scholarly journals An ER Microactuator with Built-in Pump and Valve

2012 ◽  
Vol 6 (4) ◽  
pp. 468-475 ◽  
Author(s):  
Kazuhiro Yoshida ◽  
◽  
Tomohisa Muto ◽  
Joon-Wan Kim ◽  
Shinichi Yokota
Keyword(s):  
Electric Field ◽  
Apparent Viscosity ◽  
Check Valve ◽  
High Viscosity ◽  
Inertia Effect ◽  
Fluid Inertia ◽  
Viscosity Increase ◽  
Reed Valve ◽  
Fluid Inertia Effect ◽  
High Output

The paper presents a 3-DOF microactuator having a Fluid Inertia (FI) micropump and ER microvalves for in-pipe working micromachines of about 10 mm in diameter, and so on. The ER microvalve controls an Electro-Rheological Fluid (ERF) flow due to the apparent viscosity increase in the electric field. The FI micropump generates high-output-fluid power using the fluid inertia effect in an outlet pipe. First, the 3-DOF ER microactuator with built-in pump and valves was proposed, and its construction was clarified. Second, in order to pump high viscosity fluids such as ERFs, a multi-reed valve was proposed for the inlet check valve of the FI micropump. The characteristics of the newly-devised pump were clarified through simulation and experiments. Then, based on the results, a 10 mm-diameter FI micropump was successfully developed. Finally, in the first stage of this study, a 1-DOF valve-integrated ER microactuator was designed and fabricated. The validity of the actuator with the fabricated 10 mm-diameter FI micropump was experimentally confirmed.

758 High Viscosity Fluid Pumping by Micro Fluid Power Source Using Fluid Inertia Effect in Pipe

2006 ◽  
Vol 2006 (0) ◽  
pp. 197-198
Author(s):  
Kazuhiro YOSHIDA ◽  
Takeshi SETO ◽  
Shinichi YOKOTA ◽  
Yohei OSANAI ◽  
Kunihiko TAKAGI
Keyword(s):  
High Viscosity ◽  
Power Source ◽  
Fluid Power ◽  
Inertia Effect ◽  
Fluid Inertia ◽  
Fluid Inertia Effect ◽  
Viscosity Fluid

Fluid inertia effect on the spiral-grooved mechanical face seals considering cavitation effect

2020 ◽  
pp. 1-20
Author(s):  
Xuezhong Ma ◽  
Xiangkai Meng ◽  
Yuming Wang ◽  
Yangyang Liang ◽  
Xudong Peng
Keyword(s):  
Inertia Effect ◽  
Fluid Inertia ◽  
Cavitation Effect ◽  
Face Seals ◽  
Fluid Inertia Effect

A Mathematical Analog for Determination of Porous Annular Disk Squeeze Film Behavior Including the Fluid Inertia Effect

1972 ◽  
Vol 94 (2) ◽  
pp. 417-421 ◽  
Author(s):  
L. L. Ting
Keyword(s):  
Squeeze Film ◽  
Inertia Effect ◽  
Fluid Inertia ◽  
Annular Disk ◽  
Inertia Parameter ◽  
Permeability Parameter ◽  
Fluid Inertia Effect ◽  
Annular Disks ◽  
Range Of Values

A simple mathematical analog for determination of the squeeze film behavior between two parallel annular disks, one having a porous facing, from the already available solutions of comparable nonporous disks is presented. A comparison of the analog solution with a Fourier-Bessel solution has been made and the agreement is found to be good for a range of values of the permeability parameter and the porous facing thickness. The results also have been extended to include the rotating inertia effect of the film fluid. The resulting dimensionless pressure distribution and the dimensionless squeeze film load are expressed in terms of a permeability parameter, inertia parameter, squeeze film number, and the disk dimensions. For constant squeeze film load, a relationship between squeeze time and film thickness also has been obtained. Generally, the presence of the porous facing will decrease the squeeze film load and will reduce the total squeeze time to some finite value. The inertia effect will further decrease the squeeze film load and the squeeze time, however, the squeeze time reduction due to the inertia effect will become small if the porous facing has high permeability and is thick.

4105 Development of a full-wave rectifying piezoelecteic micropump using fluid inertia effect in pipes

2006 ◽  
Vol 2006.4 (0) ◽  
pp. 117-118
Author(s):  
Kazuhiro YOSHIDA ◽  
Keita SUGIURA ◽  
Takeshi SETO ◽  
Kunihiko TAKAGI ◽  
Shinichi YOKOTA
Keyword(s):  
Inertia Effect ◽  
Fluid Inertia ◽  
Full Wave ◽  
Fluid Inertia Effect

Aeroelastic Flutter of a Rotating Disk in an Unbounded Compressible Inviscid Fluid

2003 ◽  
Author(s):  
Anirban Jana ◽  
Arvind Raman
Keyword(s):  
Critical Speed ◽  
Mixed Boundary ◽  
Disk Surface ◽  
Radiation Damping ◽  
Inviscid Fluid ◽  
Inertia Effect ◽  
Fluid Inertia ◽  
Dual Integral Equations ◽  
Aeroelastic Flutter ◽  
Fluid Inertia Effect

The aeroelastic flutter of an unbaffled flexible disk rotating in an unbounded fluid is investigated, by modeling the disk-fluid system as a rotating Kirchhoff plate coupled to irrotational flow of a compressible inviscid fluid. The fluid motions are governed by the wave equation of linear acoustics. Fluid-structure coupling is achieved between the disk and the fluid by means of the fluid loading on the disk and the velocity matching boundary conditions on the disk surface. A perturbed eigenvalue formulation is used to compute systematically the coupled system eigenvalues. A series solution is presented for the dual integral equations, arising from the mixed boundary value problem governing the fluid motions. It is found that two distinct aerodynamic effects occur — radiation damping into the surrounding fluid and added fluid inertia effect. Provided the disk has zero material damping, the radiation damping causes the flutter speed to coincide with the critical speed. This flutter instability is a degenerate bifurcation with eigenvalues crossing into the right half plane through the origin with zero speed. The added fluid inertia effect modifies the frequencies of the traveling waves but does not affect the critical speed.

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