Chongqing, China

The Logistical Engineering University of PLA or University of Logistics is an institution of higher learning located in Chongqing, focusing on military engineering. It is affiliated to the General Logistics Department of the People's Liberation Army of China, and is one of the leading military engineering academies in the country.The university was founded in 1961, and was named a national key university in 1979. Wikipedia.

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Zheng Y.,PLA Logistical Engineering University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

Solid material develops from elastic to plastic then to failure after undertaking some load, which means that yield is different from failure. The system of yield criteria for geomaterial is discussed and two definitions which are point failure and surface failure in stress field are put forward. And the criteria of surface whole failure is defined through traditional limit analysis method. Simultaneously, the deficiencies for traditional limit analysis and numerical analysis are pointed out by reviewing and analyzing the solution characteristics of traditional limit analysis method. Based on the combination of these two methods, a newly developed numerical limit analysis method is built, which has enlarged the application rage of limit analysis. The significances and features of traditional limit analysis method and numerical limit method are studied, as well as the reliabilities. The advantages and disadvantages of numerical limit analysis are listed; and the wide applicability of numerical limit analysis in the slope(landslide) engineering, foundation engineering and tunnel engineering is illustrated.

Kong L.,CAS Wuhan Institute of Rock and Soil Mechanics | Chen Z.,PLA Logistical Engineering University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2012

A brief introduction is provided on the overall trend of the global-wide research on special soils and slopes with a particular emphasis on the state of the practice in China on basic properties and engineering countermeasures for typical special soils such as collapsible loess, expansive soil and red clay. Recent achievements are pointed out as well as the major remaining problems in the field of special soils and slopes. The future research direction is also identified and a long list of relevant references is provided in the end of the paper.

Yuan X.-H.,Hubei Engineering University | Chen W.,Wuhan University of Technology | Lu Z.-A.,Hubei Engineering University | Chen H.,PLA Logistical Engineering University
Construction and Building Materials | Year: 2014

The shrinkage compensating of alkali activated slag (AAS) concrete with an expanding admixture (EA) composed of anhydrite and quick lime as the expanding source is investigated. The effects of the expanding admixture on the compressive strength and volumetric change of the AAS concrete are tested, followed by microstructural analysis of the hardened AAS pastes. The test results have shown that the EA is effective for compensating the shrinkage of AAS concrete. Ettringite is not formed in the AAS paste. Formation of the calcium hydroxide in the AAS paste is the main expanding source. Adding EA into the AAS concrete can increase its early age compressive strength, but lowers slightly the late age compressive strength. © 2014 Elsevier Inc. All rights reserved.

Li H.,University of Missouri-St. Louis | Jiang D.,PLA Logistical Engineering University
Computers and Operations Research | Year: 2012

We model the safety stock placement problem in general acyclic supply chain networks as a project scheduling problem, for which the constraint programming (CP) techniques are both effective and efficient in finding high quality solutions. We further integrate CP with a genetic algorithm (GA), which improves the CP solution quality significantly. The performance of our hybrid CPGA algorithm is evaluated on randomly generated test instances. CPGA is able to find optimal solutions to small problems in fractions of a second, and near optimal solutions of about 5% optimality gap to medium size problems in several minutes on average. © 2011 Elsevier Ltd. All rights reserved.

Guan L.,PLA Logistical Engineering University | Feng X.L.,PLA Logistical Engineering University | Xiong G.,PLA Logistical Engineering University | Xie J.A.,PLA Logistical Engineering University
Sensors and Actuators, A: Physical | Year: 2011

In this paper, Dielectric Spectroscopy (DS) was employed to analyze the oxidation degradation process of engine lubricating oil qualitatively and quantitatively compared with Fourier Transform Infrared Spectroscopy (FTIR). It was found that both DS and FTIR can directly obtain the degradation features from the spectral data. With the combination of DS and multivariate calibration (Partial Least Square PLS), three main oil monitoring properties including Oxidation Duration (OD), Total Acid Number (TAN) and Insoluble Content (IC) can be determined quantitatively and accurately. It was proved that operating temperature had more influence on DS data than excitation amplitude. The results in the article show that DS can be developed into an effective oil monitoring/analysis method. © 2011 Elsevier B.V. All rights reserved.

Li F.,University of Sichuan | Zhou J.,University of Sichuan | Wu D.,PLA Logistical Engineering University
Aerospace Science and Technology | Year: 2013

This paper addresses the optimal filtering problem for a class of uncertain dynamical systems with multiple packet dropouts and finite-step correlated observation noises. By rearranging the stochastic terms in the transmission and measurement matrices of the dynamical system into the noises directly, the process noises and observation noises in resulted system depend on the state as well as the stochastic uncertain perturbations, and are not only autocorrelated respectively but also cross-correlated. For this complicated dynamical system, instead of designing a Kalman-type filter, a globally optimal filtering in the minimum mean square error sense is developed by exploiting sufficiently the statistical properties of correlated noises. Numerical simulation is provided to demonstrate the performance of the proposed filter. © 2011 Elsevier Masson SAS.

Dong T.-W.,PLA Logistical Engineering University | Zheng Y.-R.,PLA Logistical Engineering University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

Using method of strength reduction (SRM) is studied for pile foundation, and the safety storage factor (F) that is different from the over-loading safety factor by increment loading method (ILM) is advised, and the estimated condition of limit analysis is put up for the strength reduction method, (1) the inflexion lies on F-s curve, and the bottom of F-s curve is parallel to the s axis; (2) The turning point of V type appear on F-Q u curve, so the previous reduction factor of the inflexion of F-s curve and the turning point of V type of F-Q u curve is the safety storage factor on the loading condition of pile head. The results of pile foundation on the base of limit analysis show that the inflexion of F-s curve and the turning point of V type of F-Q u curve of strength reduction method have the specific physic purport, the errors that SRM to the static loading test and ILM are less 10%, and this method has certain mean for estimating the ultimately loading in practical engineering.

Xu Y.,PLA Logistical Engineering University
International Journal of Simulation: Systems, Science and Technology | Year: 2016

In this paper, the author studies logistics distribution technology based on Internet of things. The traditional logistics information system cannot achieve the delivery accuracy. Sometimes proposed cargo is accurate, but to the guest’s hand goods may be wrong. The system development based on the platform of logistics information achieves the accurate results with good information aided by bar code scanning technology. It is very weak for the car temperature and humidity monitoring of the traditional logistics information system. The result shows that the performance of traditional logistic can be improved by using Internet of Things. © 2016, UK Simulation Society. All rights reserved.

Shen T.-A.,PLA Logistical Engineering University | Tu Y.-Q.,PLA Logistical Engineering University | Zhang H.-T.,PLA Logistical Engineering University
Review of Scientific Instruments | Year: 2014

The precision of frequency tracking method and phase difference calculation method affects the measurement precision of Coriolis Mass Flowmeter directly. To improve the accuracy of the mass flowrate, a novel signal processing method for Coriolis Mass Flowmeter is proposed for this time varying signal, which is comprised of a modified adaptive lattice notch filter and a revised sliding recursive discrete-time Fourier transform algorithm. The method cannot only track the change of frequency continuously, but also ensure the calculation accuracy when measuring phase difference. The computational load of the proposed method is small with higher accuracy. Simulation and experiment results show that the proposed method is effective. © 2014 AIP Publishing LLC.

Chen Z.-H.,PLA Logistical Engineering University | Qin B.,PLA Logistical Engineering University
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

Based on thermodynamics and stress theory of continuum mechanics, a series of stress state variables of unsaturated soils, which covered all stress state variables used in literature, are deduced from the equilibrium equation of soil skeleton. It is shown that there are more than five combinations of stress state variables for unsaturated soils, most of which are related to physical properties such as void ratio and degree of saturation. Stress state variables should have dimensions of stress, while void ratio, degree of saturation and their combination could not be regarded as stress state variables. Both the simplified Bishop's effective stress equation and the Fredlund's two stress state variables are simplified forms of stress state variables. The influence of void ratio is not included in the simplified Bishop's effective stress equation, while the dependence on void ratio and degree of saturation are neglected in the Fredlund's two stress state variables. When choosing stress state variables for unsaturated soils, rationality in theory and convenience in application as well as correctness in logic should be taken into account.

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