|Table of Contents|

Simulation of crane ship’s ballast system based on well cluster theory(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年02期
Page:
82-89
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Simulation of crane ship’s ballast system based on well cluster theory
Author(s):
DONG Zhi-hui1;  HAN Duan-feng1;  LIN Xiao-jie2;  YUAN Li-hao1;  ZAN Ying-fei1
1. School of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China; 2. COOEC Subsea Technology Co., Ltd., Shenzhen 518067, Guangdong, China
Keywords:
ship engineering;  crane ship;  ballast system;  well cluster theory;  pipe network;  dynamic transferring;  real-time simulation
PACS:
U664.8
DOI:
-
Abstract:
The virtual well cluster system and pipe network structure model of crane ship’s ballast system were established, the calculation methods of node’s water head and flow rate were analyzed, the calculation equation of pressure drop loss of pipe was researched, and the open degrees of valves and the special nodes such as pumps were considered. The flow rate-water head matrix equation of pipe network was built, and the water heads of nodes were calculated by using matrix partitioning and iteration methods. The pre-transferring routine of actual flow path was calculated in order to improve the calculation efficiency of matrix equation. The simulation system was built based on a crane ship’s ballast system, and the man-computer interactive operation of pipe network was implemented, and the working status of system was monitored real-timely. In simulation experiment, the open degrees of valves were set as 1.0 or 0.5 in different cases respectively, the output flow rate of ballast pump was 3 500 m3·h-1, and the flow was transferred into 6 ballast tanks including 8P, 8S, 6P, 6S, 4P, 4S. Simulation result indicates that when the open degrees of all valves are set as 1.0, the flow rates of 6 ballast tanks are 603.73, 603.73, 605.88, 605.88, 540.39 and 540.39 m3·h-1 respectively, and the flow rate is inversely proportional to the length of pipe network. When the open degrees of valves of 8P and 8S are both adjusted to 0.5, the flow rate of 6 ballast tanks are 484.87, 484.87, 670.19, 670.19, 594.94 and 594.94 m3·h-1 respectively. Obviously, the flow rate is sensitive to the open degrees of valves, and the open degrees has more impact on the flow rates of adjacent nodes, which has a high agreement degree to the actual system. The convergence rate of algorithm is high, and the calculation values of flow rate closely approach steady solution after circulation of 5 times. 1 tab, 17 figs, 22 refs.

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Last Update: 2016-04-20