Article
Chemistry, Physical
Jingjing Xia, Jun Yu, Siwen Lu, Qiushi Huang, Chun Xie, Zhanshan Wang
Summary: In this study, the nature of chemical and mechanical material removal during CMP is theoretically investigated and a microscale material removal model is established to predict the silicon surface morphology and explain the evolution of surface roughness and the source of polishing scratches.
Article
Engineering, Manufacturing
Yongchao Xu, Guangen Zhao, Qianting Wang, Youji Zhan, Bingsan Chen
Summary: In this study, CeO2 coated diamond composite abrasives were successfully synthesized by a modified precipitation approach, which eliminated the use of hazardous chemicals in the polishing of sapphire wafers. The composite abrasives exhibited improved polishing performance, with reduced surface roughness, increased material removal rate, and decreased residual stress. The analysis of polished sapphire surface and wear debris provided insights into the polishing mechanism and interfacial contact behavior of the composite abrasives.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Mechanical
Weifeng Yao, Qingqing Chu, Binghai Lyu, Chengwu Wang, Qi Shao, Ming Feng, Zhe Wu
Summary: This paper investigates the material removal and surface roughness in cylindrical polishing using a soft pad and free abrasives. The study proposes models for material removal and surface roughness, taking into account the contact deformation at different scales. Experimental and simulation results verify the accuracy of the models. The influence of loading force, abrasives concentration, and grain size on material removal and surface roughness is analyzed, along with parameters related to contact under different conditions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Manufacturing
Cheng Fan, Xingfeng Wang, Kaixuan Liu, Yigang Chen, Fusheng Liang, Zhao Wang, Jun Zhao
Summary: This paper presents a new manufacturing method of low-temperature-assisted electrorheological polishing to improve the surface quality of foldable acrylate intraocular lenses (IOLs). The effects of temperature on the mechanical properties and material removal mechanism of IOLs were studied systematically. A new low temperature-assisted electrorheological polishing system was designed, and the results showed that low-temperature-assisted electrorheological polishing is an effective method for fabricating foldable acrylate IOLs with high efficiency and quality.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Chemistry, Physical
Qiufa Luo, Jing Lu, Zige Tian, Feng Jiang
Summary: In this study, the interaction between diamond abrasives and the 6H-SiC wafer surface during ultra-precision polishing was analyzed through experiments and molecular dynamics simulations. It was found that controlling material removal uniformity and restricting abrasive cutting depth to tens of nanometers or less can achieve a smooth, scratch-free and almost damage-free wafer surface. These findings provide insights into the importance of controlling material removal uniformity in nanoscale manufacturing processes.
APPLIED SURFACE SCIENCE
(2021)
Article
Automation & Control Systems
Xingtian Qu, Qinglong Liu, Hongyi Wang, Haizhong Liu, Jiming Liu, Huichao Sun
Summary: This paper combines polishing path planning and material removal optimization to ensure material removal uniformity and polishing efficiency. Two common polishing paths, the scanning path and the concentric circle path, are analyzed and optimized. Simulations and experiments confirm that the proposed method effectively improves material removal uniformity, controls material removal thickness, and ensures polishing efficiency.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Huiting Shi, Shengqiang Yang, Xiuhong Li, Wenhui Li, Huixin Zhang
Summary: The research shows that hydrogen peroxide and triethanolamine oleate can enhance the wettability of grinding fluid, with A3 grinding fluid having the best surface roughness and brightness. Barrel finishing achieves low-stress plastic deformation, restricting the formation of subsurface damage.
MATERIALS AND MANUFACTURING PROCESSES
(2021)
Article
Engineering, Mechanical
Manjesh Kumar, Chandan Kumar, Hari Narayan Singh Yadav, Manas Das, Nan Yu
Summary: This study successfully achieved nano-finishing of intricate surfaces of tiny gear components through the magnetorheological (MR) polishing process, resulting in a significant improvement in surface roughness. The synthesis of magnetorheological polishing fluid (MRPF) and its impact on workpiece surfaces were investigated, a mathematical model for material removal was developed, and various analytical tools were used to examine the finishing surface characteristics of gear profiles.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Wan Wang, Dongpeng Hua, Qing Zhou, Shuo Li, Stefan J. Eder, Junqin Shi, Zhijun Wang, Haifeng Wang, Weimin Liu
Summary: This work uses molecular dynamics simulation to reveal the chemical mechanical polishing (CMP) mechanism of the Invar alloy in water-lubricated environments. The results show that the appropriate thickness of the water film and polishing speed can reduce surface roughness and eliminate subsurface defects. Increasing rolling speed leads to a decrease in surface roughness and subsurface damage thickness, while increasing water film thickness results in more subsurface defects despite reducing surface roughness through an increase in passivated atoms. These findings contribute to understanding the CMP mechanism in water-lubricated conditions and promoting the development of surface engineering for micro/nano components.
APPLIED SURFACE SCIENCE
(2023)
Article
Automation & Control Systems
Jianwei Ji, Muhammad Ajmal Khan, Zejin Zhan, Rong Yi, Hui Deng
Summary: In this paper, the universal factor determining the evolution of surface roughness during electrochemical polishing (ECP) is studied. The material removal thickness is found to be the key parameter governing the roughness evolution of the polished surface, regardless of other parameters.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Sheng Qu, Tao Yu, Fanwei Meng, Chao Zhang, Xuewei Zhang, Zhelun Ma, Zixuan Wang, Tianbiao Yu, Ji Zhao
Summary: Ultrasonic vibration polishing (UVP), integrating mechanical polishing and ultrasonic vibration technologies, is used for processing monocrystalline silicon. A predictive model for material removal rate (MRR) is developed, considering micro-level contact, scratch effect, and impact removal. UVP experiments validate the model, with MRR being consistent and controlled within 10% error rate. Increasing spindle speed and ultrasonic amplitude enhances kinetic energy, while larger abrasive grain size improves contact area, thus contributing to MRR. Additionally, different polishing parameters are analyzed for surface roughness and morphology.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Tan-Tai Do, Te-Hua Fang
Summary: This study employed molecular dynamics simulations to investigate the substrate removal methods in beta-SiC polishing. The vibration-coupled rolling motion was found to be the most effective, while the sliding motion showed significant improvement in atom removal. Additionally, increasing the number of asperities and the amplitude of vibration led to improved surface roughness.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Yongchun Zou, Shuqi Wang, Guoliang Chen, Yaming Wang, Kaiwei Zhang, Chaoren Zhang, Daqing Wei, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: A plasma electrolytic polishing (PEP) technique was used to obtain high-quality surfaces of a TC4 alloy with high reflectivity. An orthogonal experiment was conducted to investigate the factors influencing the surface quality, and it was found that temperature had the greatest effect on surface roughness. After PEP, the alloy's surface roughness and crest and trough area decreased significantly.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Industrial
Zhong-Chen Cao, Ming Wang, Shengqin Yan, Chenyao Zhao, Haitao Liu
Summary: Fluid jet polishing (FJP) is a widely used technology for ultra-precision polishing of complex optical components. This study investigates the influence of polishing parameters on the damage characteristics and surface quality of optical glass through experiments and numerical simulations. A damage control strategy is proposed based on the understanding of material removal mechanism. The results provide theoretical support for equipment upgrade and process optimization of FJP.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Jiahuan Wang, Zewei Tang, Saurav Goel, Yu Zhou, Yanfei Dai, Jinhu Wang, Qiankun He, Julong Yuan, Binghai Lyu
Summary: This study proposes a novel 'chemistry enhanced shear thickening polishing' (C-STP) process using Fenton's reagent to achieve sub 10 nm finished polishing at a rate twice that of conventional STP for complex-shaped cemented carbide components. The concentration of Fenton's reagent was found to have an influence on the material removal rate but not on the surface roughness. Electrochemical experiments showed that Fenton's reagent could effectively reduce the corrosion resistance of tungsten carbide-cobalt alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Lei Deng, Shuaishuai Sun, Matthew Daniel Christie, Wenxing Li, Donghong Ning, Haiping Du, Shiwu Zhang, Weihua Li
Summary: This paper presents an innovative variable stiffness and variable damping magnetorheological (MR) actuation system to solve the overshoot and long settling time problems in the positioning control of robotic arms. By controlling the stiffness and damping of the VSVD unit, the system can reduce overshoot and settling time of the robotic arm with less energy consumption. Both numerical and experimental results demonstrate that the proposed VSVD actuation system is an effective solution for robotic arm positioning control problems.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Acoustics
Shiwei Liu, Gaoliang Peng, Zhixiong Li, Weihua Li
Summary: This paper focuses on the analytical jump criteria problem for a class of Duffing systems based on the concave-convex property. The defined single critical jump point is proved to be an inflection point, and the analytical jump-avoidance criteria under different excitations are established. The sensitivities of dynamic parameters are discussed, and the effectiveness of the proposed method is demonstrated through numerical simulations and comparisons.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Mechanical
Shiwei Liu, Gaoliang Peng, Zhixiong Li, Weihua Li, Kang Jin, Hongzhao Lin
Summary: Inspired by the nonlinearity of origami cartons, a novel origami-inspired constant-force mechanism (OriCFM) is proposed. It adds equivalent springs at horizontal and oblique creases of the rigid origami mechanism to achieve a stable constant force output. The mechanical model is established based on geometric relationships, and the influence of structural parameters and spring stiffness on the constant force characteristic of the OriCFM is analyzed. Experimental results demonstrate the feasibility and effectiveness of the proposed mechanism.
MECHANISM AND MACHINE THEORY
(2023)
Article
Chemistry, Physical
Yue Chen, Xuanhan Chen, Zhenhong Zhu, Mingyuan Sun, Shen Li, Minfeng Gan, Shi-Yang Tang, Weihua Li, Shiwu Zhang, Lining Sun, Xiangpeng Li
Summary: This study developed foam-core liquid metal (FCLM) droplets that can be manipulated in 3D in an electrolyte. The FCLM droplets are made by coating liquid metal on the surface of a copper-grafted foam sphere and actuated by electrically inducing Marangoni flow. Multiple droplets can form 3D structures, showing potential for wider applications.
Article
Chemistry, Physical
Liping Gong, Tingting Xuan, Sheng Wang, Haiping Du, Weihua Li
Summary: Researchers have developed a versatile liquid metal-based triboelectric nanogenerator (LM-TENG) device, which integrates shear stiffening elastomer (SSE) with liquid metal (LM) and electrothermal aluminum foil. The LM-TENG demonstrated good energy harvesting capacity and excellent electrothermal and anti-impact performance. This study provides a new strategy for designing multifunctional sensors and paves the way for intelligent wearable electronics, personal healthcare, and safeguards.
Article
Engineering, Electrical & Electronic
Shengfeng Zhu, Ning Gong, Jian Yang, Shiwu Zhang, Xinglong Gong, Weihua Li, Shuaishuai Sun
Summary: Magnetorheological (MR) technology is controllable and has provided effective solutions to engineering bottleneck problems. Designing a rotary MR damper with a high torque-volume ratio is challenging, especially for specific applications with limited space. To solve this problem, a rotary damper based on MR bearings was designed and evaluated, which saves space and provides high torque. Quasistatic testing shows that this rotary damper achieves a high torque-volume ratio of 190 kN/m(2), nearly four times higher than existing rotary MR dampers, effectively satisfying high torque requirements in limited space.
Article
Engineering, Electrical & Electronic
Matthew Daniel Christie, Shuaishuai Sun, Lei Deng, Haiping Du, Shiwu Zhang, Weihua Li
Summary: The performance of a magnetorheological-fluid-based variable stiffness actuator leg under high impact forces was evaluated through optimal tuning and control of stiffness and damping properties. Drop testing experiments were conducted to assess the leg's performance at different drop heights and payload masses. The results demonstrated the importance of considering both stiffness and damping in the design of legged robots for high impact force resistance, and highlighted the efficacy of the proposed magnetorheological-fluid-based leg design for this purpose.
Article
Computer Science, Artificial Intelligence
Yan Yan, Haiping Du, Qing-Long Han, Weihua Li
Summary: This study presents a real-time switching topology technique to improve the performance of connected autonomous vehicles under poor communication. A sliding mode controller is designed for a nonlinear heterogeneous vehicle model with packet loss, and Lyapunov analysis is applied to ensure stability. A two-step switching topology framework is introduced to optimize the platoon's performance. Numerical simulations show significant improvements in platoon tracking ability, fuel efficiency, and driving comfort.
IEEE TRANSACTIONS ON INTELLIGENT VEHICLES
(2023)
Article
Chemistry, Multidisciplinary
Qingtian Zhang, Hongda Lu, Guolin Yun, Liping Gong, Zexin Chen, Shida Jin, Haiping Du, Zhen Jiang, Weihua Li
Summary: The researchers have developed a liquid metal-doped polyvinyl alcohol hydrogel that exhibits ultra-high conductivity and excellent mechanical properties. The high conductivity is achieved through the self-sintering behavior of the liquid metal, while the impressive mechanical properties are attributed to the formation of polymer crystalline regions and polymer-tannic acid multiple hydrogen bonds.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Instruments & Instrumentation
Liping Gong, Ning Gong, Bochao Wang, Jian Yang, Haiping Du, Shuaishuai Sun, Shiwu Zhang, Weihua Li
Summary: With the development of transportation industry, advanced rail vehicle technology has received increasing attention. The stiffness of the train's rubber joint plays a crucial role in its stability and curve-passing performance. To solve this problem, a new rubber joint based on magnetorheological shear stiffening elastomer (MSSE) was proposed. The stiffness of this MSSE joint can be adjusted by external magnetic field and its frequency-dependent property, ensuring functionality even when the controller fails. The feasibility of the joint to meet conflicting stiffness requirements for high speed stability and curve trafficability was demonstrated.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Dezheng Hua, Xinhua Liu, Haiping Du, Grzegorz M. Krolczyk, Weihua Li, Zhixiong Li
Summary: This work proposes a positioning method based on a double-layer symmetric sensor array to achieve effective positioning of magnetically controlled capsule robots. A near-field error correction method based on a multimagnetic dipole model is presented to improve the accuracy of the capsule robot magnetic field model. An arrangement of a double-layer symmetric sensor array is designed to reduce the interference of hybrid magnetic fields in a multimagnetic driving environment. The positioning method is validated through in vitro experiments, with an average positioning error of 3.4 mm.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Mechanical
Shiwei Liu, Gaoliang Peng, Zhixiong Li, Weihua Li, Lidong Sun
Summary: This paper presents a new elastic origami-inspired structure with quasi-zero-stiffness (QZS) characteristics for effective low-frequency vibration isolation. The mechanical model of the origami mechanism is established by integrating elastic joints with compression springs. The derived nonlinear stiffness characteristics contribute to a high-performance QZS isolator. The experimental results validate the effectiveness of the theoretical model and the advantages of the origami-inspired vibration isolation system in comparison with typical nonlinear passive isolators.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Automation & Control Systems
Xiangjun Xia, Donghong Ning, Yulin Liao, Pengfei Liu, Haiping Du, Weihua Li, Guijie Liu
Summary: This article proposes a novel multifunction electrically interconnected suspension (MFEIS) system that can reduce vibration and harvest energy at the same time. Two H-bridge circuits are used to control the energy flow. The energy flow and control procedures of each mode are studied, and two multiobjective control strategies are proposed to balance ride comfort and energy recovery performance.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Automation & Control Systems
Wanli Liu, Zhixiong Li, Weihua Li, Paolo Gardoni, Haiping Du, Miguel Angel Sotelo
Summary: This article proposes a new method that integrates the double layer recurrent neural network (DLRNN) and multistate constrained Kalman filter (MSCKF) to online correct the LiDAR-IMU time delay errors. The proposed method significantly improves the efficiency and accuracy of the time delay error correction in a real-time manner. The experimental results demonstrate that the LiDAR-IMU time delay error can be accurately and quickly corrected, improving the positioning and navigation performance of the LiDAR-IMU system.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Automation & Control Systems
Yulin Liao, Donghong Ning, Pengfei Liu, Haiping Du, Weihua Li
Summary: This article proposes an acceleration-measurement-based disturbance compensation control strategy for vehicles with electrically interconnected suspension (EIS). By introducing a disturbance observer, unknown disturbances are estimated using acceleration measurements, and the gains of the observer and H-infinity controller are obtained simultaneously using the linear matrix inequality method to simplify the implementation process. The control strategy utilizes vertical acceleration and angular acceleration to form a closed-loop feedback control, enhancing robustness.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
