Construction of Torsional-Vibration Systems with  a Hollow Cylindrical Bolt-Clamped Langevin-Type Transducer   and Their Application to Ultrasonic Plastic Welding

Adachi, Kazunari; Saito, M.

doi:10.1143/jjap.34.2735

Cited by 15 publications

(14 citation statements)

References 1 publication

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“…Since mechanically robust transducers of this type can generate high-amplitude ultrasonic vibrations, they are widely used as efficient vibratory sources in many high-power ultrasonic technologies such as ultrasonic plastic joining. 10,11) The BLTs can thus be expected to have potential use in high-power transformers.…”

Section: Proposed Structure Of the Piezoelectric Transformermentioning

confidence: 99%

Construction of a low-frequency high-power piezoelectric transformer with a specified step-up voltage transformation ratio using two identical bolt-clamped Langevin-type transducers

Adachi

Konno

Kosugi

2015

Jpn. J. Appl. Phys.

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We propose a low-frequency piezoelectric transformer comprising two identical bolt-clamped Langevin-type transducers (BLTs) and a stepped horn with a half-wavelength straight extension. The transformer can realize a specified step-up voltage transformation ratio as determined by the cross-sectional area ratio of the horn whose both ends the two BLTs are connected to, and the driving frequency at which the specified transformation ratio is realized can be set near its mechanical resonance. Thus, it can be mechanically held firmly at its vibratory node without affecting the mechanical vibration mode or resulting in a loss of energy. After relevant finite-element simulations, experiments were conducted for a trial-fabricated transformer of the above type. As a result, the experimental results predicted by the simulations were obtained in step-up operation. The influence of the load resistance on the deviation of the driving frequency from its total mechanical resonance of 53.1 kHz was found to be less than 130 Hz (0.24% of the resonance frequency) only. High-power performance of the piezoelectric transformer was also demonstrated.

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Section: Proposed Structure Of the Piezoelectric Transformermentioning

confidence: 99%

Construction of a low-frequency high-power piezoelectric transformer with a specified step-up voltage transformation ratio using two identical bolt-clamped Langevin-type transducers

Adachi

Konno

Kosugi

2015

Jpn. J. Appl. Phys.

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“…L The amplitude amplification factor of the torsional angular velocity R T is given by using the polar moment of the inertia of area ratio used in the conventional stepped horn without a hollow part as where I I and p p 1 2 are the polar moments of inertia of area of parts 1 and 2, respectively. 22,28) Using Eq. ( 2), the amplitude amplification factor of the torsional vibration displacement amplitude ¢ R T at the outer periphery of both ends becomes…”

Section: Longitudinal-torsional Vibration Sourcementioning

confidence: 99%

Design and experimental investigation of stepped horn with a hollow part to allow individual design of amplitude amplification factors for longitudinal-torsional vibration source

Asami

Miura

2022

Jpn. J. Appl. Phys.

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In the ultrasonic vibration-assisted manufacturing method using complex vibration, the amplitude amplification factor of horn for each vibration is important. In this paper, we focus on longitudinal-torsional vibration as a complex vibration and propose a stepped horn with a hollow part as a horn that can design the amplification factors of these vibrations individually. The proposed equation for the amplification factor of the horn with a hollow part was derived from the equation of the conventional step horn without a hollow part, and the validity of the proposed equation was verified by the finite element method (FEM) and experimental measurements. As a result, the validity of the equation was confirmed, and it was clarified that the proposed stepped horn with a hollow part can be individually designed for the amplitude amplification factors of longitudinal vibration and torsional vibration.

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“…Typical ultrasound transducers are fabricated from a single 56 piezoelectric disc to generate acoustic pressure waves, or use 57 a bolt-clamped langevin type design to generate mechanical 58 motion [5]. The transparent glass windowed ultrasound 59 transducers took advantages from both types of transducers 60 designs.…”

Section: A Design 55mentioning

confidence: 99%

Transparent glass-windowed ultrasound transducers

Yddal

Kotopoulis

Gilja

et al. 2014

2014 IEEE International Ultrasonics Symposium

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Glass windowed ultrasound transducers have 1 several potential uses ranging from multi-modal research 2 (ultrasound and optics) to industrial application in oil and gas 3 or chemistry.4In our work here we compare four different designs 5 for transparent glass windowed ultrasound transducers. Each 6 design was characterised using field scanning, radiation force 7 measurements, frequency sensitivity measurement and FEM 8 simulations. 9Field scans showed that small variations in design can greatly 10 affect the size and location of the acoustic focus. The results 11 coincided with those seen in the simulations. Radiation force 12 measurements showed that the devices were able to easily exceed 13 acoustic powers of 10 W, with efficiencies of up to 40%. Isostatic 14 simulations shows that the design also affects the physical 15 strength of the devices. Current designs were able to withstand 16 between 300 and 700 psi on the front surface. 17 The devices were cost effective due to the minimal amount 18 of materials necessary and the simple fabrication process. More 19 work needs to be done to improve the power output and stress 20 handling capabilities. 21 I. INTRODUCTION 22 Optical measurements are a cornerstone of today's 23 technology, they are widely used for measuring speed and 24 distance, performing chemical analysis, and more [1], [2]. 25 Optical equipment draws great advantages from modern 26 micro-electronics knowledge, making it extremely compact. 27 Nevertheless, optical equipment tends to be very susceptible 28 to physical damage hence needs to be shielded and requires an 29 optically clear path, e.g., a glass window. Some environments 30 makes this difficult to obtain, for example measurements 31 in oil pipes where crude oil will attach to the optical 32 measurement window. Ultrasound is also used in several 33 chemical production techniques to homogenise emulsions, and 34 optical spectroscopy is required to evaluate the quality of the 35 emulsion. Currently such problems are solved by measuring 36 after emulsification and evaluating the quality of the finished 37 product [3].38 In our work here, we aim to solve such problems by creating 39 an optically transparent transducer. The cavitational effects of 40 the ultrasound can be used to clean the optical window or 41 homogenise emulsions, whilst the optically clear path allows a 42 vast range of optical based measurements, from spectroscopy, 43 to high-frame rate imaging cameras, or optical microscopy.

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Construction of Torsional-Vibration Systems with a Hollow Cylindrical Bolt-Clamped Langevin-Type Transducer and Their Application to Ultrasonic Plastic Welding

Cited by 15 publications

References 1 publication

Construction of a low-frequency high-power piezoelectric transformer with a specified step-up voltage transformation ratio using two identical bolt-clamped Langevin-type transducers

Construction of a low-frequency high-power piezoelectric transformer with a specified step-up voltage transformation ratio using two identical bolt-clamped Langevin-type transducers

Design and experimental investigation of stepped horn with a hollow part to allow individual design of amplitude amplification factors for longitudinal-torsional vibration source

Transparent glass-windowed ultrasound transducers

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