Article
Metallurgy & Metallurgical Engineering
Zhi-ying Gao, Bo Tian, Yang Liu, Li-yuan Zhang, Mao-lin Liao
Summary: The study focused on chatter instability in a 5-stand cold tandem rolling mill and successfully suppressed the chatter while improving rolling efficiency through an optimization model, providing valuable insights for intelligent manufacturing of the rolling process.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Automation & Control Systems
Wenying Zeng, Jinkuan Wang, Yan Zhang, Yinghua Han, Qiang Zhao
Summary: This paper presents a model-free controller based on Deep Deterministic Policy Gradient (DDPG) for thickness and tension control in the unsteady rolling process of cold rolling. By utilizing strategies such as dividing state space variables with the mechanism model, defining reward function and state normalization, the DDPG controller copes with random disturbance and complex uncertainties, achieving better accuracy, stability, and rapidity than the proportional integral (PI) controller.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Metallurgy & Metallurgical Engineering
Yan-li Xin, Zhi-ying Gao, Bo Tian, Qing-dong Zhang
Summary: This article introduces the deterioration of equipment and product quality caused by chatter or slip instability in the high-speed cold tandem rolling process of thin plate, and proposes a novel approach to calculate the speed-dependent friction coefficient. The influence of friction coefficient on the instability of slip and chatter is investigated, and technical strategies are proposed to suppress these instabilities in the actual rolling process.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Automation & Control Systems
Maojun Li, Dingxiao Huang, Xujing Yang
Summary: In high-speed robotic milling process, acoustic emission technique combined with root mean square value and fast Fourier transform method were used to analyze chatter phenomenon. A stability lobe diagram was proposed for predicting chatter occurrence, along with the establishment of underlying mechanism and theoretical analysis of chatter stability.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Lei Cao, Xu Li, Qinglong Wang, Dianhua Zhang
Summary: This work discusses the importance of the friction characteristics of rolling interface in rolling stability, introduces a new unsteady lubrication model, develops a dynamic chatter model, analyzes the main process parameters affecting mill stability, and investigates the changes in parameters and tribological characteristics during unstable rolling processes. The conclusion is that the rapid changes in lubrication state and friction stress lead to intensified vibration.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Xing Lu, Jie Sun, Zhen Wei, Guangtao Li, Dianhua Zhang
Summary: This paper introduces a new model to predict the minimum friction coefficient in rolling mills, improving friction balance and designing optimal rolling conditions to expand the stability range of the friction.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Automation & Control Systems
Lei Cao, Xu Li, Dianhua Zhang
Summary: This study proposes a new finite element model to investigate the influence of flatness control actuators on mill stability in the cold rolling process. The results show that work roll bending has the greatest impact on the critical speed, followed by intermediate roll shifting and intermediate roll bending. This research contributes to mechanism improvement and chatter suppression in the cold rolling process.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Industrial
Min Wan, Xue-Bin Dang, Wei-Hong Zhang, Yun Yang
Summary: This article presents a new method to suppress chatter vibrations in the milling process of weakly-rigid workpieces by designing a moving fixture that provides additional stiffness and damping. The method combines structure split-assembly technology and fractal contact theory to mathematically model the dynamic behavior of the workpiece, and the effectiveness of the method is verified through actual milling tests.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Asier Astarloa, Alptunc Comak, Iker Mancisidor, Maria Helena Fernandes, Jokin Munoa, Zoltan Dombovari
Summary: This study proposes using mode coupling effect to increase damping, stabilize the machining process, and optimize tool length and material to improve cutting stability in boring operations.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Muhammet Ozsoy, Neil D. Sims, Erdem Ozturk
Summary: This paper investigates the application of actively controlled robot arm in robot-assisted milling method, experimental results confirm that active control can improve chatter stability and critical cutting depth.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Automation & Control Systems
Da-Wei Zhang, Chao Zhang, Chong Tian, Sheng-Dun Zhao
Summary: This paper studies the forming characteristics of the thread cold rolling process with round dies. The results show that metal flow and plastic deformation mainly occur in the superficial area near the thread profile. The radial load is the main load of rolling dies and the characteristics of metal flow, stress distribution, and strain distribution in the thread profile are significantly different.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Tao Liu, Zhaohui Deng, Chengyao Luo, Zhongyang Li, Lishu Lv, Rongjin Zhuo
Summary: The paper proposes a novel approach based on VMD parametric optimization to detect chatter in the high-speed grinding process of camshaft. The method preprocesses the chatter signal using FLMEMD, estimates the number of modes, optimizes the quadratic penalty, and automatically detects chatter frequency bands using energy entropy. The effectiveness of the proposed method is validated through simulations and high-speed grinding experiments, showing its suitability for detecting chatter in the camshaft high-speed grinding process.
Article
Engineering, Multidisciplinary
Gang Jin, Haotian Jiang, Jianxin Han, Zhanjie Li, Hua Li, Bing Yan
Summary: The paper presents a method of suppressing milling chatter by disrupting regenerative effect for higher cutting stability, analyzing the influence of variables such as helix angle, process phase difference, and feed per tooth on milling stability. The study shows significant stability discrepancies due to changes in helix angle, as well as the important influence of process phase difference on stability with a periodic evolution. Recommended values for practical milling process are provided.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2021)
Article
Automation & Control Systems
Alper Dumanli, Burak Sencer
Summary: The article proposes a novel control system design for machine tool feed drives, modulating cutting tool motion based on in-process vibration measurements to mitigate chatter vibrations. The method stabilizes machining process dynamics by controlling delay differential equations and robustly suppresses regenerative chatter vibrations in the orthogonal turning process.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Automation & Control Systems
Alper Dumanli, Burak Sencer
Summary: This article introduces a novel control system design for machine tool feed drives to mitigate chatter vibrations in subtractive manufacturing processes. By utilizing an H-infinity control framework, the proposed controller stabilizes machining dynamics and ensures robust process stability. Experimental validations show that regenerative chatter vibrations in orthogonal turning processes can be effectively suppressed, leading to up to a five-fold increase in MRR.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Engineering, Mechanical
Xuanen Kan, Yanjun Lu, Fan Zhang, Weipeng Hu
Summary: A blade disk system is crucial for the energy conversion efficiency of turbomachinery, but differences between blades can result in localized vibration. This study develops an approximate symplectic method to simulate vibration localization in a mistuned bladed disk system and reveals the influences of initial positive pressure, contact angle, and surface roughness on the strength of vibration localization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Zimeng Liu, Cheng Chang, Haodong Hu, Hui Ma, Kaigang Yuan, Xin Li, Xiaojian Zhao, Zhike Peng
Summary: Considering the calculation efficiency and accuracy of meshing characteristics of gear pair with tooth root crack fault, a parametric model of cracked spur gear is established by simplifying the crack propagation path. The LTCA method is used to calculate the time-varying meshing stiffness and transmission error, and the results are verified by finite element method. The study also proposes a crack area share index to measure the degree of crack fault and determines the application range of simplified crack propagation path.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Rongjian Sun, Conggan Ma, Nic Zhang, Chuyo Kaku, Yu Zhang, Qirui Hou
Summary: This paper proposes a novel forward calculation method (FCM) for calculating anisotropic material parameters (AMPs) of the motor stator assembly, considering structural discontinuities and composite material properties. The method is based on multi-scale theory and decouples the multi-scale equations to describe the equivalence and equivalence preconditions of AMPs of two scale models. The effectiveness of this method is verified by modal experiments.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Hao Zhang, Jiangcen Ke
Summary: This research introduces an intelligent scheduling system framework to optimize the ship lock schedule of the Three Gorges Hub. By analyzing navigational rules, operational characteristics, and existing problems, a mixed-integer nonlinear programming model is formulated with multiple objectives and constraints, and a hybrid intelligent algorithm is constructed for optimization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Jingjing He, Xizhong Wu, Xuefei Guan
Summary: A sensitivity and reliability enhanced ultrasonic method has been developed in this study to monitor and predict stress loss in pre-stressed multi-layer structures. The method leverages the potential breathing effect of porous cushion materials in the structures to increase the sensitivity of the signal feature to stress loss. Experimental investigations show that the proposed method offers improved accuracy, reliability, and sensitivity to stress change.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Benyamin Hosseiny, Jalal Amini, Hossein Aghababaei
Summary: This paper presents a method for monitoring sub-second or sub-minute displacements using GBSAR signals, which employs spectral estimation to achieve multi-dimensional target detection. It improves the processing of MIMO radar data and enables high-resolution fast displacement monitoring from GBSAR signals.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xianze Li, Hao Su, Ling Xiang, Qingtao Yao, Aijun Hu
Summary: This paper proposes a novel method for bearing fault identification, which can accurately identify faults with few samples under complex working conditions. The method is based on a Transformer meta-learning model, and the final result is determined by the weighted voting of multiple models.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xiaomeng Li, Yi Wang, Guangyao Zhang, Baoping Tang, Yi Qin
Summary: Inspired by chaos fractal theory and slowly varying damage dynamics theory, this paper proposes a new health monitoring indicator for vibration signals of rotating machinery, which can effectively monitor the mechanical condition under both cyclo-stationary and variable operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Hao Wang, Songye Zhu
Summary: This paper extends the latching mechanism to vibration control to improve energy dissipation efficiency. An innovative semi-active latched mass damper (LMD) is proposed, and different latching control strategies are tested and evaluated. The latching control can optimize the phase lag between control force and structural response, and provide an innovative solution to improve damper effectiveness and develop adaptive semi-active dampers.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Menghao Ping, Xinyu Jia, Costas Papadimitriou, Xu Han, Chao Jiang, Wang-Ji Yan
Summary: Identification of non-Gaussian processes is a challenging task in engineering problems. This article presents an improved orthogonal series expansion method to convert the identification of non-Gaussian processes into a finite number of non-Gaussian coefficients. The uncertainty of these coefficients is quantified using polynomial chaos expansion. The proposed method is applicable to both stationary and nonstationary non-Gaussian processes and has been validated through simulated data and real-world applications.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Lei Li, Wei Yang, Dongfa Li, Jianxin Han, Wenming Zhang
Summary: The frequency locking phenomenon induced by modal coupling can effectively overcome the dependence of peak frequency on driving strength in nonlinear resonant systems and improve the stability of peak frequency. This study proposes the double frequencies locking phenomenon in a three degrees of freedom (3-DOF) magnetic coupled resonant system driven by piezoelectricity. Experimental and theoretical investigations confirm the occurrence of first frequency locking and the subsequent switching to second frequency locking with the increase of driving force. Furthermore, a mass sensing scheme for double analytes is proposed based on the double frequencies locking phenomenon.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Kai Ma, Jingtao Du, Yang Liu, Ximing Chen
Summary: This study explores the feasibility of using nonlinear energy sinks (NES) as replacements for traditional linear tuned mass dampers (TMD) in practical engineering applications, specifically in diesel engine crankshafts. The results show that NES provides better vibration attenuation for the crankshaft compared to TMD under different operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Wentao Xu, Li Cheng, Shuaihao Lei, Lei Yu, Weixuan Jiao
Summary: In this study, a high-precision hydraulic mechanical stand and a vertical mixed-flow pumping station device were used to conduct research on cavitation signals of mixed-flow pumps. By analyzing the water pressure pulsation signal, it was found that the power spectrum density method is more sensitive and capable of extracting characteristics compared to traditional time-frequency domain analysis. This has significant implications for the identification and prevention of cavitation in mixed-flow pump machinery.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xiaodong Chen, Kang Tai, Huifeng Tan, Zhimin Xie
Summary: This paper addresses the issue of parasitic motion in microgripper jaws and its impact on clamping accuracy, and proposes a symmetrically stressed parallelogram mechanism as a solution. Through mechanical modeling and experimental validation, the effectiveness of this method is demonstrated.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Zhifeng Shi, Gang Zhang, Jing Liu, Xinbin Li, Yajun Xu, Changfeng Yan
Summary: This study provides useful guidance for early bearing fault detection and diagnosis by investigating the effects of crack inclination and propagation direction on the vibration characteristics of bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)