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Amplitude analysis 1

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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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Controlling nested wrinkle morphology through the boundary effect on narrow-band thin films

Hanyang XU, Tielin SHI, Guanglan LIAO, Qi XIA

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2, Pages 235-240 doi: 10.1007/s11465-017-0458-6

Abstract: The formation of nested wrinkles was explained through the amplitude and wavelength saturation of nano-scale

Keywords： nested and hierarchical wrinkles morphology amplitude saturation boundary effect

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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: of the liquid-solid coupled system, the first-order natural frequency, diaphragm vibration shape and amplitude-frequency

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

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Air-bearing position optimization based on dynamic characteristics of ultra-precision linear stages

CHEN Xuedong, LI Zhixin

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4, Pages 400-407 doi: 10.1007/s11465-008-0060-z

Abstract: However, the dynamic characteristics including mode frequency, mode shape, and response amplitude are

Keywords： manufacture different interaction air-bearings response amplitude

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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: responsibility 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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Fatigue Life Prediction of Fiber Reinforced Metal Laminates Under Variable Amplitude Loading

Wu Xueren,Guo Yajun

Strategic Study of CAE 1999, Volume 1, Issue 3, Pages 35-40

Abstract: mechanism-based fatigue model was developed for the prediction of the fatigue lives of FRMLs under constant amplitudeof glass fiber reinforced laminates (GLARE), including crack growth and delamination, under constant amplitudeAn equivalent crack closure model for predicting crack growth in FRMLs under variable amplitude loadingAll the models in this paper were verified by applying to GLARE under constant amplitude loading and

Keywords： fiber reinforced metal laminates fatigue bridging stress delamination life prediction

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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: Experimental results show that the amplitude decreases monotonically when the frequency increases, owing

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: characteristics of end-loaded piezoelectric cantilever bimorphs, a specific fixed-frequency and adjustable-amplitudeThe 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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Reverse-Time Migration from Rugged Topography to Image Ground-Penetrating Radar Data in Complex Environments Article

John H. Bradford,Janna Privette,David Wilkins,Richard Ford

Engineering 2018, Volume 4, Issue 5, Pages 661-666 doi: 10.1016/j.eng.2018.09.004

Abstract:

In ground-penetrating radar (GPR) imaging, it is common for the depth of investigation to be on the same order as the variability in surface topography. In such cases, migration fails when it is carried out from a datum after the application of elevation statics. We introduce a reverse-time migration (RTM) algorithm based on the second-order decoupled form of Maxwell’s equations, which requires computation of only the electric field. The wavefield extrapolation is computed directly from the acquisition surface without the need for datuming. In a synthetic case study, the algorithm significantly improves image accuracy over a processing sequence in which migration is performed after elevation statics. In addition, we acquired a field dataset at the Coral Pink Sand Dunes (CPSD) in Utah, USA. The data were acquired over rugged topography and have the complex internal stratigraphy of multiply eroded, modern, and ancient eolian deposits. The RTM algorithm significantly improves radar depth images in this challenging environment.

Keywords： Ground-penetrating radar Reverse-time migration Sand dune Amplitude analysis

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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