Piezoelectric strain rate gages

Lee, C. ‐K.; O’Sullivan, T. C.

doi:10.1121/1.401961

Cited by 54 publications

(19 citation statements)

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“…The frequency spectra of PVDF 2 × 1 are quite clear and easy to identify in the interval below 30,000 Hz, but hard to distinguish above 30,000 Hz, while those of PVDF 5 × 2.5 are all clear and easy to be distinguish. Theoretically, the size of the PVDF film sensor is expected to be small enough or compatible to the smallest wave length [12]. However, our experimental results demonstrate that if the interesting mode is high ( i.e.…”

Section: Resultsmentioning

confidence: 87%

“…Cross-sensitivity and size effects are two factors of piezoelectric sensors known theoretically to affect the sensing responses. To allow a PVF 2 lamina to measure the strain rate only along a specified direction, innovative methods considering the surface electrode, skew angle, or polarization profile had been proposed by Lee et al [12] In Lee’s work, the proposed methods are examined by comparing the sensing results obtained by PVF 2 lamina with those obtained by differentiating the signals of a traditional strain gage. In this paper, we focus experimentally on two effects ( i.e.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Cross-Sensitivity and Size Effects of Polyvinylidene Fluoride Film Sensors on Modal Testing

Chuang

Liou

2012

Sensors

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Due to advantages such as light weight, flexibility, and low cost, polyvinylidene fluoride (PVDF) films have been widely used in engineering applications as sensors for detecting strain, pressure, or micro-force. However, it is known that PVDF strain sensors have strain cross-sensitivity in mutually orthogonal directions. Furthermore, the size of the PVDF film sensor would also affect the dynamic strain sensing performance. In this paper, to investigate the cross-sensitivity and size effects experimentally, we employ PVDF film sensors to perform dynamic measurements on a cantilever beam. Since the vibrations of the cantilever beam are excited by impacts of a steel ball, the induced highly repeatable transient responses contain a wide range of resonant frequencies and thus can be used to investigate both the size and cross-sensitivity effects of the PVDF film sensors in a dynamic sensing environment. Based on the experimental results of the identified resonant frequencies compared with results obtained from a strain gauge, finite element calculations, and theoretical predictions, suggestions for the use of the PVDF strain sensor in modal testing are given in this paper.

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Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Cross-Sensitivity and Size Effects of Polyvinylidene Fluoride Film Sensors on Modal Testing

Chuang

Liou

2012

Sensors

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“…Distributed piezoelectric actuators are used exclusively in the sensor studies. These actuators have been quite extensively studied in the recent years2' 3,6,[9][10][11][12][13][14][15][16][17][18][19][20][21][22] The actuators used in this paper are the ones developed in6. In the following section, we present the numerical results of these comparative studies without showing much mathematical details which can be found in23 .…”

Section: Introductionmentioning

confidence: 99%

<title>Study of shell interior noise control</title>

Shen

Sun

1997

SPIE Proceedings

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There is a growing interest in the application of smart materials technology to the aircraft interior noise control problem. Some outstanding issues with the interior noise control problem include development of sensory systems that can lead to global sound level reduction in the cabin, and the safety concern of structural actuators used to reduce noise radiation. This paper presents two comparative studies: 1) comparison of several sensor configurations by using acoustic microphones, and 2) comparison of strain fields induced by discrete and distributed structural actuators. A uniform cylindrical shell is used as a simplified model of a section of fuselage. Extensive simulations have been conducted. Major findings of this paper are 1 . In order to control the interior noise in the shell where there is no acoustic source inside, one only needs to place acoustic sensors near the wall. Furthermore, if one uses the energy density as an error signal, one can reduce the number of error input channels substantially. In terms of the ability to lead to the global noise reduction, a 4-channel energy density sensor is found to be comparable to 32 microphones uniformly spaced on a ring.2. Distributed piezoelectric actuators tend to introduce smoother strain fields on the shell than discrete actuators as measured by a strain index defined in the paper. This quantitative result agrees with one' s intuition.Simulation results of adaptive control of multi-tone noise field using discrete and distributed structural actuators are also presented in the paper.

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“…A key characteristic of PE materials is the utilization of the direct PE effect to sense structural deformation and the converse PE effect to actuate structures. Compared with the conventional strain gauge sensors and accelerometers, the PE strain sensors have certain advantages that could be summarized as follows: 1) ability to measure the first derivative of physical deformation; 2) high linearity and sensitivity from their superior noise immunity as compared with differentiated sensing performance of conventional strain sensors [31], [33]; 3) high frequency range [32]; 4) space efficiency without a structural change on the measuring target [34]; and 5) negligible high temperature effect on the measurement output [32] and [35]. The aforementioned benefits allow for PE strain sensors to potentially have greater sensing resolution and accuracy.…”

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confidence: 99%

On the Use of a Single Piezoelectric Strain Sensor for Wind Turbine Planetary Gearbox Fault Diagnosis

Yoon

Hecke

2015

IEEE Trans. Ind. Electron.

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Planetary gearboxes (PGBs) are widely used in the drivetrain of wind turbines. Any PGB failure could lead to breakdown of the whole drivetrain and major loss of wind turbines. Therefore, PGB fault diagnosis is important in reducing the downtime and maintenance cost and improving the reliability and lifespan of wind turbines. PGB fault diagnosis has been done mostly through vibration analysis over the past years. Vibration signals theoretically have an amplitude modulation (AM) effect caused by time-variant vibration transfer paths due to the rotation of planet carrier and sun gear, and therefore, their spectral structure is complex. Strain sensor signals, on the other hand, are closely correlated to torsional vibration, which is less sensitive to the AM effect caused by rotating vibration transfer path. Thus, it is potentially easy and effective to diagnose PGB faults via stain sensor signal analysis. In this paper, a new method using a single piezoelectric strain sensor for PGB fault diagnosis is presented. The method is validated on a set of seeded localized faults on all gears, namely, sun gear, planetary gear, and ring gear. The validation results have shown a satisfactory PGB fault diagnostic performance using strain sensor signal analysis.

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Piezoelectric strain rate gages

Cited by 54 publications

References 0 publications

Experimental Investigation of the Cross-Sensitivity and Size Effects of Polyvinylidene Fluoride Film Sensors on Modal Testing

Experimental Investigation of the Cross-Sensitivity and Size Effects of Polyvinylidene Fluoride Film Sensors on Modal Testing

<title>Study of shell interior noise control</title>

On the Use of a Single Piezoelectric Strain Sensor for Wind Turbine Planetary Gearbox Fault Diagnosis

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