Piezoelectric vibratory gyroscope using flexural vibration of a triangular bar

Fujishima, S.; Nakamura, Tomoya; Fujimoto, Koji

doi:10.1109/freq.1991.145911

Cited by 23 publications

(4 citation statements)

References 2 publications

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“…Vibratory gyroscopes are used in electronic devices such as digital cameras for image stabilization, car navigation systems, and so on, because of their cost-effectiveness and compactness compared with optical-fiber gyroscopes and mechanical gyroscopes. [11][12][13] Recently, gyroscopes are required for sensing more complicated motions in wide-range of rotation speeds, and the use of vibratory gyroscopes has spread in various fields such as game controllers for motion sensing and robots for motion control. 14,15) Although resonators used in gyroscopes have been studied and many types of vibratory gyroscopes have been proposed, [16][17][18][19][20][21][22][23][24][25][26][27] these vibratory gyroscopes use a single pair of degenerate modes for driving and detecting modes in each axis.…”

Section: Introductionmentioning

confidence: 99%

Coaxial Vibratory Gyroscope Using Two Pairs of Degenerate Modes

Nakanishi¹,

Wakatsuki

Mizutani

2012

Jpn. J. Appl. Phys.

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A gyroscope using two pairs of degenerate modes for wide-range sensing is proposed. We focused on a coaxial resonator composed of a cylinder and a column. To evaluate the characteristics of the proposed gyroscope, we analyzed its frequency response and rotational response both experimentally and numerically. From the frequency response under rotation, there was a difference between the shifts of resonance frequencies of two detecting modes. We also found that the lower-frequency mode had higher sensitivity and the higher-frequency mode had a wider linear region from the rotation response of each mode. These results suggest that high sensitivity for low-speed rotation and a wide linear region for high-speed sensing can be attained simultaneously by a single resonator with the help of two different pairs of degenerate modes.

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Section: Introductionmentioning

confidence: 99%

Coaxial Vibratory Gyroscope Using Two Pairs of Degenerate Modes

Nakanishi¹,

Wakatsuki

Mizutani

2012

Jpn. J. Appl. Phys.

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“…When a piezoelectric gyroscope is excited into vibration in one of the two modes (the primary mode) by an applied alternating voltage and attached to a rotating body, Coriolis force will excite the other mode (the secondary mode) through which the rotation rate of the body can be detected. These piezoelectric gyroscopes include flexural vibrations in two perpendicular directions of beams and tuning forks [10][11][12][13], thickness-shear vibrations in two perpendicular directions of plates [14,15], radial and torsion vibrations of circular cylindrical shells [16], and degenerate modes of circular disks, shells, and rings [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Model Design of Piezoelectric Micromachined Modal Gyroscope

Wang

et al. 2011

Journal of Sensors

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This paper reports a novel kind of solid-state microgyroscope, which is called piezoelectric micromachined modal gyroscope (PMMG). PMMG has large stiffness and robust resistance to shake and strike because there is no evident mass-spring component in its structure. This work focused on quantitative optimization of the gyroscope, which is still blank for such gyroscope. The modal analysis by the finite element method (FEM) was firstly conducted. A set of quantitative indicators were developed to optimize the operation mode. By FEM, the harmonic analysis was conducted to find the way to efficiently actuate the operational mode needed. The optimal configuration of driving electrodes was obtained. At last, the Coriolis analysis was conducted to show the relation between angular velocity and differential output voltage by the Coriolis force under working condition. The results obtained in this paper provide theoretical basis for realizing this novel kind of micromachined gyroscope.

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“…When a piezoelectric gyroscope is excited into vibration in one of the two modes (the primary mode) by an applied alternating voltage and attached to a rotating body, Coriolis force will excite the other mode (the secondary mode) through which the rotation rate of the body can be detected. These piezoelectric gyroscopes include flexural vibrations in two perpendicular directions of beams and tuning forks [11][12][13][14], thicknessshear vibrations in two perpendicular directions of plates [15,16], radial and torsion vibrations of circular cylindrical shells [17] and degenerate modes of circular disks, shells and rings [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis of a piezoelectric micromachined modal gyroscope (PMMG)

Wu¹,

Chen²,

Lu³

et al. 2009

J. Micromech. Microeng.

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Piezoelectric micromachined modal gyroscope (PMMG) is a novel kind of rotating rate sensor, which is based on the special thickness-shear vibrating mode of a piezoelectric body. Compared with the general vibratory micro-gyro, the PMMG has no evident mass-spring component in its structure, so it has larger stiffness and robust resistance to shake and strike. Therefore, the PMMG can be used in the high-g environment especially, such as the fuse of smart munitions. In this paper, first, the working mechanism of the PMMG is proposed. Then, two kinds of models of the PMMG are introduced, one of which is the piezoelectric rectangular parallelepiped with driving electrodes or sensing electrodes on the top and bottom surface of the body (model 1), and the other is the piezoelectric rectangular parallelepiped with concentrated masses at four corners of the top and bottom surface of the body (model 2). For the two kinds of models, the modal and harmonic analyses are conducted, and the working mode of the PMMG is obtained based on the finite element method (FEM) analysis results. It is found that for model 2 the resonance frequency of working mode is lower than that of model 1 and the vibration directivity is improved. The fabrication processes and the controlling circuits of the PMMG are detailed in this paper. The PMMG prototype test validated the results of vibration analysis of the PMMG. The introduction of concentrated masses can lower the resonance frequency and improve the vibration directivity of the working mode of the PMMG. The work in this paper provides the theoretical and experimental foundation for realizing this novel kind of micromachined gyroscope.

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Piezoelectric vibratory gyroscope using flexural vibration of a triangular bar

Cited by 23 publications

References 2 publications

Coaxial Vibratory Gyroscope Using Two Pairs of Degenerate Modes

Coaxial Vibratory Gyroscope Using Two Pairs of Degenerate Modes

Model Design of Piezoelectric Micromachined Modal Gyroscope

Vibration analysis of a piezoelectric micromachined modal gyroscope (PMMG)

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