Results 261 to 270 of about 28,947 (291)

Grinding process monitoring based on electromechanical impedance measurements

Measurement Science and Technology, 2015
Grinding is considered one of the last processes in precision parts manufacturing, which makes it indispensable to have a reliable monitoring system to evaluate workpiece surface integrity. This paper proposes the use of the electromechanical impedance (EMI) method to monitor the surface grinding operation in real time, particularly the surface ...
Marchi, Marcelo, Baptista, Fabricio Guimaraes, Aguiar, Paulo Roberto de, Bianchi, Eduardo Carlos   +3 more
openaire   +2 more sources

Characterisation of CFRP adhesive bonds by electromechanical impedance

SPIE Proceedings, 2014
In aircraft industry the Carbon Fiber Reinforced Polymer (CFRP) elements are joint using rivets and adhesive bonding. The reliability of the bonding limits the use of adhesive bonding for primary aircraft structures, therefore it is important to assess the bond quality.
Pawel H. Malinowski, Tomasz Wandowski, Wieslaw M. Ostachowicz   +2 more
openaire   +1 more source

Bone-crack detection by piezoeletric-electromechanical impedance method

2015 International Conference on Computer, Communications, and Control Technology (I4CT), 2015
There is a growing interest in the application of smart materials such as piezoelectric in the biomedical field. The work presented in this paper is an attempt to demonstrate the feasibility of bone-crack detection by using piezoelectric-electromechanical impedance (EMI) method, which has the advantages of low cost, portable and simplicity in ...
M.H. Mazlina, Sarpinah S.N Bibi, Rudy Tawie, Claira Dalislone Daho, Ishak Annuar   +4 more
openaire   +1 more source

Aging of Solid Propellants Investigated by Electromechanical Impedance Technique

Journal of Propulsion and Power, 2021
Aging induced changes in the mechanical properties of solid propellant can lead to defects, such as cracks and grain–liner separations, which limit the service lifetime of solid rocket motors.
Shoucheng Zhang, Li Xiao, Wenzhong Qu
openaire   +1 more source

PZT-Based Soil Compactness Measuring Sheet Using Electromechanical Impedance

IEEE Sensors Journal, 2020
Compaction is a crucial process in road construction and the compactness is an important parameter in determining the road foundation quality. Traditional compaction monitoring methods are based on different principles. The major principle of these techniques is detecting the water content and bulk density of the soil, and then calculating the dry ...
Jianchao Wu, Gang Yang, Xing Wang, Weijie Li   +3 more
openaire   +1 more source

Progressive Damage Detection/Diagnosis on Composite Using Electromechanical Impedance Spectroscopy

Volume 1: Advances in Aerospace Technology; Energy Water Nexus; Globalization of Engineering; Posters, 2011
Electromechanical impedance approach infers the structural dynamic characteristics at relatively high frequencies by using self-sensing piezoelectric wafer elements. Structural damage can be detected by comparing structural dynamic responses of damaged and undamaged structures.
Yu, Lingyu, Pollock, Patrick, Gresil, Matthieu, Sutton, Michael   +3 more
openaire   +2 more sources

Electromechanical Impedance Method to Assess the Stability of Dental Implants

Structural Health Monitoring 2017, 2017
In this paper we illustrate the application of the electromechanical impedance (EMI) technique, popular in structural health monitoring, to assess the stability of dental implants. The technique consists of bonding a piezoelectric transducer to the element to be monitored.
Rizzo, P., La Malfa Ribolla, E.
openaire   +1 more source

Wireless impedance device for electromechanical impedance sensing and low-frequency vibration data acquisition

SPIE Proceedings, 2009
This paper presents recent developments in an extremely compact, wireless impedance sensor node for combined use with both impedance method and low-frequency vibrational data acquisition. The sensor node, referred to as the WID3 (Wireless Impedance Device) integrates several components, including an impedance chip, a microcontroller for local ...
Stuart G. Taylor, Kevin M. Farinholt, Gyuhae Park, Charles R. Farrar, Eric B. Flynn, David L. Mascarenas, Michael D. Todd   +6 more
openaire   +1 more source

Electromechanical impedance for SHM of aircraft bolted joints

SPIE Proceedings, 2013
Some problems of the electromechanical impedance (EMI), especially its applications for structural health monitoring of aircraft bolt-joints and innovated approach of EMI prediction at loosening of bolt-joints are objectives of research. The full-scale test was performed using the Mi-8 helicopter tail beam.
openaire   +1 more source

Electromechanical impedance–based damage characterization using spectral element method

Journal of Intelligent Material Systems and Structures, 2016
The high-frequency nature of impedance-based structural health monitoring makes the utilization of impedance signature for model-based damage characterization a challenging problem. In this study, a novel damage characterization approach that utilizes impedance signature measured with a single piezoelectric wafer is developed.
Mohammad I. Albakri, Pablo A. Tarazaga
openaire   +1 more source