Piezoelectric-based Fluid Bulk Modulus Sensor

Niezrecki, Christopher; Schueller, John K.; Balasubramanian, Karthik

doi:10.1177/1045389x04045151

Cited by 23 publications

(17 citation statements)

References 17 publications

(12 reference statements)

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“…In this equation, the connection between acoustic impedance and gas content can be established principally through the bulk modulus. Niezrecki et al (2004) reported that an amount of air representing 1% of the volume of the fluid added to it, leads to a reduction of the bulk modulus of 44%. However, this tiny air incorporation causes a weak effect in the density of the batter that could be quantified roughly through:…”

Section: Flow Index (N)mentioning

confidence: 98%

Characterization of cake batters by ultrasound measurements

Gómez

Oliete

García-Álvarez

et al. 2008

Journal of Food Engineering

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Section: Flow Index (N)mentioning

confidence: 98%

Characterization of cake batters by ultrasound measurements

Gómez

Oliete

García-Álvarez

et al. 2008

Journal of Food Engineering

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“…For the piezohydraulic energy harvester, the pressure difference generated within the cylinder chambers is a function of the fluid bulk modulus. According the definition of fluid bulk modulus, the liquid pressure difference in cylinder chamber A and B can be given as [19] …”

Section: S Wang Et Al / a Piezohydraulic Generator For Vibration Enmentioning

confidence: 99%

A piezohydraulic generator for vibration energy harvesting

Wang

Liu

Kan

et al. 2014

JAE

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To improve energy generating capability and reliability/strength, a novel piezohydraulic generator for low frequency vibration was presented. The piezohydraulic generator consisted mainly of a double-rod hydraulic cylinder for conversion of vibration energy to fluid energy and piezodiscs for conversion of the fluidic energy to electric energy. A vibration function and energy-conversion model of the generator was established based on theory of vibration analysis and simulated to obtain the influence of backpressure on energy generation as well as optimal frequency. The analysis results show that both the energy generation and optimal frequency increases with the rising of backpressure under given other parameters. A piezohydraulic harvester was fabricated and tested at different backpressure. Both the optimal frequency and the relative peak voltage/power increase with the rising of backpressure. At 0.2 MPa and 0.8 MPa, the peak-voltage and the relative optimal-frequency are 9 V/11 Hz and 112 V/17.5 Hz respectively. Similarly, the peak-power and the relative optimal-frequency are 0.58 mW/13 Hz and 11.63 mW/17 Hz respectively. The research results indicate that a piezohydraulic generator can be used to harvest energy from a low-frequency and high-level vibration source.

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“…Real-time monitoring of the fluid bulk modulus is nearly impossible in common hydraulic control systems since the current measuring devices are too bulky and complex. Recently, research on a simple measurement technique using piezoelectric materials has been performed (Niezrecki et al, 2004). It was suggested that the effective bulk modulus can be estimated from the displacement of piezoelectric stack transducers.…”

Section: Introductionmentioning

confidence: 99%

On-line Estimation of Effective Bulk Modulus in Fluid Power Systems Using Piezoelectric Transducer Impedance

Kim

Wang

2009

Journal of Intelligent Material Systems and Structures

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The effective bulk modulus of working fluids plays an important role in the control of hydraulic actuation systems because of its effect on the system response time and performance. Therefore, to ensure good control, monitoring the effective bulk modulus of the working fluids is an important task. Current methods normally require precision test equipment consisting of many complex components. The size of these devices is large and thus makes online measurement impractical. In this research, we develop a new on-line technique to estimate effective bulk modulus of the working fluids based on measurements of the impedance of piezoelectric transducers. The idea is to generate a sensitivity curve characterizing the relationship between the effective bulk modulus and the impedance resonant frequency via either off-line numerical simulation or off-line experimental calibration; the curve can then be used for monitoring the working fluids bulk modulus in an online manner. In this article, a simulation model is utilized to predict the peak resonance frequency of the impedance function and identify its dependency on the variation of the fluid bulk modulus. The new approach is then illustrated and a sensitivity curve is generated through comparing the simulation results with experimental data.

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Piezoelectric-based Fluid Bulk Modulus Sensor

Cited by 23 publications

References 17 publications

Characterization of cake batters by ultrasound measurements

Characterization of cake batters by ultrasound measurements

A piezohydraulic generator for vibration energy harvesting

On-line Estimation of Effective Bulk Modulus in Fluid Power Systems Using Piezoelectric Transducer Impedance

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