2010 Vol. 5 No. 1
Abstract：
Based on the source number estimation, a vibration source identification method was proposed for the surveillance and diagnosis of the ship. Using this method, source number is firstly estimated based on the Gerschgo rin＇s disk theorem which can effectively distinguish the source signals from noise signal. Then ,independent sources are separated by the blind source separation technique ,and the separated signals can locate their i individual vibration source by employing the spectrum correlation. Finally, the condition of the equipment in the ship can be identified using the available well-established diagnosis techniques. The validity of the pr oposed methodology was confirmed on a ship model in this paper.
Based on the source number estimation, a vibration source identification method was proposed for the surveillance and diagnosis of the ship. Using this method, source number is firstly estimated based on the Gerschgo rin＇s disk theorem which can effectively distinguish the source signals from noise signal. Then ,independent sources are separated by the blind source separation technique ,and the separated signals can locate their i individual vibration source by employing the spectrum correlation. Finally, the condition of the equipment in the ship can be identified using the available well-established diagnosis techniques. The validity of the pr oposed methodology was confirmed on a ship model in this paper.
2010, 5(1): 6-9,13.
DOI: 10.3969/j.issn.1673-3185.2010.01.002
Abstract：
The integration of Fluent based on Patran is widely used in ship mechanics computations and fluid-solid coupling analysis. However, the method to transform the models from Patran to Fluent is critical during the inte gration of the two. Considering the geometric model features of both Patran and Fluent,the details of transform process are described and the application examples are presented. The validation examples show that the di scussed method can quickly and efficiently extract the model information from Patran and then convert them into the format of Fluent. At the end, the advantages and disadvantages of the method are discussed and future applications in the integration of the CAD / CAE software are previewed.
The integration of Fluent based on Patran is widely used in ship mechanics computations and fluid-solid coupling analysis. However, the method to transform the models from Patran to Fluent is critical during the inte gration of the two. Considering the geometric model features of both Patran and Fluent,the details of transform process are described and the application examples are presented. The validation examples show that the di scussed method can quickly and efficiently extract the model information from Patran and then convert them into the format of Fluent. At the end, the advantages and disadvantages of the method are discussed and future applications in the integration of the CAD / CAE software are previewed.
2010, 5(1): 10-13.
DOI: 10.3969/j.issn.1673-3185.2010.01.003
Abstract：
An algorithm to combine the Lattice-Boltzmann (LB) method and the sub-grid model is introduced and is used to simulate the flow around a cylinder under subcritical Reynolds number. The obtained streamline of the fl ow field and the pressure coefficient around the cylinder are found to agree well with the data from tests. The agreement indicates that the discussed method suits those problems with relatively high Reynolds number an d inherits the computation efficiency of the LB method.
An algorithm to combine the Lattice-Boltzmann (LB) method and the sub-grid model is introduced and is used to simulate the flow around a cylinder under subcritical Reynolds number. The obtained streamline of the fl ow field and the pressure coefficient around the cylinder are found to agree well with the data from tests. The agreement indicates that the discussed method suits those problems with relatively high Reynolds number an d inherits the computation efficiency of the LB method.
2010, 5(1): 14-18.
DOI: 10.3969/j.issn.1673-3185.2010.01.004
Abstract：
穿浪双体船的连接桥在横浪和斜浪中遭受比较大的横向弯矩和扭转力矩的作用，其自身的强度对穿浪双体船的安全性来说至关重要。本文在有限元理论的基础上，采用直接计算方法对一艘穿浪双体船进行了横向强度和扭转强度的整船有限元分析.对其总强度进行了校核，并初步分析了该船上层建筑对总横强度的影响。通过对计算结果的分析.掌握了该船的应力分布，为结构优化设计提供依据。
2010, 5(1): 19-23,38.
DOI: 10.3969/j.issn.1673-3185.2010.01.005
Abstract：
为解决舰船总布置设计的复杂性和多样性带来总布置多方案评估的困难，针对舰船总布置设计建立多目标综合评估模型.在对蚁群算法做出适应性改进的基础上，提出多专家综合评估算法，通过文章介绍的舰船总布置设计的数学模型及评估算法的处理流程，可有效应用于舰船总体布置设计，实现自动舰船总布置多方案评估选优，有效地解决了工程问题，该方法可提高舰船总布置设计综合评估的自动化程度。
2010, 5(1): 24-27.
DOI: 10.3969/j.issn.1673-3185.2010.01.006
Abstract：
As a new concept in ship design, ballast-free ship has been studied extensively abroad, but it is rarely mentioned in China. In this paper, the design and variation of the hull lines for this kind of ships were studi ed and a new design and variation method was proposed under the assumption that area of the mid-ship section equals to that of the mother ship. With this method, the hull lines of the bottom of the mother ship was chan ged into V-Shape, so that the designed ship has an inclined angle at the bottom with a wider breadth while the area of the mid-ship section was kept unchanged. The proposed new method is simple but reliable. It can obt ain smooth hull lines for the design ship with the major factors unchanged, such as length, draught and displacement, etc.
As a new concept in ship design, ballast-free ship has been studied extensively abroad, but it is rarely mentioned in China. In this paper, the design and variation of the hull lines for this kind of ships were studi ed and a new design and variation method was proposed under the assumption that area of the mid-ship section equals to that of the mother ship. With this method, the hull lines of the bottom of the mother ship was chan ged into V-Shape, so that the designed ship has an inclined angle at the bottom with a wider breadth while the area of the mid-ship section was kept unchanged. The proposed new method is simple but reliable. It can obt ain smooth hull lines for the design ship with the major factors unchanged, such as length, draught and displacement, etc.
2010, 5(1): 28-33.
DOI: 10.3969/j.issn.1673-3185.2010.01.007
Abstract：
Enclosed mast is widely used on ships due to its excellent stealth capability. Towards the structure design of the enclosed mast, a multi-level test scheme is proposed, including tests of typical structure members, p roportional model of full structures and real-time tracking on board. Several new experimental means are discussed in details, such as mast strength tests due to wind loads by sucking disks and springs and due to swing ing motion by an inverted-model. The results indicate that the proposed test method can successfully evaluate mechanical properties in an all-round way such as stiffness, strength and vibration of the enclosed mast wit h high accuracy, cost efficiency and operability.
Enclosed mast is widely used on ships due to its excellent stealth capability. Towards the structure design of the enclosed mast, a multi-level test scheme is proposed, including tests of typical structure members, p roportional model of full structures and real-time tracking on board. Several new experimental means are discussed in details, such as mast strength tests due to wind loads by sucking disks and springs and due to swing ing motion by an inverted-model. The results indicate that the proposed test method can successfully evaluate mechanical properties in an all-round way such as stiffness, strength and vibration of the enclosed mast wit h high accuracy, cost efficiency and operability.
2010, 5(1): 34-38.
DOI: 10.3969/j.issn.1673-3185.2010.01.008
Abstract：
At present, the model of studying fire cannot reflect the flow feature of smoke and gas as well as the distribution of temperature field very well. Also, it has limitation for the irregular space. The GAMBIT was used to generate the meshes for the irregular shapes of submarine cabin, and the N-S time-mean equation and k-s turbulent flow model were used to compute the flow filed. Under the assumption that the combustion chemical reaction is irreversible, fire developing process in the cabin was simulated. Through the critical fire development and the critical fire spreading time, firefighting decisions can be made. Therefore, a real-time and r eliable research method is established to provide strategies in submarine fire fighting.
At present, the model of studying fire cannot reflect the flow feature of smoke and gas as well as the distribution of temperature field very well. Also, it has limitation for the irregular space. The GAMBIT was used to generate the meshes for the irregular shapes of submarine cabin, and the N-S time-mean equation and k-s turbulent flow model were used to compute the flow filed. Under the assumption that the combustion chemical reaction is irreversible, fire developing process in the cabin was simulated. Through the critical fire development and the critical fire spreading time, firefighting decisions can be made. Therefore, a real-time and r eliable research method is established to provide strategies in submarine fire fighting.
2010, 5(1): 39-42.
DOI: 10.3969/j.issn.1673-3185.2010.01.009
Abstract：
对具有搭载舰载机能力的舰船而言，其气流场特性的评估取决于对相应舰载机的起降气流条件限制。通过对美国LHA型舰缩比模型的数值建模，结合两种舰载机起降的气流场限制条件对计算结果进行对比分析。在相同定常来流工况下.分别以±15°风向角对该型舰数值模型的两个起降点进行模拟取值.结合直升机和固定翼短距／垂直起落飞机的起降特性和气流限制条件.尝试提出一种评估舰船气流场特性的直观方法.并得出不同甲板气流区域受上层建筑影响的有关结论。
2010, 5(1): 43-47,67.
DOI: 10.3969/j.issn.1673-3185.2010.01.010
Abstract：
Caring about the users concerns, the current ship supportability should be re-considered. In this paper, some new ideas were proposed using the theories, techniques and methods in system engineering. Research results show that supportability in a ship should be carried on comprehensively through life cycle in system engineering manner.
Caring about the users concerns, the current ship supportability should be re-considered. In this paper, some new ideas were proposed using the theories, techniques and methods in system engineering. Research results show that supportability in a ship should be carried on comprehensively through life cycle in system engineering manner.
2010, 5(1): 48-51.
DOI: 10.3969/j.issn.1673-3185.2010.01.011
Abstract：
舰船狭水道航行是航渡中影响安全的重要阶段。为了安全高效地操纵舰船，有必要对其安全性进行定量安全评价。采用基于AHP模糊评判方法，介绍权重的计算并结合实例说明如何用模糊评判的方法，得出量化的结果，以及在实际问题上的应用，验证了实际应用中的可行性。
2010, 5(1): 52-55.
DOI: 10.3969/j.issn.1673-3185.2010.01.012
Abstract：
传统舰船总体任务可靠性建模方法难以全面反映舰船的实际任务，导致计算结果与实际相差较大。文章提出舰船单元任务的概念.确定舰船单元任务划分原则、单元任务的分类方法及任务的分解方法。基于单元任务改进传统的舰船典型任务剖面.提出新的舰船总体任务可靠性建模方法，并分析基于单元任务舰船总体可靠性模型的应用，示例表明了模型计算的可操作性。
2010, 5(1): 56-59.
DOI: 10.3969/j.issn.1673-3185.2010.01.013
Abstract：
常规潜艇有限的能量供给和潜艇作战需求之间的矛盾仍是制约常规潜艇发展的主要矛盾之一.随着大气环境控制要求的提高.大气环境控制系统的能耗逐渐增大.为了从顶层设计层面协调大气环境控制与能耗之间的矛盾，提出“潜艇舱室热管理”的概念。潜艇舱室热管理即从总体设计角度出发，从功能、能量、控制等方面，全面考虑总体布置、系统结构、部件和环境等相互之间的制约关系，协同控制流动、传热和能量转换利用过程，以实现全系统、全工况最优化，达到提高系统能量利用效率率，降低能耗的目的。
2010, 5(1): 60-63.
DOI: 10.3969/j.issn.1673-3185.2010.01.014
Abstract：
分析船舶轴系回旋振动的传递矩阵计算方法，建立集总参数元件一分布参数元件混合系统模型，得出各种简化模型的传递矩阵。以某型海事巡逻艇为例，对传递矩阵计算方法中影响计算结果的主要参数进行分析，提出参数的选取方法，为回旋振动特性分析提供依据。
2010, 5(1): 64-67.
DOI: 10.3969/j.issn.1673-3185.2010.01.015
Abstract：
In this paper, FEM software ANSYS was used to analyze and simulate the Ω spring in a new stern shaft sealed apparatus. The high stress region of the spring was checked. The relations of the compression vs resistance and compression vs maximum stress were plotted respectively. Two models were considered in the computation. One was to analyze each single ring of the spring and the other was to analyze the spring as a whole. The two models agreed with each other, thus showing the reliability of the modeling technique. The computing results can be consulted during the optimal design of such Ω spring in the sealed apparatus.
In this paper, FEM software ANSYS was used to analyze and simulate the Ω spring in a new stern shaft sealed apparatus. The high stress region of the spring was checked. The relations of the compression vs resistance and compression vs maximum stress were plotted respectively. Two models were considered in the computation. One was to analyze each single ring of the spring and the other was to analyze the spring as a whole. The two models agreed with each other, thus showing the reliability of the modeling technique. The computing results can be consulted during the optimal design of such Ω spring in the sealed apparatus.
Abstract：
Based on the research on water level regulator of steam-power ship＇s main condenser, this paper picked up the relative energy eigenvector by using the convolution type of wavelet packet decomposition, built the stan dard fault database, and took Euclidean space range formula as criterion to identify faults. The experimental results show that this method can diagnose the typical faults of the water level regulator quickly and corre ctly. And this method can also decrease the blindness of the diagnosis and the maintainance.
Based on the research on water level regulator of steam-power ship＇s main condenser, this paper picked up the relative energy eigenvector by using the convolution type of wavelet packet decomposition, built the stan dard fault database, and took Euclidean space range formula as criterion to identify faults. The experimental results show that this method can diagnose the typical faults of the water level regulator quickly and corre ctly. And this method can also decrease the blindness of the diagnosis and the maintainance.
2010, 5(1): 72-75.
DOI: 10.3969/j.issn.1673-3185.2010.01.017
Abstract：
误差的存在严重影响着工程作业的质量，对误差的处理技术已逐渐得到各个行业的高度重视。在给出误差的基本概念、误差的传递与合成公式的基础上，结合舰艇作战系统数据传输的特性，介绍一种信息传输误差的分析方法.并通过分析舰载导航航向信息传输的特点，构建对应信息传输的数学模型。最后通过一组实际测量数据验证说明航向信息模型和该分析方法在工程信息传输过程中的有效性。
2010, 5(1): 76-80.
DOI: 10.3969/j.issn.1673-3185.2010.01.018
Abstract：
研究的寻北导航系统主要以动力调谐陀螺为敏感设备.创新地采用TMS320VC5402芯片作为主处理器构建寻北仪的计算机系统，取代通常构建系统时所用的PC机或单片机.并以CPLD为主要控制辅助组件设计并调试数据的采集、处理、输出、信息通信等硬件电路和相关软件，充分利用DSP快速运算、信息存储、逻辑判断和数据处理等能力完成多种控制任务，在实现寻北功能的同时又使系统的精度、控制和解算能力得到提升。
