scholarly journals MEMS Vibrational Power Generator for Bridge Slab and Pier Health Monitoring

2020 ◽  
Vol 10 (22) ◽  
pp. 8258
Author(s):  
Katsufumi Hashimoto ◽  
Tomoki Shiotani ◽  
Hiroyuki Mitsuya ◽  
Kai-Chun Chang
Keyword(s):  
Monitoring System ◽  
Health Monitoring ◽  
Microelectromechanical Systems ◽  
Power Generator ◽  
Power Generators ◽  
Civil Infrastructures ◽  
Energy Harvesters ◽  
Bridge Structures ◽  
Fixed Boundaries ◽  
Infinite Energy

Micro energy harvesters (MEH) based on microelectromechanical systems (MEMS) are rapidly developing, providing a green and virtually infinite energy source. The electrostatic vibratory power generator outputs electric power when it vibrates, motivating us to apply it to vibrating civil infrastructures excited by ambient and daily traffic loadings. In this study, an innovative monitoring system utilizing MEH devices was proposed for detecting slab damage and pier scours for bridge structures. Its performance was numerically investigated with finite element models, where the damage in slabs was modeled with a reduced Young’s modulus and scours with fixed boundaries of inclined depth. It was shown that the powers generated at each MEH varied as the target structure’s modal frequency shifted and amplitude changed by damage or scour. A power generation index was proposed to identify slab damage and a reference-free method was introduced to detect uneven pier scours. Utilizing an electrostatic vibration-based MEH (MEMS vibrational power generator), this pioneering study showed that MEMS vibrational power generators can work as sensors for an infrastructure structural health monitoring system.

Wireless Structural Health Monitoring Using MEMS

2005 ◽  
Vol 293-294 ◽  
pp. 625-634 ◽  
Author(s):  
Markus Krüger ◽  
Christian U. Grosse ◽  
Pedro José Marrón
Keyword(s):  
Structural Health Monitoring ◽  
Monitoring System ◽  
Health Monitoring ◽  
Visual Inspection ◽  
Microelectromechanical Systems ◽  
Life Time ◽  
Building Structures ◽  
Wireless Monitoring ◽  
Structural Health ◽  
Reliability And Robustness

So far, the inspection of building structures and especially of bridges is mainly done visually. Therefore, the condition of the structure is examined from the surface and the interpretation and assessment is based on the experience of the expert. However, the main purpose of monitoring civil structures is not to substitute visual inspection. Continuous structural health monitoring should provide data from the inside of a structure to better understand its structural performance and to predict its durability and remaining life time. Monitoring should render objective data and observable alterations in the structure continuously, which cannot be done by visual inspection. More detailed information is needed with respect to different exposure due to dynamic and static loads and also temperature and moisture. Today mainly wired monitoring systems are used to monitor structures, which are relatively expensive and time consuming to install. In this paper the basic principle of a wireless monitoring system equipped with MEMS sensors is presented, which can be easily installed at different structures. Microelectromechanical systems (MEMS) are small integrated devices or systems that combine electrical and mechanical components. A wireless monitoring sensor network equipped with such MEMS could be produced with a very low budget and becomes very efficient. This permits a wide area of applications not only in civil engineering. With respect to different applications relevant properties of a wireless monitoring system are described. In detail network configuration, power consumption, data acquisition and data aggregation, signal analysis and data reduction as well as reliability and robustness are discussed.

scholarly journals Review of Energy Harvesters Utilizing Bridge Vibrations

2016 ◽  
Vol 2016 ◽  
pp. 1-21 ◽  
Author(s):  
Farid Ullah Khan ◽  
Iftikhar Ahmad
Keyword(s):  
Health Monitoring ◽  
Power Production ◽  
Sensor Nodes ◽  
Vibration Energy ◽  
Lower Side ◽  
Resonant Frequencies ◽  
Energy Harvesters ◽  
Bridge Structures ◽  
Bridge Vibrations ◽  
Power Densities

For health monitoring of bridges, wireless acceleration sensor nodes (WASNs) are normally used. In bridge environment, several forms of energy are available for operating WASNs that include wind, solar, acoustic, and vibration energy. However, only bridge vibration has the tendency to be utilized for embedded WASNs application in bridge structures. This paper reports on the recent advancements in the area of vibration energy harvesters (VEHs) utilizing bridge oscillations. The bridge vibration is narrowband (1 to 40 Hz) with low acceleration levels (0.01 to 3.8 g). For utilization of bridge vibration, electromagnetic based vibration energy harvesters (EM-VEHs) and piezoelectric based vibration energy harvesters (PE-VEHs) have been developed. The power generation of the reported EM-VEHs is in the range from 0.7 to 1450000 μW. However, the power production by the developed PE-VEHs ranges from 0.6 to 7700 μW. The overall size of most of the bridge VEHs is quite comparable and is in mesoscale. The resonant frequencies of EM-VEHs are on the lower side (0.13 to 27 Hz) in comparison to PE-VEHs (1 to 120 Hz). The power densities reported for these bridge VEHs range from 0.01 to 9539.5 μW/cm3and are quite enough to operate most of the commercial WASNs.

Main problems of import subsumption in domestic engineering, applicable to small-power electric generator installations

2018 ◽  
Vol 1 (1) ◽  
pp. 46-51 ◽  
Author(s):  
A. V. Shelgunov
Keyword(s):  
Low Power ◽  
Import Substitution ◽  
Power Generator ◽  
Small Power ◽  
Domestic Production ◽  
Power Generators ◽  
Electric Generator ◽  
Generating Sets ◽  
Current State ◽  
Generator Sets

Subject: the subject of the study are low-power generator sets with a power of up to 30 kW.Materials and methods: in this paper, the main domestic legislative documents regulating the requirements for products. An assessment is made of the current state of Russian engine building.Results: the detailed analysis of the modern domestic market of power generating units with a capacity of up to 30 kW is made, the main problems in the field of domestic production of  electric power generators in the range up to 30 kW are revealed, and the prospects for import substitution of gasoline and diesel engines are noted.Conclusions: almost complete absence of the market of domestic low-power generating sets is established, insufficient measures taken to support domestic producers are noted, measures are  proposed for the development of domestic production of power units in the range of up to 30 kW.

Sign in / Sign up

Export Citation Format

Share Document