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9th International Conference on Dependable Systems and Their Applications, DSA 2022

作者： Jiang, Renyan Zhu, Xiaowei Xue, Wei Wu, Rangda Cao, Yu College of Mechanical and Electrical Engineering Wenzhou University Zhejiang Provincial Key Laboratory of Laser Processing Robotics China China International Science & Technology Cooperation Base for Laser Processing Robotics Wenzhou University China Co. Ltd. Zhejiang Wenzhou325000 China

ISBN: (数字)9781665488778

ISBN: (纸本)9781665488778

Design of experiments has been widely applied to improve product quality and reliability. When the objective is to improve the reliability, the response of experiments is usually a life observation, and experiment is often stopped at a pre-specified time (i.e., type-I censoring) so that the gathered life data are incomplete. In this case, the traditional methods such as the Taguchi and response surface methods cannot be applied, and some assumptions have to be made so that the data can be analyzed using those methods. A typical assumption is that a right-censored time is treated as a failure time. This assumption is obviously unrealistic. To address this issue, this paper proposes a novel method to estimate mean lifetime with censoring of a right-censored time, which is used to replace the censored time. The proposed method first sorts the data in ascending order. Then, a weighted least squares method is used to fit the ordered data to a power-law model of the order number. Finally, the fitted model is used to extrapolate the mean lifetime with censoring. Three examples are included to illustrate the appropriateness and usefulness of the proposed method. © 2022 IEEE.

关键词： Design of experiments

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A Mixed Method for Estimating Parameters of Three-Parameter Weibull Distribution 9

A Mixed Method for Estimating Parameters of Three-Parameter ...

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9th International Symposium on System Security, Safety, and Reliability, ISSSR 2023

作者： Jiang, Renyan Li, Fengping Xue, Wei Li, Xiao Zhang, Kunpeng Institute of Laser and Optoelectronic Intelligent Manufacturing Wenzhou University Wenzhou325035 China Wenzhou University China International Science & Technology Cooperation Base for Laser Processing Robotics Wenzhou325035 China Wenzhou University Provincial Key Laboratory of Laser Processing Robotics College of Mechanical and Electrical Engineering Wenzhou325035 China

ISBN: (纸本)9798350302479

The three-parameter Weibull distribution has been widely used for modeling component lifetime and material strength. The parameter estimates obtained from the maximum likelihood estimation method (MLE) and maximum product of spacing (MPS) method can be biased or inexistent. Though many other approaches have been developed, none is always efficient. Therefore, it is still a challenging issue to develop more efficient estimation methods. This paper aims to address this issue by proposing a mixed approach. The proposed approach is based on a modified Weibull transformations and involves three main steps. The first step determines two reference points from the empirical distribution function. In the second step, the location parameter is estimated based on the ratios of the difference between the reference point and data points on the modified Weibull probability paper (MWPP) plot. The third step estimates the shape and scale parameters based on the linear relation of the MWPP plot. The accuracy and robustness of the proposed approach is illustrated by a numerical experiment and its usefulness is illustrated by a real-world example. The results shows that the proposed approach provides more accurate and robust estimates than the MLE and MPS. © 2023 IEEE.

关键词： Parameter estimation

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Candidate Models for Modeling Quality Characteristics in Process Capability Analysis

Candidate Models for Modeling Quality Characteristics in Pro...

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2024 IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 2024

作者： Jiang, Renyan Xue, Wei Cao, Yu China International Sci. & Tech. Cooperation Base for Laser Processing Robotics Wenzhou University Wenzhou China Oujiang Laboratory Zhejiang Lab for Regenerative Medicine Vision and Brain Health Wenzhou University Wenzhou China Zhejiang Provincial Innovation Center of Laser Intelligent Equipment Technology Wenzhou China

ISBN: (纸本)9798350386097

Capability analysis of manufacturing processes needs to appropriately model quality characteristics (QCs). The sample data for modeling can be divided into three categories: (a) original measurement data of QCs, (b) transformed or normalized measurement data, and (c) data of a composite QC obtained through aggregating several QCs. Generally, different categories of data require different types of distribution models. The purpose of this paper is to identify potential candidate distributions for the first and second categories of data. This is done through fitting seven real-world datasets to eight candidate distributions, which can be divided into two types: (a) common distributions like the Weibull distribution, and (b) the folded-normal distribution (FND) and its variants such as generalized and power half-normal distributions. Main conclusions are that the normal assumption does not hold for the data considered in this paper, the measurement data can be appropriately modeled by some of the common distributions, and the transformed data can be appropriately modeled by the FND or its variants. These are useful for QC modeling in process capability analysis. © 2024 IEEE.

关键词： Weibull distribution

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Study of thermal effects on wavefront distribution in a high-power laser processing head

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Infrared Physics and Technology 2025年 148卷

作者： Wu, Yehao Liu, Wenwen Luo, Peikai Zheng, Pengcheng Zhu, Xiaowei Zhu, Dehua Cao, Yu College of Mechanical & Electrical Engineering Wenzhou University Wenzhou325035 China Zhejiang Provincial Innovation Center of Laser Intelligent Equipment Technology Zhejiang Wenzhou325200 China Zhejiang Provincial Key Laboratory of Laser Processing Robotics College of Mechanical & Electrical Engineering Wenzhou University Wenzhou325035 China

The intricate thermal phenomena including thermotropic deformation and thermal blooming effect inside the cavity of a twelve-kilowatt power laser processing head were thoroughly investigated using COMSOL Multiphysics software. By constructing the mapping relationship between the wavefront aberration/focal plane position maps of collimating and focusing lenses and the thermal effects, the influence laws on lens body/coating deformations and thermally induced deformations of the clamping mechanism for the lens surface temperature were achieved and visualized, as well as how these deformations further altered the beam quality and wavefront. Meanwhile, the experimental verification based on the Shack-Hartmann wavefront sensor ensured the accuracy of the simulation results. In addition, it was also explored that controlling the gas flow rate in the cavity in the range of 0.13 m/s-0.15 m/s under a helium environment can effectively alleviate the focal plane shift caused by the thermal blooming effect. These findings are of practical significance for optimizing the processing quality of high-power laser, especially in controlling thermal effect. © 2025

关键词： laser materials processing

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Control of the metallographic and mechanical properties of Cr8 cold-work die steel by laser continuous / dispersed quenching

Control of the metallographic and mechanical properties of C...

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Pacific-Rim laser Damage 2023: Optical Materials for High-Power lasers

作者： Kuang, Weiquan Zheng, Yu Chen, Jie Liu, Wenwen Peng, Wenhai Ye, Zongyi Cao, Yu Zhejiang Provincial Key Laboratory of Laser Processing Robotics China International Science and Technology Cooperation Base for Laser Processing Robot College of Mechanical and Electrical Engineering Wenzhou University Wenzhou325035 China Zhejiang Wuma Reducer Co. Ltd. Zhejiang Wenzhou325019 China Zhejiang Qidi Technology Co. Ltd. Zhejiang Wenzhou325035 China Wenzhou University Rui'an Graduate College Rui'an Zhejiang325200 China

ISBN: (纸本)9781510672826

laser continuous/dispersed quenching techniques were used for surface hardening Cr8 cold work die steel, and its metallographic microstructures and mechanical properties are investigated in this work. Typical mixed structure which composed of carbides in different morphologies and acicular martensite can be obtained by laser quenching. The excellent wear resistance and surface hardness of Cr8 die steel are attributed to the synergistic effect of solid solution strengthening, grain refinement and high dislocation density. Meanwhile, the phase change hardening layer structure and residual tensile stress induced by full area coverage scanning (LCQ) are the main factors to deteriorate the impact toughness and bending performance after laser quenching. The soft substrate-hardened unit structure with laterally spaced distribution (LDQ) obtained by graphical scanning reduces the heat accumulation effect on the surface, which reduces concentration of deformation near the hardened layer. The bending property and fracture mechanism are studied. Compared with the forging die material treated by LCQ, the impact energy and bending resistances of forging die materials treated by LDQ are enhanced significantly. Consequently, Cr8 die steel takes into account the same wear resistance, and scanning strategy should be controlled to retain more interval distribution hardening units in layer structure for superior impact toughness and bending properties. © 2023 SPIE.

关键词： Microstructure

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A Mode-based Approach for Lognormal Parameter Estimation on Heavily Censored Data 13

A Mode-based Approach for Lognormal Parameter Estimation on ...

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13th International Conference on Reliability, Maintainability, and Safety, ICRMS 2022

作者： Jiang, R.Y. Qi, F.Q. Cao, Y. China International Science and Technology Cooperation Base for Laser Processing Robotics Wenzhou University Wenzhou China College of Mechanical and Electrical Engineering Wenzhou University Wenzhou China Zhejiang Provincial Key Laboratory of Laser Processing Robotics College of Mechanical and Electrical Engineering Wenzhou University Wenzhou China

ISBN: (数字)9781665486903

ISBN: (纸本)9781665486903

The density function of the lognormal distribution is unimodal and its mode is always smaller than its median life. For the type-I censoring test, if the censoring time is not larger than the median life, the censoring degree of the dataset obtained in this way will be larger than 50% on average, implying that the dataset is heavily censored. In this case, the classical parameter estimation methods generally cannot provide stable estimates, but a relatively accurate estimate of the mode can be obtained. According to this argument, this paper proposes a mode-based approach for estimating the parameters of the lognormal distribution on heavily censored data. The proposed approach first uses the midpoint Kaplan-Meier estimator to augment the data;then uses the lognormal Q-Q plot to estimate the mode of the density function, from which the scale parameter can be expressed as a function of the shape parameter;and finally uses a single-parameter maximum likelihood method to estimate the shape parameter. Six datasets are analyzed to illustrate the proposed approach and its appropriateness. © 2022 IEEE.

关键词： Parameter estimation

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High Performance Soft Electrochemical Actuators Based on Hierarchical Conductive Polymer Ionogels

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Journal of Bionic Engineering 2023年第6期20卷 2755-2763页

作者： Hongwei Hu Shengtao Zhang Yan Li Xinghao Hu Lin Xu Aixin Feng Guanggui Cheng Jianning Ding Zhejiang Provincial Key Laboratory of Laser Processing Robotics College of Mechanical and Electrical EngineeringWenzhou UniversityWenzhou325035China Institute of Intelligent Flexible Mechatronics Jiangsu UniversityZhenjiang212013China School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang212100China School of Mechanical Engineering Yangzhou UniversityYangzhou225127China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou UniversityChangzhou213164China Ruian Graduate School of Wenzhou University Ruian325207ZhejiangChina

Electrochemical actuators based on conductive polymers are emerging as a strong competitive in the field of soft actuators because of their intrinsically conformable/elastic nature,low cost,low operating voltage and air-working *** development has shown that adding electroactive materials,such as CNT and graphene,can improve their actuation *** the complex material systems used,their output strains(one of the key factors)are generally lower than 1%,which limited further applications of them in multiple ***,we report soft electrochemical actuators based on conductive polymer ionogels by embedding polyaniline particles between the PEDOT:PSS *** show that such a hierarchical structure not only leads to a high conductivity(1250 S/cm)but also improved electrochemical *** a low operating voltage of 1 V,the maximum strain of these soft actuators reaches an exceptional value of 1.5%,with a high blocking force of 1.3 *** these high-performance electrochemical actuators,we demonstrate soft grippers for manipulating object and a bionic flower stimulated by an electrical *** work sets an important step towards enabling the enhanced performance of electrochemical actuators based on conductive polymers with designed microstructures.

关键词： Conductive polymer Soft actuator Polyaniline PEDOT:PSS Bioinspired actuator

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Enhanced photonic nanojets for submicron patterning

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Journal of Central South University 2022年第10期29卷 3323-3334页

作者： ZHOU Zhuang-zhuang ALI Hassan HOU Zhi-shan XUE Wei CAO Yu Zhejiang Provincial Key Laboratory of Laser Processing Robotics College of Mechanical and Electrical EngineeringWenzhou UniversityWenzhou 325035China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou UniversityWenzhou 325000China China International Science&Technology Cooperation Base for Laser Processing Robotics Wenzhou UniversityWenzhou 325035China

Photonic nanojets(PNJs) have a wide range of applications in laser processing, nanolithography, optical highdensity storage, super-resolution microscopy, and other fields due to their processing capacity to overcome the diffraction limit. Herein, we control static microsphere be developed into the motion state to fabricate vector graphics *** microspheres roll on the substrate while the laser is kept synchronously irradiated, and the overlapping PNJ ablated craters form patterned grooves on the indium-tin oxide(ITO) substrate. Thus, PNJ has been expanded from “point”processing to “line” processing. The fabricated nano grooves have high continuity and consistency. Whereas, the precise customization of critical groove dimension can be achieved via modulation in diameter and kinetics of dielectric microshperes. Furthermore, by etching vectographs on an ITO conductive glass substrate, we demonstrated the advantages and potential of the proposed method in nanopatterning. The proposed method effectively reduces the cost and complexity of photonic nanojets applied in nanopatterning. The proposed nanopatterning methodology will play a vital role in the fabrication of semiconductor materials, sensors, microfluidic devices, surface-enhanced Raman scattering(SERS), biomedicine, nanoscience and nanoengineering.

关键词： photonic nanojets nano-grooves synchronously irradiated nanoengineering

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Fabrication of Cf/SiC composites by direct selective laser sintering and liquid silicon infiltration

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Materials Today Communications 2025年 46卷

作者： Wan, Changjie Geng, Yanfei Chen, Xizhang Zhang, Shuai Lin, Xiao Lin, Dingan Xue, Wei Fang, Tiehui Lang, Wenchang Zhejiang Provincial Key Laboratory of Laser Processing Robotics College of Mechanical and Electrical Engineering Wenzhou University China China International Science & Technology Cooperation Base for Laser Processing Robotics Wenzhou University China YUSHI Film Technology Co. Ltd. Jiangsu Huaian China Zhejiang Wenzhou China Key Laboratory of Surface Modification School of Intelligent Manufacturing Wenzhou Polytechnic Wenzhou325035 China

Selective laser Sintering (SLS) technology has demonstrated significant potential in the production of high-precision, complex Cf/SiC ceramic matrix composites. However, traditional additive manufacturing methods typically require the incorporation of binders, such as resins, into the raw powders. These processes are often complex, and the removal of binders during debinding can lead to volumetric shrinkage, which negatively affects the dimensional accuracy of the final product. To address this, a novel approach based on SLS technology for manufacturing Cf/SiC composites has been developed. By directly laser sintering a mixture of carbon fiber and silicon carbide powders, Cf/SiC ceramic preforms were successfully fabricated. These preforms were then infiltrated with liquid silicon (LSI) to produce Cf/SiC ceramic composites. Experimental results indicate that the addition of carbon fiber significantly enhanced the physical properties of the preforms, which in turn influenced the microstructure and mechanical properties of the final Cf/SiC composites. The maximum density, flexural strength, and fracture toughness of the fabricated Cf/SiC composites were 2.620 ± 0.127 g/cm³, 143.59 ± 6.51 MPa, and 3.43 ± 0.20 MPa·m1/2, respectively, demonstrating the feasibility of this method for producing near-net-shape Cf/SiC ceramic matrix composite parts with complex structures. © 2025 Elsevier Ltd

关键词： Fracture toughness

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A patterned Janus textile patch for monitoring multiple biomarkers

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Sensors and Actuators B: Chemical 2025年 440卷

作者： Liu, Shengchuang Dong, Yujie Zhang, Zhengya Xue, Wei Li, Fengping Hou, Zhishan Li, Xiaogang Zhang, Kunpeng Ke, Yirui Fang, Tiehui Feng, Guang Zhejiang Provincial Key Laboratory of Laser Processing Robotics College of Mechanical and Electrical Engineering Wenzhou University Wenzhou325035 China Oujiang Laboratory Zhejiang Laboratory for Regenerative Medicine Vision and Brain Health Wenzhou325035 China Wenzhou Key Laboratory of Ultrafast Laser Precision Manufacturing Technology Wenzhou325035 China College of Mechanical Engineering Zhejiang University of Technology Hangzhou310023 China

With the rapid development of wearable sensing technologies and the increasing public demand for non-invasive health monitoring, sweat analysis has evolved from its initial application in diagnosing cystic fibrosis and detecting banned substances to non-invasive monitoring of sweat rate and biomarkers. However, most sweat sensors pursue flexible and stretchable elastomeric substrates, ignoring the fact that airtight or adhesive substrates can cause compensatory sweating, which affects normal perspiration and long-term wear comfort. Furthermore, sweat sensors based on soft microfluidic systems lack active mechanisms for sweat collection and discharge. In this study, we present a patterned Janus textile sweat sensor (P-Janus sweat sensor) with high breathability and efficient sweat collection for real-time monitoring of sweat analyte concentration. The main component of the sweat collection device is a patterned Janus membrane with properties for longitudinal fluid transport and lateral fluid aggregation, which is prepared by laser ablation of hydrophobically modified non-woven fabric (HMN fabric) to generate hydrophilic patterns, followed by electrostatic spinning of a nanofiber layer. This patterned Janus membrane can guide the continuous flow of sweat to the detection electrode and prevent sweat accumulation. Experimental results demonstrate that the device can detect the concentration of a wide range of biomarkers, including pH, Na+, K+, glucose, and lactate, during continuous exercise. The device provides a cost-effective fabrication strategy for wearable sweat sensors and shows potential for integration with clothing and smart textiles. © 2025 Elsevier B.V.

关键词： Flexible electronics

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