Chinese Journal of Mechanical Engineering最新文献_第3页

Design of a High Precision Multichannel 3D Bioprinter 设计高精度多通道三维生物打印机

IF 4.2 2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-27 DOI: 10.1186/s10033-023-00935-0

Jintao Li, Bin Zhang, Yichen Luo, Huayong Yang

引用次数: 0

Fault Diagnosis Method for Rotating Machinery Based on Multi-scale Features 基于多尺度特征的旋转机械故障诊断方法

IF 4.2 2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-27 DOI: 10.1186/s10033-023-00966-7

Ruijun Liang, Wenfeng Ran, Yao Chen, Rupeng Zhu

引用次数: 0

Effects of Electric and Magnetic Treatments on Microstructures of Solid Metals: A Review 电处理和磁处理对固体金属微结构的影响：综述

IF 4.2 2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-24 DOI: 10.1186/s10033-023-00961-y

Yanli Song, Wenlin Wu, Yongqing Yu, Lin Hua

引用次数: 0

A 5M Synchronization Mechanism for Digital Twin Shop-Floor 数字孪生车间的 5M 同步机制

IF 4.2 2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-17 DOI: 10.1186/s10033-023-00965-8

Weiran Liu, Jiangfeng Cheng, Zhiwen Wen, Xiaofu Zou, Zhaozong Wang, Hongting Liu, Fei Tao

引用次数: 0

Dynamic Investigations on the Wear Behavior of a 3D Revolute Joint Considering Time-Varying Contact Stiffness: Simulation and Experiment 考虑时变接触刚度的 3D 旋转接头磨损行为的动态研究：模拟与实验

IF 4.2 2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-17 DOI: 10.1186/s10033-023-00949-8

Li Zhang, Yining Fang, Guanghan Bai, Junyong Tao

引用次数: 0

A New Dynamics Analysis Model for Five-Axis Machining of Curved Surface Based on Dimension Reduction and Mapping 基于降维映射的曲面五轴加工动力学分析新模型

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-13 DOI: 10.1186/s10033-023-00964-9

Minglong Guo, Zhaocheng Wei, Minjie Wang, Zhiwei Zhao, Shengxian Liu

{"title":"A New Dynamics Analysis Model for Five-Axis Machining of Curved Surface Based on Dimension Reduction and Mapping","authors":"Minglong Guo, Zhaocheng Wei, Minjie Wang, Zhiwei Zhao, Shengxian Liu","doi":"10.1186/s10033-023-00964-9","DOIUrl":"https://doi.org/10.1186/s10033-023-00964-9","url":null,"abstract":"Abstract The equipment used in various fields contains an increasing number of parts with curved surfaces of increasing size. Five-axis computer numerical control (CNC) milling is the main parts machining method, while dynamics analysis has always been a research hotspot. The cutting conditions determined by the cutter axis, tool path, and workpiece geometry are complex and changeable, which has made dynamics research a major challenge. For this reason, this paper introduces the innovative idea of applying dimension reduction and mapping to the five-axis machining of curved surfaces, and proposes an efficient dynamics analysis model. To simplify the research object, the cutter position points along the tool path were discretized into inclined plane five-axis machining. The cutter dip angle and feed deflection angle were used to define the spatial position relationship in five-axis machining. These were then taken as the new base variables to construct an abstract two-dimensional space and establish the mapping relationship between the cutter position point and space point sets to further simplify the dimensions of the research object. Based on the in-cut cutting edge solved by the space limitation method, the dynamics of the inclined plane five-axis machining unit were studied, and the results were uniformly stored in the abstract space to produce a database. Finally, the prediction of the milling force and vibration state along the tool path became a data extraction process that significantly improved efficiency. Two experiments were also conducted which proved the accuracy and efficiency of the proposed dynamics analysis model. This study has great potential for the online synchronization of intelligent machining of large surfaces.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"47 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136346377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Improved Time-Domain Inverse Technique for Localization and Quantification of Rotating Sound Sources 一种改进的旋转声源定位与量化时域反演技术

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-07 DOI: 10.1186/s10033-023-00958-7

Xiaozheng Zhang, Yinlong Li, Yongbin Zhang, Chuanxing Bi, Jinghao Li, Liang Xu

{"title":"An Improved Time-Domain Inverse Technique for Localization and Quantification of Rotating Sound Sources","authors":"Xiaozheng Zhang, Yinlong Li, Yongbin Zhang, Chuanxing Bi, Jinghao Li, Liang Xu","doi":"10.1186/s10033-023-00958-7","DOIUrl":"https://doi.org/10.1186/s10033-023-00958-7","url":null,"abstract":"Abstract The time-domain inverse technique based on the time-domain rotating equivalent source method has been proposed to localize and quantify rotating sound sources. However, this technique encounters two problems to be addressed: one is the time-consuming process of solving the transcendental equation at each time step, and the other is the difficulty of controlling the instability problem due to the time-varying transfer matrix. In view of that, an improved technique is proposed in this paper to resolve these two problems. In the improved technique, a de-Dopplerization method in the time-domain rotating reference frame is first applied to eliminate the Doppler effect caused by the source rotation in the measured pressure signals, and then the restored pressure signals without the Doppler effect are used as the inputs of the time-domain stationary equivalent source method to locate and quantify sound sources. Compared with the original technique, the improved technique can avoid solving the transcendental equation at each time step, and facilitate the treatment of the instability problem because the transfer matrix does not change with time. Numerical simulation and experimental results show that the improved technique can eliminate the Doppler effect effectively, and then localize and quantify the rotating nonstationary or broadband sources accurately. The results also demonstrate that the improved technique can guarantee a more stable reconstruction and compute more efficiently than the original one.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"54 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135476486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Well-Dispersed Graphene Enhanced Lithium Complex Grease Toward High-Efficient Lubrication 分散良好的石墨烯增强锂复合润滑脂实现高效润滑

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-02 DOI: 10.1186/s10033-023-00959-6

Kaiyue Lin, Zhuang Zhao, Yuting Li, Zihan Zeng, Xiaofeng Wei, Xiaoqiang Fan, Minhao Zhu

{"title":"Well-Dispersed Graphene Enhanced Lithium Complex Grease Toward High-Efficient Lubrication","authors":"Kaiyue Lin, Zhuang Zhao, Yuting Li, Zihan Zeng, Xiaofeng Wei, Xiaoqiang Fan, Minhao Zhu","doi":"10.1186/s10033-023-00959-6","DOIUrl":"https://doi.org/10.1186/s10033-023-00959-6","url":null,"abstract":"Abstract Graphene as a lubricating additive holds great potential for industrial lubrication. However, its poor dispersity and compatibility with base oils and grease hinder maximizing performance. Here, the influence of graphene dispersion on the thickening effect and lubrication function is considered. A well-dispersed lubricant additive was obtained via trihexyl tetradecyl phosphonium bis(2-ethylhexyl) phosphate modified graphene ([P 66614 ][DEHP]-G). Then lithium complex grease was prepared by saponification with 12-OH stearic acid, sebacic acid, and lithium hydroxide, using polyalphaolefin (PAO20) as base oil and the modified-graphene as lubricating additive, with the original graphene as a comparison. The physicochemical properties and lubrication performance of the as-prepared greases were evaluated in detail. The results show that the as-prepared greases have high dropping point and colloidal stability. Furthermore, modified-graphene lithium complex grease offered the best friction reduction and anti-wear abilities, manifesting the reduction of friction coefficient and wear volume up to 18.84% and 67.34%, respectively. With base oil overflow and afflux, well-dispersed [P 66614 ][DEHP]-G was readily adsorbed to the worn surfaces, resulting in the formation of a continuous and dense graphene deposition film. The synergy of deposited graphene-film, spilled oil, and adhesive grease greatly improves the lubrication function of grease. This research paves the way for modulating high-performance lithium complex grease to reduce the friction and wear of movable machinery.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"21 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135935807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Micro Abrasive Slurry Jet Polishing on Properties of Coated Cemented Carbide Tools 微磨料浆射流抛光对涂层硬质合金刀具性能的影响

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.1186/s10033-023-00948-9

Rongjuan Wang, Chengyong Wang

{"title":"Effect of Micro Abrasive Slurry Jet Polishing on Properties of Coated Cemented Carbide Tools","authors":"Rongjuan Wang, Chengyong Wang","doi":"10.1186/s10033-023-00948-9","DOIUrl":"https://doi.org/10.1186/s10033-023-00948-9","url":null,"abstract":"Abstract Owing to the popularization of coating technology, physical Vapor Deposition (PVD) coated tools have become indispensable in the cutting process. Additionally, the post-treatment of coated tools applied to industrial production can effectively enhance the surface quality of coating. To improve the processing performance of coated tools, micro abrasive slurry jet (MASJ) polishing technology is first applied to the post-treatment of coated tools. Subsequently, the effects of process parameters on the surface quality and cutting thickness of coating are investigated via single-factor experiments. In the experiment, the best surface roughness is obtained by setting the working pressure to 0.4 MPa, particle size to 3 μm, incidence angle to 30°, and abrasive mass concentration to 100 g/L. Based on the results of the single-factor experiments, combination experiments are designed, and three types of coated tools with different surface qualities and coating thicknesses are obtained. The MASJ process for the post-treatment of coated tools is investigated based on a tool wear experiment and the effects of cutting parameters on the cutting force and workpiece surface quality of three types of cutting tools. The result indicates that MASJ machining can effectively improve the machining performance of coated tools.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"187 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135321420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FFT-Based Numerical Method for Nonlinear Elastic Contact 基于fft的非线性弹性接触数值方法

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-10-31 DOI: 10.1186/s10033-023-00953-y

Fei Guo, Fan Wu, Xinyong Li, Yijie Huang, Zhuo Wang

{"title":"FFT-Based Numerical Method for Nonlinear Elastic Contact","authors":"Fei Guo, Fan Wu, Xinyong Li, Yijie Huang, Zhuo Wang","doi":"10.1186/s10033-023-00953-y","DOIUrl":"https://doi.org/10.1186/s10033-023-00953-y","url":null,"abstract":"Abstract In theoretical research pertaining to sealing, a contact model must be used to obtain the leakage channel. However, for elastoplastic contact, current numerical methods require a long calculation time. Hyperelastic contact is typically simplified to a linear elastic contact problem, which must be improved in terms of calculation accuracy. Based on the fast Fourier transform, a numerical method suitable for elastoplastic and hyperelastic frictionless contact that can be used for solving two-dimensional and three-dimensional (3D) contact problems is proposed herein. The nonlinear elastic contact problem is converted into a linear elastic contact problem considering residual deformation (or the equivalent residual deformation). Results from numerical simulations for elastic, elastoplastic, and hyperelastic contact between a hemisphere and a rigid plane are compared with those obtained using the finite element method to verify the accuracy of the numerical method. Compared with the existing elastoplastic contact numerical methods, the proposed method achieves a higher calculation efficiency while ensuring a certain calculation accuracy (i.e., the pressure error does not exceed 15%, whereas the calculation time does not exceed 10 min in a 64 × 64 grid). For hyperelastic contact, the proposed method reduces the dependence of the approximation result on the load, as in a linear elastic approximation. Finally, using the sealing application as an example, the contact and leakage rates between complicated 3D rough surfaces are calculated. Despite a certain error, the simplified numerical method yields a better approximation result than the linear elastic contact approximation. Additionally, the result can be used as fast solutions in engineering applications.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"24 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135863615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1