Article
Mechanics
Guorong Zhang, Guang Xi
Summary: This study investigates the vibration control of a rotor-AMB system with time delay. Nonlinear vibration equation is derived and multiple scales method is applied to obtain approximate solutions. The results show that the vibration amplitude and stable region are periodic with respect to time delay, and the period is equal to the rotating period of the rotor. Eccentricity-response curves are constructed to illustrate the effectiveness of time-varying stiffness control.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Engineering, Mechanical
Xing Xu, Xinwei Jiang, Lei Chen, Feng Wang, Vincent Akolbire Atindana
Summary: This paper proposes a new configuration of semi-active quasi-zero stiffness air suspension (QZSAS) with net-work communication architecture, and a matching dynamic output feedback control (DOFC) strategy considering event-triggered mechanism to improve the multi-objective vibration isolation performance of commercial vehicles and save network resource occupation. The semi-active QZSAS is mainly composed of a positive stiffness air spring, a pair of negative stiffness double-acting cylinders, and two continuous damping controlled (CDC) dampers. Results from co-simulation and hardware-in-the-loop (HiL) tests demonstrate that the presented new semi-active QZSAS structure and the DOFC method considering event-triggered mechanism can significantly improve the multi-objective performance of commercial vehicles under different driving conditions with significantly reducing the network communication burden.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Ming Zhang, Pengfei Ma, Feng Sun, Xingwei Sun, Fangchao Xu, Junjie Jin, Lijin Fang
Summary: This study developed a novel decoupling method for the independent control of the position and stiffness of a variable stiffness joint actuator (VSJA). By using static analysis and the Jacobian matrix, the stiffness and dynamics model of the robot joint actuator were obtained. The hybrid dynamic model allowed for torque compensation of the VSJA to enhance position control, and the compliance control method was verified through simulation and experimental analysis.
Article
Energy & Fuels
Ming Ying, Xinghua Liu, Chongbin Zhang, Xinyang Wang, Yuhang Liu, Yue Zhang, Mohammad Javad Parnian
Summary: In this study, a two-pad gas foil bearing is proposed to reduce costs and improve durability. The findings can be utilized to guide the manufacturing of low-cost and highly durable gas foil bearings.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Acoustics
Nur Afifah Kamaruzaman, William S. P. Robertson, Mergen H. Ghayesh, Benjamin S. Cazzolato, Anthony C. Zander
Summary: This paper compares passive and active stability analyses of a six degree of freedom quasi-zero stiffness magnetic levitation vibration isolation system. The study shows that increasing passive stability has a minimal impact on isolation performance, but control benefits from improved passive stability. The designed control system demonstrates robustness to uncertainties with a large stability margin dominating the closed-loop response.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Computer Science, Information Systems
Wu-Sung Yao, Chun-Yi Lin
Summary: This paper investigates the dynamic stiffness of the quadcopter control system and proposes a repetitive controller to reduce the vibration effect by enhancing the direct dynamic stiffness and quadrature dynamic stiffness. Simulated and experimental results demonstrate that the system with the repetitive controller has larger magnitudes of direct dynamic stiffness and smoother quadrature dynamic stiffness compared to the system without the repetitive controller, while also having lower loss factor.
Article
Computer Science, Information Systems
Syed Muhammad Amrr, Abdulrahman Alturki
Summary: The paper proposes a robust control strategy using adaptive second-order non-singular fast terminal sliding mode control design to improve the rotor dynamic performance of fast rotating machines. The higher-order SMC scheme is employed to address the chattering problem from discontinuous SMC input, while a non-singular fast terminal sliding surface is selected for a faster system response.
Article
Acoustics
Hao Zhang, Shiheng Cao, Pengyu Li, Qingkai Han
Summary: This study investigates the coupled self-excited vibration of the gear system characterized by multipoint meshing and oil film bearing supporting in integrally geared compressors. The dynamic model is used to analyze the influence of bearing dynamic coefficients and load on the vibration of the gear system. The results show that flexible support can restrain nonlinear motion and increasing load improves gear operation stability.
SHOCK AND VIBRATION
(2022)
Article
Engineering, Electrical & Electronic
Xuehua Wang, Yuying He, Donghua Pan, Hao Zhang, Yixiao Ma, Xinbo Ruan
Summary: This article investigates the passivity-based design of LCL-filtered inverter with grid current control and capacitor current active damping. It highlights the susceptibility of the optimal damping gain to the lagging phase of the current regulator and filter parameter fluctuations. Proper phase compensations are proposed to enhance the passivity, with the selection and parameter design guidelines provided. Theoretical analysis is verified through simulation and experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Mechanical
Penghai Zhang, Jun Zha
Summary: The study shows that the speed mainly affects the amplitude of the high-speed error motion of porous journal air bearing, while the frequency information remains unaffected. As the speed increases, the averaging coefficient of the error motion also increases, leading to a decrease in accuracy.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Computer Science, Information Systems
Abdelrahman Morsi, Hossam Seddik Abbas, Sabah Mohamed Ahmed, Abdelfatah Mahmoud Mohamed
Summary: Active magnetic bearing (AMB) system has been widely used in high-speed rotating machines, facing challenges such as instability, nonlinearity, and limited operating range. Therefore, employing model predictive control (MPC) based on linear parameter-varying (LPV) models is essential for optimizing AMB system performance and providing stability guarantees.
Article
Engineering, Mechanical
Hak-Jun Lee, Dahoon Ahn
Summary: This paper presents an air bearing stage that uses flexure for yaw motion compensation. The proposed stage combines a new stage structure and flexure to achieve high structural stiffness and low rotational stiffness. Experiments were conducted to verify the performance of the stage and compensation of yaw motion error.
Article
Acoustics
Qihang Li, Yinglin Ren, Weimin Wang, Can Chen, Yuhang Ma
Summary: This study focuses on investigating factors affecting the accuracy of stability parameter identification, including bias currents in actuator coils, excitation and measurement locations, force models of active magnetic bearings (AMBs), excitation magnitudes, and shaft center offsets at actuator nodes. Experimental results show that choosing a small bias current can eliminate the tedious calibration of AMB force, allowing for easier modal parameter analysis.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Transportation Science & Technology
Parthib Khound, Peter Will, Antoine Tordeux, Frank Gronwald
Summary: This paper presents a unified strategy to design ACC systems compensating lower-level time-lag, sensor time-delay, and input disturbance, by achieving over-damped string stability for homogeneous platoons.
TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES
(2023)
Article
Engineering, Aerospace
Xiaofeng Liu, Chenshuang Luo, Enshu Song
Summary: This work investigates a model-based framework for gas turbine engine fuel control system and proposes a dynamic antiwindup compensator to improve control performance. Compared to traditional static compensators, the proposed dynamic compensator achieves better performance in set-point control.
JOURNAL OF AEROSPACE ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Junichi Kouguchi, Hayato Yoshioka
Summary: A new monitoring method for milling process using signal analysis of acceleration sensors is proposed in this research, which can solve the difficulty in estimating cutting forces for small diameter tools.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Weijie Wang, Yanling Tian, Zhao Zhang, Zhilai Lu, Fujun Wang, Dawei Zhang
Summary: This paper proposes a comprehensive model for predicting the cutting depth and contact area in nanoscratching. The model takes into account the geometric shape of the indenter and elastic recovery, reducing prediction errors. The study also analyzes the influence of the indenter geometry on the contact area, with the face angle of the pyramid identified as a key factor.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Qiaolin Li, Yuki Shimizu, Xiaohao Wang, Xinghui Li, Wei Gao
Summary: This paper introduces a stitching linear scan method for roundness and diameter measurement of small cylinders, using a ruby ball stylus as hardware filtering to eliminate the influence of high-frequency data. Experimental results show that the repeatability of the ruby ball stylus is better than the diamond stylus.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Chaturaporn Kerdkaew, Surasak Kaewpho, Sakchai Chomkokard, Theera Yaemglin, Ittipon Cheowanish, Noparit Jinuntuya, Wiwat Wongkokua
Summary: A new calibration standard for a CMOS-based autocollimator using an optical angle generator with a submillimeter strip reflector (OAG-SSR) is proposed. This method provides angular values along the measuring range of the autocollimator without any mechanical movement, enabling a faster calibration process, which is suitable for integration with production lines.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Haohao Tao, Tongjie Li, Feng Chen, Jinwei Fan, Ri Pan
Summary: In this paper, a novel OTA method is proposed that considers the relationship between tolerance of machine tools' key parts and volumetric error. A volumetric error prediction model is established based on the bridge between geometric error and tolerance. Additionally, a Processing Simplicity Index (PSI) is introduced to replace manufacturing cost and a tolerance-PSI model is established. An OTA model is formulated to minimize volumetric error and maximize PSI. The feasibility and effectiveness of the method are validated through simulations and experiments.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Xiumin Zhang, Jianhua Liu, Huanxiong Xia, Xiaohui Ao, Jiechen Zhou, Zhihao Fu
Summary: A comprehensive finite-element model was developed in this paper to study the evolution of surface figure in high-precision bonded mirrors. The cure kinetics and mechanical behaviors of the optical adhesive were experimentally examined and modeled, and the effects of environmental factors on the surface-figure accuracy and stability were further investigated.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Peng Wang, Bin Chen, Jian Li, Jianwei Wang, Yingjie Zhang, Kai Feng
Summary: This paper proposes an aerostatic bearing with damper modules to suppress vibration on the bearing surface. The stiffness and damping characteristics can be adjusted by changing the thickness of the sheets, resulting in effective vibration suppression.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Lei Yang, Xiaoguang Guo, Renke Kang, Xianglong Zhu, Yufan Jia, Hao Wang
Summary: This paper develops an analytical model that takes into account the pad surface morphology to predict the evolution of the workpiece surface shape. The model considers the cross-scale relationship between the formation of lapped surface shape and the scratching process of a single abrasive grain. The simulated and experimental results validate the correctness and validity of the model, providing new ideas for controlling the workpiece surface.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Gabriele Piscopo, Alessandro Salmi, Eleonora Atzeni
Summary: This paper proposes an artifact for the LP-DED process and evaluates its dimensional accuracy and geometrical tolerances. The findings show that the tolerances of the LP-DED process are comparable to sand casting, lower than LB-PBF technologies, but similar to EB-PBF technologies.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Liang Xue, Ningsong Qu
Summary: This study focuses on the key issues of improving material removal rate and surface quality in macro-electrolyte jet machining. By introducing a novel tool with the rear-end tilted, the current density of the workpiece surface can be increased, leading to improved machining performance. Experimental results show that the tool with a rear-end tilt angle of 15 degrees significantly enhances the material removal rate and reduces surface roughness compared to the standard tool.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Ping Yang, Kaixin Luo, Runxi Wu
Summary: This article proposes a new calibration device to measure the spatial errors of a six-axis serial robot. The device compensates for errors by modifying angles and identifying stiffness parameters, and experiments verify its effectiveness.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Shilei Wu, Mingxiang Ling, Yingbin Wang, Tao Huang
Summary: This paper studies the electromechanical behavior of elliptical APAs by analyzing the multi-domain dynamics of piezoelectric stacks and compliant mechanisms using a novel electro-mechanical transfer matrix method. An analytical electro-elasto transfer matrix of piezoelectric stacks operating at the d33 mode is derived in the form of Taylor's series. The dynamic response spectrum of displacement and impedance for elliptical APAs is accurately captured by this electro-mechanical model, and different topologies of elliptical APAs are compared to suggest the optimal configuration.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Lei Meng, Yusheng Liu, Ying Yan, Dongming Guo, Ping Zhou
Summary: This study explores electrochemically induced chemical etching (ECICE) as a method to achieve nanogram-level, low-cost, stress-free, and stable material removal of fused quartz. The key factors affecting removal minimum and stability are revealed through modeling analysis and testing. A proposed method achieves precision stable removal with satisfactory results at the nanogram level.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Hong Yao, Hai Bi, Junjie Wei, Shuo Zhan, Fangxin Chen, IEEE
Summary: This paper presents a dual-loop control syringe-based picoliter-scale injection system for high-precision microinjection. The system utilizes an inner pneumatic servo loop and an outer position servo loop to achieve precise control. The experimental results demonstrate that the system can regulate the smallest droplet size to within 0.25 pL.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Jinchun Yuan, Jiasheng Li, Ye Ding
Summary: In this paper, a simple and effective internal model control (IMC) system is proposed to attenuate thrust ripples in ultraprecision air-bearing linear feed systems, based on a modified modeling and identification method of permanent magnet linear synchronous motors (PMLSMs). The performance of the proposed method in overcoming nonlinearity and achieving smooth velocities in steady states is demonstrated through analysis and experiments.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)