国际机械系统动力学学报(英文)最新文献_第5页

A local spectrum enhancement-based method and its application in incipient fault diagnosis of rotating machinery 一种基于局部谱增强的旋转机械早期故障诊断方法及其应用

国际机械系统动力学学报(英文) Pub Date : 2023-06-12 DOI: 10.1002/msd2.12076

Jiancong Shi, Baoming Xu, Xinglong Wang, Jun Zhang

{"title":"A local spectrum enhancement-based method and its application in incipient fault diagnosis of rotating machinery","authors":"Jiancong Shi, Baoming Xu, Xinglong Wang, Jun Zhang","doi":"10.1002/msd2.12076","DOIUrl":"https://doi.org/10.1002/msd2.12076","url":null,"abstract":"Incipient faults of gears and rolling bearings in rotating machineries are very difficult to identify using traditional envelope analysis methods. To address this challenge, this paper proposes an effective local spectrum enhancement-based diagnostic method that can identify weak fault frequencies in the original complicated raw signals. For this purpose, a traversal frequency band segmentation technique is first proposed for dividing the raw signal into a series of subfrequency bands. Then, the proposed synthetic quantitative index is constructed for selecting the most informative local frequency band (ILFB) containing fault features from the divided subfrequency bands. Furthermore, an improved grasshopper optimization algorithm-based stochastic resonance (SR) system is developed for enhancing weak fault features contained in the selected most ILFB with less computation cost. Finally, the enhanced weak fault frequencies are extracted from the output of the SR system using a common spectrum analysis. Two experiments on a laboratory planetary gearbox and an open bearing data set are used to verify the effectuality of the proposed method. The diagnostic results demonstrate that the proposed method can identify incipient faults of gears and bearings in an effective and accurate manner. Furthermore, the advantages of the proposed method are highlighted by comparison with other methods.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"3 2","pages":"162-172"},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50129731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of micro-elongated thermoelastic medium loaded with a piezoelectric layer under the influence of gravity using the dual-phase-lag model 用双相滞后模型研究重力作用下加载压电层的细长热弹性介质

国际机械系统动力学学报(英文) Pub Date : 2023-06-08 DOI: 10.1002/msd2.12075

Mohamed I. A. Othman, Ebtesam E. M. Eraki, Mohamed F. Ismail

引用次数: 0

Multiple control of thermoelectric dual-function metamaterials 热电双功能超材料的多重控制

国际机械系统动力学学报(英文) Pub Date : 2023-05-12 DOI: 10.1002/msd2.12070

Pengfei Zhuang, Jiping Huang

{"title":"Multiple control of thermoelectric dual-function metamaterials","authors":"Pengfei Zhuang, Jiping Huang","doi":"10.1002/msd2.12070","DOIUrl":"https://doi.org/10.1002/msd2.12070","url":null,"abstract":"Thermal metamaterials based on transformation theory offer a practical design for controlling heat flow by engineering spatial distributions of material parameters, implementing interesting functions such as cloaking, concentrating, and rotating. However, most existing designs are limited to serving a single target function within a given physical domain. Here, we analytically prove the form invariance of thermoelectric (TE) governing equations, ensuring precise controls of the thermal flux and electric current. Then, we propose a dual-function metamaterial that can concentrate (or cloak) and rotate the TE field simultaneously. In addition, we introduce two practical control methods to realize corresponding functions: one is a temperature-switching TE rotating concentrator cloak that can switch between cloaking and concentrating; the other is an electrically controlled TE rotating concentrator that can handle the temperature field precisely by adjusting external voltages. The theoretical predictions and finite-element simulations agree well with each other. This work provides a unified framework for manipulating the direction and density of the TE field simultaneously and may contribute to the study of thermal management, such as thermal rectification and thermal diodes.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"3 2","pages":"127-135"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50130416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Development of new electromagnetic suspension–based high-speed Maglev vehicles in China: Historical and recent progress in the field of dynamical simulation 中国新型电磁悬挂高速磁悬浮车辆的发展——动力学仿真领域的历史与最新进展

国际机械系统动力学学报(英文) Pub Date : 2023-03-26 DOI: 10.1002/msd2.12069

Sansan Ding, Peter Eberhard, Georg Schneider, Patrick Schmid, Arnim Kargl, Yong Cui, Ullrich Martin, Xin Liang, Chao Huang, Markus Bauer, Florian Dignath, Qinghua Zheng

引用次数: 0

Effect of coronary artery dynamics on the wall shear stress vector field topological skeleton in fluid–structure interaction analyses 流体-结构相互作用分析中冠状动脉动力学对壁剪切应力矢量场拓扑骨架的影响

国际机械系统动力学学报(英文) Pub Date : 2023-03-16 DOI: 10.1002/msd2.12068

Harry J. Carpenter, Mergen H. Ghayesh, Anthony C. Zander, Peter J. Psaltis

{"title":"Effect of coronary artery dynamics on the wall shear stress vector field topological skeleton in fluid–structure interaction analyses","authors":"Harry J. Carpenter, Mergen H. Ghayesh, Anthony C. Zander, Peter J. Psaltis","doi":"10.1002/msd2.12068","DOIUrl":"https://doi.org/10.1002/msd2.12068","url":null,"abstract":"In this paper, we investigate the impact of coronary artery dynamics on the wall shear stress (WSS) vector field topology by comparing fluid–structure interaction (FSI) and computational fluid dynamics (CFD) techniques. As one of the most common causes of death globally, coronary artery disease (CAD) is a significant economic burden; however, novel approaches are still needed to improve our ability to predict its progression. FSI can include the unique dynamical factors present in the coronary vasculature. To investigate the impact of these dynamical factors, we study an idealized artery model with sequential stenosis. The transient simulations made use of the hyperelastic artery and lipid constitutive equations, non-Newtonian blood viscosity, and the characteristic out-of-phase pressure and velocity distribution of the left anterior descending coronary artery. We compare changes to established metrics of time-averaged WSS (TAWSS) and the oscillatory shear index (OSI) to changes in the emerging WSS divergence, calculated here in a modified version to handle the deforming mesh of FSI simulations. Results suggest that the motion of the artery can impact downstream patterns in both divergence and OSI. WSS magnitude is also decreased by up to 57% due to motion in some regions. WSS divergence patterns varied most significantly between simulations over the systolic period, the time of the largest displacements. This investigation highlights that coronary dynamics could impact markers of potential CAD progression and warrants further detailed investigations in more diverse geometries and patient cases.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"3 1","pages":"48-57"},"PeriodicalIF":0.0,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50135224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wave control of a flexible space tether based on elastic metamaterials 基于弹性超材料的柔性空间系链波浪控制

国际机械系统动力学学报(英文) Pub Date : 2023-03-16 DOI: 10.1002/msd2.12067

Yexiong Huang, Enmin Chen, Jialiang Sun, Dongping Jin

引用次数: 1

Nonlinear stochastic dynamics of an array of coupled micromechanical oscillators 耦合微机械振荡器阵列的非线性随机动力学

国际机械系统动力学学报(英文) Pub Date : 2023-03-13 DOI: 10.1002/msd2.12066

Maria I. Katsidoniotaki, Ioannis Petromichelakis, Ioannis A. Kougioumtzoglou

{"title":"Nonlinear stochastic dynamics of an array of coupled micromechanical oscillators","authors":"Maria I. Katsidoniotaki, Ioannis Petromichelakis, Ioannis A. Kougioumtzoglou","doi":"10.1002/msd2.12066","DOIUrl":"https://doi.org/10.1002/msd2.12066","url":null,"abstract":"The stochastic response of a multi-degree-of-freedom nonlinear dynamical system is determined based on the recently developed Wiener path integral (WPI) technique. The system can be construed as a representative model of electrostatically coupled arrays of micromechanical oscillators, and relates to an experiment performed by Buks and Roukes. Compared to alternative modeling and solution treatments in the literature, the paper exhibits the following novelties. First, typically adopted linear, or higher-order polynomial, approximations of the nonlinear electrostatic forces are circumvented. Second, for the first time, stochastic modeling is employed by considering a random excitation component representing the effect of diverse noise sources on the system dynamics. Third, the resulting high-dimensional, nonlinear system of coupled stochastic differential equations governing the dynamics of the micromechanical array is solved based on the WPI technique for determining the response joint probability density function. Comparisons with pertinent Monte Carlo simulation data demonstrate a quite high degree of accuracy and computational efficiency exhibited by the WPI technique. Further, it is shown that the proposed model can capture, at least in a qualitative manner, the salient aspects of the frequency domain response of the associated experimental setup.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"3 1","pages":"3-11"},"PeriodicalIF":0.0,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50131801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A stall diagnosis method based on entropy feature identification in axial compressors 基于熵特征识别的轴流压缩机失速诊断方法

国际机械系统动力学学报(英文) Pub Date : 2023-02-03 DOI: 10.1002/msd2.12064

Yang Liu, Juan Du, Jichao Li, Yang Xu, Junqiang Zhu, Chaoqun Nie

{"title":"A stall diagnosis method based on entropy feature identification in axial compressors","authors":"Yang Liu, Juan Du, Jichao Li, Yang Xu, Junqiang Zhu, Chaoqun Nie","doi":"10.1002/msd2.12064","DOIUrl":"https://doi.org/10.1002/msd2.12064","url":null,"abstract":"A stall diagnosis method based on the entropy feature extraction algorithm is developed in axial compressors. The reliability of the proposed method is determined and a parametric sensitivity analysis is experimentally conducted for two different types of compressor stall diagnoses. A collection of time-resolved pressure sensors is mounted circumferentially and along the chord direction to measure the dynamic pressure on the casing. Results show that the stall and prestall precursor embedded in the dynamic pressures are identified through nonlinear feature perturbation extraction using the entropy feature extraction algorithm. Further analysis demonstrates that the prestall precursor with the peak entropy value is related to the unsteady tip leakage flow for the spike-type stall diagnosis. The modal wave inception with increasing amplitude is identified by the considerable increase of the entropy value. The flow field in the tip region indicates that the modal wave corresponds to the flow separation in the suction side of the rotor blade. The warning time is 100–300 rotor revolutions for both types of stall diagnoses, which is beneficial for stall control in different axial compressors. Moreover, a parametric study of the embedding dimension m, similar tolerance n, similar radius r, and data length N in the fuzzy entropy method is conducted to determine the optimal parameter setting for stall diagnosis. The stall warning based on the entropy feature extraction algorithm provides a new stall diagnosis approach in the axial compressor with different stall types. This stall warning can also be adopted as an online stability monitoring index when using the concept of active stall control.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"3 1","pages":"73-84"},"PeriodicalIF":0.0,"publicationDate":"2023-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12064","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50123950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Dynamic characteristics of large permanent magnet direct-drive generators considering electromagnetic–structural coupling effects 考虑电磁-结构耦合效应的大型永磁直驱发电机的动态特性

国际机械系统动力学学报(英文) Pub Date : 2023-02-02 DOI: 10.1002/msd2.12065

Qinkai Han, Xueping Xu, Zhihong Zhang, Yifeng Yan, Chao Peng, Fulei Chu

{"title":"Dynamic characteristics of large permanent magnet direct-drive generators considering electromagnetic–structural coupling effects","authors":"Qinkai Han, Xueping Xu, Zhihong Zhang, Yifeng Yan, Chao Peng, Fulei Chu","doi":"10.1002/msd2.12065","DOIUrl":"https://doi.org/10.1002/msd2.12065","url":null,"abstract":"Dynamic characteristics of large permanent magnet direct-drive generators (PMDGs) considering electromagnetic–structural coupling effects are analyzed in this study. Using the conformal mapping method, the scalar magnetic potential of the air gap magnetic field considering the slot effect is calculated. On the basis of the discrete current element and magnetic equivalent circuit model, the local magnetic saturation effect of the stator and rotor is quantitatively simulated and the air gap magnetic field intensity distribution is obtained via numerical simulation. A series of uniformly distributed equivalent electromagnetic springs are introduced to develop an electromagnetic–structural coupling finite element PMDG model. The proposed air gap field analysis method is verified by the finite element analysis results. On the basis of the test platform for the Goldwind 1.5 MW PMDG, both modal and dynamic response tests for the stator/rotor coupling system are conducted, and the results are compared with the natural frequencies, mode shapes, and vibration responses obtained using the numerical model. The effects of the air gap length and rotor speed on the natural frequencies of the coupling system are analyzed. The proposed model has the potential to accurately evaluate the PMDG vibration energy, avoiding resonance points, and maintaining stable operations of the unit.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"3 1","pages":"25-38"},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50117916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Free vibration of functionally graded sandwich plates in thermal environments 热环境中功能梯度夹层板的自由振动

国际机械系统动力学学报(英文) Pub Date : 2023-01-13 DOI: 10.1002/msd2.12063

Dongdong Li, Zongbai Deng, Guoping Chen

引用次数: 4