Development  of  Bolt-Clamped Langevin-Type Transducer     with  High Mechanical Quality Factor   for Excitation of Large  Torsional Vibration

Adachi, Kazunari; Konno, Yuji; Masaki, S.

doi:10.1143/jjap.33.1182

Cited by 20 publications

(14 citation statements)

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“…However, since we have not established the method yet for obtaining the dielectric loss at the resonance frequency, this paper adopts tan d' = 0.002 and 0.027 at the off-resonance (1 kHz) for the hard and soft PZT's, respectively, for the loss analysis described below. Figure 4C,D shows the electromechanical coupling factor k 31 and piezoelectric constant d 31 change with vibration velocity for the hard and soft PZT's using Equation s (8) and (9). The electromechanical coupling factor for both samples increased, the change rate (3.5% per 0.1 m/s) for the hard PZT is less than the rate (5.3% per 0.1 m/s) for the soft PZT.…”

Section: Dielectric Permittivitymentioning

confidence: 98%

“…DC bias stress and electric field are of particular importance for study because the actuators and transducers are often used in these circumstances to stabilize or enhance the operation performance . So‐called bolt‐clamped Langevin transducers provided enhancement in the transducer characteristics, which is related to the external preload stress …”

Section: Introductionmentioning

confidence: 99%

“…7 So-called bolt-clamped Langevin transducers provided enhancement in the transducer characteristics, which is related to the external preload stress. 8,9 Regarding the bias electric field effect, previous reports [10][11][12] clarified the stabilization mechanism of the high-power performance in "Hard" Pb(Zr,Ti)O 3 (PZT)based ceramics in terms of the "internal" bias field. As shown in Figure 1A, the mechanical quality factor Q m in the hard PZT increases rather gradually after the electric poling process (~2 hours) to reach to the value higher than 1000, whereas the soft PZT does not change the Q m value with time lapse.…”

Section: Introductionmentioning

confidence: 99%

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Improving high‐power properties of PZT ceramics by external DC bias field

et al. 2018

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This paper concludes that the deterioration of the mechanical quality factor Qm when operated under high power, can be recovered by externally applying positive DC bias field. Material constants for piezoelectric ceramics are generally characterized under low‐power conditions. However, high‐power properties deviate significantly from the ones measured under low‐power conditions (Qm degrades by a factor of ~2). DC Bias field helps to recover the properties of the ceramic under high‐power conditions. The DC bias field of 200 V/mm exhibits an almost equivalent “opposite” change rate to the vibration velocity of 0.1 m/s. It is also notable that the piezoelectric loss tan θ’ can be decreased most effectively under positive DC bias field (1.9% per 100 V/mm for the hard PZT and 3.1% per 100 V/mm for the soft PZT), in comparison with the elastic or dielectric losses. This report presents a comprehensive analysis on the low‐ and high‐power piezoelectric properties of hard and soft Lead Zirconate Titanates (PZT's) under externally applied DC bias field in the k31 resonance mode (transverse extensional).

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Section: Dielectric Permittivitymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving high‐power properties of PZT ceramics by external DC bias field

et al. 2018

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“…The position corresponds to a node in the vibration displacement. However, it is very difficult to accurately predict the node of longitudinal vibration, the in-plane vibration, on the surface of a metal block of the transducer [21][22][23][24]. Various vibration modes are superposed, such as the axial mode that vibrates longitudinally along the central axis of the transducer fastened with bolt, and the flexural mode that vibrates longitudinally caused by the disk-type piezoelectric vibrators fixed around the bolt.…”

Section: Introductionmentioning

confidence: 99%

Experimental method for vibration analysis of a bolt-clamped ultrasonic transducer

Kim

2023

Acoust. Sci. & Tech.

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The vibration mode of a bolt-clamped ultrasonic transducer was experimentally analyzed. In the experiment, a designed and manufactured semicircular wedge-shaped jig was used to apply constant pressure to a narrow band-shaped area on the lateral side of the transducer. Constant force was applied to the jig with a vise and a torque wrench. As the position of the pressure applied by the jig moved along the length of the transducer, the change of the input admittance characteristic of the transducer was observed. Each vibration mode was analyzed from the change in the magnitude and the resonant frequency of the input admittance. The proposed method made it possible to practically determine the position of the node for each vibration mode, and is expected to provide useful information to utilize the harmonic modes.

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“…the contact point is identical to the direction of the flexural vibration of the radiation plate. The radiation impedance at the point P on the radiation plate is defined as the ratio of the pressure, p, to the velocity, V(x, z), and is given by (2) where the thickness of the radiation plate. Figure 7 represents the design chart for the maximum load resistance of the radiation plate of 50 mm in height as a function of the width, and the thickness of the radiation plate as a function of the width.…”

Section: Introductionmentioning

confidence: 99%

Design of a radiation plate for load testing of the torsional transducers.

Takakusaki

Satonobu

Koike

et al. 1999

J. Acoust. Soc. Jpn. (E), J Acoust Soc Jpn E

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This paper presents a design method of a radiation plate with high load resistance for load testing of the torsional transducers. The calculation method for the torsional load impedance of the radiation plate seen from the transducer is proposed considering the flexural vibration mode excited in the radiation plate. The theoretical study using this calculation method indicates that the use of the "stripe" flexural vibration mode has advantage over the use of the "lattice" mode in controlling and obtaining a high load resistance. Furthermore, by using a combination of changing the node number of the stripe vibration mode and changing the thickness of the radiation plate, the design of the wide radiation plate which achieves a high load resistance without changing the resonant frequency is attempted. In an experimental study, the measured torsional load resistance of the prototype radiation plate agrees with the calculated one, and the torsional load resistance of 4.7 Nms was achieved with a 223 mm X 50 mm radiation plate where the fifth stripe flexural vibration mode was excited. Load testing of the torsional transducer with the high torsional load was effectively conducted using the radiation plate designed by the proposed method.

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Development of Bolt-Clamped Langevin-Type Transducer with High Mechanical Quality Factor for Excitation of Large Torsional Vibration

Cited by 20 publications

References 0 publications

Improving high‐power properties of PZT ceramics by external DC bias field

Improving high‐power properties of PZT ceramics by external DC bias field

Experimental method for vibration analysis of a bolt-clamped ultrasonic transducer

Design of a radiation plate for load testing of the torsional transducers.

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