Zhang J.,North China Institute of Aerospace Engineering |
Ling C.,China Petroleum Pipeline Bureau
Applied Mechanics and Materials | Year: 2014
In this paper, the stability of discrete singular bilinear systems is discussed by the method of Lyapunov function. Some asymptotic stability criterions are given according to the equivalent system and the equivalent transformation, and the regularity is considered. © (2014) Trans Tech Publications, Switzerland.
Ren F.,Northeast Petroleum University |
Chen S.,Northeast Petroleum University |
Wang W.,China Petroleum Pipeline Bureau
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2014
For string automatic processing problems of the gear rack drilling rig for slant well, through the top drive and track clamp joint practices, an automated device was devised, which could fulfill the need of the make-up and break-out and spinner action, and hydraulic control system was designed. The bond graph theory was applied to design the bond graph model of the power head spin buckle system and the track clamp system, and the state equations of system were derived from bond graph model. In the 20-sim software, the dynamic simulation analysis was carried out and the simulation parameters of the bond graph element were calculated, the rationality of the model was validated through comparative analysis, which provides technical support and theoretical guidance for the research of the make-up and break-out equipment of the oil drilling rig for slant well.
Gao H.,China Petroleum Pipeline Engineering Corporation |
Li G.,China Petroleum Pipeline Engineering Corporation |
Ma X.,China Petroleum Pipeline Engineering Corporation |
Guo J.,China Petroleum Pipeline Engineering Corporation |
Ma J.,China Petroleum Pipeline Bureau
ICPTT 2011: Sustainable Solutions for Water, Sewer, Gas, and Oil Pipelines - Proceedings of the International Conference on Pipelines and Trenchless Technology 2011 | Year: 2011
This paper presents eight horizontal directional drilling crossing cases and their problems and solutions. These crossings were conducted by horizontal directional drilling company of petroleum pipeline bureau in China, and to make it clear, these crossings are classified into three categories according to the major geological conditions. © 2011 ASCE.
Gan Y.,North China Institute of Aerospace Engineering |
Xu A.,CAS Beijing Institute of Applied Physics And Computational Mathematics |
Zhang G.,CAS Beijing Institute of Applied Physics And Computational Mathematics |
Yang Y.,China Petroleum Pipeline Bureau
EPL | Year: 2013
We present a simple and general approach to formulate the lattice BGK model for high-speed compressible flows. The main point consists of two parts: an appropriate discrete equilibrium distribution function (DEDF) feq and a discrete velocity model with flexible velocity size. The DEDF is obtained by feq = C-1M, where M is a set of moments of the Maxwellian distribution function, and C is the matrix connecting the DEDF and the moments. The numerical components of C are determined by the discrete velocity model. The calculation of C-1 is based on the analytic solution which is a function of the parameter controlling the sizes of discrete velocity. The choice of the discrete velocity model has a high flexibility. The specific-heat ratio of the system can be flexible. The approach works for the one-, two- and three-dimensional model constructions. As an example, we compose a new lattice BGK kinetic model which works not only for recovering the Navier-Stokes equations in the continuum limit but also for measuring the departure of the system from its thermodynamic equilibrium. Via adjusting the sizes of the discrete velocities, the stably simulated Mach number can be significantly increased up to 30 or even higher. The model is verified and validated by well-known benchmark tests. Some macroscopic behaviors of the system due to the deviation from thermodynamic equilibrium around the shock wave interfaces are shown. © EPLA, 2013.
Zhang X.,Chongqing Jiaotong University |
Liu J.,China Petroleum Pipeline Bureau
Advanced Materials Research | Year: 2011
Because double side drift excavation method named eye excavation method has been a mature and reliable excavation method, it has normally been used in tunnels with super cross-section and super large section area. However, the construction speed using this method is very slow. One of reasons is that the construction technology of this method would be more and complex. The other is that all construction workers, materials, equipment would be extremely difficult for their up and down, and that the ballast rock would have to be moved by artificial when the upper step of the middle guide hole would be excavated. In this paper, to speed up the process of excavating tunnel with super cross-section and super large section area underpass extra-high building, the elastic-plastic numerical simulations for the tunnel named Industry and Trade Station of the third line in Chongqing Rail Transit were made in four excavation methods conditions. The four excavation methods is respectively the double side drift excavation method to the first excavation in main building side, the double side drift excavation method to the first excavation in podium side, the single side drift excavation method in the upper step to the first excavation in main building side and the single side drift excavation method in the upper step to the first excavation in podium side. The main building is named Industry and Trade building with 22 floors. The results showed that the single side drift excavation method in the upper step could Insure the building and tunnel when the support measures were reasonable, that the guide hole beside the little surface load should firstly be excavated by whether double side drift excavation method or single side drift excavation method, and that these would provide a reference for some similar engineering. © (2011) Trans Tech Publications, Switzerland.
Di X.J.,Tianjin University |
An X.,Tianjin University |
Cheng F.J.,Tianjin University |
Wang D.P.,Tianjin University |
And 2 more authors.
Science and Technology of Welding and Joining | Year: 2016
The inter-critically reheated coarse-grained heat-affected zone (ICCGHAZ) of X70 pipeline steel with different second peak temperature and heat input was simulated in this study by means of Gleeble3500 simulator. The volume fraction, size, shape and distribution of martensite–austenite (M–A) constituent were analysed. The toughness of ICCGHAZ and corresponding fractographs were examined. The results showed that the distribution of M–A was strongly influenced by second peak temperature, and M–A constituent with necklace structure at lower second peak temperature led to worse toughness. The volume fraction and size of M–A were strongly affected by heat input, the volume fraction of M–A constituent increased with the increase of heat input; the volume fraction and size of M–A were key factors of toughness deterioration; the interfacial energies and the initiation of crack were related to the shape of M–A constituent. © 2016 Institute of Materials, Minerals and Mining.
Li J.-H.,Anhui Electrical Power Design Institute |
Li J.-H.,China University of Mining and Technology |
Wang Y.-S.,China University of Mining and Technology |
Li D.-H.,China Petroleum Pipeline Bureau |
Zhang C.-Y.,China University of Mining and Technology
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011
In order to study the stress and deformation law of freezing pipes during multi-circle freezing, model tests are carried out based on the similarity theory. The multi-direction law of the freezing pipes under deep ground pressure before excavation is acquired. The following conclusions are drawn through analysis: the deformation of freezing pipes before the stage of excavation is completed during the ealier freezing stage; the strain of freezing pipes in clay stratum is larger than that in sand stratum; the maxmium tension stress in clay stratum is 97.7 MPa, while the maxmium compression stress is 161.5 MPa, and the bending stress is 1.7 times the axial one. The maxmium bending stress is 0.62 times the yield load of freezing pipes, while these stress is very small in sand stratum. The model test aim to improve the stress performance of freezing pipes, to reduce the strain energy storaged in freezing pipes before excavation and to reduce the failure rate of freezing pipes during excavation.
Wang H.,Aalto University |
Wang H.,Harbin Institute of Technology |
Lahdelma R.,Aalto University |
Wang X.,China Petroleum Pipeline Bureau |
And 3 more authors.
Applied Thermal Engineering | Year: 2015
Combined heat and power (CHP) is the main technology for providing the base load of district heating in China. However, CHP is not efficient for providing the peak load; instead, a peak boiler with high efficiency could be used to compensate the peak load. This paper studies how the location of the peak boiler can affect the energy efficiency and economic performance of such CHP based combined district heating system. Firstly, the connection mode and the control strategy for different peak heating locations are analyzed. Then the effect of the peak boiler's location on the initial investment of the network and the cost for distributing heat is studied. The objective is to place the peak boiler in a location where the overall costs are the smallest. Following this rule, the results indicate that the peak boiler should be located at the CHP plant if that allows using cheaper 'self-use electricity' in CHP for distributing the heat. However, if the market electricity price is used everywhere, or if energy efficiency is more emphasized, the location of the peak boiler should be closer to the users with dense heat loads. © 2015 Elsevier Ltd. All rights reserved.
Li K.,China Petroleum Pipeline Engineering Corporation |
Bai Z.,China Petroleum Pipeline Bureau |
Li J.,China Petroleum Pipeline Bureau |
Zhang W.,China Petroleum Pipeline Engineering Corporation
ICPTT 2014 - Proceedings of the 2014 International Conference on Pipelines and Trenchless Technology | Year: 2014
Quantitative Risk Assessment (QRA), as a new technique, is widely applied in construction and operation for oil and gas pipelines. However, QRA technology has usually been applied for land use or making maintenance plans during construction or pipeline operation respectively. Thus it has been applied less for station design of the pipeline. This paper analyzes the risk of a gas station in China by using QRA technology and it provides suggestions for station design according to the assessment results. © 2014 American Society of Civil Engineers.
China National Petroleum Corporation, China Petroleum Pipeline Bureau and China Petroleum Pipeline Machinery Manufacture Co. | Date: 2014-10-22
Disclosed is a lift and rotation mechanism for a quick door-opening device. The power-output end of a first motor (21) of a lift component (2) of the mechanism is connected to one end of a screw rod (22) and the other end of the screw rod (22) is connected to one end of a circular pipe (24); one end of a tubular body (23) is provided with a connection component (26), with one end of a coupling component (4) being connected to the connection component (26) via screws; the other end of the circular pipe (24) is removably connected to a circular door (5) by an annular connection (25); the output shaft of a second motor (31) of a rotary component (3) is removably connected to one end of a rotary shaft (32) provided within a supporting seat (33); the supporting seat (33) is removably connected to an end flange (51); and a circular disk (34) is removably connected to the other end of the rotary shaft (32), and the circular disk (34) is fixedly connected to the connection component (26). The mechanism has the advantages of achieving speedy activation and shutting of a large vertical quick door-opening device, simple operation, and safety and reliability.