International Journal of Mechanical Sciences最新文献

{"title":"Coupled vibration model-driven intelligent fault diagnosis in canned motor pumps","authors":"Jintao Yao ,&nbsp;Taibo Yang ,&nbsp;Zhihao Bi ,&nbsp;Jiaxin Liu ,&nbsp;Qingbo He ,&nbsp;Zhike Peng","doi":"10.1016/j.ijmecsci.2025.110181","DOIUrl":"10.1016/j.ijmecsci.2025.110181","url":null,"abstract":"<div><div>Canned motor pumps have an unobservable internal structure, making it impossible to directly monitor their operational states or measure the transfer function from internal excitations to casing vibrations. This limitation poses significant challenges in accurately linking internal faults to measurable external signals. To address this issue, this study establishes a coupled vibration model of the canned motor pump to describe the transmission process from impeller hydraulic excitation to casing vibrations. Based on this model, four fault dynamic models are developed to simulate casing vibrations under different fault conditions, supporting fault mechanism analysis. Additionally, a model-based intelligent diagnostic framework is proposed, enabling accurate fault diagnosis under imbalanced data conditions. Experimental results show that the proposed method effectively captures fault characteristic frequency variations consistent with actual conditions. The spectrum of the simulated signals reflects clear physical significance, providing a robust basis for understanding fault mechanisms and improving the reliability and precision of fault diagnosis. This work offers a novel solution for linking internal fault dynamics to external measurements for canned motor pumps, providing a practical potential for handling imbalanced data and advancing fault diagnosis in complex enclosed mechanical systems.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"291 ","pages":"Article 110181"},"PeriodicalIF":7.1,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface quality in ultrasonic-electrolytic internal grinding of GCr15 steel","authors":"Hongyin Zhang,&nbsp;Feng Jiao,&nbsp;Xiaoxu Lian,&nbsp;Yuehan Zhao,&nbsp;Ying Niu,&nbsp;Jinglin Tong","doi":"10.1016/j.ijmecsci.2025.110188","DOIUrl":"10.1016/j.ijmecsci.2025.110188","url":null,"abstract":"<div><div>To tackle the issues of poor surface quality, grinding burn, microcrack and deformation in conventional grinding, in this paper, combined the merits of ultrasonic vibration and electrolytic grinding, the material removal characteristics of GCr15 steel in longitudinal torsional ultrasonic electrolytic internal grinding were revealed based on the kinematic analysis of single abrasive particle. Additionally, a theoretical analysis of the heights of material removed by electrolytic action and mechanical grinding was conducted. The single factor experiments were completed for conventional grinding (CG), longitudinal torsional ultrasonic grinding (LTUG), electrolytic grinding (EG) and longitudinal torsional ultrasonic electrolytic grinding (LTUEG). The results demonstrated the superiority of LTUEG processing through comparisons with CG, LTUG and EG. LTUEG shows significant advantages in reducing grinding force, improving surface roughness and quality, and achieving ideal microhardness and residual stress. The formation and removal mechanism of the passivation film were elucidated. The passivation film was primarily composed of iron oxides, hydroxides, and precipitates of the C element. Increasing the voltage helped to increase the thickness of the passive film and reduce the actual grinding depth; however, excessively high voltages could easily lead to residual passive film coverage and electrolytic burn phenomena. The influence of different processing parameters on surface quality was investigated. Within a certain range, increasing the ultrasonic amplitude, voltage, and grinding wheel speed, while decreasing the feed speed, had a beneficial effect on enhancing the surface quality. Therefore, LTUEG is an effective processing method to improve the quality of GCr15 steel.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"291 ","pages":"Article 110188"},"PeriodicalIF":7.1,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Composition and layered co-continuous structure co-regulate shape memory properties","authors":"Feng Yang ,&nbsp;Haofan He ,&nbsp;Jiye Jia ,&nbsp;Ping Wu ,&nbsp;Pei Feng ,&nbsp;Cijun Shuai","doi":"10.1016/j.ijmecsci.2025.110187","DOIUrl":"10.1016/j.ijmecsci.2025.110187","url":null,"abstract":"<div><div>4D printed shape memory implant is highly promising for the realization of minimally invasive, while challenged by the poor shape memory effect (SME) of commonly used biodegradable shape memory polymer (SMP) such as poly(L-lactic acid) (PLLA) and thermoplastic polyurethane (TPU). Herein, the shape memory bone scaffold was fabricated by laser powder bed fusion (LPBF) with layered co-continuous structures containing PLLA and TPU. And SME of the scaffold was ameliorated by regulating the material composition and constructing a special layered co-continuous structure for the first time. The layered co-continuous structure could avoid the impact of morphology on SME due to the immiscibility between PLLA and TPU, thus broadening the window of tuning the SME. As the ratio of PLLA and TPU decreased gradually, the shape fixity ratio (R_f) decreased and the shape recovery ratio (R_r) increased. This was attributed to the combination of changes in the ratio of \"switching segment and netpoint\" and the reverse stiffness effect between PLLA and TPU. Besides, due to the efficient stress transfer in the layered co-continuous structure, the R_f and R_r would be considerably changed only when the content threshold of the switching segment or netpoint was reached. A good SME was obtained when the ratio of TPU to PLLA was 2:1, with R_f of 96.5 % and R_r of 96.71 % compared to the pure PLLA. Additionally, the scaffold exhibited sufficient compressive strength and benign cytocompatibility. This study proposed a new and simple but effective strategy to prepare bone scaffold with excellent shape memory properties.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"291 ","pages":"Article 110187"},"PeriodicalIF":7.1,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of charge carriers on elastic waves in piezoelectric semiconductors","authors":"Wanli Yang ,&nbsp;Songliang Zhang ,&nbsp;Lingyun Guo,&nbsp;Yuantai Hu","doi":"10.1016/j.ijmecsci.2025.110180","DOIUrl":"10.1016/j.ijmecsci.2025.110180","url":null,"abstract":"<div><div>The performance of piezotronic devices is primarily governed by the interaction between elastic waves and charge carriers. Therefore, understanding the underlying mechanisms of this interaction in piezoelectric semiconductors is crucial for the research and development of piezotronic devices. Unlike in purely elastic or piezoelectric media, an elastic wave propagating in a piezoelectric semiconductor involves two interdependent physical processes: the evolution process of thermodynamic state, and the vibration state of elastic wave-front. The former is from the evolution of carrier behavior and the latter is related to the dynamic characteristics of polarization electric field. The mutual competition between two dynamic processes stimulates the interaction between electric field and charge carriers, i.e., appearing a field-particle coupling wave (FPCW). This coupling wave is useful in remaking elastic wave-front characteristics to develop new acoustoelectric devices or to prompt performance of piezoelectric semiconductor devices. Thus, a multi-field coupling dynamic model is established to analyze the relationship between polarized electric field and charge carriers at the elastic wave-front. Furthermore, the distinct coupling mechanisms of these processes at varying vibration frequencies are examined. It is found that a vibration state of an elastic wave-front was altered by the corresponding thermodynamic state most severely at a low-frequency situation, significantly at a medium-frequency one and almost none at a high-frequency one. Correspondingly, a FPCW becomes most pronounced due to strong competition between two dynamic processes in a medium-frequency situation, and very weak in the other two ones. Furthermore, it is revealed in the paper that the nonlinear behavior in drift current is to transfer energy to higher order vibration modes instead of being consumed as claimed from the harmonic analysis technique. These findings are of great significance for designing passive delay line filters, amplifiers, and circulators, etc.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"291 ","pages":"Article 110180"},"PeriodicalIF":7.1,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-sensor blade tip timing with multi-source information and adaptive dictionary update","authors":"Wenkang Huang ,&nbsp;Haifeng Hu ,&nbsp;Yongmin Yang ,&nbsp;Zifang Bian ,&nbsp;Minghao Pan ,&nbsp;Bohao Xiao ,&nbsp;Fengjiao Guan","doi":"10.1016/j.ijmecsci.2025.110178","DOIUrl":"10.1016/j.ijmecsci.2025.110178","url":null,"abstract":"<div><div>Blade tip timing (BTT) has emerged as a critical non-contact vibration measurement technique, increasingly supplanting traditional strain gauge methods for monitoring the operational safety of high-speed rotating machinery, such as aircraft engines and gas turbines. Despite its advantages, conventional BTT approaches face several limitations: undersampling often leads to the loss of high-frequency signals; the requirement for multiple sensors and stringent layout specifications escalates system complexity and cost; and dependence on a single displacement data source restricts the extraction of comprehensive vibration features. Furthermore, traditional BTT methods lack adaptability to varying operating conditions, impeding accurate signal reconstruction. To overcome these challenges, this study proposes a novel dual-sensor BTT sparse reconstruction method. This approach leverages multi-source information, including both displacement and velocity data, to adapt to diverse operating conditions. It employs a dynamic dictionary update process based on the primary frequency range during sparse reconstruction, eliminating the need for at least four sensors to reconstruct synchronous vibration signals under constant speed conditions. This innovation reduces sensor layout constraints and enhances the robustness and accuracy of signal reconstruction. The proposed method is experimentally validated using dual capacitive and dual eddy current sensors for vibration signal identification. The results indicate that integrating multi-source information significantly improves the accuracy and reliability of vibration signal reconstruction, rendering the method highly effective for health monitoring and fault diagnosis in high-speed rotating machinery.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"291 ","pages":"Article 110178"},"PeriodicalIF":7.1,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Configuration performance of main shaft bearings for transient-loaded wind turbine","authors":"Shuai Cheng ,&nbsp;Xianghui Meng ,&nbsp;Jiabao Yin ,&nbsp;Liang Yang ,&nbsp;Jiajia Zhang","doi":"10.1016/j.ijmecsci.2025.110171","DOIUrl":"10.1016/j.ijmecsci.2025.110171","url":null,"abstract":"<div><div>Wind turbine (WT) main shaft bearings are currently dominated by rolling bearings. However, as the power capacity of WT increases, sliding bearings with lower cost and higher reliability present a more advantageous alternative. During the gradual application of sliding bearings, issues of high friction and wear have emerged. Due to the lack of tribological analysis methods for main shaft sliding bearings, it is difficult to reveal their friction and wear mechanisms and conduct optimized design. To address this, a novel and systematic 6-degree-of-freedom tribo-dynamic model for the main shaft sliding bearing system is developed, incorporating the elastic deformation of composite bearing pads. Based on this model, the effects of various pad configurations of segmented journal/thrust bearings on the tribo-dynamic performance under startup wind loads are analyzed. The results indicate that transient wind loads place the main shaft in a low-speed, high-load state, leading to a decline in oil film lubrication performance during the startup phase. Under these conditions, the 9-Pad journal bearing creates a more compatible radial clearance between shaft and pads, enhancing oil film performance and reducing surface contact. This improvement is attributed to the deformation at the edges of composite pads. The thrust bearing pad configurations affect both the dynamics of main shaft and the tribology of journal/thrust bearings, with the 6-Pad showing certain advantages. These findings can provide guidance for the configuration design of sliding bearings in WT main shaft.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110171"},"PeriodicalIF":7.1,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptive sound insulation of piezoelectric metastructure shells around ring and coincidence frequencies","authors":"Huaibing Yuan ,&nbsp;Yisheng Zheng ,&nbsp;Wujun Feng ,&nbsp;Yegao Qu ,&nbsp;Yajun Luo ,&nbsp;Huageng Luo","doi":"10.1016/j.ijmecsci.2025.110175","DOIUrl":"10.1016/j.ijmecsci.2025.110175","url":null,"abstract":"<div><div>To address the soundproof limitations of conventional shells around the ring and coincidence frequencies, this study proposes and investigates a locally resonant piezoelectric metastructure shell (meta-shell) for sound insulation. An electrical-mechanical-acoustic coupling model of the meta-shell is established using the plane-wave expansion method (PWEM). The sound transmission loss (STL) of the meta-shell is computed analytically and further validated through finite-element simulations. It is found that, under oblique incidence of sound waves, the meta-shell exhibits obvious enhancement of STL around the ring and coincidence frequencies when the piezoelectric shunting is properly tuned. The dispersion relations of elastic waves and sound waves are analyzed to elaborate the sound-insulation mechanism. Furthermore, it is demonstrated that the STL around the ring and coincidence frequencies can be improved simultaneously when the high-order resonant shunting circuits are introduced. Due to the high tunability of piezoelectric shuntings, the meta-shell could maintain superior sound-insulation performance under varying incidence angles of sound waves and Mach numbers of fluids, which inevitably lead to the shift of coincidence frequencies. It is not easy for mechanical meta-shells to adapt to such varying conditions. Overall, this research provides physical insights of sound insulation of locally resonant piezoelectric meta-shells, offering valuable guidance for designing smart acoustic skins of aircrafts.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110175"},"PeriodicalIF":7.1,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solitary-wave-based deep learning for compressive strength estimation in cementitious materials","authors":"Sangyoung Yoon ,&nbsp;Boohyun An ,&nbsp;Chan Yeob Yeun ,&nbsp;Ernesto Damiani ,&nbsp;Malik Khalfan ,&nbsp;Tae-Yeon Kim","doi":"10.1016/j.ijmecsci.2025.110170","DOIUrl":"10.1016/j.ijmecsci.2025.110170","url":null,"abstract":"<div><div>This study presents a novel deep learning (DL)-based approach for predicting the compressive strength of cementitious materials using highly nonlinear solitary waves (HNSWs) as input data. The proposed method leverages convolutional neural networks (CNNs) to classify compressive strength of mortar by transforming continuous measurements into discrete categories. Four different formats of HNSW signals are explored to evaluate the impact of signal preprocessing on model performance. Multiple mode testing is implemented to enhance the robustness of predictions, using multiple signals from the same class to reduce variability and stabilize results. The DL models were tested on datasets varying by water-to-cement (w/c) ratios and hydration time, achieving superior performance through signal slicing and frequency-domain transformations. Notably, the model achieved high prediction accuracy, with R² values up to 0.989 and RMSE as low as 0.930 MPa, demonstrating its reliability for predicting compressive strength in cementitious materials. Comparative analyses with benchmark architectures such as AlexNet, GoogleNet, and ResNet-18 highlight the effectiveness of the tailored CNN model, which consistently outperforms these benchmarks, especially in multiple mode testing.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"291 ","pages":"Article 110170"},"PeriodicalIF":7.1,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hierarchical anisogrid cylindrical shells: Design, additive manufacture and imperfection analyses","authors":"Yiling Lin ,&nbsp;Hualin Fan","doi":"10.1016/j.ijmecsci.2025.110174","DOIUrl":"10.1016/j.ijmecsci.2025.110174","url":null,"abstract":"<div><div>Anisogrid cylindrical structures (ACS) are widely used in aerospace applications as load-bearing components, but their susceptibility to local buckling and the need for thicker skins in larger structures pose challenges for lightweight design. To address these limitations, this study proposes a hierarchical anisogrid cylindrical shell (HACS) with fractal skin, fabricated using laser powder bed fusion (L-PBF). The mechanical properties and failure modes of HACSs with varying volume fractions were compared to those of traditional anisogrid cylindrical shells (TACSs) through experimental, finite element modeling (FEM), and theoretical analyses. The results reveal that the hierarchical design significantly improves buckling resistance and load-bearing capacity, with the fractal skin enabling a transition from elastic to plastic failure modes at low volume fractions and increasing load capacity by 53.12 %. Manufacturing defects were found to reduce mechanical performance, particularly in the fractal skin, while a size-corrected FEM demonstrated strong agreement with experimental data. A theoretical failure analysis model was also developed to predict structural deformation, offering a reliable tool for evaluating lattice cylinder performance. This study aims to provide new insights into the means of enhancing the bearing capacity of lattice cylinders through the application of hierarchical design and additive manufacture.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110174"},"PeriodicalIF":7.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carrier-doping effect on strength and deformations in group-IV crystals","authors":"Hiroki Sakakima,&nbsp;Satoshi Izumi","doi":"10.1016/j.ijmecsci.2025.110169","DOIUrl":"10.1016/j.ijmecsci.2025.110169","url":null,"abstract":"<div><div>Understanding the mechanical properties of semiconductor materials in carrier-rich environments is crucial for ensuring the reliability of devices operating under such conditions. This study examines the impact of excess carrier doping on the ideal tensile and shear strengths of Si, 3C-SiC, and diamond through first-principles calculations. High electron doping density (5.0 × 10²¹ cm⁻³) significantly reduces ideal tensile strength by approximately 60 %, 20 %, and 40 % in Si, 3C-SiC, and diamond, respectively, while hole doping enhances it by 28 %, 30 %, and 7 %. Crystal orbital Hamilton population analysis could not fully explain the strength modification mechanism in diamond as consistently as in Si and 3C-SiC. Alternatively, these effects can be understood through modifications in the interaction forces between neighboring atoms, driven by changes in charge distribution. For shear deformation along the <span><math><mrow><mo>[</mo><mrow><mn>11</mn><mover><mn>2</mn><mo>¯</mo></mover></mrow><mo>]</mo></mrow></math></span> direction, electron doping increases shear strength by approximately 10 % in Si and 3C-SiC but decreases it by 5 % in diamond, owing to structural instability under high shear. Conversely, hole doping decreases shear strength in Si and 3C-SiC but slightly increases it in diamond. In the [<span><math><mrow><mover><mn>1</mn><mo>¯</mo></mover><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></math></span>] direction, electron doping decreases shear strength by up to 20 % in all materials, whereas hole doping decreases it by 30 % in Si and has minimal effects on 3C-SiC and diamond. The effects of excess carriers on ideal shear strength can also be interpreted through alterations in the resistive forces between the bonds. These findings suggest that excess carriers modify mechanical properties by altering charge density distribution, affecting bond repulsion and deformation resistance.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110169"},"PeriodicalIF":7.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}