Deep learning based ultrasonic reconstruction of rough surface morphology
Ultrasonics. 2024 Feb 13;138:107265. doi: 10.1016/j.ultras.2024.107265. Online ahead of print.ABSTRACTThis paper introduces a methodology to recover the morphology of a complex rough surface from ultrasonic pulse echo measurements with an array of equidistant sensors using the one dimensional convolution neural network (1DCNN). The neural network is trained by the datasets simulated from high-fidelity finite element simulations for surfaces with a range of roughness parameters and is tested on both numerical and real experimental data. To assess the performance of our proposed method, the rough surface reconstruction resul...
Source: Ultrasonics - February 14, 2024 Category: Physics Authors: Zhengjun Wang Fan Shi Fangxin Zou Source Type: research
A novel waveguide rod with acoustic black hole for acoustic emission signal enhancement and its performance
Ultrasonics. 2024 Feb 9;138:107260. doi: 10.1016/j.ultras.2024.107260. Online ahead of print.ABSTRACTAs an essential auxiliary tool for acoustic emission (AE) detection, waveguide rods are widely used in testing situations where sensors cannot contact the specimens directly, such as high temperature, cryogenic, corrosion, radiation, etc. However, the AE signal attenuation in waveguide rod makes the risk of missing weak acoustic emission events in damage detection, which limits the application of waveguide rods. Therefore, in this work, a novel waveguide rod was presented based on acoustic black hole (ABH) theory to enhance...
Source: Ultrasonics - February 14, 2024 Category: Physics Authors: Ji Fu Tian He Zhenyu Liu Yue Bao Xiandong Liu Source Type: research
Deep learning based ultrasonic reconstruction of rough surface morphology
Ultrasonics. 2024 Feb 13;138:107265. doi: 10.1016/j.ultras.2024.107265. Online ahead of print.ABSTRACTThis paper introduces a methodology to recover the morphology of a complex rough surface from ultrasonic pulse echo measurements with an array of equidistant sensors using the one dimensional convolution neural network (1DCNN). The neural network is trained by the datasets simulated from high-fidelity finite element simulations for surfaces with a range of roughness parameters and is tested on both numerical and real experimental data. To assess the performance of our proposed method, the rough surface reconstruction resul...
Source: Ultrasonics - February 14, 2024 Category: Physics Authors: Zhengjun Wang Fan Shi Fangxin Zou Source Type: research
A novel waveguide rod with acoustic black hole for acoustic emission signal enhancement and its performance
Ultrasonics. 2024 Feb 9;138:107260. doi: 10.1016/j.ultras.2024.107260. Online ahead of print.ABSTRACTAs an essential auxiliary tool for acoustic emission (AE) detection, waveguide rods are widely used in testing situations where sensors cannot contact the specimens directly, such as high temperature, cryogenic, corrosion, radiation, etc. However, the AE signal attenuation in waveguide rod makes the risk of missing weak acoustic emission events in damage detection, which limits the application of waveguide rods. Therefore, in this work, a novel waveguide rod was presented based on acoustic black hole (ABH) theory to enhance...
Source: Ultrasonics - February 14, 2024 Category: Physics Authors: Ji Fu Tian He Zhenyu Liu Yue Bao Xiandong Liu Source Type: research
Deep learning based ultrasonic reconstruction of rough surface morphology
Ultrasonics. 2024 Feb 13;138:107265. doi: 10.1016/j.ultras.2024.107265. Online ahead of print.ABSTRACTThis paper introduces a methodology to recover the morphology of a complex rough surface from ultrasonic pulse echo measurements with an array of equidistant sensors using the one dimensional convolution neural network (1DCNN). The neural network is trained by the datasets simulated from high-fidelity finite element simulations for surfaces with a range of roughness parameters and is tested on both numerical and real experimental data. To assess the performance of our proposed method, the rough surface reconstruction resul...
Source: Ultrasonics - February 14, 2024 Category: Physics Authors: Zhengjun Wang Fan Shi Fangxin Zou Source Type: research
A novel waveguide rod with acoustic black hole for acoustic emission signal enhancement and its performance
Ultrasonics. 2024 Feb 9;138:107260. doi: 10.1016/j.ultras.2024.107260. Online ahead of print.ABSTRACTAs an essential auxiliary tool for acoustic emission (AE) detection, waveguide rods are widely used in testing situations where sensors cannot contact the specimens directly, such as high temperature, cryogenic, corrosion, radiation, etc. However, the AE signal attenuation in waveguide rod makes the risk of missing weak acoustic emission events in damage detection, which limits the application of waveguide rods. Therefore, in this work, a novel waveguide rod was presented based on acoustic black hole (ABH) theory to enhance...
Source: Ultrasonics - February 14, 2024 Category: Physics Authors: Ji Fu Tian He Zhenyu Liu Yue Bao Xiandong Liu Source Type: research
The impact of ischemic vascular stenosis on LIPU hyperthermia efficacy investigated Based on in vivo rabbit limb ischemia model
Ultrasonics. 2024 Feb 10;138:107263. doi: 10.1016/j.ultras.2024.107263. Online ahead of print.ABSTRACTIschemic diseases due to arterial stenosis or occlusion are common and can have serious consequences if untreated. Therapeutic ultrasound like high-intensity focused ultrasound (HIFU) ablates tissues while low-intensity pulsed ultrasound (LIPU) promotes healing at relatively low temperatures. However, blood vessel cooling effect and reduced flow in ischemia impact temperature distribution and ultrasonic treatment efficacy. This work established a rabbit limb ischemia model by ligating the femoral artery, measuring vascular...
Source: Ultrasonics - February 13, 2024 Category: Physics Authors: Chunbing Zhang Yiyun Wu Qi Zhang Meimei Zhang Dong Zhang Source Type: research
Characterization of three-dimensional surface-breaking slots based on regression analysis of ultrasonic Rayleigh wave simulations
Ultrasonics. 2024 Feb 10;138:107261. doi: 10.1016/j.ultras.2024.107261. Online ahead of print.ABSTRACTRayleigh waves travel along the surface of a solid structure, with most of their energy focusing within a depth of one wavelength. Thus, the reflection coefficient from a surface-breaking crack is highly sensitive to the ratio between the crack depth and the wavelength. It is possible to characterize the depth of surface-breaking cracks by measuring the features in the reflected waves. However, a feature value can correspond to multiple depth-wavelength ratios, i.e., the mapping is non-univalent, which brings difficulties ...
Source: Ultrasonics - February 13, 2024 Category: Physics Authors: Shengyuan Zhang Zheng Fan Source Type: research
Can Mn:PIN-PMN-PT piezocrystal replace hard piezoceramic in power ultrasonic devices?
Ultrasonics. 2024 Feb 2;138:107257. doi: 10.1016/j.ultras.2024.107257. Online ahead of print.ABSTRACTMn:PIN-PMN-PT piezocrystal is investigated to determine whether its enhanced energy density makes it a candidate transducer material for power ultrasonics applications. To this end, the electromechanical and vibrational characteristics of a simple configuration of a bolted Langevin transducer (BLT) and then an ultrasonic surgical device, both incorporating Mn:PIN-PMN-PT piezocrystal, are compared with the same transducer configurations incorporating a conventional hard PZT piezoceramic commonly used in high-power ultrasonic...
Source: Ultrasonics - February 9, 2024 Category: Physics Authors: Xuan Li Nicola Giuseppe Fenu Nathan Giles-Donovan Sandy Cochran Margaret Lucas Source Type: research
Numerical modeling with experimental verification investigating the effect of various nonlinearities on the sideband peak count-index technique
Ultrasonics. 2024 Feb 7;138:107259. doi: 10.1016/j.ultras.2024.107259. Online ahead of print.ABSTRACTA newly developed nonlinear ultrasonic (NLU) technique called sideband band peak count-index (or SPC-I) measures the degree of nonlinearity in materials by counting the sideband peaks above a moving threshold line - larger the SPC-I values, higher is the material nonlinearity. In various published papers, the SPC-I technique has shown its effectiveness in structural health monitoring (SHM) applications. However, the effects of different types of nonlinear phenomenon on the sideband peak generation is yet to be investigated ...
Source: Ultrasonics - February 9, 2024 Category: Physics Authors: Guangdong Zhang Bo Hu Hamad Alnuaimi Umar Amjad Tribikram Kundu Source Type: research
A novel 3D evaluation method for surface defects using broadband laser-generated Rayleigh waves with wavenumber analysis
Ultrasonics. 2024 Feb 5;138:107258. doi: 10.1016/j.ultras.2024.107258. Online ahead of print.ABSTRACTTo address the issues of large imaging errors for small defects and the difficulty in depth evaluation using local wavenumber estimation for surface defect imaging, a novel three-dimensional (3D) evaluation method for surface defects using broadband laser-generated Rayleigh waves with wavenumber analysis is proposed. A finite element model is established to investigate the interaction between the Rayleigh wave and the surface defect and reveal the wavenumber change mechanism of the non-dispersive Rayleigh wave in the case o...
Source: Ultrasonics - February 9, 2024 Category: Physics Authors: Qichao Cheng Jun He Shixi Yang Xin Xiong Yongshui Luo Source Type: research
Transcranial ultrasound estimation of viscoelasticity and fluidity in brain tumors aided by transcranial shear waves
Ultrasonics. 2024 Feb 6;138:107262. doi: 10.1016/j.ultras.2024.107262. Online ahead of print.ABSTRACTCerebral diseases, such as brain tumors, are intricately linked to the mechanical properties of brain tissues. Estimating the mechanical properties of brain tumors using transcranial ultrasound is a promising approach. However, the complexity of cranial features introduces challenges, such as ultrasound attenuation and interference from multidirectional transcranial shear waves induced by impact vibrations. To address these issues, this study proposes a transcranial ultrasound estimation method assisted by transcranial shea...
Source: Ultrasonics - February 8, 2024 Category: Physics Authors: Jianjun Yu Hao Guo Xiaoyang Qiao Liyuan Jiang Yiran Chen Jiacheng Liu Chaoyang Zhang Xiao Su Hongmei Zhang Mingxi Wan Source Type: research
Ultrasound k-nearest neighbor entropy imaging: Theory, algorithm, and applications
In this study, we introduced the k-nearest neighbor (KNN) algorithm to estimate entropy values and proposed ultrasound KNN entropy imaging. The proposed KNN estimator leveraged the Euclidean distance between data samples, rather than the histogram bins by conventional PDH estimators. We also proposed cumulative relative entropy (CRE) imaging to analyze time-series radiofrequency signals and applied it to monitor thermal lesions induced by microwave ablation (MWA). Computer simulation phantom experiments were conducted to validate and compare the performance of the proposed KNN entropy imaging, the conventional PDH entropy ...
Source: Ultrasonics - February 7, 2024 Category: Physics Authors: Sinan Li Po-Hsiang Tsui Weiwei Wu Shuicai Wu Zhuhuang Zhou Source Type: research
Piezoelectric-laser ultrasonic inspection and monitoring of thin-walled structure fabricated by directed energy deposition process based on guided waves
Ultrasonics. 2024 Jan 28;138:107255. doi: 10.1016/j.ultras.2024.107255. Online ahead of print.ABSTRACTThin-walled metallic structures produced by the Directed Energy Deposition (DED) Additive Manufacturing (AM) process are prone to various fabrication defects, which hinder the wider applications of the technique in practice. In-situ inspection and monitoring methodologies are in high demand for improved quality control of printed parts. This paper presents an ultrasonic guided-wave-based method and a prototype that can potentially be used for in-situ inspection of thin-walled structures produced by DED. Lamb waves are exci...
Source: Ultrasonics - February 5, 2024 Category: Physics Authors: Fuzhen Wen Shiming Gao Xu Song Fan Shi Source Type: research
Ultrasonic imaging of delamination in thick CFRP laminates using an energy-compensation reverse time migration method
Ultrasonics. 2024 Jan 28;138:107253. doi: 10.1016/j.ultras.2024.107253. Online ahead of print.ABSTRACTIn ultrasonic reflection method, the precision of defect detection in thick carbon fiber reinforced plastics (CFRP) is compromised by acoustic energy attenuation. An energy-compensation reverse time migration (ECRTM) method is proposed to identify multiple defects accurately. Forward and backward wavefields are formed using the finite element method within an anisotropic acoustic model based on the Christoffel equation and Bond transformation. To enhance the imaging quality of CFRP laminates, a novel cross-correlation imag...
Source: Ultrasonics - February 3, 2024 Category: Physics Authors: Hongjuan Yang Zhengyan Yang Sitong Lu Yinan Shan Jitong Ma Lei Yang Zhanjun Wu Source Type: research
