Korea – Anti-Dumping Duties on Pneumatic Valves From Japan

2021 ◽  
pp. 5935-6264
Keyword(s):  
Pneumatic Valves

scholarly journals Active Passive Nature of Assistive Wearable Gait Augment Suit for Enhanced Mobility

2018 ◽  
Vol 30 (5) ◽  
pp. 717-728 ◽  
Author(s):  
Chetan Thakur ◽  
Kazunori Ogawa ◽  
Yuichi Kurita ◽  
◽  
◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Feedforward Control ◽  
Surface Emg ◽  
Walking Gait ◽  
Lower Limb Muscles ◽  
Air Supply ◽  
Pilot Trials ◽  
Pneumatic Valves ◽  
Enhanced Mobility

In this paper we discuss the active and passive nature of the assistive wearable gait augment suit (AWGAS). AWGAS is a soft, wearable, lightweight, and assists walking gait by reducing muscle activation during walking. It augments walking by reducing the muscle activation of the posterior and anterior muscles of the lower limb. The suit uses pneumatic gel muscles (PGM), foot sensors for gait detection, and pneumatic valves to control the air pressure. The assistive force is provided using the motion in loop feedforward control loop using foot sensors in shoes. PGMs are actuated with the help of pneumatic valves and portable air tanks. The elastic nature of the PGM allows AWGAS to assist walking in the absence of the air supply which makes AWGAS both active and passive walking assist suit. To evaluate the active and passive nature of the AWGAS, we experimented to measure surface EMG (sEMG) of the lower limb muscles. sEMG was recorded for unassisted walking, i.e., without the suit, passive assisted walking, i.e., wearing the suit with no air supply and active assisted walking, i.e., wearing the suit with air supply set at 60 kPa. The results shows reduction in the muscle activity for both passive and active assisted walking as compared to unassisted walking. The pilot trials of the AWGAS were conducted in collaboration with local farmers in the Hiroshima prefecture in Japan where feedback received is complementing the results obtained during the experiments.

Characteristics of Experimental MSMA-Based Pneumatic Valves

2013 ◽  
Author(s):  
Stanislaw Flaga ◽  
Andrzej Sioma
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Initial Study ◽  
General Construction ◽  
Linear Actuator ◽  
Magnetic Shape Memory ◽  
Electromechanical Transducer ◽  
One Stage ◽  
Magnetic Shape Memory Alloy ◽  
Pneumatic Valves

In the course of work on a linear actuator based on a magnetic shape memory alloy (MSMA), a research workstation was constructed enabling the examination of pneumatic valves featuring an electromechanical transducer created with MSMA technology. In this article, the general construction of the research workstation is presented, together with an initial study of a demonstrator of a pneumatic, one-stage, one-way throttle valve. In the presented demonstrator, a simple replacement of a electromechanical transducer into a transducer created with MSMA technology was performed. In addition, the study also describes the problems appearing in such structures along with potential troubleshooting methods.

scholarly journals Design of a pressure modulator using fast-acting bistable valves

2020 ◽  
pp. 095440622094420
Author(s):  
L Henderson ◽  
D Cebon
Keyword(s):  
Design Method ◽  
Detection Algorithm ◽  
Chamber Pressure ◽  
Low Friction ◽  
Vehicle Performance ◽  
Braking Performance ◽  
Straight Line ◽  
Pneumatic Valves ◽  
Pressure Observer ◽  
Fast Acting

Fast-acting pneumatic valves, combined with a slip-control braking algorithm, have recently been used to improve the straight-line braking performance of an experimental heavy goods vehicle, on low friction roads, by 16%. This paper describes how the fast-acting valves, which were central to the aforementioned research, were designed for use on a commercial vehicle. Design equations, as well as a generalized design method, are first presented for the fast-acting bistable pneumatic valve. A pressure observer is developed to predict the brake chamber pressure in cases where a pressure transducer is mounted upstream. A simple fault detection algorithm is then introduced, which utilizes some of the calculations made in the pressure observer, and is shown to correctly identify faults on a real vehicle. Performance comparisons are made between the new modulator and a conventional heavy goods vehicle electro-pneumatic brake system. Closed-loop frequency response tests show that the control bandwidth of brake chamber pressure on a heavy goods vehicle can be increased from 1.5 Hz to 10 Hz using the new hardware.

scholarly journals Fabrication of a Pneumatic Microparticle Concentrator

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 40
Author(s):  
Jun Ho Jang ◽  
Ok Chan Jeong
Keyword(s):  
Three Dimensional ◽  
Fem Simulation ◽  
Particle Diameter ◽  
Microfluidic Channel ◽  
Solid Particles ◽  
Working Fluid ◽  
Operating Pressure ◽  
Fluidic Channel ◽  
Outlet Port ◽  
Pneumatic Valves

We developed a microfluidic platform employing (normally open) pneumatic valves for particle concentration. The device features a three-dimensional network with a curved fluidic channel and three pneumatic valves (a sieve valve (Vs) that concentrates particles and two ON/OFF rubber-seal pneumatic valves that block the working fluid). Double-sided replication employing polydimethylsiloxane (PDMS) was used to fabricate the network, channel, and chamber. Particles were blocked by deformation of the Vs diaphragm, and then accumulated in the curved microfluidic channel. The working fluid was discharged via operation of the two ON/OFF valves. After concentration, particles were released to an outlet port. The Vs pressure required to block solid particles varying in diameter was determined based on the height of the curved microchannel and a finite element method (FEM) simulation of Vs diaphragm displacement. Our method was verified according to the temporal response of the fluid flow rate controlled by the pneumatic valves. Furthermore, all particles with various diameters were successfully blocked, accumulated, and released. The operating pressure, time required for concentration, and concentration ratio were dependent on the particle diameter. The estimated concentration percentage of 24.9 µm diameter polystyrene particles was about 3.82% for 20 min of operation.

scholarly journals Coupling Microdialysis Sampling to Microchip Electrophoresis in a Reversibly Sealed Device

2007 ◽  
Vol 12 (5) ◽  
pp. 296-302 ◽  
Author(s):  
Laura C. Mecker ◽  
R. Scott Martin
Keyword(s):  
Lag Time ◽  
Microchip Electrophoresis ◽  
Entire System ◽  
Electrophoretic Separation ◽  
Microdialysis Sampling ◽  
Microdialysis Probe ◽  
Pneumatic Valves ◽  
Repeated Use ◽  
Fabrication And Characterization

In this article, we describe the fabrication and characterization of a reversibly sealed microchip device that is used to couple microdialysis sampling to microchip electrophoresis. The ability to interface microdialysis sampling and microchip electrophoresis in a device that is amenable to reversible sealing is advantageous from a repeated use standpoint. Commercially, available tubing coming from the microdialysis probe is directly inserted into the chip and flow from the probe is interfaced to the electrophoresis portion of the device through integrated pneumatic valves. Fluorescence detection was used to characterize the poly(dimethylsiloxane)-based device in terms of injection reproducibility. It was found that the entire system (microdialysis probe and microchip device) has a concentration response lag time of 170 s. Microdialysis sampling followed by an electrophoretic separation of amino acids derivatized with naphthalene-2,3-dicarboxaldehyde/cyanide was also demonstrated.

Reversible thermo-pneumatic valves on centrifugal microfluidic platforms

Lab on a Chip ◽  
2015 ◽  
Vol 15 (16) ◽  
pp. 3358-3369 ◽  
Author(s):  
Mohammad Mahdi Aeinehvand ◽  
Fatimah Ibrahim ◽  
Sulaiman Wadi Harun ◽  
Amin Kazemzadeh ◽  
Hussin A. Rothan ◽  
...  
Keyword(s):  
Dengue Virus ◽  
Thermal Energy ◽  
Microfluidic Platforms ◽  
Pneumatic Valves ◽  
Multiple Pcr

Reversible thermo-pneumatic valves (RTPVs) manipulate thermal energy to reversibly block or open microchannels. The valves prevent the evaporation of reagents during thermocycling periods. The cartridge is used for sequential aliquoting to prepare multiple PCR reaction mixtures for the detection of the Dengue virus.

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