scholarly journals Performance evaluation of multi-stage open-loop impedance pump

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
V. C. C. Lee ◽  
Y. A. Abakr ◽  
K. C. Woo
Keyword(s):  
Performance Evaluation ◽  
Open Loop ◽  
Multi Stage ◽  
Impedance Pump

Multi-Stage System Identification of a Gas Turbine

2017 ◽  
Author(s):  
Amit Pandey ◽  
Maurício de Oliveira ◽  
Chad M. Holcomb
Keyword(s):  
Gas Turbine ◽  
Closed Loop ◽  
Open Loop ◽  
Loop System ◽  
Closed Loop Control ◽  
Input Output ◽  
Open Loop System ◽  
Loop Control ◽  
Multi Stage ◽  
Identification Techniques

Several techniques have recently been proposed to identify open-loop system models from input-output data obtained while the plant is operating under closed-loop control. So called multi-stage identification techniques are particularly useful in industrial applications where obtaining input-output information in the absence of closed-loop control is often difficult. These open-loop system models can then be employed in the design of more sophisticated closed-loop controllers. This paper introduces a methodology to identify linear open-loop models of gas turbine engines using a multi-stage identification procedure. The procedure utilizes closed-loop data to identify a closed-loop sensitivity function in the first stage and extracts the open-loop plant model in the second stage. The closed-loop data can be obtained by any sufficiently informative experiment from a plant in operation or simulation. We present simulation results here. This is the logical process to follow since using experimentation is often prohibitively expensive and unpractical. Both identification stages use standard open-loop identification techniques. We then propose a series of techniques to validate the accuracy of the identified models against first principles simulations in both the time and frequency domains. Finally, the potential to use these models for control design is discussed.

scholarly journals Performance Evaluation of a Resonant-integrated Pumping System

2018 ◽  
Vol 202 ◽  
pp. 02009
Author(s):  
Vincent Chieng-Chen Lee
Keyword(s):  
Performance Evaluation ◽  
Excitation Frequency ◽  
Pressure Head ◽  
Low Noise ◽  
Integrated System ◽  
Positive Outcomes ◽  
Pumping System ◽  
At Resonance ◽  
Impedance Pump ◽  
Maximum Amplification

Impedance pump is a simple valve-less pumping mechanism; it offers a low energy, low noise alternative at both macro- and micro-scale devices. It is also demonstrated to be a promising new technique for producing and amplifying net flow. There have been research studying the effects of series-connected impedance pump, where an increase in net flow is exhibited. In this study, an integrated system of conventional pump and impedance pump is introduced. This paper describes the performance evaluation of this integrated pumping system, with emphasis on the amount of amplification induced as a function of Womersley number (normalized excitation frequency) and normalized pressure head. Due to the nature of the resonant valve-less impedance pump, the integrated pumping system exhibits similar behaviour and characteristics as an impedance pump, such as the pulsatile nature of net flow. Results show positive outcomes where maximum amplification of 91.7% is demonstrated at resonance.

Performance evaluation of open loop multi-user MIMO systems

2011 ◽  
Author(s):  
S. Naga Sekhar Kshatriya ◽  
Sivakishore Reddy Yerrapareddy ◽  
Kiran Kuchi ◽  
Giridhar Krishnamurthy
Keyword(s):  
Performance Evaluation ◽  
Mimo Systems ◽  
Open Loop

Multi-stage Anti-Windup Compensation for Open-loop Stable Plants

2011 ◽  
Vol 56 (9) ◽  
pp. 2166-2172 ◽  
Author(s):  
Solmaz Sajjadi-Kia ◽  
Faryar Jabbari
Keyword(s):  
Open Loop ◽  
Multi Stage

scholarly journals Performance evaluation of large-scale multi-stage hetero-granular optical cross-connects

2014 ◽  
Vol 22 (3) ◽  
pp. 3157 ◽  
Author(s):  
Hai-Chau Le ◽  
Hiroshi Hasegawa ◽  
Ken-ichi Sato
Keyword(s):  
Performance Evaluation ◽  
Large Scale ◽  
Multi Stage
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