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某船载装置的虚拟样机分析
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摘要
计算机及其相关技术的发展和应用为建立机械系统虚拟样机提供了一个切实可行径。通过虚拟样机技术可以解决机械系统设计、制造到使用中的许多难题,为保
     系统的准确和可靠提供了重要的分析方法。虚拟样机技术正以它不可比拟的优被广泛运用在机械系统的设计和分析中。
     本文主要以某船载装置为研究对象,运用多刚体动力学理论,采用三维造型软件和多体系统动力学仿真软件,建立了船载装置的多刚体虚拟样机模型。分析了在不同海况环境下、在不同工况中船载装置的运动状态,得到了船载装置的运动特性和动力参数,并进一步分析了船载装置中的轨道应力应变,为修正和改进船载装置的设计提供了依据。
     在对船载装置进行多刚体动力学分析之后,得到了船载装置轮轨主要接触面的接触力。以此作为输入参数,对轨道进行了有限元结构静力学分析,求得轨道的应力变形。根据轨道变形情况分析船载装置的安全性,提出增加横向轮,减少轨道横向变形的改进措施。
     为了更准确的对船载装置的运动情况进行分析,本文运用多柔体动力学理论,借助多体动力学仿真软件的柔性体分析模块,通过模态中性文件将柔性较大的横向轮支撑板用柔性体进行替换,建立了船载装置的刚柔耦合虚拟样机模型。并以船舶5级海况下横摇运动作为分析工况,分析比较了刚性体模型仿真分析结果与刚柔耦合模型仿真分析结果,得到了调整驱动齿轮与齿条之间间隙的合理参数。
     分析表明,对于复杂机构,尤其像本文中所涉及的不方便进行物理样机试验的机构,必须采用虚拟样机技术,构建虚拟样机模型,对模型进行虚拟仿真分析。对于柔性比较大的零件,必须将其柔性化,建立刚柔耦合模型进行仿真分析。本文为虚拟样机分析,探索了一条可行的方法,也为以后更复杂的虚拟样机模型建模奠定了基础。
The development and application of the computers and related technology provides a practical way for virtual prototype mechanical system. Virtual prototyping technology can solve many difficult issues such as the design, manufacture and use of mechanical system. And they provide important analysis methods for ensuring the accuracy and reliability of mechanical systems. Virtual prototyping technology is widely used in mechanical system design and analysis.
     This thesis mainly studies on a ship-borne device. It uses multi-body dynamics theory, 3-D modeling software and multi-body system dynamics simulation software, establishes a rigid virtual prototype model for the ship-borne device. This thesis analyzes a ship-borne device's parameter in different sea-conditions and different working environments. The ship-borne device characteristics and dynamic parameters of movement for further analysis of the orbit provides a stress-strain data, as well as amendments ship-borne devices and improving the design of a basis. Though the multi-body dynamics analysis of ship-borne devices, we obtain the contact forces of main interfaces. Using the contact forces as input, we obtain the orbits'stress-strain though finite element static structural analysis. According to orbits'deformation, we propose to increase the horizontal wheel, reducing horizontal deformation of the orbits for security.
     In order to get more accurately result, the paper using flexible multi-body dynamics theory, the use of multi-body dynamics simulation software for flexible analysis. Through modal neutral document we can replace the rigid body for flexible body. We make the flexible model of horizontal wheel support plates and establish the ship rigid-flexible coupling device virtual prototype model. After taking ship five rolling for example, comparing the simulation results of rigid model with rigid-flexible coupling model, we get the proposal that adjust the clearance of the gear and rack.
     The analysis show that, for complex devices, particularly as this can not be involved in the physical prototype testing agencies, must adopt virtual prototyping technology and to establish a virtual prototype model for virtual simulation analysis. For some flexible parts, they must be flexible and establish rigid-flexible coupling model for simulation analysis. This paper explores a feasible method for virtual prototype analysis, as well as lays a foundation for more complex virtual prototype model.
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