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Spectral element modeling based structure piezoelectric impedance computation and damage identification

Zhigang GUO, Zhi SUN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 4, Pages 458-464 doi: 10.1007/s11709-011-0133-7

Abstract: This paper presents a numerical simulation study on electromechanical impedance technique for structuralThe basic principle of impedance based damage detection is structural impedance will vary with the occurrencelocation and severity of structural damage through the minimization of the deviations between structural impedance

Keywords： PZT piezoelectric impedance optimization spectral element damage identification

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stack configuration on interface resistances in reverse electrodialysis by in situ electrochemical impedance

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 4, doi: 10.1007/s11783-021-1480-9

Abstract:

• RED performance and stack resistance were studied by EIS and LSV.

Keywords： Reverse electrodialysis Electrochemical impedance spectroscopy Concentration polarization Spacer shadow

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Fuzzy force control of constrained robot manipulators based on impedance model in an unknown environment

LIU Hongyi, WANG Fei, WANG Lei

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 2, Pages 168-174 doi: 10.1007/s11465-007-0028-4

Abstract: unknown environment, a control strategy based on fuzzy prediction of the reference trajectory in the impedanceThe experimental results show that the desired trajectory in the impedance model is predicted exactly

Keywords： predictive tracking corresponding stiffness algorithm

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Detection of void and metallic inclusion in 2D piezoelectric cantilever beam using impedance measurements

S. SAMANTA, S. S. NANTHAKUMAR, R. K. ANNABATTULA, X. ZHUANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3, Pages 542-556 doi: 10.1007/s11709-018-0496-0

Abstract: of current work is to improve the existing inverse methodology of void-detection based on a target impedanceIn this work, mode-shape dependent shifting phenomenon of peaks of impedance curve with change in voideach iteration starting from each initial guess, the difference between the computationally obtained impedancecurve and the target impedance curve has been reduced.

Keywords： piezoelectricity impedance curve mode shapes inverse problem flaw detection curve shifting

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Human–Robot Collaboration Framework Based on Impedance Control in Robotic Assembly Article

Xingwei Zhao,Yiming Chen,Lu Qian,Bo Tao,Han Ding

Engineering 2023, Volume 30, Issue 11, Pages 83-92 doi: 10.1016/j.eng.2022.08.022

Abstract: An HRC framework for robotic assembly based on impedance control is proposed in this paper.main executor to perform the assembly action, which has the position control, drag and drop, positive impedancecontrol, and negative impedance control modes.

Keywords： Human–robot collaboration Impedance control Robotic assembly

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Valveless pumping using a two-stage impedance pump

V. C.-C. LEE, Y. A. ABAKR, K.-C. WOO

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3, Pages 311-318 doi: 10.1007/s11465-013-0270-x

Abstract:

Impedance pump is defined as a type of valveless pumping mechanism, where an elastic tube is joinedwith a tube of different impedance, a periodic asymmetrical compression on part of the elastic tubeconducted in the past, but little experimental work was found to exploit the principle of multi-stage impedancethis work is to have an insight on the deliverable head and pumping rate of an open-loop two-stage impedance

Keywords： valveless pumping open-loop two-stage unidirectional composite

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New method to determine optimum impedance of fault current limiters for symmetrical and/or asymmetrical None

Mahmoud MODARESI, Hamid LESANI

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 2, Pages 297-307 doi: 10.1631/FITEE.1601689

Abstract: To select the type and value of the impedance of fault current limiters (FCLs) for power network designers, we introduce a new method to calculate the optimum value of FCL impedance depending on its positionDue to the complexity of its impedance, the costs of both real and imaginary parts of FCL impedance areThe optimization of FCL impedance is based on a goal function that maximizes the reduction of the faultboth real and imaginary parts of FCL impedance.

Keywords： Fault current limiter (FCL) FCL impedance Short circuit current Fault current Power system

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An investigation on stress distribution effect on multi- piezoelectric energy harvesters

Hailu YANG, Dongwei CAO

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 3, Pages 301-307 doi: 10.1007/s11709-017-0404-z

Abstract: With the fast development of piezoelectric materials and due to its green and renewable characteristics, the piezoelectric energy harvesting technology has been paid more and more attention by pavement engineers. The stress distribution will significantly affect the piezoelectric material performance. In this paper, the effects of multiple piezoelectric elements on the generation of electrical energy and output power are studied. In the case of constant external load, the number of the piezoelectric units does not necessarily produce more energy. When the same multi piezoelectric units work together, if the stress state of the piezoelectric units is different, the total output energy affected by the connection mode. For uneven stress distribution, the optimal output mode is that each of the piezoelectric units rectified before connected in parallel.

Keywords： piezoelectric transducer uneven stress impedance matching optimal energy output

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Advances in tissue state recognition in spinal surgery: a review

Hao Qu, Yu Zhao

Frontiers of Medicine 2021, Volume 15, Issue 4, Pages 575-584 doi: 10.1007/s11684-020-0816-3

Abstract: Aside from traditional imaging methods, surgical sensing techniques based on force, bioelectrical impedance

Keywords： spinal surgery tissue state recognition image force sensing bioelectrical impedance

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Fuzzy impedance control of an electro-hydraulic actuator with an extended disturbance observer Regular Papers-Research Articles

Ming-jie LI, Jian-hua WEI, Jin-hui FANG, Wen-zhuo SHI, Kai GUO

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 9, Pages 1221-1233 doi: 10.1631/FITEE.1800155

Abstract: Impedance control and an extended disturbance observer are combined to solve this issue.Impedance control is applied to regulate the dynamic relationship between the velocity and output forceParameters of impedance rules are regulated by a fuzzy algorithm.

Keywords： Fuzzy control Impedance control Disturbance observer Parameter uncertainties Electro-hydraulic actuator

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Review of pantograph and catenary interaction

Weihua ZHANG, Dong ZOU, Mengying TAN, Ning ZHOU, Ruiping LI, Guiming MEI

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2, Pages 311-322 doi: 10.1007/s11465-018-0494-x

Abstract: pantograph-catenary interaction into a moving load problem and utilizing the theory of matching mechanical impedance

Keywords： railway pantograph and catenary interaction contact force variation moving load problem mechanical impedance

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A facile synthesis of high activity cube-like Pt/carbon composites for fuel cell application

Reza B. MOGHADDAM, Samaneh SHAHGALDI, Xianguo LI

Frontiers in Energy 2017, Volume 11, Issue 3, Pages 245-253 doi: 10.1007/s11708-017-0492-4

Abstract: Impedance spectroscopy analysis of the temperature treated and as-prepared (i.e., untreated) Pt /K composites

Keywords： synthesis cube-like Pt Pt/C composite catalyst impedance

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The Arithmetic of GTEM Cell Axe-shaped Piece´s Side Curve Equation

Zhou Xu

Strategic Study of CAE 2003, Volume 5, Issue 9, Pages 36-38

Abstract:

To be convenient for machining, the conventional axe-shaped pieces were approximately designed. It is proved that the traditional transition in a GTEM Cell can not give a satisfactory transmission loss distribution. So this paper gives the exact continuous curve equation for the axe-shaped piece´s two sides for the first time.

Keywords： giga-hz transverse electromagnetic cell the axe-shaped piece the side curve equation impedance matching

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Electrochemical characterization methods of the key materials for SOFC

Fan Liquan,Zhao Erqing and Gao Keqing

Strategic Study of CAE 2013, Volume 15, Issue 2, Pages 50-56

Abstract:

Solid oxide fuel cells (SOFCs) are the solid-state devices for generating electricity from the chemical energy. The effect of solid oxide materials on the performance of SOFC is especially important. From the influence of materials on electrochemical performance of SOFC, this paper summarizes electrochemical characterization methods for the composition materials of SOFC briefly based on the fundamentals of electrochemistry and solid electrochemistry. Some research experience is also included in the paper, which can facilitate the further research of materials.

Keywords： solid oxide materials direct current polarization alternating current impedance solid oxide fuel cell

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Sonic General Non-destructive Testing Technique

Chen Jimao

Strategic Study of CAE 2000, Volume 2, Issue 4, Pages 64-69

Abstract:

This paper describes new general multi-mode non-destructive testing (NDT) of composite materials and bonded structures for detecting discontinuities (defects) , the only multi-mode one of its kinds. This technique which is based on sonic and ultrasonic testing performs five different modes of testing to detect disbond, unbond, delamination, porosity, crushed core and other defects in composite materials and bonded structures. It equally suits for applications in manufacturing, maintenance and repair of composite materials and structures which almost include them in common use now availability. Good repeatability and reliability have been found. This paper discusses the principles of the five sonic mode constitute multi-mode sonic general bondtester and demostrates the vast range of propect for general NDT from our and our internal and external comrades* much practical experinence.

Keywords： testing general non-destructive testing (NDT) non-destructive testing of composite materials mechanical impedance