Time filter

Source Type

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.

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.

Yang Z.N.,Tsinghua University | Xia Y.,Tsinghua University | Xia Y.,Wuchang Shipbuilding Industry Co. | 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.

Ye M.,Wuchang Shipbuilding Industry Co. | 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.

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.

Discover hidden collaborations