Research Papers

Self-Excited Vibrational Cantilever-Type Viscometer Driven by Piezo-Actuator

[+] Author and Article Information
Keiichi Higashino, Kazuhiko Aono

Department of Mechanical Engineering,
Keio University,
3-14-1 Hiyoshi, Kohokuku,
Yokohama, Kanagawa 223-8522, Japan

Hiroshi Yabuno

Graduate School of Systems and
Information Engineering,
University of Tsukuba,
1-1-1, Ten-no-dai,
Tsukuba Science City, Ibaraki 305-8573, Japan
e-mail: yabuno@esys.tsukuba.ac.jp

Yasuyuki Yamamoto

National Institute of Advanced Industrial Science and Technology (AIST),
Tsukuba Science City, Ibaraki 305-8568, Japan

Masaharu Kuroda

Graduate School of Engineering,
University of Hyogo,
Himeji, Hyogo 671-2201, Japan

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received January 9, 2015; final manuscript received June 29, 2015; published online August 4, 2015. Assoc. Editor: Jeffrey F. Rhoads.

J. Vib. Acoust 137(6), 061009 (Aug 04, 2015) (6 pages) Paper No: VIB-15-1011; doi: 10.1115/1.4030975 History: Received January 09, 2015

The design and operation of new viscometers are often presented with a focus on the miniaturization of the device and online monitoring of small amounts of liquid samples. The vibrational viscometers commonly used for viscosity measurements exploit the peak value of the frequency-response curve obtained from excitations of the oscillator submerged in the liquid. However, for high-viscosity liquids, the peak of the frequency-response curve is ambiguous or nonexistent, and hence hard to measure. To overcome this drawback and with a view to miniaturizing the device, we use the self-excited oscillations produced by a velocity feedback control. Our design uses a viscometer employing a cantilever driven by a piezo-actuator with analytics that do not rely on the frequency-response curve. A prototype piezo-driven macrocantilever with an oscillating plate attached at its tip was experimentally performed according to specifications. The proposed mechanism can be integrated into microelectromechanical systems (MEMS).

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Grahic Jump Location
Fig. 1

Analytical model of self-excited vibrational cantilever-type viscometer driven by piezo-actuator. x, y, and z axes denote the oscillating direction of the oscillating plate, the normal to the oscillating plate's surface, and the vertical direction from the fixed end of the cantilever to the surface of the sample of liquid, respectively. The oscillating plate is subjected to fluid force Ff from the liquid sample.

Grahic Jump Location
Fig. 5

Measurement results for the liquid samples listed in Table 1 using the self-excited vibrational cantilever-type viscometer driven by piezo-actuator. Liquid (i) is used for calibration. Measurements on each sample liquid were performed 20 times.

Grahic Jump Location
Fig. 2

Prototype of a self-excited vibrational cantilever-type viscometer. An 80-mm diameter oscillating plate is attached to the free end of the cantilever and is submerged in the liquid sample. Laser displacement sensor. A piezoelectric bimorph actuator is attached to the fixed end of the cantilever and bends the cantilever subject to control output from the proposed feedback method.

Grahic Jump Location
Fig. 4

Time history of the self-excited oscillation for the oscillating plate in liquid (iv). The response frequency of the oscillating plate is 3.4 Hz.

Grahic Jump Location
Fig. 3

Feedback loop producing the self-excited oscillation (x: displacement of the oscillating plate). An excess in the variable gain G over the critical value causes self-excited oscillations.



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