http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Shyh-Chour Huang,Thanh-Phong Dao 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.8
This paper presents the mechanical design and computational optimization for a flexure-based XY positioning platform that is capable of performing planar translational motion with two degrees of freedom in the-x and-y axes. During the mechanical design, the hybrid leaf spring and right circular hinges are adopted to increase the travel displacement and reduce the cross-axis coupling errors. These hybrid joints create the parallelogram structures which provide the functions of joint and transmission mechanisms with excellent decoupling properties. The statistics and dynamics of the mechanism are analyzed, and these analyses are validated with FEA and experimental results. A finite element analysis-based response surface methodology is utilized to solve the multi-objective optimization problems and thus the static and dynamic characteristics of the positioning platform are improved. The prototype is fabricated using a wire electric discharge machining technique. The experimentations are carried out to investigate the performance of the platform and verify the established performance characteristics and optimization methodologies. The experimental results reveal that the platform has a broad workspace range in excess of 125 μm × 125 μm with a first-order natural frequency of 740 Hz. The cross-axis coupling ratio is less than 0.6% verifying the excellent decoupling property.
A novel bio-inspired hierarchical tetrachiral structure that enhances energy absorption capacity
Duy Binh Pham,Shyh-Chour Huang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
This study proposes a novel hierarchical tetrachiral structure inspired by the shell structure of nautilus animals. The parameters of unit cells were designed in compliance with the dimensions of the universal testing machine and the 3D printer. A model made up of 5×5 unit cells of the novel structure was designed and simulated in SolidWorks and ABAQUS software, respectively. To verify the accuracy of the simulated result, the fused deposition modeling 3D-printing technique was adopted to fabricate both traditional and novel structures with acrylonitrile butadiene styrene material and then the quasi-static compression test was conducted. Additionally, the influence of relative density and strain rate on the performance of the structures also was investigated in this study. The findings showed that the novel structure possesses higher energy absorption than the traditional structure. Furthermore, strain rate and relative density have a significant effect on the performance of the structure. Finally, the proposed novel structure can be used in energy-absorbing, impact-resistant devices.
Compliant thin-walled joint based on zygoptera nonlinear geometry
Thanh-Phong Dao,Shyh-Chour Huang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.3
This paper introduces a Compliant thin-walled joint (CTWJ) that expands the group of existing compliant joints. The CTWJ design is based on the nonlinear geometry of the zygoptera animal. With a thin-walled structure, the CTWJ allows a considerably large range of motion in the x-and-y axes. In addition, the thin-walled structure is then filled by polydimethylsiloxane material to reinforce the stiffness of the CTWJ. First, design of experiment methodology is used for the sensitive analysis of the width and the thickness to the strain of joint. The range of motion, the strain, the buckling behavior, and the first natural frequency of CTWJ are investigated via finite element analysis and experiments. The behavior of the CTWJ is subsequently compared with the conventional compliant joints to realize the efficient performance of the CTWJ. The results revealed that the CTWJ has a range of motion and strain energy larger than those of traditional compliant joints. Finally, an example of vibration isolator is modeled by using the CTWJ as planar spring. It is believed that the CTWJ has a great potential for the development of compliant mechanisms in terms of large range of motions in mutliple axes.
Thanh-Phong Dao,Shyh-Chour Huang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
A flexible bearing with compliant mechanisms for high-precision mechanism applications has been established as an efficient structure. We have attempted to realize a novel robust design of a flexible bearing with one degree of freedom (1-DOF) translation for highprecisionmechanisms. First, the relationship between five design variables and the stress of the displacement responses is illustratedusing the response surface method. Next, the Taguchi method, combined with a utility concept, is adopted to determine the optimal parametercombination to minimize stress while simultaneously maximizing displacement. An orthogonal array L27 is used in the experimentalwork. The experimental results show that displacement and stress values measured 0.11332 mm and 37.625 MPa, respectively. The confirmation results fall within 95% of the CICE. The proposed methodology is useful for the robust design of flexible bearings andrelated mechanisms.
Quang Dich Nguyen,Van Nam Giap,Shyh-Chour Huang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.11
This paper proposes a new stability condition for a fractional order calculus (FOC)-based for the disturbance observer (DO) and sliding mode control (SMC) of a secure communication system (SCS). First, the mathematics of the chaotic system was remodeled into the Takagi-Sugeno fuzzy (TSF) with the aim of softening the calculation of control design and stability analysis. Second, the synchronization of two nonidentical chaotic systems was adopted by using a newly proposed Lyapunov-based stability condition. Third, a new disturbance observer was proposed based on the suggested stability condition together with the inversed model-based concept. To show the correction of the proposed method, the stability analysis was adopted to obtain the goal. Finally, the simulation by using MATLAB software was used to conduct the effectiveness of the proposed methods. The achievements are small tracking errors, stable steady-states, and all tested disturbances and uncertainties were mostly rejected.
Kao, Yung-Chou,Nguyen, Nhu-Tung,Chen, Mau-Sheng,Huang, Shyh-Chour Society for Computational Design and Engineering 2015 Journal of computational design and engineering Vol.2 No.4
In this paper, the cutting force calculation of ball-end mill processing was modeled mathematically. All derivations of cutting forces were directly based on the tangential, radial, and axial cutting force components. In the developed mathematical model of cutting forces, the relationship of average cutting force and the feed per flute was characterized as a linear function. The cutting force coefficient model was formulated by a function of average cutting force and other parameters such as cutter geometry, cutting conditions, and so on. An experimental method was proposed based on the stable milling condition to estimate the cutting force coefficients for ball-end mill. This method could be applied for each pair of tool and workpiece. The developed cutting force model has been successfully verified experimentally with very promising results.