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Flow behavior of liquid-solid coupled system of piezoelectric micropump

LU Lijun, WU Jiankang

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1, Pages 50-54 doi: 10.1007/s11465-008-0003-8

Abstract: Through the mode analysis of the liquid-solid coupled system, the first-order natural frequency, diaphragmvibration shape and amplitude-frequency relationship are obtained.micropump is studied using the finite volume method to investigate the flow behavior and flow rate-frequencyNumerical results indicate that an optimal working frequency can be obtained, at which the flow rate

Keywords： amplitude-frequency relationship first-order micropump diaphragm vibration electric

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Characteristic of the equivalent impedance for an Article

Zhi-zhong TAN, Hong ZHU, Jihad H. ASAD, Chen XU, Hua TANG

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12, Pages 2070-2081 doi: 10.1631/FITEE.1700037

Abstract: Considerable progress has been made recently in the development of techniques to determine exactly two-point resistances in networks of various topologies. In particular, a general resistance formula of a non-regular × resistor network with an arbitrary boundary is determined by the recursion-transform (RT) method. However, research on the complex impedance network is more difficult than that on the resistor network, and it is a problem worthy of study since the equivalent impedance has many different properties from equivalent resistance. In this study, the equivalent impedance of a non-regular × RLC network with an arbitrary boundary is studied based on the resistance formula, and the oscillation characteristics and resonance properties of the equivalent impedance are discovered. In the RLC network, it is found that our formula leads to the occurrence of resonances at the boundary condition holding a series of specific values with an external alternating current source. This curious result suggests the possibility of practical applications of our formula to resonant circuits.

Keywords： RLC network Resonance properties Oscillation characteristics Amplitude-frequency

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Separation and extraction of bridge dynamic strain data

Baijian WU, Zhaoxia LI, Ying WANG, T. H. T. CHAN,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 4, Pages 395-400 doi: 10.1007/s11709-009-0049-7

Abstract: sensor at the same location, the information in the strain data was divided into three parts in the frequencyresponsibility for the errors, and the main reason is that the random disturbance shifts the real strain/stress amplitude

Keywords： dynamic valuable separatrix strain/stress amplitude frequency

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Development of electrorheological chip and conducting polymer-based sensor

Xianzhou ZHANG, Weihua LI, Weijia WEN, Yanzhe WU, Gordon WALLACE,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4, Pages 393-396 doi: 10.1007/s11465-009-0043-8

Abstract: When the four electrodes are controlled synchronously, the diaphragm acts as a vibrator whose frequencycan be adjusted in accordance with the frequency of the electrical signals.Experimental results show that the amplitude decreases monotonically when the frequency increases, owingWhen the vibration frequency is larger than 20Hz, the CP sensor can hardly detect the displacementThus, the upper limit frequency that the CP sensor can detect is about 20Hz.

Keywords： electrorheological (ER) fluids conducting polymer (CP) polydimethylsioxane (PDMS) driving frequency amplitude

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Impact drive rotary precision actuator with piezoelectric bimorphs

ZHANG Hongzhuang, ZENG Ping, HUA Shunming, CHENG Guangming, YANG Zhigang

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1, Pages 71-75 doi: 10.1007/s11465-008-0008-3

Abstract: experiments of the dynamic characteristics of end-loaded piezoelectric cantilever bimorphs, a specific fixed-frequencyand adjustable-amplitude is confirmed to control the actuator.The results show that an actuator excited by fixed-frequency and the adjustable-amplitude ramp voltage

Keywords： specific fixed-frequency waveform piezoelectric cantilever mechanisms adjustable-amplitude

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Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete

Frontiers of Structural and Civil Engineering Pages 1326-1340 doi: 10.1007/s11709-023-0014-x

Abstract: Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete

Keywords： strain relationship concrete

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Mesh relationship modeling and dynamic characteristic analysis of external spur gears with gear wear

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 1, Pages 9-9 doi: 10.1007/s11465-021-0665-z

Abstract: Gear wear is one of the most common gear failures, which changes the mesh relationship of normal gearThis paper aims to establish the model of mesh relationship and reveal the vibration characteristicsA geometric model for a new mesh relationship with gear wear is proposed, which is utilized to evaluateexperimental results indicate that gear wear does not change the structure of the spectrum, but it alters the amplitudeSeveral condition indicators, such as root-mean-square, kurtosis, and first-order meshing frequency amplitude

Keywords： gear wear mesh relationship mesh stiffness transmission error vibration characteristics

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Research on direct digital process of inductance sensor

WANG Xuan-ze, YANG Lian-gen, ZHONG Yu-ning

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 3, Pages 317-322 doi: 10.1007/s11465-006-0023-1

Abstract: Amplitude-displacement and phase-displacement equations are deduced for non-ideal carrier wave and inductancetraditional process method is an approximate one, a new method is presented to simultaneously obtain the amplitudeAccording to the characteristic of the amplitude-displacement and phase-displacement curves, we obtaindisplacement by phase and amplitude respectively when the sensor is close to the zero point position

Keywords： traditional corresponding phase-displacement Amplitude-displacement characteristic

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Application of a Novel Fuzzy Clustering Method Based on Chaos Immune Evolutionary Algorithm for Edge Detection in Image Processing

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 1, Pages 85-89 doi: 10.1007/s11465-005-0023-6

Abstract: a tiny disturbance is added to a filial generation group using a chaos variable and the disturbance amplitude

Keywords： disturbance amplitude disturbance diversity generation processing

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Mapping the structure-activity relationship of

Worawan PANPIPAT, Hasene KESKIN, Zheng GUO

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 1, Pages 105-113 doi: 10.1007/s11705-015-1502-x

Abstract: The phase behavior of twelve synthesized -sitosteryl fatty acid esters with acyl moieties with different chain lengths (C2:0-C18:0) and different degrees of unsaturation (C18:1-C18:3) were investigated in pure and mixed Langmuir monolayers with phospholipids. The surface-pressure isotherms showed that short chain -sitosteryl fatty acid esters gave smaller mean molecular areas and had decreased monolayer stability and the long chain steryl esters did not produce collapsed plateaus. All the steryl esters displayed strong condensing effects, but there was a pronounced structural dependency: medium chain esters (C8 and C10) were less efficient than short and long chain esters. Atomic force microscopy imaging demonstrated that monolayers mixed with dipalmitoyl phosphatidylcholine (DPPC) displayed both DPPC-rich and steryl lipid-rich domains. However, the height and area differences between the two phases and the roughness and morphologic patterns were very dependent on the steryl lipid concentrations as well as the length, the degree of unsaturation and the molecular conformations of the acyl segments. These findings not only provide a better understanding of the interactions between phytosteryl hydrophobic derivatives and biomembranes, but also may be of general use for the design and engineering of phytosterol structural derivations for specific food and pharmaceutical applications.

Keywords： acid esters dipalmitoyl phosphatidylcholine Langmuir monolayer condensing effect structure-activity relationship

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Property-performance relationship of core-shell structured black TiO photocatalyst for environmental

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 9, doi: 10.1007/s11783-023-1711-3

Abstract:

● Properties and performance relationship of CSBT photocatalyst were

Keywords： Black TiO₂ Core-shell structure Property-performance relationship Agro-industrial effluent

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A frequency error estimation for isogeometric analysis of Kirchhoff–Love cylindrical shells

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0006-x

Abstract: A frequency error estimation is presented for the isogeometric free vibration analysis of Kirchhoff–LoveBy analyzing the discrete isogeometric equations with the aid of harmonic wave assumption, the frequencyIn particular, the governing relationship of the continuum frequency for Kirchhoff–Love cylindrical shellsis naturally embedded into the frequency error measures without the need of explicit frequency expressionsNumerical results not only thoroughly verify the theoretical convergence rates of frequency solutions

Keywords： isogeometric analysis Kirchhoff–Love cylindrical shell free vibration frequency error convergence

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Stress-strain relationship with soil structural parameter of collapse loess

SHAO Shengjun, YU Qinggao, LONG Jiyong

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 3, Pages 293-293 doi: 10.1007/s11709-008-0100-0

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Calculation of collision frequency function for aerosol particles in free molecule regime in presence

Xiaowei LUO, Yannick BENICHOU, Suyuan YU

Frontiers in Energy 2013, Volume 7, Issue 4, Pages 506-510 doi: 10.1007/s11708-013-0275-5

Abstract: The collision frequency function for aerosol particles has already been calculated for the free moleculeforce, electric force and molecular forces, created by particles themselves, recalculated the collision frequencyAttractive forces increase naturally the collision frequency, while repulsive forces decrease it.

Keywords： aerosol particles collision frequency function coagulation

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Fuel variability effect on flickering frequency of diffusion flames

Jizhao LI, Yang ZHANG

Frontiers in Energy 2009, Volume 3, Issue 2, Pages 134-140 doi: 10.1007/s11708-009-0034-9

Abstract: The intent of this study is to investigate the fuel variability on the flickering frequency of diffusionIt was found that the low frequency oscillation of flow and flame structures depended only weakly onWhen a mixture of methane/propane at a ratio of 1:1 was used the peak flickering frequency was aroundMechanisms thought to produce changes in the dynamic response and frequency harmonics were discussed.

Keywords： fuel variability flickering frequency diffusion flames dynamics of combustion