共查询到19条相似文献,搜索用时 78 毫秒
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为了缩短船用螺旋桨的再设计周期,降低再设计难度,针对船用螺旋桨提出了一种基于逆向设计软件Geomagic Design X和三维建模软件UG的逆向建模方法。详细介绍了螺旋桨的逆向建模过程和主要操作流程,通过比较放样和面片拟合生成叶片NURBS曲面的方法和原理,得到一种合适的叶片曲面作为叶片重构的基础。采用Geomagic Quality软件对螺旋桨进行整体精度分析,结果发现螺旋桨重构模型和螺旋桨点云数据之间的偏差在允许范围之内,验证了此螺旋桨逆向建模方法的可行性,同时为类似的逆向建模提供了思路。 相似文献
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本文以离心泵叶轮为例,详细介绍了逆向工程技术在复杂型面零件三维建模中的应用,文章包含了逆向造型的点云采集、模型重构、优化处理以及偏差检验的全部过程。通过实验对逆向工程技术应用于复杂型面的三维数模重构进行了深入的探索和研究,为类似复杂型面零件的造型提供了很好的思路。 相似文献
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船用螺旋桨形状复杂,为满足快速、精确建模的要求,提出一种基于VB.NET编程语言的螺旋桨三维自动建模方法。基于桨叶切面基础数据,推导桨叶型值点数学转换公式。利用Excel完成桨叶切面基础数据和桨毂数据的存储与读取。研究螺旋桨建模方法,对CATIA进行二次开发,集成型值点导入、曲面建模、实体填充等建模流程。基于VB.NET语言将上述操作程序化,设计界面友好的螺旋桨自动建模软件。利用该软件完成桨叶的自动建模,并进行光顺性检查和模态分析。这里建立的螺旋桨自动建模方法简单高效,能够避免传统几何建模方法的手工操作量大、易出错的缺点。 相似文献
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邓海英 《机械工人(冷加工)》2013,(22):69-71
螺旋桨叶轮是实现船舶推进的重要零件,由桨叶和浆毂组成。通常叶片的型面数据是依据非定常三维黏性流体模型进行复杂的数值计算,并经试验修正后得到的。 相似文献
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并联机床加工船用螺旋桨及CAM技术研究 总被引:2,自引:0,他引:2
主要研究用并联机床加工整体式船用螺旋桨的技术以及用CAD/CAM系统进行螺旋桨辅助加工的方法。研究了并联机床加工螺旋桨的工艺方案,提出了加工螺旋桨的并串联多轴数控加工系统,分析了螺旋桨数控加工的工艺过程;介绍了在UG/CAM环境下进行螺旋桨加工的刀具轨迹编程和用Vericut加工仿真系统进行加工仿真的方法和过程;并进行加工实验。用于加工螺旋桨的并联机床具有结构简单,造价低和占地面积小等优点,具有广泛的应用价值和发展前景。 相似文献
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Jung-Whan Park Jung-Geun Lee Cha-Soo Jun 《International Journal of Precision Engineering and Manufacturing》2009,10(4):5-12
We present an optimal cutter location (CL) data computation for face-milling of large marine propellers composed of CL point
optimization and CL path optimization on a given tool path. The CL point optimization at a single cutter contact (CC) point
is conducted by maximizing the effective radius of the face milling cutter, while the CL path optimization on a series of
CC points is performed by conforming deviation of the tool-swept surface from the design surface between consecutive CL data
to a given machining tolerance. The proposed algorithm was implemented and applied to the machining of a large marine propeller
which proved effective from a quantitative point of view, and is used on the shop floor in a Korean ship building company. 相似文献
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Cavitating flow around two marine propellers with different skew angles, a conventional propeller (CP) and a highly skewed propeller (HSP), operating in the non-uniform wake was simulated using a mass transfer cavitation model and the k-omega SST turbulence model. The numerical model reasonably predicted experimental data for the unsteady cavitation patterns as well as the oscillation amplitudes of the dominant pressure components. The results indicate that the effect of skew angle is very important on the cavitation characteristics as well as the pressure fluctuations and that the amplitudes of pressure fluctuations for the HSP are 50~70% less than that for the CP. Therefore, the skewed propeller will reduce noise and vibration compared to the conventional propeller. Furthermore, the numerical model verified the relation between the hull pressures and changing cavitation patterns as the blades sweep through the high wake region. The results demonstrate that volumetric acceleration of entire cavity around a propeller blade is the main reason for the pressure fluctuations, which agrees with previous experiments. 相似文献
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Cheol-Soo Lee Jae-Hyun Lee 《The International Journal of Advanced Manufacturing Technology》2010,50(1-4):253-263
A model propeller plays important roles in the design of the marine vehicles. The cavitations, the erosion, the pressure fluctuation, and the flow are measured by the model propeller. These measurements help to create the actual marine propeller. In this paper, geometry modeling and tool path generation for a model propeller are proposed, and the hub surface and lateral surface of the wing surfaces are generated by the proposed method. Considering the characteristics of the model propeller, efficient Cutter Location (CL) data are proposed: (1) the finish machining is completed with one setup posture. (2) A four-axis machining algorithm is proposed that makes it possible to the propeller with one setup and that minimizes machining error. (3) To minimize the maximum machining load, zigzag machining and an outside-to-inside tool path are introduced. A tilting guide curve is proposed to determine the tool axis vector. A smoothly changing tool axis vector is obtained through this curve, and the calculation is simple and fast. The results demonstrate that the proposed method is useful for the manufacturing of model propellers. 相似文献
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在对等螺距三叶螺旋桨零件图纸进行识读分析的基础上,本文探讨了其桨叶曲面模型的CAD构建方法,并就螺旋桨桨叶曲面的数据检测项目进行了解析,可用于指导螺旋桨桨叶曲面的加工。 相似文献
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逆向工程(Reverse Engineering)是近年来CAD领域最热门的研究方向之一,是一种产品的再设计和超越过程.根据米老鼠模型,运用逆向工程的方法,使用三坐标测量技术和UGS公司Imageware逆向工程软件完成米老鼠凸模的逆向三维造型设计,运用MasterCAM软件完成该模型的三维数控加工的程序编制,经实体验证、仿真加工确保无误后,进行后处理,生成数控加工代码,在立式加工中心完成模型的复杂空间曲面数控加工,体现了三维数控加工的先进性,在工程实际中具有一定的指导和借鉴意义. 相似文献
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大克令吊在下放重物过程中,电动机转速大于同步转速,处于回馈发电状态,如果回馈功率过大,将会对电网造成影响,阐述了如何吸收吊机回馈的逆功率措施。 相似文献
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薄文波 《气象水文海洋仪器》2009,26(3):1-5
本文通过对不同航行状态下,安装于不同位置的风传感器的试验与分析,得出安装在桅杆两侧的风传感器在船体直线航行和转向航行时风速、风向的测量值均受到船体桅杆的影响,影响程度与风向和船向夹角有关。 相似文献
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用专业逆向工程软件Imageware对发动机增压叶轮进行逆向建模,研究发现可用投影法和旋转叠加法将规律的叶片点云和叶轮回转面点云处理成相切圆弧线,并以线构面。同时,通过误差分析控制所构曲面充分逼近实物数据,再将Imageware与UG结合构建实物三维模型。 相似文献