Process planning and accuracy distribution of marine power plant modularization
ZHANG Jinguo，LIU Chunlin，WANG Gangwei，TIAN Jiabin
Wuhan Second Ship Design and Research Institute，Wuhan 430205，China
Abstract:[Objectives] Modular shipbuilding can shorten the cycle of design and construction，lower production costs and improve the quality of products，but higher shipbuilding capabilities are required，especially for the installation of power plants. Because of such characteristics of modular shipbuilding as the high precision of docking links，long size equipment installation chain and quantitative docking interfaces，docking installation is very difficult due to high docking deviation and low accuracy of docking installation，leading to the abnormal vibration of equipment. In order to solve this problem，［Methods］on the basis of domestic shipbuilding capability，numerical calculation methods are used to analyze the accuracy distribution of modular installation.［Results］The results show that the accuracy distribution of different docking links is reasonable and feasible，and the setting of adjusting allowance matches the requirements of shipbuilding. ［Conclusions］ This method provides a reference for the modular construction of marine power plants.
Key words：marine power plant；modular construction；process planning；accuracy distribution
0 Introduction
Modular shipbuilding can not only shorten the period of ship design and construction, improve the product quality and reduce the manufacturing cost, but also facilitate the installation, maintenance and replacement of equipment and reduce the related costs. As an important part of the ship and the main cabin distribution system, the improvement of the modular degree of the power plant not only lays the foundation for the modular shipbuilding, but also helps to improve the power density of the power plant, reduce the ship load, and effectively use the narrow ship space. Therefore, the power plant has gradually developed towards integration and modularization, forming the power plant module.
The key of modular construction is modular design. At present, the modular design of the project mainly focuses on the overall technology of the ship, less research and Analysis on the modular design of power plant; at the same time, less research on the modular construction accuracy distribution of power plant. Therefore, according to the characteristics of high installation accuracy of large ship power plant, strong interaction of equipment installation dimension chain, wide area of installation equipment design cabin and great installation difficulty, this paper aims at the construction of 'power plant module shafting propeller', carries out systematic process design, and applies numerical analysis method to power plant installation workers In order to provide necessary guidance and technical support for the subsequent modular construction of power plant, the influence and distribution of installation accuracy caused by sequence are calculated and analyzed.
1 Power plant module shafting propeller construction process design
The power unit module mainly includes the integrated installation platform, as well as the turbine, reducer, condenser, cooling water pump and other multiple equipment installed on the integrated installation platform. The power from the turbine is transmitted to the shafting through the reducer, and the steam after the work is cooled by the condenser, while the condenser completes the cooling function through the cooling water system; the water inlet and outlet of the cooling water system The water pipeline is connected with the hull structure and the cooling water pump on the platform, and some pipes of the cooling water system are directly installed on the platform. The physical connection relationship of the above platform, equipment and system pipeline is shown in Figure 1. Before entering the cabin, carry out the installation work after the completion of assembly and commissioning test. However, the shafting of large ships is long, mainly including thrust bearing, main shaft, elastic coupling and other types of equipment. The propeller is installed at the stern end of the shafting.
Fig.1 Sketch map of“marine power plantshafting-propeller-hull”
The construction process design of power plant module shafting propeller mainly involves the following key issues.
Unified installation benchmark
The establishment of a unified installation benchmark is the basis for accurate positioning and installation, as well as for ensuring that the docking installation of shafting and reducer, and the installation of inlet and outlet pipes of cooling water pump meet the requirements of installation accuracy and vibration and noise control.
- Unified datum can reduce the error influence in the process of datum transformation and improve the construction accuracy. After the benchmark is determined, the benchmark shall not be adjusted at will.
- On the basis of unified datum, the accuracy of measuring tools should be improved, and the detection means of hull structure deformation and equipment installation state should be strengthened.
- Refine the technical requirements for equipment installation and docking accuracy, and improve the level of fine design and construction.
- On the basis of the above work, necessary 'intermediate installation state' inspection and measurement links (similar to the 'research and assembly' link in mechanical assembly) shall be set to reduce the impact of installation error accumulation effect on the installation state.
Power unit module and shafting installation process design
The equipment on the power unit module shall be installed in the cabin after assembly on the platform, and shall be connected with the
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