Center Shipbuilding Model Study And Application

The main clue of this article is the thought of general assembly and establishing Lean Structure,which is the intention and starting point of the Center Shipbuilding model with a goal of realizing Lean Production. The key of Lean structure is the integral structure with dry-docks as a core. By analyzing the effects of technology improvement,the article draws the conclusion that the development toward general erection is an inevitable tendency. The supply chain by which the lean structure links to the outside could be divided into inner supply chain and outer supply chain. The analysis of formation of supply chain with ship plate as an example and the research into how to select provider by level analyzing method and then establish provider database according to credit are also discussed in this article.The author researches in the complexity of shipbuilding starting from that of general manufacturing system. The effective channel is to raise information quantity,reduce control levels,implement an effective control and reduce unnecessary links. In this article,the concept of center production model and also the comparison with the traditional models are put forward. The center production model combines the advantages of specialization and comprehensiveness and differs from the traditional models as a totally new way of comprehensively production organizing method. In the working process,every production center is,guided by a general plan,a relatively independent unit of responsibility,which makes interim products according to a direction and realizes the control of quality and cots,all of which finally leads to the profits of the enterprise. The author discuses the characteristics of center production models and its operation mechanism,with the system structure as a key.The core of center model operation method is the products-guiding jobdisintegration,which covers design,manufacture and whole management links. Firstly,the concept of PWBS and the features of task packages,which are grouped according to similarity,are analyzed. In accordance with PWBS principle,the realizing channels of PWBS under center production is expounded. The concept of similarity degree is for the first time introduced into PWBS,for the purpose of analyzing the geometrical shape and production features of interim products. The author analyzed by example the accurate calculation method of similarity degree and the prospect of its practical application. The article also probes the automatical categorization of block job by using blur grouping analyzing theory,which is the similarity application in shipbuilding.One important feature of center production model is direction of plan. The establishment of a plan system is key to realize an orderly and high efficient control of the system. The article analyzes the frame time planning of shipbuilding system,introduces the concept of flexible plan,realizing channels,and also the establishing principle and methods of long-term planning,middle-term planning,center planning,monthly plan,weekly planning,and daily planning under center production model. The article analyzes work hours and its distribution to centers according to research into shipbuilding efficiency. Basing on the labor load condition in centers,human power scheduling is also a flexible.IHOP scheduling is an integral part in realization of center model with a plan as a guideline. For the reason that the optimum plan are all NP or NPC problems which are big obstacles to plan drawing and optimizing,the article puts forward an improved genetic algorithm to solve the problem of IHOP and discusses how to simplify them. The programming on such a basis to try calculation is feasible.The article gives out a calculating method by using a simulation random optimizing method and explains by a detailed example that it could solve the complex problem of optimum of dock place order combination. In the two typical production centers-flat panel and curved panel centers,production line anddispersed production method are adopted. P...