Shan Z.,Jilin University |
Shi Y.,Jilin University |
Zhu L.,Changchun Architecture and Civil Engineering College
International Journal of Reasoning-based Intelligent Systems | Year: 2015
In this paper, a fractional order PID control scheme is proposed for the water filling and drainage system of a rubber dam, which is a typical nonlinear, time-varying, variable structure system. First, mathematical model of the system of filling and draining off water of the rubber dam was established; theoretically proved that the fractional order controller has good robust properties for the variable structure system; and then in a practical project, a fractional order PID controller is designed for the constant current control of filling and draining off water from the rubber dam, and achieved good control effect. Lastly, this paper gives the actual control curve of constant current using the fractional order PID controller. Practice proves that the proposed control scheme is efficient and the system possesses good static, dynamic performance and certain robustness. © 2015 Inderscience Enterprises Ltd.
Zhang L.,Changchun Architecture and Civil Engineering College
Applied Mechanics and Materials | Year: 2013
This paper discusses the feasibility of damage identification on simply supported slab bridge by the curvature mode. Firstly, the theoretical basis of curvature modal method for damage identification is introduced. Then, it simulated the structural damages by the use of three-dimensional finite element model, and used curvature mode to identification them validly. Based on the finite element simulation results, the following conclusions can be drawn: the decline of the structural natural frequency can be used to judge if the simply supported slab bridge is damaged. But the declined value is small, it is almost impossible to achieve in the scene, and it also can not be accurately positioning and quantitative; curvature model is very sensitive to the partly change of structure. It cannot be affected by the interference of the other plates, when the damage condition was identified on one plate of the simply-supported slab bridge even if that plate is adjacent plate would not affect it. © (2013) Trans Tech Publications, Switzerland.
Zheng Y.,Changchun Architecture and Civil Engineering College
Advanced Materials Research | Year: 2014
Based on test data of the prestressed anchor cable composite soil nailing wall deformation and internal force of structure of Shenzhen Holiday Plaza foundation pit, the numerical simulation model of foundation pit is established by FLAC3D software. Through the reasonable selection of soil constitutive model and structural unit, the numerical simulation model is consistent with the project practice. The simulation results on horizontal displacement of foundation pit, the internal force of the structure, the surface layer stress and damaged form are reasonable. This does not only provide a strong basis for the optimum design of the foundation pit, but also provide a scientific guidance for engineering application. © (2014) Trans Tech Publications, Switzerland.
Zhao Y.-Q.,Changchun Architecture and Civil Engineering College
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2013
The area of a cross section was divided into finite stiffness units(the product of the elasticity modulus and area units), from this to determined the location of its weighted centroid and neutral axis of the cross-section for the reinforced concrete beam. According to the deformation characteristics of the tiny section of beam, strain law and stress law of every stiffness units of the cross-section were obtained. The static relation determined the stress law. The stress of every stiffness units was calculated for the steel bars or concrete. When the steel bar yielded, the "same effect modulus of elasticity" concept also could get satisfactory results.
Bo Y.,Changchun Architecture and Civil Engineering College
Proceedings - 2015 7th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2015 | Year: 2015
This paper on China's part of a comprehensive private hospital management at present, medical resources and marketing strategy of comparative study, analysis of the private hospitals want to in the fierce market competition in the future and the masses of the health service level is improved form, private hospitals must break the constraints of the bottleneck in its development to enhance the core competitiveness their own, in order to play its proper role in the medical market. © 2015 IEEE.