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Theoretical and experimental studies of a switched inertance hydraulic system including switching transition dynamics, non-linearity and leakage

Min Pan, Nigel Johnston, Andrew Plummer, Sylwester Kudzma, Andrew Hillis
2014 Proceedings of the Institution of mechanical engineers. Part I, journal of systems and control engineering  
In this paper, an enhanced analytical distributed parameter model in the frequency domain, which includes the effect of switching transition, non-linearity and leakage of the valve, is proposed and validated  ...  This paper reports on theoretical and experimental investigations of a switched inertance device, which is designed to control the flow and pressure of a hydraulic supply.  ...  As can be seen, lower system efficiency and higher system power loss occurred when the switching transition dynamics, non-linearity and leakage of the valve were included.  ... 
doi:10.1177/0959651814548299 fatcat:rsa3a2hkkzbxbog4hqhtmrozv4

Theoretical and experimental studies of a switched inertance hydraulic system

Min Pan, Nigel Johnston, Andrew Plummer, Sylwester Kudzma, Andrew Hillis
2013 Proceedings of the Institution of mechanical engineers. Part I, journal of systems and control engineering  
A switched inertance hydraulic system uses a fast switching valve to control flow or pressure and is potentially very efficient as it does not rely on dissipation of power by throttling.  ...  The proposed analytical models are effective for understanding, analysing and optimizing the characteristics and performance of a switched inertance hydraulic system.  ...  Declaration of conflicting interests The authors declare that there is no conflict of interest.  ... 
doi:10.1177/0959651813500952 fatcat:h5jkscjdhbgtlajmkiq7a3nssm

Theoretical and Experimental Studies of a Switched Inertance Hydraulic System in a Four-Port High-Speed Switching Valve Configuration

2017 Energies  
In this article, analytical models of an SIHS in a four-port high-speed switching valve configuration are proposed, and the system dynamics and performance are investigated theoretically and experimentally  ...  The switched inertance hydraulic system (SIHS) is a novel high-bandwidth and energy-efficient digital device which can adjust or control flow and pressure by a means that does not rely on throttling the  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/en10060780 fatcat:tbed3hjwpvaxlkpm4wukacbufu

Engineering research in fluid power: a review

Hua-yong Yang, Min Pan
2015 Journal of Zhejiang University: Science A  
The development and new techniques of the pump, valve, and actuator are presented in brief with a discussion of two typical modern fluid power systems, which are the switched inertance hydraulic system  ...  and the hydraulic quadruped robot.  ...  They consist of a long, small diameter 'inertance' tube and a highspeed switching valve with one common port, two switched ports, and an accumulator.  ... 
doi:10.1631/jzus.a1500042 fatcat:x76moxr4oveaxfvvsphl77xhzy

Active control of pressure pulsation in a switched inertance hydraulic system

Min Pan, Nigel Johnston, Andrew Hillis
2013 Proceedings of the Institution of mechanical engineers. Part I, journal of systems and control engineering  
For example, switched inertance hydraulic systems (SIHS), which are applied to adjust or control flow and pressure by a means that does not rely on dissipation of power, have noise problems due to the  ...  Extensive testing on a switched inertance hydraulic rig proved that the controller, which used a piezoelectric valve with fast response and good bandwidth, is effective and that it has several advantages  ...  Switched inertance hydraulic systems In this chapter, the principle of operation of switched inertance hydraulic systems is studied.  ... 
doi:10.1177/0959651813490096 fatcat:poylyk27uze2rc7tt6wzrrtlky

Review on miniaturized paraffin phase change actuators, valves, and pumps

Sam Ogden, Lena Klintberg, Greger Thornell, Klas Hjort, Roger Bodén
2013 Microfluidics and Nanofluidics  
However, a number of alternative methods have also been used in the literature. The most common applications to this date have been switches, positioning actuators, and microfluidic valves and pumps.  ...  Furthermore, a section focusing on fabrication of paraffin microactuators is also included.  ...  As the specific heat of paraffin is non-linear, and the substance generally undergoes multiple phase changes, the need for experimental data is necessary to build a truthful model.  ... 
doi:10.1007/s10404-013-1289-3 fatcat:znre4kph6ve5jjo2g4yhbsuu3y

SiC Technology [chapter]

Philip Neudeck
1999 Electrical Engineering Handbook  
However, the benefits of 100X decreased drift region resistance and much faster dynamic switching should summarizes experimental Schottky diode specific on-resistance versus breakdown voltage results published  ...  References 64, 65, 67, and 70 summarize electrical results obtained in a variety of SiC Schottky studies to date.  ... 
doi:10.1201/9781420049671.ch6 fatcat:vyky6jl77fcpbgmedbnuyms5ru

The Prospects for Closed Cycle M.P.D. Power Generation

B. C. Lindley, I. R. McNab, P. D. Dunn
1967 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
Cycle studies to specify operating parameters (including temperature, pressure, associated steam cycle, etc.) are presented.  ...  Because of the high temperatures and attendant problems associated with thermal ionization of the working gas plasma, emphasis is placed upon achieving non-equilibrium ionization.  ...  The authors wish to acknowledge permission to present this paper from the Board of Directors of G. A. Parsons and Go, Ltd., and the Director, Atomic Energy Research Establishment, Harwell.  ... 
doi:10.1098/rsta.1967.0008 fatcat:colnzd3dlzewdfwalr5q6qgsbi

Linear and nonlinear modelling of a theoretical travelling-wave thermoacoustic heat engine

Carlo Scalo, Sanjiva K. Lele, Lambertus Hesselink
2015 Journal of Fluid Mechanics  
A system-wide linear stability model based on Rott's theory is able to accurately predict the frequency and the growth rate, exhibiting properties consistent with a supercritical Hopf bifurcation.  ...  These features include Gedeon streaming and mean recirculations due to flow separation.  ...  Gregory Swift for his very useful comments on the draft and acknowledge the help of Prof. Ray Hixon for assisting in the development of  ... 
doi:10.1017/jfm.2014.745 fatcat:mdqbrr2udnbvfeyiushwxerqhq

Conceptual design and multidisciplinary optimization of in-plane morphing wing structures

Daisaku Inoyama, Brian P. Sanders, James J. Joo, Douglas K. Lindner
2006 Smart Structures and Materials 2006: Modeling, Signal Processing, and Control  
Using the experimental system, 2Hz mono-frequency is used for excitation of ER damper and the damping force is measured by load-cell.  ...  Snap-through buckling is a step further in the direction of using non-linear mechanics for actuator design.  ...  In this paper, the dynamic characteristics of the disk-type MR fluid damper are studied experimentally and theoretically in a flexible rotor with an over-hung disk.  ... 
doi:10.1117/12.658686 fatcat:rqnvt2atkjgnvpog5pivwjejzm

Noise as a resource [article]

Stefano Gherardini
2018 arXiv   pre-print
In this thesis we aim to analyze and quantify the energetic and information contents that can be extracted from a dynamical system subject to the external environment.  ...  As a matter of fact, even a partial knowledge of the environment can allow to set the system in a dynamical condition in which the response is optimized by the presence of noise sources.  ...  A non-exhaustive list of existing binary sensors, involving classical systems, includes: industrial sensors for brushless dc motors, liquid levels, pressure switches; chemical process sensors for vacuum  ... 
arXiv:1805.01800v1 fatcat:3cwbcqhlafbx5pcmiqraudassm

Microscopic theory and numerical simulation of quantum well solar cells

Urs Aeberhard, Bernd Witzigmann, Fritz Henneberger, Yasuhiko Arakawa, Marek Osinski
2010 Physics and Simulation of Optoelectronic Devices XVIII  
Return to Contents Conference 7597: Physics and Simulation of Optoelectronic Devices XVIII the only loss mechanism in the cell.  ...  We will also present experimental evidence indicating anisotropic emission in devices with highly-strained QWs.  ...  Polar and non-polar III-nitride materials are investigated via theoretical and experimental studies.  ... 
doi:10.1117/12.845478 fatcat:vxfg7swg3bh7rixxoa6qyhhx2u

Thermal hydraulic considerations of nuclear reactor systems: Past, present and future challenges

Guan Heng Yeoh
2019 Experimental and Computational Multiphase Flow  
A comprehensive review is presented of past, present and future challenges in state-of-the-art thermal hydraulic analysis covering various aspects of experimental, analytical and computational approaches  ...  Thermal hydraulic analysis of nuclear reactor core and its associated systems can be performed using analysis system, subchannel or computational fluid dynamics (CFD) codes to estimate the different thermal  ...  In most cases, models available for structural dynamics are modelled as linear-oscillator.  ... 
doi:10.1007/s42757-019-0002-5 fatcat:tb22ylp7mzdfzhvkad7aqfhb5y

Heat as a hydraulic tracer for horizontal subsurface flow constructed wetlands

Ricky Bonner, Lara Aylward, Charis Harley, Uwe Kappelmeyer, Craig M. Sheridan
2017 Journal of Water Process Engineering  
It was found that each methodology was capable of suggesting a different hydraulic behaviour for the same system being studied and since it is not possible to evaluate an analytical answer to the problem  ...  Proper design of HSSF CWs requires a detailed investigation into the hydraulic behaviour as it has a direct effect on the treatment performance in these systems.  ...  The hydraulic behaviour can be examined by conducting a hydraulic tracer study on the system (Alcocer et al., 2012) in which an inert chemical dye is injected as a step at the inlet and its concentration  ... 
doi:10.1016/j.jwpe.2017.01.007 fatcat:n2dig5as4ngchbusxfp3mijd7e

Surface dependent enhancement in water vapor permeation through nanochannels

Kaushik K. Rangharajan, Prashanth Mohana Sundaram, A. T. Conlisk, Shaurya Prakash
2018 The Analyst  
Transmission resistance for selective water vapor permeation through hydrophobic conduits with a varying degree of surface wettability is estimated inside a nanofluidic device.  ...  Department of Energy through grant number: DE-FE0024357, and The Office of Energy and Environment at The Ohio State University. K. K.  ...  Rangharajan acknowledges The Ohio State University for a presidential fellowship.  ... 
doi:10.1039/c8an00650d pmid:30028451 fatcat:v2ix26jnpzc2vo5d7llwamqaxi
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