New Tools for Structural Testing: Piezoelectric Impact Hammers and Acceleration Rate Sensors

Lee, C. K.; Lin, Chih‐Ting; Hsiao, C. C.; Liaw, Wen‐Feng

doi:10.2514/2.4313

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Lorenz [19] have designed and calibrated an impact penetrometer using a piezoelectric transducer for use on a spacecraft to land on the surface of Titan, one of Saturn's moons. Lee [20] have designed and built an ultra-high precision and high speed piezoelectric impact system. The experimental data indicates that this piezoelectric impact hammer has a timing accuracy in the range of microseconds and a positioning accuracy in the range of micrometers.…”

Section: Introductionmentioning

confidence: 99%

Damage detection of concrete piles subject to typical damages using piezoceramic based passive sensing approach

Feng¹,

Xiao²,

Kong³

et al. 2016

J. vibroeng.

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Pile foundations are typically comprised in concealed construction work. In recent years, some major categories of concrete piles subject to typical damages have caused a lot of engineering disasters and accidents. These accidents have been caused by collapse of civil structures resulting in great casualties and economic loss. Therefore, damage detection and real-time health monitoring on foundation piles is an urgent research requirement. In this research, a piezoceramic based passive sensing approach is proposed to detect typical damages types of concrete piles, including partial mud intrusion, secondary concrete pouring interface, circumferential crack, and full mud intrusion. In this passive sensing approach, induced stress waves are generated by the impact hammer on the top surface of a pile and one smart aggregate embedded on the bottom of each pile is used as a sensor to receive the propagating wave signals. These sensors are embedded before pouring concrete. Structural defects affect the natural frequency of the pile. The power spectrum of piles with different types of damage were compared by plotting the sensor signals in frequency domain. The natural frequency decreases with the increase in defect severity. The experimental results demonstrate that the proposed approach can detect all four typical damage types in concrete piles.

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Section: Introductionmentioning

confidence: 99%

Damage detection of concrete piles subject to typical damages using piezoceramic based passive sensing approach

Feng¹,

Xiao²,

Kong³

et al. 2016

J. vibroeng.

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“…The impact force profile allows estimation of the density and cohesion of the surface material and its particle size distribution. Lee et al (1998) designed and built an ultra-high-precision high-speed piezoelectric impact system. The experimental data indicates that this piezoelectric impact hammer has a timing accuracy in the range of microseconds and a positioning accuracy in the range of micrometres.…”

Section: Introductionmentioning

confidence: 99%

An overheight vehicle–bridge collision monitoring system using piezoelectric transducers

Song

Olmi

2007

Smart Mater. Struct.

140

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With increasing traffic volume follows an increase in the number of overheight truck collisions with highway bridges. The detection of collision impact and evaluation of the impact level is a critical issue in the maintenance of a concrete bridge. In this paper, an overheight collision detection and evaluation system is developed for concrete bridge girders using piezoelectric transducers. An electric circuit is designed to detect the impact and to activate a digital camera to take photos of the offending truck. Impact tests and a health monitoring test were conducted on a model concrete bridge girder by using three piezoelectric transducers embedded before casting. From the experimental data of the impact test, it can be seen that there is a linear relation between the output of sensor energy and the impact energy. The health monitoring results show that the proposed damage index indicates the level of damage inside the model concrete bridge girder. The proposed overheight truck-bridge collision detection and evaluation system has the potential to be applied to the safety monitoring of highway bridges.

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“…This demand of ultra-high positioning precision forms a pivotal requirement in many applications of nanotechnology. For example micro/nanopositioning systems are essential in auto focus systems [l] in optics; disk spin stands and vibration cancellation in disk drives [2]; wafer and mask positioning in microelectronics [3]; piezo hammers [4] in precision mechanics; and cell penetration and micro dispensing devices [5] in medicine and biology. Besides this requirement of high precision, there is also an increasing need for high bandwidth positioning systems.…”

Section: Introductionmentioning

confidence: 99%

Design, identification and control of a fast nanopositioning device

Salapaka

Sebastian

Cleveland³

et al. 2002

Proceedings of the 2002 American Control Conference (IEEE Cat. No.CH37301)

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This paper presents t h e design, identification and control of a nanopositioning device. T h e device is actuated by a piezoelectric stack and its motion is sensed by a Linear Variable Differential Transformer (LVDT). A fourth order single input single output model has been identified to describe its dynamics. It is demonstrated t h a t PI control law does not meet the bandwidth requirements for positioning. This motivated the design and implementation of a n ' H , controller which demonstrates substantial improvements in t h e positioning speed and precision besides eliminating t h e undesirable nonlinear effects of t h e actuator. T h e characterization of the device in terms of bandwidth, resolution, and repeatability is also shown.

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New Tools for Structural Testing: Piezoelectric Impact Hammers and Acceleration Rate Sensors

Cited by 5 publications

References 5 publications

Damage detection of concrete piles subject to typical damages using piezoceramic based passive sensing approach

Damage detection of concrete piles subject to typical damages using piezoceramic based passive sensing approach

An overheight vehicle–bridge collision monitoring system using piezoelectric transducers

Design, identification and control of a fast nanopositioning device

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