Designing a Hollow Langevin Transducer for Ultrasonic Coring

Harkness, Patrick; Cardoni, Andrea; Russell, Jonathan; Lucas, Margaret

doi:10.4028/www.scientific.net/amm.24-25.65

Cited by 9 publications

(7 citation statements)

References 10 publications

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“…As expected, it is observed that both resonance and antiresonance are increased along with the mechanical pre-stressing (Arnold and Mu¨hlen, 2001a;Fu, 2005;Harkness et al, 2010). The variations of resonance value decreased when the mechanical pre-stress increased, thus leading to a tendency of stabilization.…”

Section: Preliminary Results: Resonances and Impedancesmentioning

confidence: 52%

“…There are a few recent studies on the influence of the mechanical pre-stressing on piezoelectric transducers (Adachi et al, 1998;Arnold and Mu¨hlen, 2001a;DeAngelis et al, 2015;Fu and Li, 2009;Han et al, 2008;Harkness et al, 2010;Jiang et al, 2017;Qiao and Wang, 2010;Xu et al, 2002). Some studies focus on experimental reports (Arnold and Mu¨hlen, 2001a;Qiao and Wang, 2010) with procedures and results relative to the resonances and impedances determination.…”

Section: Related Workmentioning

confidence: 99%

“…Further, in the experimental field, the quantification of bolt-fastening effect on wire bonding performance is investigated in (Han et al, 2008). Other papers evaluate the mechanical pre-stressing using computational techniques such as finite element methods (Adachi et al, 1998;DeAngelis et al, 2015;Harkness et al, 2010). In (Jiang et al, 2017), the authors use the resonance resistance as a reference to find the optimal level of pretightening force.…”

Section: Related Workmentioning

confidence: 99%

“…The mechanical pre-stressing plays an important role in the regular operation of the transducer by preventing tensile fractures of the ceramics (Neppiras, 1973;Van Randeraat and Setterington, 1974) during the expansion semi cycle. However, the mechanical pre-stressing causes changes in the frequency response of the transducer, so that resonances and electromechanical coupling factor (k-factor) (Arnold and Mu¨hlen, 2001a;DeAngelis et al, 2015;Fu and Li, 2009;Harkness et al, 2010;Qiao and Wang, 2010;Xu et al, 2002), losses and other characteristics are all affected (Adachi et al, 1998;Han et al, 2008;Jiang et al, 2017). Furthermore, the mechanical pre-stressing bias tends to degrade over time due to the mechanical efforts of the operation at high power and also at rest.…”

Section: Introductionmentioning

confidence: 99%

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New insights into the mechanical pre-stressing of piezotransducers

Arnold

Martins

2020

Journal of Intelligent Material Systems and Structures

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Although pre-stressing is a requirement for the operation of a high-power piezo transducers, its impact on the model, the performance and the design of such devices is still not yet fully covered in the literature. This work attempts to bridge this gap by analyzing how the components of the Butterworth-Van Dyke model, the resonances, electrical impedances, electromechanical coupling factor, mechanical losses, and the tuning inductance are determined as a function of mechanical pre-stress. We have employed the Butterworth Van-Dyke model to study piezoelectric transducers tightened with a range of pre-stressing levels (12.2–60.1 MPa). As expected, the experimental results indicate that the components of the Butterworth-Van Dyke model are dependent upon the mechanical pre-stressing. The conclusions point out that, under mechanical pre-stressing levels between a threshold value and 60.1 MPa, the transducers used in this work tend to stabilize and enhance their performances. Also, upon stabilization, the transducers can be tuned with a constant inductance, which may also aid the design of ultrasonic systems. Overall, this work contributes to the definition of pre-stressing levels and its relationship with the length of the transducer, the mechanical losses, and the tuning.

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Section: Preliminary Results: Resonances and Impedancesmentioning

confidence: 52%

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New insights into the mechanical pre-stressing of piezotransducers

Arnold

Martins

2020

Journal of Intelligent Material Systems and Structures

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“…Rod-type PETs, or Langevin-type, in their design contain a rear mass, piezoelectric ceramics and a radiating mass. Such transducers are used both in a liquid medium, for example, in underwater acoustics, and in the air -ultrasonic technological equipment, an ultrasonic motor, a piezotransducer, some medical equipment [1], rock drilling devices [2]. During operation, the transducer is subjected to opera-tional loads -electrical, mechanical, cavitation, thermal.…”

Section: Introductionmentioning

confidence: 99%

Study of the influence of the housing on the cooling efficiency of the piezoceramic electroacoustic Langevin-type transducer

Pershevska¹,

Drozdenko²,

Drozdenko³

et al. 2021

TAPR

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The object of research is thermal processes in Langevin-type piezoceramic electroacoustic transducers (PET), taking into account the housing. The piezoceramic electroacoustic transducers heat up during operation. Overheating of the converter leads to negative consequences, accompanied by a change in the parameters, characteristics of the device, as well as the failure of the converter. Or limitation on the duration and mode of operation, output power, current, amplitude and speed of oscillation of the converter. The paper investigates the effect of the housing on the temperature field of a Langevin-type PET by the finite element method, using modeling in SolidWorks. The results of temperature reduction of such cooling methods are shown: – filling the housing cavity with electrical insulating liquid, gas, a mixture of thermal paste; – use of holes in the housing; – changing the shape of the rear cover to have radiator side fins, vertical radiator fins, cylindrical radiator fins; – heat-resistant layer; – use of active air cooling at three different speeds. The most efficient 53 % and a uniform temperature field were found when filling with a mixture of thermal paste, but this solution is accompanied by additional experiments and a preparatory stage with the mixture. The cooling efficiency of 47 % was provided by active cooling – blowing with air, and this method requires additional equipment. Filling with insulating liquid gave a cooling efficiency of 27 % – an optimal result that does not require expensive investments. Slow blowing of the housing or adding only holes resulted in a decrease in the maximum heating temperature from 10 to 20 %, therefore, if the PET design allows the presence of holes, then it is necessary to rationally place them. Changing the shape of the back plate, heat-absorbing element, filling the housing with gas gave an efficiency decrease in the maximum temperature by 6–8 % compared to a closed housing with air. The research results make it possible to choose the optimal option for reducing the heating temperature of the Langevin-type PET to increase its efficiency and long-term trouble-free operation.

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Vibration characteristics of a piezoelectric disk laminated with an elastic disk

Piao

Kim

2016

J Mech Sci Technol

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Designing a Hollow Langevin Transducer for Ultrasonic Coring

Cited by 9 publications

References 10 publications

New insights into the mechanical pre-stressing of piezotransducers

New insights into the mechanical pre-stressing of piezotransducers

Study of the influence of the housing on the cooling efficiency of the piezoceramic electroacoustic Langevin-type transducer

Vibration characteristics of a piezoelectric disk laminated with an elastic disk

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