Liu Q.,Aalto University |
Liu Q.,Guangxi University of Technology
Journal of Engineering Mechanics | Year: 2012
This paper describes a numerical method for calculation of the sensitivity and Hessian matrix of the response evolutionary power spectral density (PSD) functions of structures subjected to uniformly modulated evolutionary random seismic excitation. The method is formulated based on the pseudoexcitation method and the Gauss precise time step integration method. The evolutionary nonstationary random response analysis is converted into step-by-step integration computations using the pseudoexcitation method. The formulas of the pseudoresponses and their first and second derivatives with respect to the structural design variables are derived based on the Gauss precise time step integration method. The evolutionary PSD functions, their sensitivity, and the Hessian matrix are calculated using the pseudoresponses and their first and second derivatives, respectively. Finally, the evolutionary PSD functions' sensitivity and Hessian matrix analysis of a three-story, two-bay planar frame subjected to uniformly modulated evolutionary random earthquake ground motion has been studied to elucidate the proposed method. © 2012 American Society of Civil Engineers.
Wang Z.-M.,Huaihai Institute of Technology |
Yu X.,Guangxi University of Technology |
Yu X.,Beijing Institute of Technology
Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability | Year: 2013
Two non-homogeneous Poisson processes including the power law process and the log-linear process with reliability improvement or deterioration are analyzed. Based on Akaike information criterion and Bayesian information criterion, the best model of failure data is presented. The point maximum likelihood and interval estimators of the parameters, as well as seven reliability indices of the log-linear process model, such as cumulative mean time between failures, cumulative number of failures, reliability at a given time, and warranty time given reliability are given. In tests for failure time trends, both the graphical methods, including the cumulative failures versus time plot and the total-time-on-test plot, and the analytical methods including the Laplace, the Military Handbook, and the Lewis-Robinson tests are used. Three real cases for failure data with failure truncation and time truncation of multiple numerically controlled machine tools are given to illustrate the use of the proposed models. © 2012 IMechE.
Jiang L.-Y.,Guangxi University of Technology
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2010
According to the Randomized Circle Detection (RCD) algorithm, the circle parameters needed to be calculated four times for each four points sampled randomly. A fast randomized algorithm for detecting circles was presented. If the distance between one point and the boundary of the circle determined by the other three points was bigger than a certain threshold in the process of judging whether the four points could determine a candidate circle, the randomized sampling and computation should be carried on again. The proposed algorithm largely decreased the calculation times of circle parameters by the new threshold. It affirmed the candidate circle for true circle to apply a quick evidence-collecting process. Some synthetic images with different levels of noises and real images were taken to test the performance. Experimental results demonstrate that the proposed algorithm can detect circles more quickly than RCD, and has a strong robustness.
Guo Y.,Guangxi University of Technology
Procedia Engineering | Year: 2011
In order to provide the accurate SOC values of super capacitor for the vehicle control strategy of hybrid electric vehicle which is using the super capacitor, this paper completes the hardware and software design of super capacitor monitoring and control system, gives out the block diagram of the system, the hardware block diagram and the software flow diagram, achieved the measurement of the voltage, current and temperature; analysis the linear relationship between the open circuit voltage and the discharge depth of super capacitor, optimize the SOC estimation method of used the capacitor voltage state. The experimental results show that the voltage detection and the SOC estimated accuracy of the monitoring system better meet the testing requirements. © 2011 Published by Elsevier Ltd.
Wen F.,Guangxi Institute of Botany |
Qin G.-L.,Hechi University |
Wei Y.-G.,Guangxi Institute of Botany |
Liang G.-Y.,Guangxi Institute of Botany |
Gao B.,Guangxi University of Technology
Phytotaxa | Year: 2012
Primulina hochiensis var. rosulata, a new endemic variety from Guangxi, China, is described and illustrated. It is similar to P. hochiensis sensu stricto, but differs in lacking stolons, the different indumentum of peduncle, corolla, filament and anthers, leaf blades elliptical to slightly ovate, calyx purple, corolla white or pink, filaments geniculate close to the base, staminodes 3, and stigmas translucent to white, obtrapeziform, 2-lobed. © 2012 Magnolia Press.