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Li Li,Xingfei Li,Ke Kou,Tengfei Wu 한국광학회 2015 Current Optics and Photonics Vol.19 No.1
To accurately extract absolute distance information from a self-mixing interferometry (SMI) signal, inthis paper we propose an approach based on a particle swarm optimization (PSO) algorithm instead offrequency estimation for absolute distance. The algorithm is utilized to search for the global minimumof the fitness function that is established from the self-mixing signal to find out the actual distance. Aresolution superior to 25 μm in the range from 3 to 20 cm is obtained by experimental measurement,and the results demonstrate the superiority of the proposed approach in comparison with interpolated FFT. The influence of different external feedback strength parameters and different inertia weights in thealgorithm is discussed as well
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Kinematic Path Analysis of Kinematically Indeterminate Systems
Xingfei Yuan,Along Li,Yanbin Shen,Ruojun Qian 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
Kinematically indeterminate systems are geometrically unstable. Considering that there is only tiny elastic deformation in the process of the mechanism motion, the method to simulate kinematic paths of kinematically indeterminate systems without considering elastic deformation is studied in this paper. Based on the equilibrium matrix theory, mechanism displacement is decomposed into combinatorial displacement of independent inextensional mechanisms and displacement resulted from the length modifications of members. The reasonable combination coefficient of inextensional mechanisms is determined by the gradient of the potential energy. An analysis algorithm is developed to simulate the kinematic paths of rigid pin-bar assemblies. The validity and accuracy of the algorithm proposed in this paper is illustrated by three typical examples.
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Weixiao Tuo,Xingfei Li,Yue Ji,Tengfei Wu,Ziming Xie 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.5
In this paper, an analytical compliance model for right circle fl exure hinge (RCFH) is presented with the stress concentrationin consideration. The stress concentration caused by changes in RCFH’s cross-section usually happens at the weakestpoint. It has been shown to seriously aff ect RCFH’s compliance calculation. Based on the virtual work theory, superpositionrelationship of the deformation, as well as Castigliano’s second theorem, RCFH’s analytical compliance model consideringthe stress concentration eff ect is established. The model is calculated as a series of closed-form equations which are relatedwith geometric dimensions and employed material. Complicated defi nite integrals existing in these compliance equations areproved to be correctly calculated through comparisons with other literatures. Finally, in order to examine the validity of theestablished model, fi nite element analysis (FEA) is conducted. The relative errors between the theoretical values obtainedby the established model and FEA results are found within 20% for a wide range of geometric dimensions.
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