The Building Of Salvage Software Framework Platform And The Study Of Calculation Principles

In recent years, with the rapid development of shipbuilding industry, marine transportation, offshore oil and gas industry, marine engineering construction, coastal tourism and the fishing aquaculture and other industry, the tonnage of the vessel in distress is also growing. Large-tonnage salvage requires a lot of resources, how to develop a high-quality project to ensure rational use of resources is the key of success of the job. Emergency salvage operation requires time as short as possible, put forward higher requirement of the formulation of the salvage project. Therefore, how to establish the high-quality salvage project in a short period of time is the key to enhance the capacity of salvage operations of our country. Currently abroad has been widely used computer-aided technology to improve efficiency in the salvage operation, China’s shipbuilding and marine engineering calculation and analysis technology started late, no highly integrated monitoring platform, salvage engineering computing has obvious disadvantages.Commonly calculation software used in the salvage engineering includes static hydraulic calculation software GHS, finite element analysis software ANSYS and ship hydrodynamic analysis software HydroStar. GHS is mainly for the wreck grounding calculations and stability analysis, ANSYS mainly carried out overall and local strength for the ship, HydroStar is mainly for the wreck hydrodynamic analysis. These three software have their own advantages in salvage engineering calculations, but there are some aspects in need of improvement, including:(1) When using GHS to build ship models, we need to manually input the data of offsets table to establish the hull model of ship, and then manually enter the location information of each compartment to create cabin model, this has led to the modeling process more cumbersome, time-consuming and labor-intensive.(2) When using ANSYS to check the strength of ship, we need to enter the results of GHS calculation, including the shear and moment of wreck, grounding force of wreck, pulling force and lifting force of wreck and other data. However, there is no data interface between the ANSYS and GHS, therefore the results of GHS calculation can only be collected to ANSYS by manual, time-consuming and labor-intensive; On the other hand, frequent switching between the two computing software, will also affect the work efficiency of engineering and technical personnel.(3) When using HydroStar to carry out the hydrodynamic analysis of ship, we need hydrodynamic model of the ship and the information such as cabin load and so on. If we can solve the data interface issues between it and ANSYS、GHS software, will save a lot of time.To solve the above problems, this paper carried out the following work:(1) Establish flow diagram of salvage according to the basic process of salvage project.(2) According to the flowchart, the use of VB to build salvage software framework platform, which can integrate the GHS、ANSYS and HydroStar into a single platform.(3) According to salvage calculation principles, making the design of data between software in frame platform by using VB and ANSYS parameter language APDL command stream, realizing issues of rapid prototyping by GHS and developed the approach that ANSYS calls GHS results and calculates.(4) By analyzing a salvage project example, verifying the scientificity of software platform.With the research work, we can draw some conclusions as following:(1) According to salvage procedures and the need of calculation, to build a flowchart of platform framework, which reasonable compliance with the specific process of salvage engineering and has high feasibility.(2) The building of software framework platform depended on the flowchart of platform, it contains five modules which in full compliance with the order before and after the actual salvage engineering design process, achieving the anticipation that integrate a salvage project design on a software framework.(3) Making the secondary development for the software framework platform, achieving the VB programming language to control the read of table of offsets and the rapid modeling with AutoCAD, and through addressing data interface issues betwwen AutoCAD and GHS to achieve rapid modeling and the time-saving purposes; We can make the secondary development of data exchange between GHS and ANSYS software by using APDL language commands stream to achieve the purposes of strength check througth ANSYS used the calculated results of GHS; By analyzing HydroStar, GHS and ANSYS data types, achiving the ANSYS model transforms into HydroStar model and the hydrodynamic analysis by HydroStar using the results data of GHS.(4) Through a salvage project example, verifying the feasibility and practicability of software framework platform, achieving the purpose of integrating the salvage project design into a single platform.