Journal of Mechanical Engineering, Automation and Control Systems最新文献

A rolling bearing fault diagnosis method based on Compressive sensing and Local characteristic-scale decomposition 基于压缩传感和局部特征尺度分解的滚动轴承故障诊断方法

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2024-08-09 DOI: 10.21595/jmeacs.2024.24128

Myong-Jin Jo, Su-Jong Kim, Tong-Chol Choe

{"title":"A rolling bearing fault diagnosis method based on Compressive sensing and Local characteristic-scale decomposition","authors":"Myong-Jin Jo, Su-Jong Kim, Tong-Chol Choe","doi":"10.21595/jmeacs.2024.24128","DOIUrl":"https://doi.org/10.21595/jmeacs.2024.24128","url":null,"abstract":"Rolling bearings are an important part of the system with rotating parts. In the past, the rolling bearing fault diagnosis was based on the envelope of the bearing vibration waveform and FFT analysis to identify the fault and classify the fault type by the feature frequency. In addition, they proposed a method to perform signal processing by decomposing the envelope EMD to improve the diagnostic accuracy. However, this method is computationally intensive due to the iterative computation based on the reduced averaging method, and the convergence rate is different depending on the signal characteristics, which makes it difficult to perform real-time functions and consume a lot of memory space for data communication. In this paper, a method for diagnosing faults in rolling bearings based on compressive sensing (CS) and local characteristic-scale decomposition (LCD) is proposed and the effectiveness of bearing fault diagnosis method is verified by numerical experiments. In this paper, we propose a method to improve the diagnostic accuracy and shorten the computational time by identifying characteristic frequencies of the bearing fault from the Hilbert envelope spectrum of the components decomposed by the LCD after preprocessing and signal filtering of vibration signals based on CS.","PeriodicalId":162270,"journal":{"name":"Journal of Mechanical Engineering, Automation and Control Systems","volume":"52 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141923630","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}

引用次数: 0

Influence of sliding wear on contact characteristics based on 3-D wheel/rail contact model 基于三维车轮/轨道接触模型的滑动磨损对接触特性的影响

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2024-02-23 DOI: 10.21595/jmeacs.2024.23813

Jihao Han, Yunpeng Wei, Tao Yang

{"title":"Influence of sliding wear on contact characteristics based on 3-D wheel/rail contact model","authors":"Jihao Han, Yunpeng Wei, Tao Yang","doi":"10.21595/jmeacs.2024.23813","DOIUrl":"https://doi.org/10.21595/jmeacs.2024.23813","url":null,"abstract":"During the process of starting, braking and running of the train, sliding contact between wheel and rail occurs. The wear caused by sliding contact exerts a noteworthy influence on the contact characteristics of wheel/rail. To analyze these characteristics, a three-dimensional wheel/rail contact wear model is established, and the contact characteristics at different wear depths are studied. The results indicate that at initial contact, the wheel/rail contact patch is approximately elliptical in shape and its area is 122.5 mm2. The von Mises stress of the wheel and rail is maximum in the subsurface at a distance of 2 mm from the contact interface, with maximum values of 559 MPa and 628 MPa respectively. When the wear depth is less than 0.5 mm, the wear depth, contact area and size increase quickly. As the amount of wheel contact wear increases, the maximum contact stress gradually decreases and the contact stress becomes uniform. In addition, the calculation results indicate that the contact patch shape does not always remain elliptical, the shape can change from elliptical to rectangular as the wear depth increases. As the increasing of wear amount, the contact stress gradient on the inner side of wheel contact surface increases.","PeriodicalId":162270,"journal":{"name":"Journal of Mechanical Engineering, Automation and Control Systems","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139957393","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}

引用次数: 0

Galerkin-Kantorovich variational method for solving saint venant torsion problems of rectangular bars 伽勒金-康托洛维奇变分法求解矩形棒材的圣文氏体扭转问题

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2024-02-22 DOI: 10.21595/jmeacs.2024.23928

Charles Chinwuba Ike

{"title":"Galerkin-Kantorovich variational method for solving saint venant torsion problems of rectangular bars","authors":"Charles Chinwuba Ike","doi":"10.21595/jmeacs.2024.23928","DOIUrl":"https://doi.org/10.21595/jmeacs.2024.23928","url":null,"abstract":"The unrestrained torsional analysis of bars is an important theme in elasticity theory, first solved by Saint-Venant using semi-inverse methods. It has been considered and solved by several others using analytical methods and numerical procedures due to the importance in the design of machine parts under torsional moments. In this paper, the Saint Venant torsion problem is solved for rectangular prismatic bars using Galerkin-Kantorovich variational method (GKVM). The work presents a detailed theoretical framework of the problem, deriving using first principles considerations the stress compatibility equation in terms of the Prandtl stress function ϕ(x,y). The derived domain equation which is required to be satisfied over the rectangular cross-sectional domain is a partial differential equation of the Poisson type. GKVM is adopted as the solution method for finding the solution to the domain equation. The unknown Prandtl stress function ϕ(x,y) is assumed, following Kantorovich method to be a product of an unknown function for fx sought to minimize the Galerkin-Kantorovich variational functional (integral) (GKVF) and a known function (y2-b2) which satisfies the boundary conditions at all boundary points in the y-direction, that is, at y=±b. The resulting GKVF is a simplified functional whose integral is a second order inhomogeneous ordinary differential equation (ODE) in fx. The integrand is solved to find fx leading in a full determination of the Prandtl stress function. The expression for stresses, torsional moments and torsional parameters are then found and they satisfy the boundary conditions and the domain equation. The results for the torsional moments and torsional parameters are identical to previous results obtained using double finite sine transform method (DFSTM), and analytical methods. The merit of GKVM is that it has led to the exact solution of the unrestrained torsion problems.","PeriodicalId":162270,"journal":{"name":"Journal of Mechanical Engineering, Automation and Control Systems","volume":"16 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140441887","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}

引用次数: 0

Rigid-flexible coupling modeling of the dual-rotor system for aero-engine 航空发动机双旋翼系统刚柔耦合建模

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2023-10-31 DOI: 10.21595/jmeacs.2023.23500

Pingping Ma, Yuehui Dong, Hangqi Zhao, Yang Li, Muge Liu

{"title":"Rigid-flexible coupling modeling of the dual-rotor system for aero-engine","authors":"Pingping Ma, Yuehui Dong, Hangqi Zhao, Yang Li, Muge Liu","doi":"10.21595/jmeacs.2023.23500","DOIUrl":"https://doi.org/10.21595/jmeacs.2023.23500","url":null,"abstract":"The dual-rotor system is the core component of advanced aero-engine. Establishing a reasonable, accurate, and efficient dynamics model is the key to studying the dynamics and vibration of the rotor system for aero-engine. This manuscript takes a representative aircraft engine dual-rotor system as a prototype, considers the rig-id-flexible coupling characteristics of different stiffness elastic supports and rotor structures, and establishes an analytical dynamic model of the dual-rotor system. Based on the established dynamic model, the natural char-acteristics of the dual-rotor system are analyzed. The model was validated using two different research methods: the rigid-flexible coupling multi-body system dynamics simulation platform ADAMS, and finite element analy-sis. The dynamic model of the dual-rotor system established in this paper can meet the requirements of hierar-chical rigid-flexible coupling of system and structure, overall mass distribution, and stiffness distribution. In particular, it can also effectively realize the simulation of multi-facet and multi-phase unbalanced vibration of the rotor system. The research methods of this paper can further enrich the basic theory of dynamics and vibration of the aero-engine rotor system.","PeriodicalId":162270,"journal":{"name":"Journal of Mechanical Engineering, Automation and Control Systems","volume":"79 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135869930","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}

引用次数: 0

Prospects of robotics in food processing: an overview 机器人技术在食品加工中的应用前景综述

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2023-06-21 DOI: 10.21595/jmeacs.2023.23209

Y. B. Wakchaure, B. K. Patle, Sachin Pawar

引用次数: 0

Design and analysis of experimental adaptive feedback system for active noise control (ANC) in a duct 管道主动噪声控制实验自适应反馈系统的设计与分析

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2023-05-05 DOI: 10.21595/jmeacs.2023.23207

M. Anachkova, Damjan Pecioski, Simona Domazetovska, Dejan Shishkovski

{"title":"Design and analysis of experimental adaptive feedback system for active noise control (ANC) in a duct","authors":"M. Anachkova, Damjan Pecioski, Simona Domazetovska, Dejan Shishkovski","doi":"10.21595/jmeacs.2023.23207","DOIUrl":"https://doi.org/10.21595/jmeacs.2023.23207","url":null,"abstract":"The limitations of passive noise control methods impose a need for new technical solutions to solve the problem of reducing low-frequency noise, which is considered to be a dominant component of noise disturbance. In recent years, the subject of intensive research are the active noise control systems, which have aroused considerable interest and represent a promising solution to the problem of low-frequency noise control. This paper proposes a robust methodology for simplified design and analysis of an experimental active noise control system for real-time control of acoustic environment in a duct. The proposed feedback control model is based on using the LMS algorithm, combined with FxLMS algorithm for estimation and neutralization of the secondary path in the electro-acoustic system. The study shows the potential of the FPGA module and the Real-time module of cRIO from National Instruments, combined with the LabView software environment when applied in adaptive system for active noise control. The reliability and validity of the developed active noise control system is tested for a frequency range of 100 to 1000 [Hz], by measuring the amplitude-time domain in [V] and sound level in [dB]. The comparison of the experimental results shows great efficiency of the system at lower frequency range from 200 to 400 [Hz], where a maximum reduction in sound level achieved at a frequency of 200 [Hz] is 14 [dB] or 17 [%]. A significant sound level reduction is also achieved at both 300 [Hz] and 400 [Hz] which is 12 % or 10 [dB] in both cases. Given the analysis of the challenges and opportunities of the developed active noise control system, recommendations for advancements and future work are proposed.","PeriodicalId":162270,"journal":{"name":"Journal of Mechanical Engineering, Automation and Control Systems","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129834009","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}

引用次数: 0

Analysis of forced oscillations of wheelset bouncing from multiplicative perturbation specified by harmonic function 调和函数表示的乘性扰动下轮对弹跳的强迫振荡分析

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2022-12-28 DOI: 10.21595/jmeacs.2022.23117

V. Nikolaev, J. Musayev, A. Zhauyt

引用次数: 0

Nonlinear dynamic analysis and defect detection of gears 齿轮非线性动态分析与缺陷检测

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2022-05-07 DOI: 10.21595/jmeacs.2022.22374

M. Er-raoudi, M. Diany, H. Aissaoui, M. Mabrouki

引用次数: 1

Effect of the geometrical parameters on the vehicle's moving stability 几何参数对车辆运动稳定性的影响

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2022-03-16 DOI: 10.21595/jmeacs.2022.22340

Xiaobin Ye, V. Nguyen, M. Ke

引用次数: 0

Identification of shallow cracks in rotating systems by utilizing convolutional neural networks and persistence spectrum under constant speed condition 基于卷积神经网络和恒速持续谱的旋转系统浅裂纹识别

Journal of Mechanical Engineering, Automation and Control Systems Pub Date : 2021-12-15 DOI: 10.21595/jmeacs.2021.22221

N. Rezazadeh, M. Ashory, Shila Fallahy

{"title":"Identification of shallow cracks in rotating systems by utilizing convolutional neural networks and persistence spectrum under constant speed condition","authors":"N. Rezazadeh, M. Ashory, Shila Fallahy","doi":"10.21595/jmeacs.2021.22221","DOIUrl":"https://doi.org/10.21595/jmeacs.2021.22221","url":null,"abstract":"The positive benefits of early faults detection in rotating systems have led scientists to develop automated methods. Although unbalancing is the most prevalent defect in rotor systems, this fault normally is accompanied by other defects such as crack. In this article, an effective self-acting procedure is addressed in identifying shallow cracks in rotor systems throughout the steady-state operation. To classify rotor systems suffering cracks with three various depths, firstly, healthy and cracked systems are modeled by employing the finite element method (FEM). In the following, systems' vibration signals are calculated in different situations numerically; for pre-processing stage, the persistence spectrum is implemented. Finally, by using a supervised convolutional neural network (CNN), rotor systems are classified by regarding the crack depths. The result of the testing step revealed that this hybrid method has rational capacity in distinguishing shallow cracks in steady-state operation where many other methods are somehow powerless.","PeriodicalId":162270,"journal":{"name":"Journal of Mechanical Engineering, Automation and Control Systems","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133951116","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}

引用次数: 5