نتایج جستجو برای: fluidic momentum controller
تعداد نتایج: 118383 فیلتر نتایج به سال:
In this paper, a fluidic biosensor with possibility to fabricate by Micro-Electro-Mechanical Systems (MEMS) technology is proposed for biomedical mass detection and lab-on-chip applications. This is designed by electromechanical coupling of harmonic micromechanical resonators with harmonic springers as a mechanical resonator array. It can disperse mechanical wave along the array by electrostati...
Enhancement of heat and mass transfer and decrease of energy dissipation are great necessities of the evolution of fluid flow devices. Utilizing oscillatory or pulsatile fluid flow for periodic disturbing of velocity and thermal boundary layers is one of the methods with exciting results. Passive methods of generating oscillatory flow are preferred to active methods because of simplicity, no ne...
The miniaturization of integrated fluidic processors affords extensive benefits for chemical and biological fields, yet traditional, monolithic methods of microfabrication present numerous obstacles for the scaling of fluidic operators. Recently, researchers have investigated the use of additive manufacturing or "three-dimensional (3D) printing" technologies - predominantly stereolithography - ...
This paper demonstrates the detailed analysis of Proportional-Integral (PI) controller and Fuzzy Logic controller for speed control of a Permanent Magnet Brushless DC (PMBLDC) motor for different speed commands and varying load torque conditions. Implementation of PI controller in closed loop conditions is done. Analysis of classical tuning methods to obtain best PI parameters for speed control...
This report describes a non-destructive fluidic memory device with associated fluidic alphanumeric display, developed by Giannini Controls Corporation under contract NAS 12-43 with NASA Electronics Research Center. The device uses the surface tension of a liquid bead in an hour-glassshaped cavity to achieve a bi-stable memory effect which does not require a continuous supply of fluid power. Thu...
Induction motors are the workhorses of industries. Indirect vector control scheme has been preferred due to its superior dynamic performance. Since the conventional PI controller has bounded operating limits and poor transient response, a search for an alternative controller arises. Recently, Artificial Neural Network (ANN) is gaining momentum as a controller for non linear systems. Herein an a...
This paper demonstrates the closed-loop control of frequency and phase a fluidic oscillator using acoustic excitation. It is shown experimentally that use excitation modifies passive feedback mechanism slows down jet switching process. Closed-loop employed to vary oscillation at fixed flow rate track sinusoidal reference target without error, measurements from pitot probe in device. The control...
Fluidic devices are often made by irreversibly bonding a polydimethylsiloxane (PDMS) mold to itself or a glass substrate by plasma treatment. This method limits the range of materials for fluidic device fabrication and utility for subsequent processing. Here, we present a simple and inexpensive method to fabricate fluidic devices using magnets to reversibly adhere PDMS and other polymer matrice...
Coanda Effect in Mechanical ventilators: Named after Henri Marie Coanda (June 7, 1886 – November 25, 1972) was a Romanian inventor, aerodynamics pioneer and the patent holder of the modern jet aircraft. The secret of the fluidic flip is a phenomenon known as the Coanda effect. This is a relatively new discovery previously applied in the fields of aerodynamics and jet engine design. When a jet o...
We have developed a low-cost liver cell culture device that creates fluidic flow over a 3D primary liver cell culture that consists of multiple liver cell types, including hepatocytes and non-parenchymal cells (fibroblasts, stellate cells, and Kupffer cells). We tested the performance of the cell culture under fluidic flow for 14 days, finding that hepatocytes produced albumin and urea at eleva...
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