铸件结构设计准则（三）

铸件的结构设计对铸件的制造成本、铸件的质量有决定性的影响。本文从结构设计的角度，系统地探讨如何保证或提高铸件的质量，减低铸件的制造成本。针对机械设计师的工作特点，从剖析大量不合理的实际结构中提出了１０条铸件结构设计准则，为便于对所述设计准则的理解掌握，还列举了大量典型工程结构。铸件结构设计准则是作者创立的机械结构设计准则系统中的一个专题。     

遵循力学原理的结构设计准则（2）

本文提出八条结构设计准则。用直观的结构概念来描述抽象的力学原理，有助于机械设计师在设计过程中方便地按力学原理进行结构设计。     

书讯

机械设计师职场必备林宋等编著邮购价格:58元本书针对机械设计师在实际工作中需要具备的基础知识和素质,主要介绍了机械设计中常用的工程制图、机械结构、公差配合、材料选择、技术测量、制造工艺,并结合真实的案例图片和文字说明来介绍产品的设计与制造的全部流程。主要帮助青年机械     

书讯

机械设计师职场必备林宋等编著邮购价格:58.00元本书针对机械设计师在实际工作中需要具备的基础知识和素质,主要介绍了机械设计中常用的工程制图、机械结构、公差配合、材料选择、技术测量、制造工艺,并结合真实的案例图片和文字说明来介绍产品的设计与制造的全部流程。主要帮助青年机械     

符合公差原则的结构设计准则（五）

符合公差原则的结构设计准则（五）杨文彬（南京化工大学）１引言加工零部件的过程中，由于种种因素的影响，零部件各部分的尺寸、形状、方向和位置以及表面粗糙度等几何量不可能达到理想状态，总是有或大或小的误差。这一事实决定了机械设计师在设计任何一台机器时，除了...     

焊接结构设计准则（四）

焊接结构设计准则（四）杨文彬（南京化工大学）１引言焊接结构是机械结构中最常见的形式之一，它有很多优点，例如，和铸造结构相比，焊接结构重量轻，结构设计自由度大；因不需制模，故制造周期短，成本低，小批量生产时，这一优点更为突出；和铆接、螺栓联接结构相比，...     

结构设计准则系统：（一）

引进了结构设计准则概念，创立了结构设计准则方法，阐述了建立结构设计准则系统的目的、意义和方法，简介了作者已创立的一个由约２００条结构设计准则、３００个结构实例组成的结构设计准则系统，指出设计准则作为一种简单、概括、可操作性强的建设性知识，其在工程设计实践中的作用是很大的。     

刚性高速转子的设计理论与方法

本文针对刚性转子在高转速工况时所具有的特殊问题，建立在转子动力学、陀螺力学等基本理论基础上，提出了使工程实际中应用的刚性转子适应高转速的有效措施和结构设计准则。     

机械结构轻量化方法简析

现代机械结构设计领域中,机械结构轻量化越来越受到人们的重视,在满足工程要求的情况下设计更加轻量化的机械结构成为结构设计的发展新方向。本文主要阐述了2种可以使机械结构轻量化的方法:拓扑优化、点阵结构。并举例说明其在航空航天和汽车领域中的应用,并展望以后的发展。     

刚性高速转子的设计理论与方法

本文针对刚性转子在高转速工况时所具有的特殊问题，建立在转子动力学、陀螺力学等基本理论基础上，提出了使工程实际中应用的刚性转子适应高转速的有效措施和结构设计准则。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....