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CAD/CAPP/CAM集成系统的研究与开发

魏而巍,梁木养,杨平

《中国工程科学》 2000年第2卷第4期页码 59-63

摘要：

文章介绍了可实用的CAD/CAPP/CAM集成系统。该系统是由机械产品设计人员，工艺人员和数控机床NC编程人员共同努力，在商品CAD/CAM软件Pro/ENGINEER平台上开发的。系统由三个子系统组成：零件信息识别子系统，CAPP子系统和自动CAM子系统。自动CAM子系统根据CAPP的结果，自动生成Pro/ENGINEER的NC工步，经过NC仿真后生成零件加工的刀位文件，再经过NC后处理生成NC代码。

关键词： CAD CAPP CAM 特征识别

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Selecting and prioritizing key factors for CAD/CAM software in small- and medium-sized enterprises using

Ghulam ZAKRIA, Zailin GUAN, Yasser RIAZ, Mirza JAHANZAIB, Anwar KHAN,

《机械工程前沿（英文）》 2010年第5卷第2期页码 157-164 doi: 10.1007/s11465-010-0017-x

摘要： In today’s fast-paced world, computer-aided design/computer-aided manufacturing (CAD/CAM) systems have become a necessary element in manufacturing industries. Prior to investment in a CAD/CAM system, it is essential for investor to know how to maximize their benefits from buying a new or by changing an existing CAD/CAM system. The purpose of this study is to provide a methodology to assist small- and medium-sized manufacturing companies of Pakistan in selecting a CAD/CAM system. It will also facilitate the software providers in recognizing the current state of affairs as well as preceding problems regarding the application of CAD/CAM in manufacturing firms when assisting them in choosing the direction for future development simultaneously. To accomplish this purpose, data have been collected about current CAD/CAM systems. Important criteria for system selection and parameters for evaluation have also been identified and prioritized. Analytic hierarchy process (AHP) is used as a decision-making technique for identifying and prioritizing important factors for CAD/CAM software selection. Expert Choice (AHP-based software) has been used to validate the results.

关键词： computer-aided design (CAD) computer-aided manufacturing(CAM) SMEs analytical hierarchal approach Expert Choice

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CNC programming system for complex components based on KBE within integrated environment of CAD/CAPP/CAM

Shengwen ZHANG, Guicheng WANG, Liang ZHANG, Xifeng FANG

《机械工程前沿（英文）》 2009年第4卷第1期页码 97-102 doi: 10.1007/s11465-009-0007-z

摘要： To promote the research and development of modern digital and intelligent manufacturing technology and overcome shortcomings of computerized numerical control(CNC) programming for complex components, an innovative idea has been proposed to introduce knowledge based engineering (KBE) into the field of CNC programming within the integrated environment of CAD/CAPP/CAM. This paper constructs the architecture of CNC programming based on KBE within CAD/CAPP/CAM and explores the key technology of applying KBE to CNC programming — knowledge representation, knowledge acquisition, knowledge reasoning, and generalized knowledge base system of CNC programming. The integration of the CAD/CAM system and the CAPP system of enterprises has been achieved by taking the powerful CAD/CAM system of UG NX as a platform. The prototype system of CNC programming for complex components based on KBE within CAD/CAPP/CAM has been developed by means of UG/Open,VC++6.0, and SQL Sever 2000. Finally, a frame example, one of the complex components of a marine diesel, is presented, and the academic production and the intelligence of the system are verified.

关键词： NC programming CAD/CAPP/CAM KBE

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An intersection algorithm based on transformation

CHEN Xiao-xia, YONG Jun-hai, CHEN Yu-jian

《机械工程前沿（英文）》 2006年第1卷第3期页码 364-369 doi: 10.1007/s11465-006-0024-0

摘要： How to obtain intersection of curves and surfaces is a fundamental problem in many areas such as computer graphics, CAD/CAM, computer animation, and robotics. Especially, how to deal with singular cases, such as tangency or superposi

关键词： intersection superposi animation fundamental CAD/CAM

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Optimal design of a linkage–cam mechanism-based redundantly actuated parallel manipulator

《机械工程前沿（英文）》 2021年第16卷第3期页码 451-467 doi: 10.1007/s11465-021-0634-6

摘要： A redundantly actuated parallel manipulator (RAPM) with mixed translational and rotational degrees of freedom (DOFs) is challenged for its dimensionally homogeneous Jacobian modeling and optimal design of architecture. In this paper, a means to achieve redundant actuation by adding kinematic constraints is introduced, which reduces the DOFs of the end-effector (EE). A generic dimensionally homogeneous Jacobian is developed for this type of RAPMs, which maps the generalized velocities of three points on the EE to the joint velocities. A new optimization algorithm derived from this dimensionally homogeneous Jacobian is proposed for the optimal design of this type of RAPMs. As an example, this paper presents a spatial RAPM involving linkages and cam mechanisms. This RAPM has 4 DOFs and 6 translational actuations. The linkage lengths and the position of the universal joints of the RAPM are optimized based on the dimensionally homogeneous Jacobian.

关键词： redundant actuation parallel manipulator linkage–cam mechanism Jacobian optimal design

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Nonlinear dynamic behaviour of a cam mechanism with oscillating roller follower in presence of profile

Walha LASSAAD, Tounsi MOHAMED, Driss YASSINE, Chaari FAKHER, Fakhfakh TAHER, Haddar MOHAMED

《机械工程前沿（英文）》 2013年第8卷第2期页码 127-136 doi: 10.1007/s11465-013-0254-x

摘要：

In this paper we investigate the nonlinear dynamic behaviour of a cam mechanism with oscillating roller follower in presence of defects. The nonlinear developed lumped-mass model includes eight degrees of freedom with two nonlinear hertzian contacts. The first one is located between cam and first roller while the second is between second roller and the sliding rod. The nonlinear dynamic behaviour is described by second order differential equations which are resolved by using the implicit Newmark algorithm combined with the Newton-Raphson iterative scheme. The influence of the cam profile error on the dynamic behaviour is also investigated.

关键词： cam nonlinear behaviour oscillating roller follower profile error

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基于4D CAD的大型桥梁施工进度系统仿真研究

张正峰,付金强,吴康新,张发瑜

《中国工程科学》 2006年第8卷第1期页码 63-66

摘要：将面向对象的复杂工程系统仿真方法与CAD数字建模方法相结合，将桥梁的3D整体模型和施工进度相链接，提出了基于4D CAD的桥梁施工系统仿真思想，使施工过程的动态可视化与直观分析优化后的施工进度成为可能。以Visual C++作为仿真平台，设计编制了桥梁施工4D CAD可视化仿真软件。研究成果在某斜拉桥工程施工组织设计中得到成功应用，验证了基于4D CAD的大型桥梁可视化仿真方法在斜拉桥施工进度分析与优化方面的实用性和优越性。

关键词：施工进度系统仿真 4D CAD 斜拉桥

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Principle and curve of planetary indexing cam mechanisms

LIU Ming-tao, ZHANG Ce, YANG Yu-hu

《机械工程前沿（英文）》 2006年第1卷第4期页码 475-478 doi: 10.1007/s11465-006-0063-6

摘要： A new type of planetary indexing cam mechanism called type !c is presented. The transmission principle of type !c is discussed. Based on the principle of formation of conjugate tooth contour, the equations of the cam s pitch curve are derived. The continuity and symmetry of the cam s pitch curve are also analyzed. It can be concluded that: 1) This type has no output institution so the output precision can be improved; 2) The asymmetrical two-ring structure is used to overcome dead point and its phase angle is equal to (π - 2π/n); 3) The continuous condition of the cam s pitch curve is that the average transmission ratio is -n in an intermittent motion period.

关键词： continuity planetary average transmission symmetry intermittent

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一种面向CAD装配模型具有完整性校验的新型属性加密方法 Article

杨月婷, 何发智, Soonhung Han, 梁亚倩, 程媛

《工程（英文）》 2021年第7卷第6期页码 787-797 doi: 10.1016/j.eng.2021.03.011

摘要：本文提出了一种新的基于属性的计算机辅助设计（CAD）装配模型加密方法，有效地支持云制造中协同设计场景的层次访问控制、完整性验证和变形保护。设计了装配层次访问树（AHAT）作为层次访问结构。部件密文（ACT）文件中包含与属性相关的密文元素，其适用于内容密钥解密而不是CAD装配体文件。我们修改原始的默克尔树（MT）并重建装配体MT。所提出的ABE框架具有将变形保护方法与CAD模型的内容保密性相结合的能力。在标准假设下，所提出的加密方案被证明是安全的。在典型的CAD装配模型上进行的实验仿真表明，该方法在应用中是可行的。

关键词：信息安全云设计和云制造协同设计 CAD 装配模型基于属性的加密

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Optimal localization of complex surfaces in CAD-based inspection

XU Jinting, LIU Weijun, SUN Yuwen

《机械工程前沿（英文）》 2008年第3卷第4期页码 426-433 doi: 10.1007/s11465-008-0068-4

摘要： Complex surface inspection requires the optimal localization of the measured surface related to the design surface so that the two surfaces can be compared in a common coordinate frame. This paper presents a new technique for solving the localization problem. The basic approach consists of two steps: 1) rough localization of the measured points to the design surface based on curvature features, which can produce a good initial estimate for the optimal localization; 2) fine localization based on the least-square principle so that the deviation between the measured surface and the design surface is minimized. To efficiently compute the closest points on the design surface of the measured points, a novel method is proposed. Since this approach does not involve an iterative process of solving non-linear equations for the closest points, it is more convenient and robust. The typical complex surface is used to test the developed algorithm. Analysis and comparison of experimental results demonstrate the validity and applicability of the algorithm.

关键词： deviation comparison non-linear localization inspection

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the improvement design of dynamic characteristics for the roller follower of a variable-speed plate cam

Hui Ching FAN, Hong Sen YAN

《机械工程前沿（英文）》 2012年第7卷第1期页码 5-15 doi: 10.1007/s11465-012-0310-y

摘要：

Without modifying the cam contour, a cam mechanism with a variable input speed trajectory offers an alternative solution to flexibly achieve kinematic and dynamic characteristics, and then decrease the follower’s residual vibration. Firstly, the speed trajectory of cam is derived by employing Bezier curve, and motion continuity conditions are investigated. Then the motion characteristics between the plate cam and its roller follower are derived. To analyze the residual vibration, a single degree of freedom dynamic model of the elastic cam-follower system is introduced. Based on the motion equation derived from the dynamic model, the residual vibration of the follower is yielded. The design procedure to improve the kinematic and dynamic motion characteristics is presented and two design examples with discussions are provided. Finally, the simulations of the kinematic and dynamic models by ADAMS are carried out and verified that the design models as well as the performances of the mechanism are feasible.

关键词： cam mechanism variable input speed kinematic design dynamic design optimal design

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机械产品可拓概念设计研究

赵燕伟

《中国工程科学》 2001年第3卷第5期页码 67-71

摘要：

文章在总结现有智能化概念设计思维规律的基础上，提出基于可拓方法的机械产品智能化概念设计的研究内容、特点、流程与方法。围绕智能化概念设计的功能表达、功能分解与综合、功能推理与决策，重点研究功能-原理-布局-结构的可拓化概念设计方法和计算机模拟人类解决问题的辩证思维过程。文中给出可拓方法在加工中心刀库概念设计中的应用实例。该方法对于解决目前智能化概念设计理论研究与工程实现中的瓶颈问题，具有重要意义。

关键词：概念设计机械产品智能CAD 可拓学

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Influence of temperature on cam-tappet lubrication in an internal combustion engine

CHANG Qiuying, YANG Peiran, WANG Jing, CHEN Quanshi

《机械工程前沿（英文）》 2007年第2卷第4期页码 489-492 doi: 10.1007/s11465-007-0085-8

摘要： The transient thermo-elastohydrodynamic (TEHL) lubrication simulation and isothermal elastohydrodynamic (EHL) simulation were performed on the exhausting cam-tappet friction pair of an internal combustion engine. Although by employing the two models the center pressure, the thickness of the lubricant film and friction coefficient obtained were similar in the changing trend during a rotating cycle, the parameters make a great difference, especially for the thickness of the lubricant film; the TEHL was four times thicker than the EHL. These results show that the temperature should not be neglected in the study of the lubrication of cam-tappet pairs.

关键词： coefficient combustion isothermal elastohydrodynamic temperature thickness

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从计算机辅助设计到人辅助设计——一种等几何拓扑优化方法

王英俊, 肖蜜, 夏兆辉, 李培根, 高亮

《工程（英文）》 2023年第22卷第3期页码 94-105 doi: 10.1016/j.eng.2022.07.013

摘要：

本文提出了一种新的设计模式——人辅助设计，以取代传统的计算机辅助设计。在人辅助设计中，计算机可以通过一种新的等几何拓扑优化自动完成整个产品设计，而人类仅需协助轻微修改设计以满足要求。文中提出了一种嵌入域等几何拓扑优化用于设计具有不规则设计域的复杂模型，并且可以基于分层等几何拓扑优化结果自动生成优化结果的可编辑几何模型。测试了三个算例以验证所提出的等几何拓扑优化模式，包括一个具有规则设计域的3D悬臂梁，一个具有不规则设计域的汽车零件和一个具有多尺度结构的MBB梁。结果表明，所提出的等几何拓扑优化模式可以自动生成高质量的优化模型。因此，该技术具有成为革命性技术的巨大潜力，可以将当前设计模式由计算机辅助设计转变为人辅助设计。

关键词：人辅助设计 CAD/CAE一体化等几何分析结构优化等几何拓扑优化

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过程强化装置中双偏心转子的运动分析

朱瑞林,朱国林

《中国工程科学》 2012年第14卷第10期页码 90-96

摘要：

当偏心转子绕定轴旋转时，实际上只有其几何圆心作简谐振动（正/余弦运动），某些情况下由转子驱动的构件（如活塞）并不能作同样的简谐振动，因此在一些过程设备上应用双偏心转子时，会引起一些相关问题，如压力变化问题。为此，在分析一种过程强化装置中所采用的双偏心转子的运动规律的基础上，发现了由于偏心转子所驱动的两活塞的运动不完全对称，可能引起设备内介质压力变化的原因，并提出了相应的解决措施。

关键词：转子活塞简谐振动