Dalian Shipbuilding Industry Co.

Dalian Liaoning, China

Dalian Shipbuilding Industry Co.

Dalian Liaoning, China
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Shao F.,Harbin Engineering University | Guo Z.,Harbin Engineering University | Han D.,Harbin Engineering University | Zheng X.,Dalian Shipbuilding Industry Co.
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2017

Catamarans feature low resistance, fast speed, good maneuverability, and a large deck area. However, due to their small length to breadth ratio, catamarans can twist in oblique waves. To improve the seakeeping performance of fast catamarans, T-foils have been used as stabilizing appendages to provide added mass and damping. However, one of the disadvantages of using T-foils is the increase in total resistance. In this work, our objective was to reduce the resistance of a T-foil-assisted catamaran by fitting flaps beneath both sterns to alter the hull trim. For this purpose, we conducted both numerical simulations and model experiments in a range of advancing speeds to investigate the resistance and seakeeping performance of catamarans with/without flaps and T-foils. Our results indicate that at high-speed navigation with Froude numbers from 0.5~0.8 in calm water, the resistance of the flaps-and-T-foils-assisted catamaran was slightly lower, and the heave and pitch response amplitude operator (RAO) values in waves were 11.2% and 21.3%, respectively, which are lower than those of unassisted catamarans. We also verified the validity of our catamaran hydrodynamic optimization method that employs a built-up appendage comprising flaps and T-foils. © 2017, Editorial Department of Journal of HEU. All right reserved.

Ge G.,Zhejiang GongShang University | Lou Y.,Zhejiang GongShang University | Wang X.,Zhejiang GongShang University | Xue L.,Dalian University of Technology | And 2 more authors.
Proceedings - 2016 9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics, CISP-BMEI 2016 | Year: 2016

This paper provides a brief overview of the approaches for two-dimensional analytic signal construction. According to the basis of definition for one-dimensional analytic signal, a set of desirable properties is determined as the guideline to measure a new definition for two-dimensional analytic signal. To appreciate this guideline, several important definitions are brought out, such as total analytic signal, partial analytic signal and Hahn's twodimensional analytic signal, etc. It is a pity that these definitions cannot satisfy the main properties in the guideline. A chance to solve this problem is provided by the quaternion theory. Based on the Quaternionic Fourier Transform (QFT), a novel definition called quaternionic analytic signal is introduced. This novel definition fulfills most properties in the guideline. © 2016 IEEE.

Wang Q.,Wuhan University of Technology | Tang J.,Zhejiang International Maritime College | Zhuang Z.,Wuhan University of Technology | Song L.,Dalian Shipbuilding Industry Co.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015

Network Schedule is important for improving the production capability of berth or dock. This paper presents some research for optimization and virtual simulation for network. According to the characteristics of the problem of ship assembly, the theory of directed graph and network technique of AOE(Activity on edge)are used to set up the model for solution of the assembly network problem. The algorithm was set up with a improved GA(genetic algorithm) algorithm, which is aimed to short the berth cycle and equipoise the resource utilization. The program for the algorithm was developed and applied to the optimization for network schedule of a shipbuilding case. An interface module was developed for the calculation result and the visual simulation platform Catia/Delmia. The simulation results show that the optimization result of this paper is correct and reliable. The study in this paper is a useful reference for the work of drawing up the network schedule of ship assembly. ©, 2015, Wuhan University of Technology. All right reserved.

Dong H.,Dalian University of Technology | Zhang X.,Dalian University of Technology | Yang J.,Dalian Shipbuilding Industry Co. | Hu W.,Dalian University of Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2014

Aluminum alloy and brass sheets were lap joined by tungsten insert gas(TIG) arc welding using Zn-15%Al solid-cored filler wire. The mechanical properties of the joint, microstructure in the weld and distribution of major alloying elements in the intermetallic layer were examined. The test results display that the tensile strength of the as-welded joints reaches 164MPa, and that of post-weld heat treated joints is as 160MPa. The analysis results reveal that the dendrites further grow up during post-weld heat treatment, and some dendrites detach from the interface into the weld and worsen the joint performance. The intermetallic layer in the joints mainly consists of CuZn5 phases and grows into weld in the form of columnar crystals.

Cao X.,Dalian University of Technology | Yuan J.,YTO Group Corporation | Li W.,Dalian Yiliya Construction Machinery Co. | Ding C.,Dalian Shipbuilding Industry Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

Aiming at the problems of poor precision, low operation efficiency and low security due to the load oscillation of luffing motion for crane, an error asymptotic compensation control method was proposed to minimize the sway angle of load. Based on the analysis of error asymptotic compensation control theory, the error asymptotic compensation controller was designed. Through appropriate adjustments to the two stage compensation coefficients, the sway angle of the lifted load was gradually decreased, meanwhile, the requirements of the acceleration and the pump displacement were met. The MATLAB simulation results show that error asymptotic compensation controller has good robustness and control precision for different ropes and jib lengths. After the crane began to brake, the sway angle is reduced to below 0.003 rad in 10 seconds. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved.

Sun T.,Harbin Engineering University | Zhang Z.Q.,Harbin Engineering University | Sun C.J.,Dalian Shipbuilding industry co. | Ma Z.W.,703th Research Institute of China Shipbuilding Industry Corporation
Advanced Materials Research | Year: 2014

The existing fire-extinguishing plants have a lot of problems. For example, the amount of extinguishant is very large, mix is uneven, extinguishant is easy to splash, harmful to the human, the system structure is complex, spray nozzle is demanding and so on. And the open literature sources on the marine fire hydrant are very few. Besides because of the difficulty of numerical simulation of two-phase flow, the research on numerical simulation of the marine fire hydrant is hardly any. In this thesis, a new-style marine fire hydrant is designed to be small volume, easy to use and low pressure lost. It blends the gas to water through its special structure. It regards the gas-water mixture as the extinguishant. In this way, the water flow can be soften, and reduce the splash. The extinguishant can overlay the burnable body uniformly. At last, reach the better extinguishant under the dual effect of the oxygen exclusion and cooling. © (2014) Trans Tech Publications, Switzerland.

Sun T.,Harbin Engineering University | Zhang M.F.,Harbin Engineering University | Sun C.J.,Dalian Shipbuilding industry co. | Ma Z.W.,703th Research Institute of China Shipbuilding Industry Corporation
Applied Mechanics and Materials | Year: 2014

Marine gas turbine exhaust ejector device is responsible for reducing or eliminating the infrared signatures of exhaust system. In order to optimize the structure of exhaust ejector and shorten the cycle of research, it is essential to study the successful experiences on exhaust ejectors by scholars abroad. In this article two structure innovations were introduced: the nozzle structure changing from circular to rectangular and multi-stage diffuser, then a new type of marine gas turbine exhaust ejector was designed. Through simplifying the ejector model, numerical simulation was used to predict the characteristics of both the single-stage ejector and the multi-stage ejector. The result indicates the effects of structural parameters on the performance parameters. This research result has certain reference value for marine gas turbine exhaust ejector structure innovations and performance optimization. © (2014) Trans Tech Publications, Switzerland.

Li B.,Dalian Shipbuilding Industry Co. | Jiang D.,Dalian Shipbuilding Industry Co. | Tian T.,Dalian Shipbuilding Industry Co. | Wang Z.,Dalian Shipbuilding Industry Co.
Ship Building of China | Year: 2015

There is complex operation condition for large LNG carrier with numbers of cargo tanks and large volume. General performance analysis of the carrier is of great significance in its design process. Key techniques in general design are researched in this paper, including principal dimension, shape of cargo tank, arrangement of cargo tank, and performance analysis. The LNG carrier with good performance is expected. ©, 2015, The Editorial Office of Shipbuilding of China. All right reserved.

Yao Y.,Dalian Shipbuilding Industry Co. | Mei R.,Dalian Shipbuilding Industry Co. | Sun G.,Dalian Shipbuilding Industry Co.
Ship Building of China | Year: 2015

Semi-submersible unit is operated in severe environment. It is important to analyze the safety and stability of the unit for offshore oil and gas exploration. Based on the related rules to stability analysis the intact and damage stability of semi-submersible unit is researched and relative critical points are discussed for improving development ability to offshore engineering. ©, 2015, The Editorial Office of Shipbuilding of China. All right reserved.

Peng D.,Dalian Shipbuilding Industry Co. | Tian T.,Dalian Shipbuilding Industry Co. | Qi X.,Dalian Shipbuilding Industry Co.
Ship Building of China | Year: 2015

The accuracy of prediction in ship rolling depends on the calculation of roll damping. Damping coefficient is obtained through experiment, and a new method calculating restoring force is proposed. Based on the method a set of MATLAB program is formed for calculating ship motion. Reliability of the program and the damping coefficient are proved by comparing the results with those from the experiment. Comparing between various methods determining damping, it is shown that the damping determined with experiment is the most reliable. ©, 2015, The Editorial Office of Shipbuilding of China. All right reserved.

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