Journal of Mechanical Science and Technology最新文献_第5页

Kinematic analysis of adjusting mechanism of bamboo and wood-based special-shaped panels sucker based on graph theory and closed-loop vector method 基于图论和闭环矢量法的竹木基异型板吸盘调节机构运动学分析

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-0839-9

Yimin Che, Wusheng Luo, Qi’ao Li

{"title":"Kinematic analysis of adjusting mechanism of bamboo and wood-based special-shaped panels sucker based on graph theory and closed-loop vector method","authors":"Yimin Che, Wusheng Luo, Qi’ao Li","doi":"10.1007/s12206-024-0839-9","DOIUrl":"https://doi.org/10.1007/s12206-024-0839-9","url":null,"abstract":"This article designs a suction cup adjustment mechanism for board conveyors, which has solved the problem of poor equipment adaptability caused by different shapes and sizes of bamboo and wood shaped boards during transportation. Firstly, a kinematic model of the mechanism was established by combining graph theory with closed-loop vector method, and its kinematics were systematically studied, including position, velocity, acceleration, and singular position, and the influence of main structural parameters on the motion behavior of the mechanism was discussed. Secondly, the dynamic model of the mechanism was established using the principle of Jean le Rond d’Alembert, and the driving force and internal forces acting on each component were obtained. Then, numerical simulation verification including kinematic and dynamic models was completed. Finally, the effectiveness of the mechanism was verified through the experiment of grasping heterogeneous boards. This study will lay a solid theoretical foundation for the application of this new type of heterogeneous boards suction cup gripper.","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Analytical formulation for sliding friction torque in cylindrical roller bearings 圆柱滚子轴承滑动摩擦力矩的解析公式

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-0805-6

Gilbert Rivera, Patrick John Po, Chan-sik Kang, Seong-Wook Hong

{"title":"Analytical formulation for sliding friction torque in cylindrical roller bearings","authors":"Gilbert Rivera, Patrick John Po, Chan-sik Kang, Seong-Wook Hong","doi":"10.1007/s12206-024-0805-6","DOIUrl":"https://doi.org/10.1007/s12206-024-0805-6","url":null,"abstract":"This paper presents an improved analytical formulation for analyzing the sliding friction torque in cylindrical roller bearings (CRBs), which are renowned for their outstanding radial load-carrying capacity. Although sliding friction in CRBs typically employs a minor heat source during rotation, its association with the roller-bearing starting torque is vital. In particular, their impact is substantial at higher rotational speeds when the centrifugal forces come into play. The intricacy lies in the manifestation of sliding friction torque between the rollers and races, stemming from non-uniform surface deformation. Two key aspects of the CRB sliding friction torque are considered in this study, the differential sliding friction torques caused by roller rotation and roller orbital motion. Additionally, a computational method for evaluating sliding friction based on pure rolling lines (PRLs) in the race contact area is introduced. This method incorporates an innovative updating algorithm that provides more precise insights into PRLs and sliding friction torque. The effectiveness of the proposed approach was then established through a comparative analysis of the empirical formulas provided by bearing manufacturers. This comparison underscores the potential of the method as a useful tool for comprehending and quantifying sliding friction torque within CRBs.","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

A study on the annular cylindrical tuned liquid damper for dynamic control of spar buoy based measurement system 基于测量系统的环形圆柱调谐液体阻尼器动态控制研究

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-0808-3

Taehyeong Kim, Seongyong Kim, Kyungjun Song

{"title":"A study on the annular cylindrical tuned liquid damper for dynamic control of spar buoy based measurement system","authors":"Taehyeong Kim, Seongyong Kim, Kyungjun Song","doi":"10.1007/s12206-024-0808-3","DOIUrl":"https://doi.org/10.1007/s12206-024-0808-3","url":null,"abstract":"This paper presents design method for a tuned liquid damper (TLD) to improve the stability of measurement system based on a spar buoy. Firstly, a TLD was designed utilizing the double-partition hull structure of spar buoy, and the theoretical natural sloshing frequency for this design was calculated. Next, an experimental study was conducted to verify the theoretical calculations. The experimental results showed that the natural sloshing frequency increased with the height of the fluid free-surface, and the values are in close agreement with the theoretical calculations. Finally, the TLD was installed to a free-drifting structure at sea, and the dynamic behavior reduction effect was experimentally verified. The results showed that the behavior of the structure is significantly reduced after the TLD is installed, especially for the behavior above 4 cm. The main contribution of this study is the integration of a TLD into the existing structure of the spar buoy, which enhances stability without compromising buoyancy. However, this approach is limited by the shape and volume constraints of the TLD, making it less effective across all wave-induced frequencies. Further research is required to extend its applicability to a broader range of maritime conditions.","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

A damage effectiveness evaluation approach of warhead fragment group on missile target based on intuitionistic fuzzy neural network 基于直觉模糊神经网络的弹头碎片群对导弹目标的损伤效果评估方法

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-0813-6

Jingyun Xue, Hanshan Li, Xiaoqian Zhang

引用次数: 0

In-situ defect detection in laser-directed energy deposition with machine learning and multi-sensor fusion 利用机器学习和多传感器融合技术在激光定向能量沉积过程中进行原位缺陷检测

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-2401-1

Lequn Chen, Seung Ki Moon

{"title":"In-situ defect detection in laser-directed energy deposition with machine learning and multi-sensor fusion","authors":"Lequn Chen, Seung Ki Moon","doi":"10.1007/s12206-024-2401-1","DOIUrl":"https://doi.org/10.1007/s12206-024-2401-1","url":null,"abstract":"Early defect identification in laser-directed energy deposition (L-DED) additive manufacturing (AM) is pivotal for preventing build failures. Traditional single-modal monitoring approaches lack the capability to fully comprehend process dynamics, leading to a gap in multisensor monitoring strategies. This research proposes a novel in-situ monitoring method using a multi-sensor fusion-based digital twin (MFDT) for localized quality prediction, coupled with machine learning (ML) models for data fusion. It investigates acoustic signals from laser-material interactions as defect indicators, crafting a ML-based pipeline for rapid defect detection via feature extraction, fusion, and classification. This approach not only explores acoustic features across multiple domains, as well as coaxial melt pool images for ML model training, but it also introduces a novel MFDT framework that combines data from coaxial melt pool vision cameras and microphones, synchronized with robotic movements, to predict localized quality attributes. The key novelty in this research is the exploration of intra-modality and cross-modality multisensor feature correlations, revealing key vision and acoustic signatures associated with varying process dynamics. A comprehensive understanding of how multi-sensor signature varies with process dynamics improves the effectiveness of the proposed multi-sensor fusion model. The proposed model outperforms conventional methods with a 96.4 % accuracy, thereby setting a solid foundation for future self-adaptive quality improvement strategies in AM.","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Fatigue assessment on 7075/2A12 aluminum alloy friction stir welding lap joints 7075/2A12 铝合金搅拌摩擦焊搭接接头的疲劳评估

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-0816-3

Ruijie Wang, Zhongde Wang, Guoshou Liu

{"title":"Fatigue assessment on 7075/2A12 aluminum alloy friction stir welding lap joints","authors":"Ruijie Wang, Zhongde Wang, Guoshou Liu","doi":"10.1007/s12206-024-0816-3","DOIUrl":"https://doi.org/10.1007/s12206-024-0816-3","url":null,"abstract":"Constant amplitude loading fatigue tests were carried out for 7075/2A12 dissimilar aluminum alloy friction stir welding (FSW) lap joints, and the fatigue fracture characteristics were observed accordingly. Experimental observation suggested that the effective lap sheet thickness had a salient effect on the fatigue strength of the specimen. Specimens tend to fail at the lower sheet thickness under low relatively loading, while fail at the hook root at higher loading. There exists a competition between the two failure cases, and the fracture site changes with loading levels. The stress/strain at the periphery of the weld nugget were discerned by elastic and elasto–plastic finite element analyses respectively, which were then utilized to evaluate the fatigue life by local life prediction approaches and notch stress methods. Two widely used local stress approaches, the Morrow’s modified Manson-Coffin (MMC) damage model and the Smith-Watson-Topper (SWT) damage model both could give reasonable results relatively close to experimental lives within the low cycle life regime. The notch stress method could give relatively closer life in the high cycle life regime.","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Disturbance compensation based robust backstepping control for 2-DOF electro-hydraulic tunneling robot 基于扰动补偿的 2-DOF 电液隧道机器人鲁棒后退控制

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-0837-y

Guotai Zhang, Gang Shen, Tenbo Ye, Dong Liu, Yu Tang, Xiang Li, Yongcun Guo

{"title":"Disturbance compensation based robust backstepping control for 2-DOF electro-hydraulic tunneling robot","authors":"Guotai Zhang, Gang Shen, Tenbo Ye, Dong Liu, Yu Tang, Xiang Li, Yongcun Guo","doi":"10.1007/s12206-024-0837-y","DOIUrl":"https://doi.org/10.1007/s12206-024-0837-y","url":null,"abstract":"In order to suppress the influence of uncertain disturbances on the trajectory tracking of hydraulic manipulator, a composite control strategy for the cutting electro-hydraulic driving system (CEHDS) of the tunneling robot is presented, which synthesizes the advantages of neural networks technique, recursive backstepping and adaptive control theory. The Lagrangian model with actuator dynamics is derived based on the practical tunneling robot. The back-stepping method is utilized for the strictly feedback state-space model. To address the matched and unmatched lumped uncertainties, the radial-basis-function neural networks (RBFNNs) are employed to approximate the unmatched term which contains the nonlinear friction torque and external cutting load in the mechanical subsystem. The nonlinear disturbance observer (NDOB) is utilized to estimate the matched lumped uncertainty in the hydraulic subsystem. Simultaneously, the adaptive robust mechanism is proposed to compensate the residual disturbances. Based on the Lyapunov theorem, the stability and the bounded tracking error of the CEHDS are obtained. The simulation and experimental results validate the effectiveness of the proposed method in comparison with the common backstepping and PID-controller approaches.","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Design of a padded patient specific wrist cast for 3D printing-thermoforming technique 设计用于三维打印-热成型技术的患者专用腕部软垫石膏

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-2404-y

Neilson Sorimpuk, Gan Jet Hong Melvin, Wai Heng Choong, Bih-Lii Chua

引用次数: 0

Optimal autofrettage process design for enhancing the fatigue life of the ultra-high-pressure hydrogen valve 提高超高压氢气阀门疲劳寿命的最佳自动修整工艺设计

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-0820-7

Taeyoung Kim, Hwa Young Kim

{"title":"Optimal autofrettage process design for enhancing the fatigue life of the ultra-high-pressure hydrogen valve","authors":"Taeyoung Kim, Hwa Young Kim","doi":"10.1007/s12206-024-0820-7","DOIUrl":"https://doi.org/10.1007/s12206-024-0820-7","url":null,"abstract":"This study investigated the optimal autofrettage pressure and design method for improving the fatigue life of an ultra-high-pressure hydrogen valve attached to an ultra-high-pressure hydrogen storage vessel, which is responsible for the supply and control of hydrogen gas. The theoretical values calculated by the theoretical equation for determining the hoop residual stress formed by autofrettage pressure in a circular cylinder and the analytical values of the hoop residual stress obtained through finite element analysis of the autofrettage process in a porous circular cylinder using the commercial finite element analysis program ANSYS Workbench were well matched. Based on the analysis technique obtained for the porous circular cylinder, a quantitative target lifespan was examined for the ultra-high-pressure hydrogen valve with the shape of a porous circular cylinder, considering the maximum pulse pressure. As a result, the previously manufactured ultra-high-pressure hydrogen valve did not meet the quantitative target lifespan. To address this, the optimal values of displacement at specific locations where fatigue failure occurs and autofrettage pressure were designed using response surface methodology (RSM). Through this, fatigue life of 172710 cycles more than 150000 cycles (quantitative target lifespan) was obtained.","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 microstructure on hydrogen uptake in SA 210 grade A1 steel studied using cyclic voltammetry and hydrogen permeation method 利用循环伏安法和氢渗透法研究微观结构对 SA 210 A1 级钢摄氢量的影响

IF 1.6 4区工程技术

Journal of Mechanical Science and Technology Pub Date : 2024-09-03 DOI: 10.1007/s12206-024-0818-1

Bagus Dwiprasetyo Raharjo Putra, Fariza Julio, Suwarno

{"title":"Effect of microstructure on hydrogen uptake in SA 210 grade A1 steel studied using cyclic voltammetry and hydrogen permeation method","authors":"Bagus Dwiprasetyo Raharjo Putra, Fariza Julio, Suwarno","doi":"10.1007/s12206-024-0818-1","DOIUrl":"https://doi.org/10.1007/s12206-024-0818-1","url":null,"abstract":"Carbon steel piping and tubing can be degraded by hydrogen uptake. The hydrogen permeation method is commonly applied to testing and qualification steel in response to hydrogen atom diffusion. Cyclic voltammetry (CV) has recently been proposed because it is a more straightforward method than permeation. A comprehensive study was conducted to investigate whether these two methods are comparable. A model alloy of SA 210 grade was studied. The study involved preparing specimens with varying microstructures through different heat treatments. Subsequently, metallographic analysis was conducted on each microstructural variation, followed by mechanical testing to evaluate the changes obtained before and after the hydrogen absorption test. The CV method consisted of three steps: CV before H absorption to search for a reference voltammogram, H charging, and CV after H absorption to determine the after-charge voltammogram. Electrochemical hydrogen permeation tests were performed in a Devanathan–Stachursky double cell. A comparison of the CV and permeation methods revealed that they show pretty similar results in evaluating the interaction between steel and hydrogen. Permeation methods provide quantitative results, while CV offers more qualitative insights. Both methods show that the quenched steel has the slowest hydrogen diffusion rate compared with those in normalized and base material conditions.","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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