A dynamical model of subharmonic generation in ultrasonic infrared thermography

Zheng, Kai; Zhang, Hui; Zhang, Shuyi; Fan, Li‐Wu

doi:10.1016/j.ultras.2006.05.166

Cited by 7 publications

(12 citation statements)

References 8 publications

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“…As known in Fig. 7, the response obtained with the model in [7] is gradually damped and indicates that only transient responses are obtained by the model. Comparatively, the vibration obtained by our model is a steady response excited by the ultrasonic gun, which demonstrates the model in this work can ensure the heating efficiency induced by the vibration of the specimen and improve the detection capability.…”

Section: Resultsmentioning

confidence: 69%

“…To explore the advantages of the model, the comparative analysis between the results obtained by the model in this work and by that in [7] is carried out. Two models are calculated based on the parameters in this work, and the corresponding results are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…(1) In the case of X 1 < X 2 , i.e. M 1 is separated from M 2 , the motion equations can be deduced as follows: It is noted that the parameters used in this work are partly obtained by [7,9] and partly obtained by experiments.…”

Section: "Double-mass-three-spring" Modelmentioning

confidence: 99%

“…But, they didn't consider the vibration of specimen. Involving the vibration of specimen, Zheng et al [7] proposed a "double-mass-double-spring" model for the generation of nonlinear vibration in vibrothermogrphy, in which the ultrasonic horn and the specimen were viewed as a "contact-collision" particle pair. The obtained results illustrate the specimen motion stimulated by the ultrasonic horn and the generation mechanism of nonlinear vibration.…”

Section: Introductionmentioning

confidence: 99%

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Investigation Into Vibration Characteristic in Vibrothermography

et al. 2019

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Vibration characteristic plays an important role in vibrothermography, which directly affects the heating during the test. In this work, involving all the contacts in the vibrothermography, the "double-mass-three-spring" model is established to explore the vibration characteristic. The obtained results show that ultrasonic gun vibrates at fundamental frequency (FF), while the specimen vibrates at multi-frequencies including FF, 2FF, 3FF, and 4FF, which is validated through experimental investigation results. Additionally, the model proposed in this work reveals a high order harmonics in the vibrothermography test and makes the specimen conduct the steady vibration, which indicates that the model is closer to the practical equipment and can ensure the heating efficiency induced by vibration of specimen to improve the detection capability.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: "Double-mass-three-spring" Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation Into Vibration Characteristic in Vibrothermography

et al. 2019

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“…Therefore, except vibration nonlinearity, the model cannot be used to explain any other phenomena. Zheng [7] designed a different mechanical model based on contact-impact mechanism, which described elaborately the interaction between ultrasonic horn and target. Recently, Han [8] has published some experimental results that the engagement force can sharply inflect the vibration characteristics and defect heating, and an appropriate engagement force can improve probability of detection (POD).…”

Section: Introductionmentioning

confidence: 99%