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Vietnam Journal of Mechanics最新文献

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A novel criterion for crack detection in beam structures by frequency response functions 基于频率响应函数的梁结构裂纹检测新准则
Vietnam Journal of Mechanics Pub Date : 2023-09-30 DOI: 10.15625/0866-7136/19040
Nguyen Tien Khiem, Tran Thanh Hai, Le Khanh Toan, Nguyen Thi Lan, Ho Quang Quyet
{"title":"A novel criterion for crack detection in beam structures by frequency response functions","authors":"Nguyen Tien Khiem, Tran Thanh Hai, Le Khanh Toan, Nguyen Thi Lan, Ho Quang Quyet","doi":"10.15625/0866-7136/19040","DOIUrl":"https://doi.org/10.15625/0866-7136/19040","url":null,"abstract":"The frequency response function (FRF) is a fruitful attribute that includes almost all dynamical characteristics of a structure such as natural frequencies and modes, damping coefficients, or resonance and antiresonance conceptions. However, the complex feature of FRF has not been thoroughly employed for structural damage detection. In the present study, a novel indicator extracted from FRFs of beam structures is developed for crack identification. The damage indicator originated from the well-known mode assurance criterion (MAC) and therefore it is termed spectral assurance criterion (SAC). First, a coherence coefficient calculated from FRFs of intact and damaged beams and called herein spectral damage index (SDI) is analyzed for examining sensitivity of FRFs to crack. Then, SAC calculated for different FRFs of the same damaged structure is employed for crack detection by the so-called contour method. Results obtained in numerical examples of the crack detection problem show that SAC is really a novel and efficient criterion for crack identification in beams from measured FRFs.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136343255","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 stability study of stiffened functionally graded composite plates reinforced by carbon nanotubes using finite element method 碳纳米管增强功能梯度加筋复合材料板静稳定性的有限元研究
Vietnam Journal of Mechanics Pub Date : 2023-09-30 DOI: 10.15625/0866-7136/18862
Nguyen Thai Chung, Duong Thi Ngoc Thu
{"title":"Static stability study of stiffened functionally graded composite plates reinforced by carbon nanotubes using finite element method","authors":"Nguyen Thai Chung, Duong Thi Ngoc Thu","doi":"10.15625/0866-7136/18862","DOIUrl":"https://doi.org/10.15625/0866-7136/18862","url":null,"abstract":"This paper presents some results on the linear stability research of Stiffened Functionally Graded Carbon NanoTube-Reinforced Composite (SFG-CNTRC) plates under static in-plane loads by the Finite Element Method (FEM) and a new four-variable refined plate theory. The governing equations for the static buckling of the system are obtained by the new four-variable refined plate theory and FEM. The eigenvalue problem method was used to solve the equation to determine the critical force of the plates. A numerical example is compared with the results in another research to check the validity of the present algorithm. The influences of some factors such as plate theory, CNT distribution along the layer thickness, stiffener height ratio, and fiber orientation angle on the critical buckling loads and unstable regions are discussed.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136343248","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
Design, modeling, and experimental evaluation of a self-sealing component for rotary shafts in magneto-rheological fluid devices 磁流变流体装置旋转轴自密封元件的设计、建模和实验评估
Vietnam Journal of Mechanics Pub Date : 2023-09-30 DOI: 10.15625/0866-7136/19024
Vo Van Cuong, Quoc Hung Nguyen, Le Hai Zy Zy, Ngoc Diep Nguyen, Le Duy Tuan, Do Huu Minh Hieu, Do Quy Duyen
{"title":"Design, modeling, and experimental evaluation of a self-sealing component for rotary shafts in magneto-rheological fluid devices","authors":"Vo Van Cuong, Quoc Hung Nguyen, Le Hai Zy Zy, Ngoc Diep Nguyen, Le Duy Tuan, Do Huu Minh Hieu, Do Quy Duyen","doi":"10.15625/0866-7136/19024","DOIUrl":"https://doi.org/10.15625/0866-7136/19024","url":null,"abstract":"This study focuses on the development and evaluation of a self-sealing component for rotary shafts in Magneto-rheological (MR) fluid-based devices, such as MR brakes and MR clutches. The proposed sealing component, which replaces traditional lip-seals, consists of a permanent magnet and a magnetic core positioned on the rotary shaft. Through a combination of simulation and experimentation, the design and performance of the self-sealing component are investigated. Initially, the research provides an overview of MR fluid and its applications, as well as previous studies on sealing components utilizing MR fluid. Building on this background, a configuration for the self-sealing component specific to rotary shafts in MR fluid-based devices is proposed. The design and modeling of the sealing component are carried out, employing the Bingham plastic rheological model of the MR fluid and finite element analysis techniques. Through finite element analysis, an optimal design for the sealing component is determined. Prototypes of the sealing component are manufactured, and experimental testing is conducted to assess its performance characteristics. The experimental results are then compared with the simulated results, allowing for a comprehensive evaluation of the sealing component's effectiveness.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136344872","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
A polygonal finite element method for shakedown analysis of structures 结构安定分析的多边形有限元法
Vietnam Journal of Mechanics Pub Date : 2023-09-30 DOI: 10.15625/0866-7136/19027
Phuc L. H. Ho, Canh V. Le, Phuong H. Nguyen, Dung T. Tran
{"title":"A polygonal finite element method for shakedown analysis of structures","authors":"Phuc L. H. Ho, Canh V. Le, Phuong H. Nguyen, Dung T. Tran","doi":"10.15625/0866-7136/19027","DOIUrl":"https://doi.org/10.15625/0866-7136/19027","url":null,"abstract":"This study presents an innovative numerical method that combines the polygonal finite element method (Poly-FEM) with conic optimization techniques within the framework of structural shakedown analysis. The resulting optimization problem is formulated as a second-order cone programming (SOCP) problem and is efficiently solved using the MOSEK primal-dual interior-point solver. Numerical experiments validate the computational efficiency and efficacy of the proposed approach.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136343250","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
Proportional Topology Optimization algorithm for two-scale concurrent design of lattice structures 栅格结构双尺度并行设计的比例拓扑优化算法
Vietnam Journal of Mechanics Pub Date : 2023-06-30 DOI: 10.15625/0866-7136/18368
M. Nguyen, D. Vo, T. Bui
{"title":"Proportional Topology Optimization algorithm for two-scale concurrent design of lattice structures","authors":"M. Nguyen, D. Vo, T. Bui","doi":"10.15625/0866-7136/18368","DOIUrl":"https://doi.org/10.15625/0866-7136/18368","url":null,"abstract":"In this paper, the Proportional Topology Optimization (PTO) algorithm is extended for the two-scale concurrent topology optimization, in which both the structure and material cellular micro-structure are subject to design. PTO was originally developed on the concept that the amount of material being distributed to an element would be proportional to the contribution of that element in the objective function. Sensitivity analysis is not required. In a two-scale concurrent topology optimization problem, two sets of design variables are defined, one for macro-structure and one for micro-structure. Here, the objective function is reformulated such that the contribution of each micro-scale design variable can be determined, facilitating the employment of PTO. The macroscopic effective elastic tensor is evaluated by the energy-based homogenization method (EBHM), providing a link between micro-structure and macro-structure. Feasibility and efficiency of the proposed PTO approach are demonstrated via several benchmark examples of both two and three dimensional structures.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132898613","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: 1
A single degree of freedom model for cracked beam 裂纹梁的单自由度模型
Vietnam Journal of Mechanics Pub Date : 2023-06-30 DOI: 10.15625/0866-7136/18464
Tran Thanh Hai, Do Nam
{"title":"A single degree of freedom model for cracked beam","authors":"Tran Thanh Hai, Do Nam","doi":"10.15625/0866-7136/18464","DOIUrl":"https://doi.org/10.15625/0866-7136/18464","url":null,"abstract":"This paper presents a simplified model of cracked beam by single-degree-of-freedom system. Equivalence between the beam and SDOF models means that they have the same fundamental natural frequency and similar frequency response functions (FRFs). Similarity of FRFs is checked by using the frequency-domain assurance criterion acknowledged herein as spectral similarity index (SSI). Finally, FRFs of both the cracked beam and its simplified SDOF model have been examined versus crack location and depth using the so-called spectral damage index (SDI). Numerical results show that SDI is significantly sensitive to crack and could be used as a novel indicator for crack detection in beam by measurements of frequency response functions.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128142616","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
On the trade-off performance curve of vibration isolation controlled by passive or adaptive dampings 被动与自适应阻尼控制隔振的权衡性能曲线
Vietnam Journal of Mechanics Pub Date : 2023-06-30 DOI: 10.15625/0866-7136/18148
L. D. Viet
{"title":"On the trade-off performance curve of vibration isolation controlled by passive or adaptive dampings","authors":"L. D. Viet","doi":"10.15625/0866-7136/18148","DOIUrl":"https://doi.org/10.15625/0866-7136/18148","url":null,"abstract":"This paper addresses an on-off adaptive damping isolation, in which the damping can be frequency dependent. The comparison with the passive isolation is illustrated by the trade off performance curve, which is shown the relation between the displacement and force transmissibility. The adaptive control is based on on-off dampings and a switching frequency. The analytical optimization of the adaptive damping law can be obtained. The optimized adaptive damping control showed a remarkable improvement comparing with the passive one. At last, a self-made magnetorheological fluid is introduced to show the capability to provide the variable damping.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121450827","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
Numerical simulation of springback and twisting of stamped thin U-shaped copper alloy sheets with a change of the blank alignment u型铜合金冲压薄板在改变坯料对中方向时回弹和扭转的数值模拟
Vietnam Journal of Mechanics Pub Date : 2023-06-30 DOI: 10.15625/0866-7136/17662
G. Ha
{"title":"Numerical simulation of springback and twisting of stamped thin U-shaped copper alloy sheets with a change of the blank alignment","authors":"G. Ha","doi":"10.15625/0866-7136/17662","DOIUrl":"https://doi.org/10.15625/0866-7136/17662","url":null,"abstract":"An experimental database of springback and twisting of U-shaped elongated structures is available from a previous study. The materials are copper alloys: pure Cu, CuBe2, and CuFe2P, provided in thin sheets of thickness around 0.1 mm. After deep-drawing of rectangular blanks, which can be aligned with the tools or slightly misaligned, and tool withdrawal, the U-shaped structure exhibits an opening of the section (2D springback) and twisting (3D springback). Characteristic features of the deformed geometry are significantly different for the three alloys. This study is directed to understand the origin of that difference with a numerical simulation of the process. The mechanical behaviour of the materials was investigated in tension and hydraulic bulge test, out of comparison’s sake and to derive the hardening law over a strain range representative of the process. Finite element simulations are performed using the von Mises criterion coupled with isotropic hardening, to compare the predicted forming load and springback parameters with experimental values.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122657169","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
An error compensation controller for milling robots 铣削机器人误差补偿控制器
Vietnam Journal of Mechanics Pub Date : 2023-06-29 DOI: 10.15625/0866-7136/16979
P. Khoi, Ha Thanh Hai, Tran Minh Thuy
{"title":"An error compensation controller for milling robots","authors":"P. Khoi, Ha Thanh Hai, Tran Minh Thuy","doi":"10.15625/0866-7136/16979","DOIUrl":"https://doi.org/10.15625/0866-7136/16979","url":null,"abstract":"This paper presents a method of controlling a serial robot for milling by an inverse kinematic controller combined with an outer PD loop (Inverse Dynamics + PD controller), with calibration and compensation of errors in calculating the cutting forces. Because the cutting forces are generated at the time of cutting, at the contact area between the workpiece and the cutting tool, the generalized forces of the cutting forces in the differential equations of motion of robot is always variable and difficult to determine precisely. The cutting forces depend on the cutting mode, the geometric parameters of the cutting layer, the cutting conditions, etc. This study shows an inverse dynamic controller with the outer PD loop and an additional calibration block to compensate the differences between the actual cutting forces and calculated cutting forces (which are caculated by the empirical formula). The cutting forces at each machining time of the calibration block is determined based on the differential equation of motion. The efficiency (convergence time and accuracy) of the proposed controller is evaluated by comparison between the numerical simulation results of the controller with cutting force calibration and the conventional PD controller. In the conventional PD controller, the dynamic model of the robot is assumed to define precisely. The results contribute to design and manufacture the controllers for robotic milling, and to improve the quality of the machined surface. \u0000 ","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114879097","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
Free vibration analysis of FGM framed nanostructures using variational-consistent boundary conditions 基于变分一致边界条件的FGM框架纳米结构自由振动分析
Vietnam Journal of Mechanics Pub Date : 2023-06-14 DOI: 10.15625/0866-7136/18192
Duong The Hung, T. Lien, T. Dinh, N. Thắng
{"title":"Free vibration analysis of FGM framed nanostructures using variational-consistent boundary conditions","authors":"Duong The Hung, T. Lien, T. Dinh, N. Thắng","doi":"10.15625/0866-7136/18192","DOIUrl":"https://doi.org/10.15625/0866-7136/18192","url":null,"abstract":"This paper analyses free vibrations of framed nanostructures made of Functionally Graded Material (FGM) based on the Nonlocal Elastic Theory (NET) and the Dynamic Stiffness Method (DSM). FGM characteristics vary nonlinearly throughout the height of the beam element. The NET considers the nonlocal parameter that perfectly captured the size effect of nanostructures. However, the NET makes nonlocal paradoxes in the bending and vibration behaviour of framed nanostructures with the free ends. To overcome these phenomena, the nanostructure is modelled according to the Euler–Bernoulli beam theory and the variational-consistent nonlocal boundary conditions have been derived. The exact solutions of differential equations of motion and variational-consistent nonlocal boundary conditions are found using the DSM. The influences of the nonlocal, material, geometry parameters and Pasternak’s foundation on the free vibration are then analyzed. It is shown that the study can be applied to other FGMs as well as more complicated framed structures.","PeriodicalId":239329,"journal":{"name":"Vietnam Journal of Mechanics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123768451","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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