国际机械系统动力学学报(英文)最新文献_第10页

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

Nonlinear stochastic dynamics research on a Lorenz system with white Gaussian noise based on a quasi-potential approach 基于拟势方法的高斯白噪声Lorenz系统的非线性随机动力学研究

国际机械系统动力学学报(英文) Pub Date : 2022-12-31 DOI: 10.1002/msd2.12062

Yong Huang

{"title":"Nonlinear stochastic dynamics research on a Lorenz system with white Gaussian noise based on a quasi-potential approach","authors":"Yong Huang","doi":"10.1002/msd2.12062","DOIUrl":"https://doi.org/10.1002/msd2.12062","url":null,"abstract":"Environmental noise can lead to complex stochastic dynamical behaviors in nonlinear systems. In this paper, a Lorenz system with the parameter region with two stable fixed points and a chaotic saddle subject to white Gaussian noise is investigated as an example. Noise-induced phenomena, such as noise-induced quasi-cycle, three-state intermittency, and chaos, are observed. In the intermittency process, the optimal path used to describe the transition mechanism is calculated and confirmed to pass through an unstable periodic orbit, a chaotic saddle, a saddle point, and a heteroclinic trajectory in an orderly sequence using generalized cell mapping with a digraph method constructively. The corresponding optimal fluctuation forces are delineated to uncover the effects of noise during the transition process. Then the process will switch frequently between the attractors and the chaotic saddle as noise intensity increased further, that is, noise induced chaos emerging. A threshold noise intensity is defined by stochastic sensitivity analysis when a confidence ellipsoid is tangent to the stable manifold of the periodic orbit, which agrees with the simulation results. It is finally reported that these results and methods can be generalized to analyze the stochastic dynamics of other nonlinear mechanical systems with similar structures.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"3 1","pages":"85-94"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50148835","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

A localized Fourier collocation method for 2D and 3D elliptic partial differential equations: Theory and MATLAB code 二维和三维椭圆型偏微分方程的局部傅里叶配置方法:理论和MATLAB代码

国际机械系统动力学学报(英文) Pub Date : 2022-12-13 DOI: 10.1002/msd2.12061

Yan Gu, Zhuojia Fu, Mikhail V. Golub

引用次数: 3

Influence of multiple structural parameters on buffer performance of a thin-walled circular tube based on the coupling modeling technique 基于耦合建模技术的多结构参数对薄壁圆管缓冲性能的影响

国际机械系统动力学学报(英文) Pub Date : 2022-12-13 DOI: 10.1002/msd2.12060

Kun Jiang, Xinggan Lu, Hao Wang

{"title":"Influence of multiple structural parameters on buffer performance of a thin-walled circular tube based on the coupling modeling technique","authors":"Kun Jiang, Xinggan Lu, Hao Wang","doi":"10.1002/msd2.12060","DOIUrl":"10.1002/msd2.12060","url":null,"abstract":"Pyrotechnic devices are widely used in the aerospace and defense industries. However, these devices generate high-frequency and high-amplitude shock responses during their use, compromising safe operation of the system. In this paper, the application of a thin-walled circular tube as the energy absorber in pyrotechnic devices is investigated. To accurately predict the shock load and the buffer performance of the thin-walled circular tube, a coupled model connecting the energetic material combustion and finite element simulation is established. The validity of the coupled model is verified by comparing with experiments. Then, the collapse mechanism of the thin-walled circular tube is studied, and the influence of multiple structural parameters on its buffer performance is analyzed. The results show that the thin-walled circular tube effectively reduces the shock overload. The maximum shock overload reduced from 572 612g to 11 204g in the studied case. The structural parameters of the thin-walled circular tube mainly affect the deformation process and the maximum shock overload. The order of importance of structural parameters to the maximum shock overload is determined, among which the wall thickness has the most significant effect.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"2 4","pages":"374-390"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12060","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124731501","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

Generation mechanism and control of high-frequency vibration for tracked vehicles 履带车辆高频振动的产生机理及控制

国际机械系统动力学学报(英文) Pub Date : 2022-12-13 DOI: 10.1002/msd2.12059

Pingxin Wang, Xiaoting Rui, Feifei Liu, Guoping Wang, Hailong Yu, Bin He, Junjie Gu

{"title":"Generation mechanism and control of high-frequency vibration for tracked vehicles","authors":"Pingxin Wang, Xiaoting Rui, Feifei Liu, Guoping Wang, Hailong Yu, Bin He, Junjie Gu","doi":"10.1002/msd2.12059","DOIUrl":"https://doi.org/10.1002/msd2.12059","url":null,"abstract":"A crawler system provides much larger ground contact, leading to excellent terrain adaptability. Due to its structural characteristics, high-frequency vibration proportional to the vehicle speed is generated during the driving process. This is a result of the polygon and rolling effects between the track and the wheels. A field test of a tracked vehicle is performed to monitor movement signals of the chassis and a rocker arm. Their corresponding power spectral density distributions confirm the correctness of the frequency-calculation equation. Then, a novel elastic track tensioning device with a damper is designed as a cushion between the idler and the chassis. Depending on its geometry, the equivalent damping coefficient for a dynamic model is evaluated. Subsequently, the damping is altered in response to different operating conditions by a hybrid damping fuzzy semiactive control system. The controller accounts for both chassis and track vibration. Based on the transfer matrix method for multibody systems, a dynamical model of the track system is developed. Control performances are evaluated using two numerical simulations of obstacle crossing and off-road driving operations. Results indicate that the proposed semiactive tensioner is substantially better than the conventional one. This paper provides a novel feasible scheme for vibration reduction of tracked vehicles.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"3 2","pages":"146-161"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50131411","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

Development and stability analysis of a high-speed train bearing system under variable speed conditions 高速列车变速轴承系统的研制与稳定性分析

国际机械系统动力学学报(英文) Pub Date : 2022-12-06 DOI: 10.1002/msd2.12057

Baosen Wang, Yongqiang Liu, Bin Zhang, Shaopu Yang

{"title":"Development and stability analysis of a high-speed train bearing system under variable speed conditions","authors":"Baosen Wang, Yongqiang Liu, Bin Zhang, Shaopu Yang","doi":"10.1002/msd2.12057","DOIUrl":"10.1002/msd2.12057","url":null,"abstract":"During a high-speed train operation, the train speed changes frequently, resulting in motion change as a function of time. A dynamic model of a double-row tapered roller bearing system of a high-speed train under variable speed conditions is developed. The model takes into consideration the structural characteristics of one outer ring and two inner rings of the train bearing. The angle iteration method is used to determine the rotation angle of the roller within any time period, solving the difficult problem of determining the location of the roller. The outer ring and inner ring faults are captured by the model, and the model response is obtained under variable speed conditions. Experiments are carried out under two fault conditions to validate the model results. The simulation results are found to be in good agreement with the results of the formula, and the errors between the simulation results and the experimental results when the bearing has outer and inner ring faults are found to be, respectively, 5.97% and 2.59%, which demonstrates the effectiveness of the model. The influence of outer ring and inner ring faults on system stability is analyzed quantitatively using the Lempel–Ziv complexity. The results show that for low train acceleration, the inner ring fault has a more significant effect on the system stability, while for high acceleration, the outer ring fault has a more significant effect. However, when the train acceleration changes, the outer ring has a greater influence. In practice, train acceleration is usually small and does not frequently change in one operation cycle. Therefore, the inner ring fault of the bearing deserves more attention.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"2 4","pages":"352-362"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124686999","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: 2

Dynamics of triboelectric nanogenerators: A review 摩擦电纳米发电机动力学研究进展

国际机械系统动力学学报(英文) Pub Date : 2022-11-14 DOI: 10.1002/msd2.12058

Guoqiang Xu, Chuanyang Li, Chaojie Chen, Jingjing Fu, Tingting Hou, Yunlong Zi

{"title":"Dynamics of triboelectric nanogenerators: A review","authors":"Guoqiang Xu, Chuanyang Li, Chaojie Chen, Jingjing Fu, Tingting Hou, Yunlong Zi","doi":"10.1002/msd2.12058","DOIUrl":"10.1002/msd2.12058","url":null,"abstract":"Triboelectric nanogenerators (TENGs) represent a promising next-generation renewable energy technology. TENGs have become increasingly popular for harvesting vibration energy in the environment due to their advantages of lightweight, broad range of material choices, low cost, and no pollution. However, issues such as input force irregularity, working bandwidth, efficiency calculation, and dynamic modeling hinder the use of TENGs in industrial or practical applications. In this paper, the modeling process of the dynamical system of a TENG is reviewed from the perspective of energy flow. In addition, this paper reviews the main contributions made in recent years to achieve optimized output based on springs, magnetic forces, and pendulums, and introduces different ways to increase the bandwidth of TENGs. Finally, the main problems of TENGs in the process of harvesting vibration energy are discussed. This review may serve as a practical reference for methods to convert irregular mechanical input sources into optimized output performance toward the commercialization of TENGs.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"2 4","pages":"311-324"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123665174","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: 5

Full-field out-of-plane vibration displacement acquisition based on speckle-projection digital image correlation and its application in damage localization 基于散斑投影数字图像相关的全场面外振动位移采集及其在损伤定位中的应用

国际机械系统动力学学报(英文) Pub Date : 2022-11-04 DOI: 10.1002/msd2.12055

Shancheng Cao, Jinwei Yan, Haibo Nian, Chao Xu

{"title":"Full-field out-of-plane vibration displacement acquisition based on speckle-projection digital image correlation and its application in damage localization","authors":"Shancheng Cao, Jinwei Yan, Haibo Nian, Chao Xu","doi":"10.1002/msd2.12055","DOIUrl":"10.1002/msd2.12055","url":null,"abstract":"Stereo-digital image correlation (Stereo-DIC) has been widely explored for modal analysis in plate-type structures due to its noncontact and full-field advantages. However, when the traditional stereo-DIC is adopted to capture the out-of-plane displacements, several challenging issues exist such as the development of surface speckles, asynchronous camera recording, and efficiency and accuracy degradation due to high computation costs. Moreover, with the captured out-of-plane displacements, effective and efficient evaluation of the high spatial resolution mode shapes and their application to damage localization are also critical problems. To tackle these issues, a speckle-projection DIC technique using a single high-speed camera is proposed to obtain the out-of-plane vibration displacements. Moreover, an enhanced peak-picking modal analysis method is adopted to enhance the estimation accuracy and efficiency of mode shapes. In addition, the low-rank property of mode shapes in an intact state and the spatial sparse property of damage locations are harnessed for the detection of damage positions without requiring reference data on the healthy state. Finally, the modal analysis and damage localization results based on the proposed speckle-projection DIC are compared with those of the traditional two-camera stereo-DIC technique to verify its feasibility and effectiveness. It is found that the differences in the identified resonant frequencies between these two methods are smaller than 1% for higher modes. Moreover, the proposed speckle-projection DIC has the same accuracy as the traditional two-camera stereo-DIC in terms of measurement accuracy, mode shape estimation, and damage localization.","PeriodicalId":60486,"journal":{"name":"国际机械系统动力学学报(英文)","volume":"2 4","pages":"363-373"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/msd2.12055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127242262","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: 2