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- 저자 : Anjiang (검색결과 4 건)
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A Simplified Analytical Solution for the Necking Semi-empirical Stresses based on Aramis System
Shier Dong,Anjiang Xian,Hazem Samih Mohamed,Yi Chen,Jinghui Yao 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1
To make comparison between classic necking stress solution Bridgman formula and ChenChi formula, the difference of necking surface profile assumptions in these two formulas were discussed theoretically. Then, the uniaxial tension experiment on 16 groups of carbon structural steels Q235 and Q345 were carried out at room temperature. Associate with the necking displacement measured by Aramis optical dynamic 3D strain measurement system, the parameter equation of necking surface profile was determined. The comparison results indicate that ChenChi formula is more accurate than Bridgman formula in calculating the necking stress distribution. Furthermore, to overcome the difficulty of measuring the radius curvature R in these formulas, an empirical formula of the geometric dimensions in the necking section was applied and the parameter was corrected based on the necking strain measured by Aramis system. As a result, the obtained equation in this study can provide an improved calculation method for the analysis of three-dimensional stress in necking and a reference for future research on the necking and ductile fracture of structural steels.
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Solution of ill-posed problems for identification of the dynamic parameters of bolted joints
Ling Li,Anjiang Cai,Tieneng Guo,Xiaoguang Ruan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
The measured frequency response functions (FRFs) are directly used to identify the bolted joint properties. However, the noise effectand the matrix inverse operations create ill-posed problems, and a small noise level may cause the identified result to be faulty. A sensitivitymethod is developed to avoid the ill-posed problems for identification of the dynamic parameters of bolted joints in this paper. Tocalculate the sensitivity of stiffness and damping for bolted joints, the sensitive values are used to determine the frequency ranges beforethe identification. Then, the equivalent stiffness and damping of bolted joints are identified by FRFs method in this range. All results ofsimulation and experiment show that the proposed method can improve significantly the identification accuracy. Additionally, the sensitivitymethod can be used to avoid an ill-posed problem by eliminating ill-posed FRFs in some frequency range before identification.
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Xue-Feng Zhang,Anjiang Cai,Yulong Zhao 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.4
This paper provides a comprehensive study on the zero potential method for restriction of the crosstalk-based measurement error in network resistor arrays. We introduce four circuits with different architectures based on the zero potential method to comparatively study the effect of the switches on-resistance on the measurement error. Moreover, the effect of the operational amplifiers with different specifications on the measurement error will be investigated. The results show that the measurement error introduced by the onresistance of the switches can be effectively suppressed by inserting a buffer between the sensing elements and the switches on each driven electrode, and utilizing the virtual ground of the trans-impedance amplifier on each scanned electrode. We will show that, the efficiency of the circuits on elimination of the measurement error may be improved by employing high precision operational amplifiers.
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A modified elastic contact stiffness model considering the deformation of bulk substrate
Ling Li,Jingjing Wang,Xiyong Pei,Wei Chu,Anjiang Cai 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.2
Establishing an accurate and effective stiffness model of the elastic contact surface is the basis for further modeling and analysis of machine tool dynamics. In this paper, a new elastic contact stiffness model is proposed that considers the bulk substrate deformation and modifies the Greenwood and Williamson microcontact model (GW model) of rough surfaces. Based on the Hertz contact theory and fixed-point iteration method, a single asperity contact model is created to analyze the effects of bulk substrate deformation and coating materials. To make the contact stiffness model more accurate and effective, two aspects are improved: One is to introduce the triangular distribution function to make the asperity heights distribution more consistent with the actual machined surface, and the other is to correct the defects in the micro-contact process. Comparing the finite element simulation results with the modal test data, the correctness of the proposed contact stiffness model is verified. The simulation results reveal the influence of distribution function, surface roughness and coating material on the contact characteristics of the joint surface.
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