An evaluation of different piezoelectric materials for ‘SMART’ structural monitoring applications: The issue of structural integrity in the host structure and mechanical compatibility of embedded transducers

2002 ◽  
Author(s):  
B. Hailu
Keyword(s):  
Structural Integrity ◽  
Piezoelectric Materials ◽  
Structural Monitoring ◽  
Monitoring Applications ◽  
Host Structure ◽  
Mechanical Compatibility

scholarly journals Structural Monitoring and Safety Assessment during Translocation of Mahavira Hall of Jade Buddha Temple

2019 ◽  
Vol 11 (19) ◽  
pp. 5477 ◽  
Author(s):  
Zhang ◽  
Xue ◽  
Xie ◽  
Zhang ◽  
Lu
Keyword(s):  
Safety Assessment ◽  
Structural Integrity ◽  
Relative Displacement ◽  
Value Theory ◽  
Timber Structure ◽  
Structural Monitoring ◽  
Structural Performance ◽  
Threshold Values ◽  
Limit Value ◽  
The Ancient Chinese

The Mahavira Hall of the Jade Buddha Temple in Shanghai, China is a century-old traditional timber structure with a post-and-lintel construction. To improve the temple’s architectural layout and enhance the lintel structural integrity, the Mahavira Hall was moved 30.66 m and then elevated 1.05 m in September 2017. To assist in the structural translocation and uplift, the authors designed a monitoring system to continuously measure the relative displacement and inclination of the overall structure, individual components, and inside statues to ensure the integrity of the hall and its contents. This article presents and summarizes the priority issues and principles of monitoring the ancient Chinese timber structure. The time series of monitored data are decimated in order to minimize the fluctuation of data. The structural integrity of the Mahavira Hall was evaluated based on the inclination angle of its vital members. Finally, combined with the limit value regulated by code and the predicted early warning threshold values, which are based on extreme value theory, the effect of the translocation on the structural performance was obtained using fuzzy logic.

scholarly journals Characterization of Low-Cost Inkjet Printed-Photonic Cured Strain Gauges for Remote Sensing and Structural Monitoring Applications

2021 ◽  
Author(s):  
Juho Kerminen ◽  
Jenny Wiklund ◽  
Alp Karakoç ◽  
Kalle Ruttik ◽  
Riku Jäntti ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Low Cost ◽  
Effective Strain ◽  
Cost Effective ◽  
Structural Monitoring ◽  
Strain Gauges ◽  
Gauge Factor ◽  
Ohmic Resistance ◽  
Monitoring Applications ◽  
Potential Applications

In the present work, cost-effective strain gauges were fabricated by using inkjet printing and photonic curing on flexible and recyclable PET substrates. Ohmic resistance (a.k.a. DC resistance) (R0) and complex electrical impedance (Z) as a function of test frequency were characterized, respectively, with the state-of-the-art electronic testing equipments. For the fabrication process, commercially available silver nanoparticle (AgNP) inks and printing substrates were used in order to eliminate any apriori ink processing. In order to validate the in-house cantilever beam measurement setup and devices, first, commercially available metallic foil strain gauges (with the provided gauge factor GF=2 by the manufacturer) were tested at different locations. Thereafter, the printed strain gauges were investigated with several repetitions at different measurement locations. The measurement results demonstrated an affordable, rapid and tailorable design and repeatable fabrication approach for strain gauges with GFavg~6.6, which has potential applications in remote sensing and structural monitoring applications.

Reliability and durability of fiber grating sensors in structural monitoring applications

1997 ◽  
Author(s):  
Urs J. Sennhauser ◽  
Rolf Broennimann ◽  
Pascal Mauron ◽  
Philipp M. Nellen
Keyword(s):  
Structural Monitoring ◽  
Fiber Grating ◽  
Monitoring Applications

GNSS-based multi-sensor system for structural monitoring applications

2012 ◽  
Vol 6 (1) ◽  
Author(s):  
Janusz Bogusz ◽  
Mariusz Figurski ◽  
Grzegorz Nykiel ◽  
Marcin Szolucha ◽  
Maciej Wrona
Keyword(s):  
Sensor System ◽  
Structural Monitoring ◽  
Monitoring Applications

scholarly journals Recent Advances in Energy Harvesting Technologies for Structural Health Monitoring Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Joseph Davidson ◽  
Changki Mo
Keyword(s):  
Structural Health Monitoring ◽  
Energy Harvesting ◽  
Health Monitoring ◽  
Frequency Tuning ◽  
Piezoelectric Materials ◽  
Local Environment ◽  
Wind Pressure ◽  
Structural Health ◽  
Monitoring Applications ◽  
Harvesting Systems

This paper reviews recent developments in energy harvesting technologies for structural health monitoring applications. Many industries have a great deal of interest in obtaining technology that can be used to monitor the health of machinery and structures. In particular, the need for autonomous monitoring of structures has been ever-increasing in recent years. Autonomous SHM systems typically include embedded sensors, data acquisition, wireless communication, and energy harvesting systems. Among all of these components, this paper focuses on the energy harvesting technologies. Since low-power sensors and wireless communications are used in newer SHM systems, a number of researchers have recently investigated techniques to extract energy from the local environment to power these stand-alone systems. Ambient energy sources include vibration, thermal gradients, solar, wind, pressure, etc. If the structure has a rich enough loading, then it may be possible to extract the needed power directly from the structure itself. Harvesting energy using piezoelectric materials by converting applied stress to electricity is most common. Other methods to harvest energy such as electromagnetic, magnetostrictive, or thermoelectric generator are also reviewed. Lastly, an energy harvester with frequency tuning capability is demonstrated.

A NOTE ON POSSIBLE FLUTTER OF PIEZOELECTRIC LAYERS

2005 ◽  
Vol 05 (01) ◽  
pp. 125-133 ◽  
Author(s):  
Q. WANG
Keyword(s):  
Piezoelectric Layer ◽  
Piezoelectric Materials ◽  
Technical Note ◽  
Critical Ratio ◽  
Zirconium Titanate ◽  
Lead Zirconium Titanate ◽  
Flutter Instability ◽  
Piezoelectric Layers ◽  
Host Structure ◽  
The Stability

This technical note presents the solution for flutter instability of a piezoelectric layer subjected to an external voltage which can be modeled as a compressive follower force. The critical ratio of the length to the thickness of the piezoelectric layer for the possible flutter instability is derived given the endurable electric field of the piezoelectric material. The calculation is conducted for piezoelectric layers which are both free and surface bonded on a host structure. Numerical simulations are conducted for the possible flutter instability of different PZT (Lead Zirconium Titanate) materials. The findings in this study should serve as useful benchmarks for the stability analysis of piezoelectric materials.

scholarly journals Structural Integrity of Conventional and Modified Railroad Bearing Adapters for Onboard Monitoring

2014 ◽  
Author(s):  
Joseph Montalvo ◽  
Alexis Trevino ◽  
Arturo A. Fuentes ◽  
Constantine M. Tarawneh
Keyword(s):  
Finite Element ◽  
Structural Integrity ◽  
Element Model ◽  
Operating Conditions ◽  
Finite Element Analyses ◽  
Distribution Maps ◽  
Bearing Condition Monitoring ◽  
Monitoring Applications ◽  
Railroad Bearing ◽  
The Impact

This paper presents a detailed study of the structural integrity of conventional and modified railroad bearing adapters for onboard monitoring applications. Freight railcars rely heavily on weigh bridges and stations to determine cargo load. As a consequence, most load measurements are limited to certain physical railroad locations. This limitation provided an opportunity for an optimized sensor that could potentially deliver significant insight on bearing condition monitoring as well as load information. Bearing adapter modifications (e.g. cut-outs) were necessary to house the sensor and, thus, it is imperative to determine the reliability of the modified railroad bearing adapter, which will be used for onboard health monitoring applications. To this end, this study quantifies the impact of the proposed modifications on the adapter structural integrity through a series of experiments and finite element analyses. The commercial software Algor 20.3TM is used to conduct the stress finite element analyses. Different loading scenarios are simulated with the purpose of obtaining the conventional and modified bearing adapter stresses during normal and abnormal operating conditions. This information is then used to estimate the lifetime of these bearing adapters. Furthermore, this paper presents an experimentally validated finite element model which can be used to attain stress distribution maps of these bearing adapters in different service conditions. The maps are also useful for identifying areas of interest for an eventual inspection of conventional or modified railroad bearing adapters in the field.

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