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DESIGN AND MANUFACTURE OF SOFT FINGER-GLOVES FOR REHABILITATION OF INDIVIDUALS WITH DISABILITIES 设计和制造用于残疾人康复的软指套
Journal of Science and Technique Pub Date : 2024-04-02 DOI: 10.56651/lqdtu.jst.v19.n01.640
Xuan Hiep Trinh
{"title":"DESIGN AND MANUFACTURE OF SOFT FINGER-GLOVES FOR REHABILITATION OF INDIVIDUALS WITH DISABILITIES","authors":"Xuan Hiep Trinh","doi":"10.56651/lqdtu.jst.v19.n01.640","DOIUrl":"https://doi.org/10.56651/lqdtu.jst.v19.n01.640","url":null,"abstract":"This article presents the development and production process of a glove designed for rehabilitation, and enhancing object manipulation capabilities for individuals with hand mobility limitations, using soft finger design. The soft fingers are constructed from a composite structure consisting of silicone rubber material. An automated calculation program is created in Python and integrated with Abaqus/CAE software, enabling the concurrent exploration of numerous parameters governing the soft fingers to choose a rational design of glove. Experimental tests reveal that the error of the experiment and simulation results is less than 7.8%. Furthermore, these deformable soft fingers can closely mimic the contours of human fingers. Leveraging the successful construction of the soft fingers, a corresponding soft glove is manufactured. Preliminary validated experiments demonstrate the effectiveness of these soft gloves in aiding patients with diverse exercise rehabilitation. Additionally, they provide support for basic tasks such as grasping objects weighing approximately 600 grams.","PeriodicalId":509166,"journal":{"name":"Journal of Science and Technique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140753571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
STATIC ANALYSIS OF FG-CNTRC CYLINDRICAL SHELL SUBJECTED TO THERMO-MECHANICAL LOAD WITH TEMPERATURE-DEPENDENT PROPERTIES 受热机械载荷作用的 fg-cntrc 圆柱壳体的静力分析，其特性与温度有关
Journal of Science and Technique Pub Date : 2024-04-02 DOI: 10.56651/lqdtu.jst.v19.n01.646
{"title":"STATIC ANALYSIS OF FG-CNTRC CYLINDRICAL SHELL SUBJECTED TO THERMO-MECHANICAL LOAD WITH TEMPERATURE-DEPENDENT PROPERTIES","authors":"","doi":"10.56651/lqdtu.jst.v19.n01.646","DOIUrl":"https://doi.org/10.56651/lqdtu.jst.v19.n01.646","url":null,"abstract":"This article presents a thermo-elastic static analysis of the FG-CNTRC cylinderical shell subjected to a thermo-mechanical load. The temperature is assumed to vary through the thickness, and the temperature distribution is derived from the heat transfer formula. The gorvening equations of thermoelastic analysis are established by using the higher-order shear deformation theory, including the transverse normal stress effect. The material properties of FG-CNTRC are temperature-dependent. Using an analytical solution that used the single trigonometric series and the Laplace transformation to solve these equations of shell with the different boundary conditions. The present approach is validated by comparing the results with published results. The effects of different boundary conditions and temperatures on the displacement and stresses of the FG-CNTRC cylindrical shells are investigated. The results show the jumping variation of the stress components at the boundary position. Besides, when the temperature increases, the maximum absolute value of the axial stress increases while that of the circumferential stress decreases.","PeriodicalId":509166,"journal":{"name":"Journal of Science and Technique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140755194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CALCULATION OF FLOW SIMULATION IN COMBUSTION CHAMBER OF SOLID FUEL MOTOR WITH TWO-LAYER MIXED PROPELLANT 双层混合推进剂固体燃料发动机燃烧室内的流动模拟计算
Journal of Science and Technique Pub Date : 2024-04-02 DOI: 10.56651/lqdtu.jst.v19.n01.733
Tien Hoa Nguyen
{"title":"CALCULATION OF FLOW SIMULATION IN COMBUSTION CHAMBER OF SOLID FUEL MOTOR WITH TWO-LAYER MIXED PROPELLANT","authors":"Tien Hoa Nguyen","doi":"10.56651/lqdtu.jst.v19.n01.733","DOIUrl":"https://doi.org/10.56651/lqdtu.jst.v19.n01.733","url":null,"abstract":"This article presents a method of calculating the simulation of flow in solid fuel combustion chamber, which applied to the two-layer mixed solid propellant motor, using simulation software Ansys Fluent. The regression of burning surface of the propellant is simulated using dynamic meshing tool combined with user-defined functions (UDF), written in C++ programming language. The author proposes a method to calculate the average fire rate for mixed solid fuel, thereby simplifying the simulation process and still get results corresponding to the experimental results. The calculation thrust-time curve has a profile similar to the experimental results. The maximum thrust achieved during the steady burning phase is 4.98 kN, the correspoding experimental value is 5.0 kN.","PeriodicalId":509166,"journal":{"name":"Journal of Science and Technique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
INVESTIGATING THE STRESS DISTRIBUTION ON THE CLAMPED BOUNDARY OF FGM CYLINDRICAL SHELLS SUBJECTED TO STATIC LOADS USING THE QUASI-3D HIGHER-ORDER SHEAR DEFORMATION THEORY 利用准三维高阶剪切变形理论研究承受静载荷的 FGM 圆柱壳夹紧边界上的应力分布
Journal of Science and Technique Pub Date : 2024-04-02 DOI: 10.56651/lqdtu.jst.v19.n01.639
N. D. Tran
{"title":"INVESTIGATING THE STRESS DISTRIBUTION ON THE CLAMPED BOUNDARY OF FGM CYLINDRICAL SHELLS SUBJECTED TO STATIC LOADS USING THE QUASI-3D HIGHER-ORDER SHEAR DEFORMATION THEORY","authors":"N. D. Tran","doi":"10.56651/lqdtu.jst.v19.n01.639","DOIUrl":"https://doi.org/10.56651/lqdtu.jst.v19.n01.639","url":null,"abstract":"This article presents the results of investigating FGM closed cylindrical shells using quasi-3D higher-order shear deformation theory. The law of volume distribution of materials according to the power function. In this article, the results of the analysis of the stress state at the clamped boundary area of the FGM cylindrical shell subjected to radial local loads distributed according to different laws. The mathematical model and the calculation program in Maple are compared and verified with the published results. The article has shown that at the clamped boundary edge, the values of stress components increase sharply, and at the same time, the strong influence of the load parameters (the variation law, the size of the load area), the power-law index on the values and distribution of stress components in the boundary area is demonstrated.","PeriodicalId":509166,"journal":{"name":"Journal of Science and Technique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140753425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DETACHED EDDY SIMULATIONS IN THE STUDY OF AERODYNAMIC CHARACTERISTICS OF THE TURBULENT MIXING LAYER 研究湍流混合层空气动力特性的脱离涡模拟
Journal of Science and Technique Pub Date : 2024-04-02 DOI: 10.56651/lqdtu.jst.v19.n01.719
Trung Dung Nguyen
{"title":"DETACHED EDDY SIMULATIONS IN THE STUDY OF AERODYNAMIC CHARACTERISTICS OF THE TURBULENT MIXING LAYER","authors":"Trung Dung Nguyen","doi":"10.56651/lqdtu.jst.v19.n01.719","DOIUrl":"https://doi.org/10.56651/lqdtu.jst.v19.n01.719","url":null,"abstract":"The turbulent mixing layer is a phenomenon that occurs and has many applications in aeronautical engineering. The study of mixing layer turbulence by the numerical method is suitable under domestic conditions. Two numerical simulation methods are used in most studies including, direct numerical simulation DNS and large eddy simulation LES, while there are very few studies using detached eddy simulation DES. In this article, the authors use numerical simulation methods evolving Reynolds average Navier-Stokes simulation RANS and detached eddy simulation DES to propose a numerical simulation model that allows to study of the aerodynamic characteristics of the turbulent flow interaction. RANS is used to evaluate grid independence. With the selected mesh, two models counting the DES-2D model and the DES-3D model are conducted. Processing velocity field data with Matlab code, the results show that the average flow behavior has closely followed the experimental results, while the turbulent kinetic energy still has a large error. POD and Q-criterion analysis has shown some large coherent structures in the interaction region.","PeriodicalId":509166,"journal":{"name":"Journal of Science and Technique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
POWER QUALITY ENHANCEMENT OF H-BRIDGE INDIRECT OUTPUT VOLTAGE BY CHANGING TIME DISTRIBUTION OF VOLTAGE STATUS 0 AND DIFFERENT 0 通过改变电压状态 0 和不同 0 的时间分布来提高 H 桥间接输出电压的电能质量
Journal of Science and Technique Pub Date : 2024-04-02 DOI: 10.56651/lqdtu.jst.v19.n01.720
Duc Tiep Le
{"title":"POWER QUALITY ENHANCEMENT OF H-BRIDGE INDIRECT OUTPUT VOLTAGE BY CHANGING TIME DISTRIBUTION OF VOLTAGE STATUS 0 AND DIFFERENT 0","authors":"Duc Tiep Le","doi":"10.56651/lqdtu.jst.v19.n01.720","DOIUrl":"https://doi.org/10.56651/lqdtu.jst.v19.n01.720","url":null,"abstract":"This article proposes a plan to improve the quality of the output AC voltage of the H-bridge inverter based on the change of the law of distribution of zero and non-zero voltage states of the inverter when controlling the H-bridge inverter. The results were surveyed, analyzed, compared, and evaluated by simulation model on Matlab-Simulink software. In which the fundamental harmonic level index and the total harmonic distortion (THD) are used to compare, analyze and evaluate the quality of H-bridge inverter output voltages in different switching modes such as pulse width modulation according to sine law (sinPWM), pulse width adjustment (SIR) and the proposed improved pulse width modulation law. The results show that the H-bridge inverter output voltage form with improved sequential switching law gives better quality than the original. This result has practical significance in the research and design of power conversion circuits for AC power transmission systems.","PeriodicalId":509166,"journal":{"name":"Journal of Science and Technique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140753341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DYNAMIC ANALYSIS OF THE HYDRAULIC KNUCKLE BOOM CRANE WHEN LIFTING LOADS OPERATIONS 液压折臂式起重机起重作业时的动态分析
Journal of Science and Technique Pub Date : 2024-04-02 DOI: 10.56651/lqdtu.jst.v19.n01.725
Van Duong Le
{"title":"DYNAMIC ANALYSIS OF THE HYDRAULIC KNUCKLE BOOM CRANE WHEN LIFTING LOADS OPERATIONS","authors":"Van Duong Le","doi":"10.56651/lqdtu.jst.v19.n01.725","DOIUrl":"https://doi.org/10.56651/lqdtu.jst.v19.n01.725","url":null,"abstract":"This article presents the dynamic model of a truck-mounted hydraulic knuckle boom crane when lifting loads operations. The article develops a dynamic model of a hydraulic knuckle boom crane considering the viscoelasticity of the boom-luff cylinder, knuckle cylinder, and extension cylinder. Modeling is constituted for the complex operation of the crane when lifting loads, in which the boom-luff cylinder, knuckle cylinder, and extension cylinder are simultaneously activated. The Lagrange equation of type II is used to build a system of differential equations describing the motion of the mechanical system. On that basis, the article analyzes the dynamic parameters of the crane when lifting loads operations. The results of the article are the basis for the hydraulic knuckle boom crane control problem to improve the performance and reliability of the crane during operation.","PeriodicalId":509166,"journal":{"name":"Journal of Science and Technique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
THE STRESS FIELD OF THE FIRST STAGE COMPRESSOR IMPELLER OF THE TV3-117 GAS TURBINE ENGINE USING NUMERICAL SIMULATION 利用数值模拟研究 TV3-117 燃气涡轮发动机第一级压气机叶轮的应力场
Journal of Science and Technique Pub Date : 2024-04-02 DOI: 10.56651/lqdtu.jst.v19.n01.636
Tien Duong Le
{"title":"THE STRESS FIELD OF THE FIRST STAGE COMPRESSOR IMPELLER OF THE TV3-117 GAS TURBINE ENGINE USING NUMERICAL SIMULATION","authors":"Tien Duong Le","doi":"10.56651/lqdtu.jst.v19.n01.636","DOIUrl":"https://doi.org/10.56651/lqdtu.jst.v19.n01.636","url":null,"abstract":"This article presents the results of stress field calculations for the first stage compressor impeller using the one-way fluid-structure interaction (FSI) method, which helps determine stress concentration zones and safety factors. Numerical analysis conducted with Ansys software reveals that stress concentration occurs near the blade root on the suction side and within the blade lock-disc zone. In these stress concentration zones, such as the blade lock-disc zone and blade suction side, the minimum safety factor is found to be above 2.27. These findings serve as a foundation for future research on impeller stress fields using two-way FSI methods and for providing recommendations to optimize the stress concentration field in the compressor disc.","PeriodicalId":509166,"journal":{"name":"Journal of Science and Technique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140754870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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