Pub Date : 2024-06-06DOI: 10.1177/10775463241256681
Yaru Liang, Lai Wei, Jing Zeng, Ren Luo, Qunsheng Wang
The hunting stability is an important issue for vehicle systems that determines the maximum operating speeds of the high-speed trains. In this paper, the research background for the three abnormal vibration phenomena of the high-speed trains caused by the hunting stability problems, including the “VIP Chair Shaking,” “Bogie Alarm,” and “Carbody Sway” problems, are introduced. Firstly, the reason why the vehicle hunting motion loses its stability is investigated from the viewpoint of wheel/rail contact relation. Then, a modified wheel profile is recommended in order to solve or relieve the stability problem, in which the slope at the flange root for the original wheel profile is decreased and the slope at the wheel tread end is increased. Furthermore, the numerical model for a high-speed passenger car is established to verify the dynamic performance of the modified wheel profile. Finally, the dynamic test for the vehicle equipped with the modified wheels is carried out using full-scale roller test rig to validate the theoretical analysis. It can be seen from simulations and validation tests that the wheel/rail contact relation and the dynamic performance including the hunting stability and ride comfort for the high-speed vehicle with the modified wheel are improved significantly compared with the original wheel.
{"title":"Hunting stability improvement for high-speed trains through modification of wheel/rail contact relation","authors":"Yaru Liang, Lai Wei, Jing Zeng, Ren Luo, Qunsheng Wang","doi":"10.1177/10775463241256681","DOIUrl":"https://doi.org/10.1177/10775463241256681","url":null,"abstract":"The hunting stability is an important issue for vehicle systems that determines the maximum operating speeds of the high-speed trains. In this paper, the research background for the three abnormal vibration phenomena of the high-speed trains caused by the hunting stability problems, including the “VIP Chair Shaking,” “Bogie Alarm,” and “Carbody Sway” problems, are introduced. Firstly, the reason why the vehicle hunting motion loses its stability is investigated from the viewpoint of wheel/rail contact relation. Then, a modified wheel profile is recommended in order to solve or relieve the stability problem, in which the slope at the flange root for the original wheel profile is decreased and the slope at the wheel tread end is increased. Furthermore, the numerical model for a high-speed passenger car is established to verify the dynamic performance of the modified wheel profile. Finally, the dynamic test for the vehicle equipped with the modified wheels is carried out using full-scale roller test rig to validate the theoretical analysis. It can be seen from simulations and validation tests that the wheel/rail contact relation and the dynamic performance including the hunting stability and ride comfort for the high-speed vehicle with the modified wheel are improved significantly compared with the original wheel.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"4 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141380686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Predicting and mitigating curve squealing has always been difficult. This study employed various modeling methods to unify the existing models and establish three finite element models (FEMs) of wheelset–track systems to predict curve squealing. The FEMs of the wheelset–track systems, which incorporated solid fasteners, negative friction–velocity slopes, and multiple wheelsets, were examined using complex eigenvalue analysis to determine their relative capacity to predict curve squeal. The inhibitory effects of damping treatments on curve squeal in both wheels and rails were also studied. The results indicate that, in an improvement on the initial model, the FEMs developed in this study can effectively predict curve squeal with frequencies of 482, 1,205, and 2154 Hz. The wheelset–track system was more likely to produce frictional self-excited vibrations under negative damping and interference from multiple wheelsets, but the impact was small. In addition, the rubber block angle of the resilient wheel was set at 15°. Increasing the damping of the rail vibration absorbers and selecting a continuous–discrete under-rail vibration absorber effectively suppressed the generation of curve squeal.
{"title":"Comparison of modeling methods and mitigation measures for curve squealing","authors":"Xiaohang Feng, Guangxiong Chen, Q. Song, Bingjie Dong, Wenjuan Ren","doi":"10.1177/10775463241258819","DOIUrl":"https://doi.org/10.1177/10775463241258819","url":null,"abstract":"Predicting and mitigating curve squealing has always been difficult. This study employed various modeling methods to unify the existing models and establish three finite element models (FEMs) of wheelset–track systems to predict curve squealing. The FEMs of the wheelset–track systems, which incorporated solid fasteners, negative friction–velocity slopes, and multiple wheelsets, were examined using complex eigenvalue analysis to determine their relative capacity to predict curve squeal. The inhibitory effects of damping treatments on curve squeal in both wheels and rails were also studied. The results indicate that, in an improvement on the initial model, the FEMs developed in this study can effectively predict curve squeal with frequencies of 482, 1,205, and 2154 Hz. The wheelset–track system was more likely to produce frictional self-excited vibrations under negative damping and interference from multiple wheelsets, but the impact was small. In addition, the rubber block angle of the resilient wheel was set at 15°. Increasing the damping of the rail vibration absorbers and selecting a continuous–discrete under-rail vibration absorber effectively suppressed the generation of curve squeal.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141385506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-04DOI: 10.1177/10775463241256449
Hossein Saeedi Masine, Ali Soleimani, Seyed Ehsan Masalegoo
In this article, the dynamics of pipes containing fluid is investigated according to Timoshenko’s beam theory. The problem’s equations were extracted with the help of Hamilton’s principle, and then their responses were obtained using Galerkin’s numerical approach. The modeling of the vertical pipe containing fluid was done using Timoshenko’s beam theory. It is prominent to mention that the considered vertical pipe containing fluid has variable length. The results of this analysis will be compared with previous researches, which were according to Euler–Bernoulli theory. Also, the gravity effect on the pipe stability will be analyzed. Finally, by examining the impact of rotational inertia and shear deformation separately, it was determined that the effect of shear deformation on the pipes’ dynamic behavior containing fluid will be more than the effect of rotational inertia.
{"title":"Dynamic analysis and stability of variable length vertical pipe containing fluid using Timoshenko’s beam theory","authors":"Hossein Saeedi Masine, Ali Soleimani, Seyed Ehsan Masalegoo","doi":"10.1177/10775463241256449","DOIUrl":"https://doi.org/10.1177/10775463241256449","url":null,"abstract":"In this article, the dynamics of pipes containing fluid is investigated according to Timoshenko’s beam theory. The problem’s equations were extracted with the help of Hamilton’s principle, and then their responses were obtained using Galerkin’s numerical approach. The modeling of the vertical pipe containing fluid was done using Timoshenko’s beam theory. It is prominent to mention that the considered vertical pipe containing fluid has variable length. The results of this analysis will be compared with previous researches, which were according to Euler–Bernoulli theory. Also, the gravity effect on the pipe stability will be analyzed. Finally, by examining the impact of rotational inertia and shear deformation separately, it was determined that the effect of shear deformation on the pipes’ dynamic behavior containing fluid will be more than the effect of rotational inertia.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"3 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141268017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, the nonlinear governing equations of motion for an axially moving cylindrical shell with free ends which modeled as a free-free beam are established by the generalized Hamilton’s principle for the first time. The Galerkin method and multiple-scale method are adopted to solve the governing equations. Stability of the motion determined by the velocity and axial stiffness is investigated according to the linear equation firstly. Next, multiple-scale approach method is used to investigate the frequency response by adjusting the detuning parameters of the first two natural frequencies considering the internal resonance. Stability of periodic motion is studied through the trajectories of eigenvalues and phase of trajectories with adjusting the detuning parameter. Influences of its velocity and flexible force of the moving beam on the periodic motion and its stability are addressed through bifurcation diagrams and Lyapunov exponents. Correctness of the presented method for investigating dynamic behavior of the moving beam has been validated through Runge–Kutta numerical calculation. The goal of the research lies in the application of the method in the free-free moving beam and revealing the nonlinear dynamic behavior of the beam.
{"title":"Forced vibration of an axially moving free-free beam with internal resonance","authors":"Yanhong Wu, Guangcai Han, Gangling Hou, Zhihua Yue","doi":"10.1177/10775463241251539","DOIUrl":"https://doi.org/10.1177/10775463241251539","url":null,"abstract":"In this paper, the nonlinear governing equations of motion for an axially moving cylindrical shell with free ends which modeled as a free-free beam are established by the generalized Hamilton’s principle for the first time. The Galerkin method and multiple-scale method are adopted to solve the governing equations. Stability of the motion determined by the velocity and axial stiffness is investigated according to the linear equation firstly. Next, multiple-scale approach method is used to investigate the frequency response by adjusting the detuning parameters of the first two natural frequencies considering the internal resonance. Stability of periodic motion is studied through the trajectories of eigenvalues and phase of trajectories with adjusting the detuning parameter. Influences of its velocity and flexible force of the moving beam on the periodic motion and its stability are addressed through bifurcation diagrams and Lyapunov exponents. Correctness of the presented method for investigating dynamic behavior of the moving beam has been validated through Runge–Kutta numerical calculation. The goal of the research lies in the application of the method in the free-free moving beam and revealing the nonlinear dynamic behavior of the beam.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"40 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141268682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-30DOI: 10.1177/10775463231223550
Gang Xiao, Jiawen Li, Qinwen Yang, Longjie Fan, Qin Liao, Jin Huang
For the formation on unstructured road with complex road conditions, the rationality of constraint design and uncertainty compensation seriously affect the connected and autonomous vehicle (CAV) system performance. The system constraints are studied for safe and efficient formation driving, and an adaptive robust formation control scheme is proposed. First, for the desired configuration and global collision avoidance, a series of equality and unilateral inequality constraints are designed for inter-vehicle spacing. Second, a constraint handling scheme is proposed based on the diffeomorphism method, adjustable transformation function, and bounded constraint. Third, (possibly fast) time-varying but bounded multi-source uncertainty is considered, and then a self-adjusting leakage-type adaptive law is proposed to estimate the integrated uncertainty bound online. Fourth, the performance measure β is defined to evaluate the constraint-following error, and an adaptive robust control is proposed. The effectiveness of the proposed control scheme is verified by simulation. The results show that the proposed control renders the error to be uniformly bounded and uniformly ultimately bounded. The CAV system approximately follows the constraints, regardless of the uncertainty.
{"title":"Constraint-following adaptive robust control for multi-vehicle system formation with collision avoidance","authors":"Gang Xiao, Jiawen Li, Qinwen Yang, Longjie Fan, Qin Liao, Jin Huang","doi":"10.1177/10775463231223550","DOIUrl":"https://doi.org/10.1177/10775463231223550","url":null,"abstract":"For the formation on unstructured road with complex road conditions, the rationality of constraint design and uncertainty compensation seriously affect the connected and autonomous vehicle (CAV) system performance. The system constraints are studied for safe and efficient formation driving, and an adaptive robust formation control scheme is proposed. First, for the desired configuration and global collision avoidance, a series of equality and unilateral inequality constraints are designed for inter-vehicle spacing. Second, a constraint handling scheme is proposed based on the diffeomorphism method, adjustable transformation function, and bounded constraint. Third, (possibly fast) time-varying but bounded multi-source uncertainty is considered, and then a self-adjusting leakage-type adaptive law is proposed to estimate the integrated uncertainty bound online. Fourth, the performance measure β is defined to evaluate the constraint-following error, and an adaptive robust control is proposed. The effectiveness of the proposed control scheme is verified by simulation. The results show that the proposed control renders the error to be uniformly bounded and uniformly ultimately bounded. The CAV system approximately follows the constraints, regardless of the uncertainty.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"5 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140362412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-30DOI: 10.1177/10775463241241838
Jens D Richardt, B. Lossouarn, Jan Høgsberg, J. Deü
Piezoelectric shunt damping can be used for efficient vibration mitigation of a single or multiple vibration modes of a structure. Several analytical tuning expressions have been derived for numerous circuit topologies for a single shunt. However, when multiple shunted piezoelectric transducers are attached to a flexible structure, their individual interactions alongside the spill-over from residual modes affect the calibration accuracy. In this paper, explicit correction terms that represent these effects are presented for multiple shunted piezoelectric transducers targeting a single vibration mode. The correction terms are obtained from the evaluation of effective electromechanical coupling factors, while proper balancing between shunts follows from an assumed proportionality between shunt forces. The proposed correction method is applicable to general shunt architectures, for which tuning is available when targeting a single-degree-of-freedom structure. Its ability to regain nearby optimal damping properties is illustrated numerically for the classic series RL shunt.
{"title":"Calibration of multiple shunted piezoelectric transducers with correction for residual modes and shunt interactions","authors":"Jens D Richardt, B. Lossouarn, Jan Høgsberg, J. Deü","doi":"10.1177/10775463241241838","DOIUrl":"https://doi.org/10.1177/10775463241241838","url":null,"abstract":"Piezoelectric shunt damping can be used for efficient vibration mitigation of a single or multiple vibration modes of a structure. Several analytical tuning expressions have been derived for numerous circuit topologies for a single shunt. However, when multiple shunted piezoelectric transducers are attached to a flexible structure, their individual interactions alongside the spill-over from residual modes affect the calibration accuracy. In this paper, explicit correction terms that represent these effects are presented for multiple shunted piezoelectric transducers targeting a single vibration mode. The correction terms are obtained from the evaluation of effective electromechanical coupling factors, while proper balancing between shunts follows from an assumed proportionality between shunt forces. The proposed correction method is applicable to general shunt architectures, for which tuning is available when targeting a single-degree-of-freedom structure. Its ability to regain nearby optimal damping properties is illustrated numerically for the classic series RL shunt.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"12 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140364601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-12DOI: 10.1177/10775463241232178
Arezoo Ghasempour, Y. Ordokhani, Sedigheh Sabermahani
Herein, we design a new scheme for finding approximate solutions to fractional optimal control problems (OCPs) with and without delay. In this strategy, we introduce Mittag-Leffler wavelet functions and develop a new Riemann–Liouville fractional integral operator for these functions utilizing the hypergeometric function. The properties of the operational matrix have reflected well in the process of the numerical method and affect the accuracy of the proposed method directly. Employing the Riemann–Liouville fractional integral operator, delay operational matrix, and Galerkin method, the considered problems lead to systems of algebraic equations. An error analysis is proposed. Finally, some illustrative numerical tests are given to show the precision and validity of the suggested technique. The proposed method is very efficient for solving the OCPs with delay and without delay, and gives very accurate results.
{"title":"Mittag-Leffler wavelets and their applications for solving fractional optimal control problems","authors":"Arezoo Ghasempour, Y. Ordokhani, Sedigheh Sabermahani","doi":"10.1177/10775463241232178","DOIUrl":"https://doi.org/10.1177/10775463241232178","url":null,"abstract":"Herein, we design a new scheme for finding approximate solutions to fractional optimal control problems (OCPs) with and without delay. In this strategy, we introduce Mittag-Leffler wavelet functions and develop a new Riemann–Liouville fractional integral operator for these functions utilizing the hypergeometric function. The properties of the operational matrix have reflected well in the process of the numerical method and affect the accuracy of the proposed method directly. Employing the Riemann–Liouville fractional integral operator, delay operational matrix, and Galerkin method, the considered problems lead to systems of algebraic equations. An error analysis is proposed. Finally, some illustrative numerical tests are given to show the precision and validity of the suggested technique. The proposed method is very efficient for solving the OCPs with delay and without delay, and gives very accurate results.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"65 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139784705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-12DOI: 10.1177/10775463241232178
Arezoo Ghasempour, Y. Ordokhani, Sedigheh Sabermahani
Herein, we design a new scheme for finding approximate solutions to fractional optimal control problems (OCPs) with and without delay. In this strategy, we introduce Mittag-Leffler wavelet functions and develop a new Riemann–Liouville fractional integral operator for these functions utilizing the hypergeometric function. The properties of the operational matrix have reflected well in the process of the numerical method and affect the accuracy of the proposed method directly. Employing the Riemann–Liouville fractional integral operator, delay operational matrix, and Galerkin method, the considered problems lead to systems of algebraic equations. An error analysis is proposed. Finally, some illustrative numerical tests are given to show the precision and validity of the suggested technique. The proposed method is very efficient for solving the OCPs with delay and without delay, and gives very accurate results.
{"title":"Mittag-Leffler wavelets and their applications for solving fractional optimal control problems","authors":"Arezoo Ghasempour, Y. Ordokhani, Sedigheh Sabermahani","doi":"10.1177/10775463241232178","DOIUrl":"https://doi.org/10.1177/10775463241232178","url":null,"abstract":"Herein, we design a new scheme for finding approximate solutions to fractional optimal control problems (OCPs) with and without delay. In this strategy, we introduce Mittag-Leffler wavelet functions and develop a new Riemann–Liouville fractional integral operator for these functions utilizing the hypergeometric function. The properties of the operational matrix have reflected well in the process of the numerical method and affect the accuracy of the proposed method directly. Employing the Riemann–Liouville fractional integral operator, delay operational matrix, and Galerkin method, the considered problems lead to systems of algebraic equations. An error analysis is proposed. Finally, some illustrative numerical tests are given to show the precision and validity of the suggested technique. The proposed method is very efficient for solving the OCPs with delay and without delay, and gives very accurate results.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"60 38","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139844553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-10DOI: 10.1177/10775463241231344
Bing Wang, HuiMin Li, Xiong Hu, Wei Wang
Rolling bearing is an important rotating support component in mechanical equipment. It is very prone to wear, defects, and other faults, which directly affect the reliable operation of mechanical equipment. Its running condition monitoring and fault diagnosis have always been a matter of concern to engineers and researchers. A rolling bearing fault diagnosis technique based on multi-domain feature and whale optimization algorithm-support vector machine (MDF-WOA-SVM) is proposed. Firstly, recursive analysis is performed on vibration signal and the recursive features are employed as nonlinear recursive feature vector including recursive rate (RR), deterministic rate (DET), recursive entropy (RE), and diagonal average length (DAL). Then, a comprehensive multi-domain feature vector is constructed by combining three time-domain features including root mean square, variance, and peak to peak. Finally, whale optimization algorithm (WOA) is introduced to optimize the penalty factor C and kernel function parameter g to construct the optimal WOA-SVM model. The rolling bearing datasets of Jiangnan University is employed for instance analysis, and the results show that the 10-CV accuracy of the technique proposed is good with an accuracy of 99%. Compared with recursive features or time-domain features, multi-domain features are more accurate and comprehensive in describing characters of the signal. Some popular supervised learning models are also introduced for comparison including K-nearest neighbor (KNN) and decision tree (DT), and the result shows that the proposed method has a higher accuracy and certain advantages.
滚动轴承是机械设备中重要的旋转支撑部件。它极易出现磨损、缺陷等故障,直接影响机械设备的可靠运行。其运行状态监测和故障诊断一直是工程师和研究人员关注的问题。本文提出了一种基于多域特征和鲸鱼优化算法-支持向量机(MDF-WOA-SVM)的滚动轴承故障诊断技术。首先,对振动信号进行递归分析,采用递归特征作为非线性递归特征向量,包括递归率(RR)、确定率(DET)、递归熵(RE)和对角线平均长度(DAL)。然后,结合三个时域特征(包括均方根、方差和峰峰值),构建综合的多域特征向量。最后,引入鲸鱼优化算法(WOA)来优化惩罚因子 C 和核函数参数 g,从而构建最优的 WOA-SVM 模型。采用江南大学的滚动轴承数据集进行实例分析,结果表明所提技术的 10-CV 精度较好,准确率达 99%。与递归特征或时域特征相比,多域特征在描述信号特征方面更加准确和全面。此外,还引入了一些常用的监督学习模型进行比较,包括 K 近邻(KNN)和决策树(DT),结果表明所提出的方法具有更高的准确率和一定的优势。
{"title":"Rolling bearing fault diagnosis based on multi-domain features and whale optimized support vector machine","authors":"Bing Wang, HuiMin Li, Xiong Hu, Wei Wang","doi":"10.1177/10775463241231344","DOIUrl":"https://doi.org/10.1177/10775463241231344","url":null,"abstract":"Rolling bearing is an important rotating support component in mechanical equipment. It is very prone to wear, defects, and other faults, which directly affect the reliable operation of mechanical equipment. Its running condition monitoring and fault diagnosis have always been a matter of concern to engineers and researchers. A rolling bearing fault diagnosis technique based on multi-domain feature and whale optimization algorithm-support vector machine (MDF-WOA-SVM) is proposed. Firstly, recursive analysis is performed on vibration signal and the recursive features are employed as nonlinear recursive feature vector including recursive rate (RR), deterministic rate (DET), recursive entropy (RE), and diagonal average length (DAL). Then, a comprehensive multi-domain feature vector is constructed by combining three time-domain features including root mean square, variance, and peak to peak. Finally, whale optimization algorithm (WOA) is introduced to optimize the penalty factor C and kernel function parameter g to construct the optimal WOA-SVM model. The rolling bearing datasets of Jiangnan University is employed for instance analysis, and the results show that the 10-CV accuracy of the technique proposed is good with an accuracy of 99%. Compared with recursive features or time-domain features, multi-domain features are more accurate and comprehensive in describing characters of the signal. Some popular supervised learning models are also introduced for comparison including K-nearest neighbor (KNN) and decision tree (DT), and the result shows that the proposed method has a higher accuracy and certain advantages.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"11 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139846348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-10DOI: 10.1177/10775463241232752
Jin Chen, Kuan Lu, Weidong Zhu, Hui Cheng, Kaifu Zhang, Xiaohui Gu, Chao Fu
Aero-engine rotor system contains a variety of connectors such as bolts and bearings. However, the dynamic behaviors of the connection are complex in actual engineering. In this paper, the dynamic behavior of the rotor-bearing system with bolted joints and the influence of the parameters of the joints on it are clarified. The parameters include the bearing clearance and the deflection caused by the uneven bolt preload. A rotor-bearing model with bolted joints is established by using Lagrange equations. The bifurcation diagram is solved to explore the tendency of vibration of the system at different speeds by considering the Hertz contact force. Furthermore, the phase diagram, Poincaré map, time-domain steady-state response curve, and spectrum diagram are used to discuss the dynamic behaviors of the system specifically. The influence of the bearing clearance change and uneven bolt preload on the dynamic behaviors is investigated by using the bifurcation diagram. The result shows that the motion of the system is extremely complex, which includes chaotic motion. The Lyapunov exponent is then calculated to verify whether the system enters chaos. The correctness of the model is verified by comparing the result in this work with those in the literature. The model can clarify the dynamic behaviors of the system well and has high accuracy, which can provide the theoretical guidance for the design of rotor-bearing systems with bolted joints.
{"title":"Study on the influence of joint parameters on nonlinear dynamics of a rotor system","authors":"Jin Chen, Kuan Lu, Weidong Zhu, Hui Cheng, Kaifu Zhang, Xiaohui Gu, Chao Fu","doi":"10.1177/10775463241232752","DOIUrl":"https://doi.org/10.1177/10775463241232752","url":null,"abstract":"Aero-engine rotor system contains a variety of connectors such as bolts and bearings. However, the dynamic behaviors of the connection are complex in actual engineering. In this paper, the dynamic behavior of the rotor-bearing system with bolted joints and the influence of the parameters of the joints on it are clarified. The parameters include the bearing clearance and the deflection caused by the uneven bolt preload. A rotor-bearing model with bolted joints is established by using Lagrange equations. The bifurcation diagram is solved to explore the tendency of vibration of the system at different speeds by considering the Hertz contact force. Furthermore, the phase diagram, Poincaré map, time-domain steady-state response curve, and spectrum diagram are used to discuss the dynamic behaviors of the system specifically. The influence of the bearing clearance change and uneven bolt preload on the dynamic behaviors is investigated by using the bifurcation diagram. The result shows that the motion of the system is extremely complex, which includes chaotic motion. The Lyapunov exponent is then calculated to verify whether the system enters chaos. The correctness of the model is verified by comparing the result in this work with those in the literature. The model can clarify the dynamic behaviors of the system well and has high accuracy, which can provide the theoretical guidance for the design of rotor-bearing systems with bolted joints.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"15 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139845886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}