Control ◽  
Pressure Control Valve ◽  
Tracheal Cuff

Suction Pressure Control Valve for Microneurosurgery

2020 ◽  
Vol 68 (3) ◽  
pp. 652
Author(s):  
DeepakK Jha ◽  
AbhijeetS Barath ◽  
OmP Thakur ◽  
Mayank Garg ◽  
Suryanarayanan Bhaskar
Keyword(s):  
Control Valve ◽  
Pressure Control ◽  
Suction Pressure ◽  
Pressure Control Valve

Development of Low-Cost Wearable Servo Valve Using Buckled Tube Driven by Servo Motor

2013 ◽  
Vol 393 ◽  
pp. 532-537 ◽  
Author(s):  
Abdul Nasir ◽  
Tetsuya Akagi ◽  
Shujiro Dohta ◽  
Ayumu Ono ◽  
Yusuke Masago
Keyword(s):  
Control System ◽  
Flow Rate ◽  
Position Control ◽  
Low Cost ◽  
Control Valve ◽  
Artificial Muscle ◽  
Pneumatic Actuators ◽  
Servo Valve ◽  
Precise Control ◽  
Care Systems

Recently, power assisted nursing care systems have received much attention and those researches have been done actively. In such a control system, an actuator and a control valve are mounted on the human body. Designing the system, the size and weight of the valve become serious concerns. The purpose of our study is to develop a small-sized, lightweight and low-cost servo valve for precise control using wearable pneumatic actuators. In this study, a low-cost wearable servo valve that can control the output flow rate by changing the twisted angle of the buckled tube in the servo valve is proposed and tested. The position control system of McKibben rubber artificial muscle using tested valve and embedded controller is also proposed and tested. As a result, we confirmed that the tested servo valve can control the flow rate in both supply and exhaust in an analog way. In addition, the estimated cost of the proposed valve can be reduced about 100 times cheaper (10 US Dollar) compared with the typical servo valve.

Modelling and Reducing Fuel Flow Pulsation of a Fuel-Metering System by Improving Response of the Pressure Control Valve During Pump Mode Switching in a Turbofan Engine

2019 ◽  
Author(s):  
Seiei Masuda ◽  
Fumio Shimizu ◽  
Masaki Fuchiwaki ◽  
Kazuhiro Tanaka
Keyword(s):  
Control Valve ◽  
Flow Region ◽  
Pressure Control ◽  
Low Flow ◽  
Mode Switching ◽  
Pump Mode ◽  
Turbofan Engine ◽  
Fuel Pump ◽  
Fuel Flow ◽  
Pressure Control Valve

Abstract In an aircraft turbofan engine, a fuel metering unit meters and supplies the required fuel to the engine according to the flight situation. When a centrifugal fuel pump (CFP) is used as the fuel pump, the ratio of hydraulic power per weight can be increased by raising the rated rotational speed, so the weight of the fuel pump can be decreased compared to when using a gear pump (GFP). There is an advantage that it can be reduced significantly. However, since the operating range of the fuel pump is wide, it is not effective to use CFP in an extremely low flow rate region because the fuel temperature rises due to its PQ characteristics and a large loss. Therefore, it is considered effective to combine CFP and GFP as pressure sources, and to use GFP in the low flow region and CFP in the high flow region. For that purpose, it is necessary to have a pump mode switching mechanism. The disadvantage in this case is that changing the pump mode causes a large pressure change of the fuel pressure source, which in turn causes fuel flow pulsations. There are three possible ways to solve this problem. The first method is to keep the differential pressure control valve (DPCV) unit response constant, which keeps the metering valve differential pressure constant in FMS. A second method is to remove high frequency components that the DPCV cannot follow pressure changes in the fuel control system. A third method is to keep the pressure difference between the two fuel sources small and to reduce the amplitude of the applied disturbance. In this paper, the first method, which makes DPCV response high response, is verified by modeling and simulation, and its effectiveness is confirmed.

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