Finite Element Analysis of Sensitivity of Frequency-Change Force Sensor

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Piezoelectric vibratory tactile sensors have been studied for measuring the softness and hardness of an object. In this research, a novel piezoelectric vibratory tactile sensor with a horn-type longitudinal bar resonator was investigated. For improving the sensitivity of the vibratory tactile sensor, the shape of the longitudinal bar resonator was calculated by the finite element method. The sensitivity of these tactile sensors with modified resonators was experimentally shown. It was clarified that the sensitivity of the tactile sensor was increased by modifying the shape of a resonator. Then, in order to reduce the vibration displacement at the supporting point on the tactile sensor, vibration displacement analysis was performed. The dimensions of the resonator, which were not affected by the conditions of the supporting points, were determined. This horn-type longitudinal bar resonator is expected as a novel tactile sensor with high performance.

Section: Calculated Equivalent Mass Of the Resonatormentioning

confidence: 99%

A Study of Vibratory Tactile Sensor Using a Horn-Type Longitudinal Bar Resonator

Kudo

2010

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“…To develop such a sensor, the authors have studied an acceleration sensor utilizes the phenomenon that the resonance frequency of a bending vibrator changes by the axial force. [1][2][3][4][5][6][7][8][9][10][11][12] A new construction of the acceleration sensor using a cross-coupled vibrator is proposed here, and investigated experimentally. The sensor detects the acceleration from a change of vibration amplitude of the cross coupled vibrator.…”

Section: Introductionmentioning

confidence: 99%

Construction of Two-Axis Acceleration Sensor Using a Cross-Coupled Vibrator

Terada

Uetsuji

Sugawara

2012

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We describe an acceleration sensor composed of four vibration bars, with a detection mechanism in which the resonant frequencies of the four bars are brought close together. The bars are connected mechanically at the center, and a cross-shaped layout is used such that for any load direction, the sizes of the loads on the vibration bars mutually oppose each other. Using this structure, acceleration can be easily calculated by differential detection of the oscillation amplitude signals of each of the four vibration bars. The body of the sensor is made of stainless steel (SUS304). The volume of the experimental sample is about 76 ×76 ×8 mm3, and the resonance frequency and quality factor are about 1041 Hz and 87, respectively. The sensor characteristics are measured using the gravitational field, and the acceleration is changed by rotating the sensor around the axis along the length of the vibrator.

“…Then, the structures of one-and two-axis acceleration sensors were proposed, and investigated experimentally. [1][2][3][4][5][6][7][8] But, the characteristics of the two-axis sensor shoud be improved on the point that an signal from the other axis is detected. 9) As this reason, it is clarified that mass of the sensor rotates by acceleration in the plane.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Characteristics of Frequency-Change-Type Two-Axis Acceleration Sensor

Sugawara¹,

Kajiwara²

2012

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The characteristics of a frequency-change-type two-axis acceleration sensor must be improved on the point that an undesirable signal from the other axis direction is detected. The signal is caused by the rotation of mass in the sensor. Two methods for improving the characteristics are proposed here and investigated by finite-element analysis. First, the center of gravity in the sensor was moved to realize a linear motion of mass. As a result, the signal became very small from 5.1 to 0.4%, but the volume of the sensor increased by 28%. Next, the other method of adjusting the dimensions of a bent-type support bar was proposed to realize a linear motion of mass. The rotation was not observed when the signal was decreased to almost zero. The method is very useful from the standpoint of realizing the same volume as the sensor of the prototype.