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Analysis of the vibration characteristics of pin-connected hammer rotor of straw rubbing filament machine

Noise and Vibration Worldwide 2023年第6期54卷 281-290页

作者： Zhao, Yu Zhai, Zhiping Zhou, Qiang Shi, Suchuan Zhang, Xinhai Lan, Yuezheng College of Mechanical Engineering Inner Mongolia University of Technology Hohhot Inner Mongolia China Inner Mongolia National Mechanical Basic Experimental Teaching Demonstration Center Inner Mongolia China

The finite element method and the 3D laser Doppler measurement technology were used to simulate and test the vibration characteristics of the pin-connected hammer rotor. This was done to determine the critical speeds of the pin-connected hammer rotor of the straw rubbing filament machine and avoid the resonance of the straw rubbing filament machine during operation. The frequencies and mode shapes of the rotor’s first six free modes were determined. The accuracy of the pin-connected hammer rotor finite element model is validated by comparing calculation and test values. On this basis, the prestressed modes of the pin-connected hammer rotor under actual working conditions are calculated. The effect of the hammer swing angles rotating around the pin shaft is investigated, and the critical speeds of the pin-connected hammer rotor are calculated. The results indicate that the rotor has the same mode shapes at 11 kinds of joint swing angles, and the maximum relative error for each order frequency is 0.88%. It can be seen that the hammer-pin swing angles have little effect on the vibrational frequencies and mode shapes of the hammer-pin articulated rotor. Compared to the free modes, the prestressed modes all have an additional torsional mode and consist of two-mode shapes of global and local;the global mode shapes are similar to the free ones except for an additional torsional mode shape, with increased amplitudes and modal frequencies;the local mode shapes mainly occur in cutting knives and hammers. The critical speed range of the rotor of the 9ZR-2.2 straw rubbing filament machine must be 2076.99–2348.32 r/min which is based on ensuring the processing quality of straw. The study provides a reference method for investigating the vibration characteristics of pin-connected hammer rotors. It is also of great practical importance to scientifically predict the critical speed of a pin-connected hammer rotor in order to reduce failure and safety accidents. © The Author(s) 2023.

关键词： Modal analysis

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3D bioprinting of complex biological structures with tunable elastic modulus and porosity using freeform reversible embedding of suspended hydrogels

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Bio-Design and Manufacturing 2023年第5期6卷 550-562页

作者： Zhuang Chen Chuanzhen Huang Hanlian Liu Xu Han Zhichao Wang Shuying Li Jun Huang Zhen Wang Centre for Advanced Jet Engineering Technology(CaJET) Key Laboratory of High-Efficiency and Clean Mechanical Manufacture(Ministry of Education)National Experimental Teaching Demonstration Center for Mechanical Engineering(Shandong University)School of Mechanical EngineeringShandong UniversityJinan 250061China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

Three-dimensional(3D)bioprinting has been used widely for the construction of hard tissues such as bone and ***,constructing soft tissues with complex structures remains a *** this study,complex structures characterized by both tunable elastic modulus and porosity were printed using freeform reversible embedding of suspended hydrogels(FRESHs)printing methods.A mixture of alginate and gelatin was used as the main functional component of the *** analysis showed that this bioink possesses shear thinning and shear recovery properties,supporting both cryogenic and FRESH printing *** printing capabilities and limitations of cryogenic and FRESH printing were then analyzed by printability tests.A series of complex structures were printed by FRESH printing methods which could not be realized using conventional *** tests and scanning electron microscopy analysis showed that the printed structure is of excellent flexibility and could be applied in various conditions by adjusting its mechanical modulus and porosity.L929 fibroblast cells maintained cell viability in cell-laden-printed structures,and the addition of collagen further improved the hydrogels’***,all results provided useful insight into the building of human soft tissue organ blocks.

关键词： Bioink Freeform reversible embedding of suspended hydrogels(FRESHs)printing 3D extrusion cell-laden printing Tissue engineering Tunable elastic modulus and porosity

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Effect of Free-End Torsion on the Corrosion and mechanical Properties for Mg-3Zn-0.2Ca Alloy

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Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 59-70页

作者： Li-Lan Gao Jiang Ma Yan-Song Tan Xiao-Hao Sun Qi-Jun Gao De-Bao Liu Chun-Qiu Zhang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin300384China School of Materials Science and Engineering Tianjin University of TechnologyTianjin300384China

Magnesium alloys with excellent degradability and biocompatibility are promising materials for biomedical implants,saving patients the burden of second ***,their mechanical properties and corrosion resistance are significantly below the requirements for implant *** study aims to improve the mechanical and corrosion resistance properties of Mg-3Zn-0.2Ca alloy by pre-torsion treatment,and find out the optimal shear *** rod-shaped Mg-3Zn-0.2Ca alloy specimens were pre-torsion treated at different torsion *** effect of free-end torsion on Mg-3Zn-0.2Ca alloy was characterized through microstructure analysis,mechanical testing,and corrosion ***-torsion treatment can refine grain and induce twins and dislocations in Mg-3Zn-0.2Ca *** surface hardness increases with the increase in torsion *** yield strength and ultimate strength initially increase and then decrease with increasing torsion angle,while ductility decreases with increasing torsion *** with a shear strain of 30%exhibit the highest tensile strength,reaching 284.78±10.62 MPa,with an elongation of 19.37±1.66%.Furthermore,they show a significant improvement in fatigue lives both before and after *** the stress amplitude is 120 MPa,the fatigue lives for specimens without pre-torsion treatment are 54,275 cycles and 4324 cycles before and after pre-corrosion,while they increased significantly to 92,015 cycles and 5050 cycles with the 30%shear strain,***,the 30%shear strain specimens show a significant reduction in corrosion *** conclusion,pre-torsion treatment can effectively modify the microstructure of Mg-3Zn-0.2Ca alloy,enhancing both mechanical properties and corrosion *** optimal shear strain for this improvement is 30%.This study provides a practical method to enhance the mechanical properties and corrosion resistance of Mg-3Zn-0.2Ca alloy,making it more suitable for biomedical implan

关键词： Magnesium alloy Pre-torsion Microstructure mechanical property Corrosion resistance

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Novel intelligent reasoning system for tool wear prediction and parameter optimization in intelligent milling

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Advances in Manufacturing 2024年第1期12卷 76-93页

作者： Long-Hua Xu Chuan-Zhen Huang Zhen Wang Han-Lian Liu Shui-Quan Huang Jun Wang School of Mechanical Engineering Yanshan UniversityQinhuangdao066004HebeiPeople’s Republic of China Center for Advanced Jet Engineering Technologies(CaJET) Key Laboratory of High-efficiency and Clean Mechanical Manufacture(Ministry of Education)National Experimental Teaching Demonstration Center for Mechanical Engineering(Shandong University)School of Mechanical EngineeringShandong UniversityJinan250061People’s Republic of China Institute of Manufacturing Technology Guangdong University of TechnologyGuangzhou510006People’s Republic of China

Accurate intelligent reasoning systems are vital for intelligent *** this study,a new intelligent reasoning system was developed for milling processes to accurately predict tool wear and dynamically optimize machining *** developed system consists of a self-learning algorithm with an improved particle swarm optimization(IPSO)learning algorithm,prediction model determined by an improved case-based reasoning(ICBR)method,and optimization model containing an improved adaptive neural fuzzy inference system(IANFIS)and *** results showed that the IPSO algorithm exhibited the best global convergence *** ICBR method was observed to have a better performance in predicting tool wear than standard CBR *** IANFIS model,in combination with IPSO,enabled the optimization of multiple objectives,thus generating optimal milling *** paper offers a practical approach to developing accurate intelligent reasoning systems for sustainable and intelligent manufacturing.

关键词： Improved particle swarm optimization(IPSO)algorithm Improved case-based reasoning(ICBR)method Adaptive neural fuzzy inference system(ANFIS)model Tool wear prediction Intelligent manufacturing

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Single-gait crawling robot:A solution for improving mobility and payload of soft locomotor via simple structure and easy control

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Science China(Technological Sciences) 2024年第11期67卷 3626-3628页

作者： MA Hao HAO TianZe MA JiChao SUN ZhenHao LI Xiang LIU YiBo XIAO HuaPing LIU ShuHai College of Mechanical and Transportation Engineering China University of Petroleum-BeijingBeijing 102249China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education(Tianjin University of Technology) Tianjin 300384China

Motion performance,including movement speed,adaptability to various environments,and load-carrying capability,is crucial for soft crawling robots,tasked with field exploration and the transporting material in often complex and unstructured environments.A wide variety of soft crawling robots,which are driven by electricity[1],chemical power[2],and pressurized fluid[3]to move forward via cyclic deformation,have thus far been inspired by the mobile patterns of soft-bodied animals,such as worms[4],snake[5],octopus[6],*** performance of soft robots in terms of speed and load has developed impressively in recent years.

关键词： robot payload environments

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Optimization of teaching Evaluation Methods for Comprehensive Practice Courses in Mechatronic engineering Based on GMM Algorithm 13

Optimization of Teaching Evaluation Methods for Comprehensiv...

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13th IEEE International Conference on engineering Education, ICEED 2024

作者： Jiang, Jin-Gang Xue, Zhong-Hao Dai, Ye Bao, Yu-Dong Tang, De-Dong Du, Hai-Yan School of Mechanical and Power Engineering Harbin University of Science and Technology Harbin China National Experimental Teaching Demonstration Center for Mechanical Engineering Experiment and Practice Harbin University of Science and Technology Harbin China

ISBN: (纸本)9798350367416

Aiming at the problems existing in the teaching evaluation method of the comprehensive practice course of Mechatronic engineering based on the concept of OBE engineering education, using the GMM algorithm for clustering, relying on the provincial higher education teaching reform project, optimizing the teaching evaluation method of the course, so as to improve the OBE teaching mode of the 'comprehensive practice' course with a multilevel and diversified teaching evaluation system, to cultivate the students' ability to apply knowledge comprehensively and their ability to engage in engineering practice and their sense of innovation, and to satisfy the new requirements of 'New engineering' and 'Made in China 2025' for the electromechanical majors and to promote the enhancement of the quality of the personnel training for the Mechatronic engineering majors. © 2024 IEEE.

关键词： Personnel training

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A new modeling approach for stress-strain relationship taking into account strain hardening and stored energy by compacted graphite iron evolution

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Frontiers of mechanical engineering 2023年第4期18卷 195-209页

作者： Jiahui NIU Chuanzhen HUANG Zhenyu SHI Hanlian LIU Zhengyi TANG Binghao LI Zhen CHEN Guoyan JIANG Center for Advanced Jet Engineering Technologies(CaJET) Key Laboratory of High-efficiency and Clean Mechanical Manufacture(Ministry of Education)National Experimental Teaching Demonstration Center for Mechanical Engineering(Shandong University)School of Mechanical EngineeringShandong UniversityJinan 250061China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Dongfang Electric(Guangzhou)Heavy Machinery Co. Ltd.Guangzhou 511455China

Compacted graphite iron(CGI)is considered to be an ideal diesel engine material with excellent physical and mechanical properties,which meet the requirements of energy conservation and emission ***,knowledge of the microstructure evolution of CGI and its impact on flow stress remains *** this study,a new modeling approach for the stress–strain relationship is proposed by considering the strain hardening effect and stored energy caused by the microstructure evolution of *** effects of strain,strain rate,and deformation temperature on the microstructure of CGI during compression deformation are examined,including the evolution of graphite morphology and the microstructure of the pearlite *** roundness and fractal dimension of graphite particles under different deformation conditions are *** with finite element simulation models,the influence of graphite particles on the flow stress of CGI is *** distributions of grain boundary and geometrically necessary dislocations(GNDs)density in the pearlite matrix of CGI under different strains,strain rates,and deformation temperatures are analyzed by electron backscatter diffraction technology,and the stored energy under each deformation condition is *** show that the proportion and amount of low-angle grain boundaries and the average GNDs density increase with the increase of strain and strain rate and decreased first and then increased with an increase in deformation *** increase in strain and strain rate and the decrease in deformation temperature contribute to the accumulation of stored energy,which show similar variation trends to those of GNDs *** parameters in the stress–strain relationship model are solved according to the stored energy under different deformation *** consistency between the predicted results from the proposed stress–strain relationship and the experimental results shows that the evolution of stored ene

关键词： stress−strain relationship microstructure evolution stored energy strain hardening graphite morphology

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An automatic docking method for large-scale sections based on real-time pose measuring and assembly deviation control

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Optoelectronics Letters 2023年第11期19卷 686-692页

作者： QIAO Zhifeng FU Kang LIU Zhenzhong Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin300384China

Aiming at the problem of poor accuracy consistency of large sections’docking assembly,an automatic docking method using multiple laser trackers to measure the position and posture of the docking sections in real time was *** the solution of the pose of the docking section,real-time pose measurement of the docking section was realized by establishing a global coordinate system and a coordinate fusion method of three or more laser *** the automatic control of the docking process,the real-time communication protocol and the circular negative feedback control strategy of measurement-adjustment-re-measurement are adopted,and the fully-automated docking of large sections is ***,an experimental verification system was set up,and the docking of the large-scale section reduction models was realized under the requirements of docking accuracy,and the effectiveness of the automatic docking scheme was successfully verified.

关键词： coordinate deviation system

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Research on Practical teaching System of Intelligent Manufacturing engineering: A Case Study of Major Design 24

Research on Practical Teaching System of Intelligent Manufac...

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2024 International Conference on Artificial Intelligence and Future Education, AIFE 2024

作者： Yang, Lu Wu, Yining Li, Zeyu Zhang, Guobin Tian, He Tianjin Key Laboratory for Advanced Mechanical System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China

ISBN: (纸本)9798400710650

Based on the construction requirements of the "Emerging engineering"major in intelligent manufacturing engineering and the characteristics of interdisciplinary integration, the cultivation of high-quality interdisciplinary talents has been established as the primary objective. By coordinating multiple on-campus and off-campus resources and fostering cohesion within the entire discipline supervisor team, the "academic supervisor system"training mode has been established, and the continuous training mechanism for "undergraduate and master's"programs has been effectively developed. Additionally, school-enterprise collaborations have been implemented, and practical bases have been successfully established. With the support of the entire discipline supervisor team and the closed-loop integrated laboratory, the practical teaching system characterized by cross-integration and systematic progression has been developed at our university. By creating a step-by-step, planned, and systematic practical course system, the issues of standardization, randomization, and fragmentation within practical courses have been effectively resolved. Through the integration of project-based courses and school-enterprise co-constructed courses, students' innovative abilities are further enhanced. It then describes the design and implementation methods of major design, and analyzes its practical effects. It holds significant reference and demonstrative value for the construction of practical courses, laboratories, and the talent cultivation model of the "Emerging engineering"major. © 2024 Copyright held by the owner/author(s).

关键词： Smart manufacturing

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Project-Based Learning and Simulation Platform of Instructional Robot control

Project-Based Learning and Simulation Platform of Instructio...

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International Conference on Guidance, Navigation and control, ICGNC 2020

作者： Mao, Yinan Wang, Tao Wang, Yujia Hu, Hong Wang, Lingling Li, Zexin Beihang University Beijing100191 China Experimental Teaching Demonstration Center of Mechanical and Control Engineering Beihang University Beijing100191 China

ISBN: (纸本)9789811581540

Robots play an important role in the industrial field now, especially in intelligent manufacturing. This paper proposes a project-based MATLAB and Unity teaching simulation platform, which uses the graphical user interface (GUI) and 3D animation to provide an effective learning environment for college students to learn the basic principles of robot control. The experimental project of the training module includes six parts and the corresponding small experiment is designed and developed in each part. On the basis of the modular experiment, the challenging project and creative task of writing robot are completed. The effectiveness of the project is evaluated by the questionnaire data and grade anonymously. The results show that the students can avoid the interference of the subordinate problems by the simulation platform. Students’ interest is fully aroused through real-time animation and autonomous tasks. The teaching is geared to the needs of intelligent manufacturing and fits with engineering practice to develop students’ key skills, such as logical analysis and creative thinking, which lay the foundation for solving practical engineering problems in the future. © 2022, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Students

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