Ye M.,Wu Chang Shipbuilding Industry Company Ltd |
Li M.,Dezhou University |
Duan M.,China University of Petroleum - Beijing |
Gao P.,Fudan University |
And 4 more authors.
Ships and Offshore Structures | Year: 2015
It is of significant importance to monitor the attitude of ship during navigation and operations. The three uppermost parameters of the attitude monitoring are roll, pitch and heave. For measuring the above parameters accurately, a sensor is designed in this paper. First, the attitude algorithm of this sensor is learned. A modified Rodrigues parametrisation-based method is developed in solving the attitude algorithm and extended Kalman filter algorithm is used to achieve the optimal value. The sensor calibration model was studied too. Second, in order to observe and measure the results more conveniently and intuitively, a user-friendly monitoring system is developed. Due to the development of the corresponding analysis system, the measured results can be analysed for a better understanding of the characteristics of the ship. Specially, the ship command parameters are as the input of the sensor and the corresponding closed-loop measure, and control system is designed to solve the problem that the current study cannot eliminate the effects of the attitude measurement inaccuracy of the sensor very well owing to the ship’s acceleration. The control strategy is verified by the sea trials because the attitude measurement error caused by the ship’s acceleration is significantly reduced. The accuracy of the designed attitude sensor is also verified. More importantly, the application prospects of the designed are also illustrated in this paper. © 2014, Taylor & Francis.
Huang C.,Wuchang Shipbuilding Industry Co.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2013
The paper built the ship collision risk evaluation model based on the fuzzy theory, by the relevant parameters on the ship intelligent collision avoidance process to select the appropriate evaluation of ship collision dangerous degree set as well as the impact of various factors on the degree of collision risk weights. It established decision model of collision avoidance action by searching the ship collision dangerous degree of the minimum collision avoidance action. Using Visual Studio 2008 development environment and the simulation model in the electronic chart, the experimental results verify the correctness of the model and the rationality.
Wang L.,Wuhan University of Technology |
Zhou R.,Wuhan University of Technology |
Xu X.,Wuhan University of Technology |
Gao H.,Wuchang Shipbuilding Industry Co.
Journal of Marine Science and Application | Year: 2012
When an oceanographic vessel is sailing, the currents near the surface of ship hull are rapid, making it hard to meet the environmental requirements of scientific observation equipment. To guarantee the installation space and environmental requirements of the observation equipment, the drop keel system was proposed for the first time for ocean-graphic ships at China, to avoid the traditional "rudder-shaft" type fin keel's disadvantage. The research study will examine the operational mechanism and functions of the drop keel system, the operating conditions of the fin keel to determine the driver method and its arrangement, and the locking method of the fin keel underwater. The research will also provide some general designs for analyzing the best plan for the drop keel system. © 2012 Harbin Engineering University and Springer-Verlag Berlin Heidelberg.
Yang Z.N.,Tsinghua University |
Xia Y.,Tsinghua University |
Xia Y.,Wuchang Shipbuilding Industry Corporation Ltd. |
Enomoto M.,Ibaraki University |
And 2 more authors.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2016
The growth of austenite from pearlite in high-carbon low alloy steel occurs with and without alloy element redistribution depending on the amount of superheating above the eutectoid temperature. The transition temperature of austenite growth (denoted PNTT) is calculated as a function of pearlite transformation temperature and subsequent holding time, which affect the degree of partitioning in pearlite, using experimental partition coefficients kθ/α of Mn, Cr, Co, Si, and Ni reported in the literature. PNTT is the highest in Cr-containing alloys which have the largest kθ/α in pearlite. Post-transformation aging, usually accompanied by cementite spheroidization, leads to a marked increase of PNTT in Mn and Cr alloys. PNTT of Ni alloy does not depend on pearlite transformation temperature because practically the formation of partitioned pearlite is severely limited in this alloy for kinetic reasons. Above PNTT, austenite growth occurs fast initially, but slows down in the order of ten seconds when the ferrite disappears, and the remaining small carbide particles dissolve very slowly under the control of alloy element diffusion. © 2015, The Minerals, Metals & Materials Society and ASM International.
Zhou H.,Jimei University |
Zhou H.,Xiamen University |
Du C.,Wuchang Shipbuilding Industry Co. |
Huang Y.,Xiamen University
Advanced Materials Research | Year: 2012
After millions of years of competition and the natural evolution of species, the biological nature (plant leaves) has formed a number of natural and rational structure. This form of the structure and organisms inherit environmental stress exist some connection. This paper as a study of plant leaves, using numerical simulation methods to explore the structure and mechanical properties of plant leaves the relationship between: Collection of fresh plant leaves, leaf through the AutoCAD software to obtain the coordinates of the point cloud, created in the ANSYS finite element model of a simplified blade, applied uniformly distributed wind load calculations to solve; and optimal blade vibration modal analysis program. © (2012) Trans Tech Publications.
Zhao Y.,Wuhan University of Technology |
Yan R.,Wuhan University of Technology |
Ke J.,Wuchang Shipbuilding Industry Co. |
Yang B.,Zhuxi County Transportation Council |
Zhan Q.,Zhuxi County Road Administration
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015
Fillers of the stone arch bridge can enhance arch thrusts, scatter the concentrated load on stone arch and reduce structural stress concentration. Different fillers have different influences on the performance of a stone arch bridge, and a good understanding of filler parameters to the performance of a stone arch stone is important to arch bridge design and performance analysis. Building a stone arch bridge finite element model, using Drucke-Prager yield criterion, the paper analyzed the influences of four typical fillers with different parameters on the stone arch bridge. The analysis showed different fillers have different effects on the influence of the deflection and stress of the arch ring when under dead load and live load. A load test result of on a stone arch bridge in Shiyan is corresponding with the analytical result from finite element model test, in order to accurately understand the mechanical properties of a stone arch bridge, attention should be paied to the effects of the filler parameters. ©, 2015, Wuhan University of Technology. All right reserved.
Yang D.-F.,LiuZhou Vocational & Technical College |
Xie B.-L.,Liuzhou City Career Academy |
Yang W.-Q.,Wuchang Shipbuilding Industry Co.
Zhuzao/Foundry | Year: 2016
The large thick wall sheath in high manganese aluminum bronze used for export is one of the important components of the marine propeller, and the quality requirement of this component is very high. The method to determine the technological parameters of centrifugal casting and the design of the casting mould were introduced, in this article. The author presented a method to calculate the depth of fillet puncture in casting, which offers the basis theory for the design of the metal allowance of fillet puncture in casting. For the large vertical centrifugal casting, the risk of the mould break is high when material of the metal mould is cast iron. Therefore, the author stated a method of strength check for the metal mould. During the strength check, the maximum temperature of casting mould shall be calculated, and this needs to seek the solution of indefinite equations. The successive approximation algorithm was used to acquire a more accurate result. © 2016, Chinese Mechanical Engineering Society. All right reserved.
Chen Y.,Liuzhou Vocational & Technical College |
Xie B.-L.,Liuzhou City Career Academy |
Yang W.-Q.,Wuchang Shipbuilding Industry Co.
Zhuzao/Foundry | Year: 2016
When casting length exceeds centrifugal equipment ability, the requirement for mould work can be met by equipment transform, changing short shafting into long shafting. Mould was designed on the basis of symmetry and stableness, the axial float and radial runout of mould were relieved, and the crack defects were decreased. The minimum cross-section area of tap hole was computed on the basis of spread mould thickness in initial three seconds and initial pressure head, the cold shut and interlayer defects were relieved by increasing pouring speed. The microcosmic exhaust channel was formed on mould inner layer coating surface by adopting special coating, which prevent gas holes defect effectively. © 2016, Chinese Mechanical Engineering Society. All right reserved.
Wanquin Y.,Wuchang Shipbuilding Industry Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2010
Large Al bronze bush was produced by cen trifugal casting. Matching relationship between equipment parameters and mould parameters, between mould parameters and bush parameters as well as a mong centrifugal casting parameters were described in condition of limited state of centrifugal machine. Possibility of centrifugal casting for mould with occurrence of offcenter was discussed during process. Meanwhile, prevention of defects in centrifugal casting large Al bronze bush was introduced.
Lyu X.,Nanyang Technological University |
Tang H.,Nanyang Technological University |
Sun J.,Huazhong University of Science and Technology |
Wu X.,Huazhong University of Science and Technology |
Chen X.,Wuchang Shipbuilding Industry Co.
Brodogradnja | Year: 2014
This paper presents a mixture-model based computational fluid dynamics (CFD) simulation on the two-phase microbubble flow over the hull of a SUBOFF model, aimed at assessing the roles of air-injection-to-freestream velocity ratio and air volume fraction in microbubble resistance reduction. The numerical framework consists of the Reynolds-average Navier-Stokes (RANS) equations and the standard k - ε turbulence model with standard wall function treatment, which is validated, without microbubbles, by existing experimental data of the same SUBOFF model. The effect of velocity ratio is then investigated by comparing different types of the resistance reduction at various water speeds, and the effect of air volume fraction on the friction resistance reduction is also studied with various air injection velocities. This study confirms that both the velocity ratio and air volume fraction play important roles in the microbubble resistance reduction phenomenon. © 2014, Brodarski Institute. All rights reserved.