Advances in nonlinear ultrasonic detection of microcracks

Sun, Di; Zhu, Wujun; Xiang, Yanxun; Xuan, Fu‐Zhen

doi:10.1360/tb-2021-0798

Cited by 4 publications

(3 citation statements)

References 75 publications

(84 reference statements)

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“…In addition, Wang et al 16) showed that when the initial mass fraction of silicon in the molten iron is 0.10% to 0.26%, the molten iron can obtain a better dephosphorization efficiency. Sun et al 17) showed that the increase of initial silicon content in molten iron can improve the dephosphorization efficiency, but the increase of initial SiO 2 in dephosphorizing agent has no obvious effect on dephosphorization. Therefore, the pre-desiliconized and dephosphorized molten iron should maintain a certain range of Si content, and the experimental molten iron can meet the requirements of subsequent converter dephosphorization.…”

Section: Influence Of the Proportion Of Sinter Return Ore On The Elem...mentioning

confidence: 99%

Effect of Sinter Return Ore Addition on Dephosphorization Behaviour of Hot Metal

Zhou,

Chen,

Zhao

et al. 2023

ISIJ Int.

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：In order to make better use of sinter return ore and iron oxide scale to achieve effective pre-dephosphorization of molten iron, the effects of final slag morphology, mineral phase structure and polymerization degree on pre-dephosphorization were studied by theoretical analysis, XRD, SEM-EDS, Raman and FTIR spectra. The results show that when the proportion of sinter return ore is less than 20%, the impact on dephosphorization is relatively small. The structural analysis of dephosphorization final slag shows that the increase of sinter return ore will lead to the decrease of phosphorus content in phosphorus-rich phase and the increase of RO phase and iron-rich phase in slag. O 2destroys P-O-P bond more than Si-O-Si bond. When the phosphorus entering the slag decreases, the content of Q 0 (Si) structure decreases, and silicon tends to exist in the form of higher polymerization degree. With the increase of the proportion of sinter return ore, the structure of [FeO 6 ] 9in slag increases, which is not conducive to the migration of phosphorus. When the oxidant is only sinter return ore, the proportion of Q 1 (Si) and P-O-Si structure in slag increases obviously, and the evolution of silicate structure is the main reason for the change of polymerization degree of slag. This study can provide theoretical reference and technical basis for the effective utilization of sinter return ore and the reduction of production cost in iron and steel enterprises.

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Section: Influence Of the Proportion Of Sinter Return Ore On The Elem...mentioning

confidence: 99%

Effect of Sinter Return Ore Addition on Dephosphorization Behaviour of Hot Metal

Zhou,

Chen,

Zhao

et al. 2023

ISIJ Int.

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show abstract

“…Furthermore, the deployment of personnel into the internal blade cavities poses numerous risks. Recent technological advancements have introduced novel approaches such as ultrasonic detection [1], infrared thermography [2], and sensor-equipped aerial platforms [3][4], notably quadcopter drones. Ultrasonic technology enables non-intrusive inspections, whereas infrared thermography identifies issues through temperature distribution analysis.…”

Section: Introductionmentioning

confidence: 99%

Research on inspection of wind turbine blade inner cavity by unmanned aerial vehicle based on binocular stereovision

li,

xu,

zhou

et al. 2024

Third International Conference on Electronic Information Engineering, Big Data, and Computer Technology (EIBDCT 2024)

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Wind turbine generators, which convert wind energy into electricity, require particularly crucial inspection of their internal blade cavities. To achieve precise inspection of the internal blade cavities, a quadcopter drone was designed with collision prevention capabilities and equipped with dual-camera stereo vision to obtain 3D point cloud reconstruction and achieve three-dimensional defect coordinate localization. The application of this advanced technology significantly enhances the efficiency of internal blade cavity inspections. During on-site testing, the drone effectively navigated a 32-meter-long blade cavity, reducing safety risks and providing precise defect location information for subsequent maintenance. This study not only keeps inspection personnel away from hazardous areas but also enables inspections to cover regions inaccessible to individuals, thereby ensuring the safe and stable operation of wind power generation.

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“…As depicted in Figure 1, materials commonly employed in the aerospace industry include aluminum alloys and composite materials, which are prone to developing microscopic cracks during operation [36]. Even small cracks can pose a serious threat to flight safety, particularly in extreme atmospheric conditions [37]. Consequently, regular structural health monitoring has become exceptionally important.…”

Section: Introductionmentioning

confidence: 99%

Second Harmonic Modulation for Ultrasonic Signals Based on the Design of the Phononic Crystal Filter

Zhu,

Zhao,

Cao

2023

Sensors

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Nonlinear ultrasonic non-destructive testing (NDT) is a widely used method for detecting micro-damages in various materials and structures due to its high sensitivity and directional capability. However, the extraction and modulation of extremely weak nonlinear ultrasonic signals is quite a challenge in practical applications. Therefore, this paper focuses on the second harmonic modulation signal method in nonlinear ultrasonic NDT and proposes the design of the phononic crystal filter (PC filter) to achieve this filtering function. Through finite element simulations, it is demonstrated that the filtering frequency of the filter is influenced by the structural configuration, material wave speed, and geometric characteristics. Then, the design method for cubic PC filters is established. Furthermore, a time-domain finite element method is introduced to verify the filtering ability of the filter and further validate the rationality of this design approach.

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Advances in nonlinear ultrasonic detection of microcracks

Cited by 4 publications

References 75 publications

Effect of Sinter Return Ore Addition on Dephosphorization Behaviour of Hot Metal

Effect of Sinter Return Ore Addition on Dephosphorization Behaviour of Hot Metal

Research on inspection of wind turbine blade inner cavity by unmanned aerial vehicle based on binocular stereovision

Second Harmonic Modulation for Ultrasonic Signals Based on the Design of the Phononic Crystal Filter

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