工艺系统刚度产生的误差原理与分析

根据对工艺系统受力变形的分析 ,阐述了工艺系统刚度对零件加工精度的影响 ,并简要提出了提高工艺系统刚度的办法     

Flexural and Shear Rigidity of Composite Sheet Piles

The flexural and shear rigidity of pultruded composite sheet pile panels consisting of E-glass fiber-reinforced polyester are studied in this paper. The analysis consists of an experimental investigation and an analytical modeling to determine the resistance of the sheet pile panels to the deflections for design of composite sheet pile walls. Timoshenko’s beam theory was used to experimentally determine the flexural rigidity (EI) and shear rigidity (kAG) of the panel. Three- and four-point bending tests were performed on six different span lengths and the results were self-compared from the two independent tests. Analytical expressions for the flexural and shear rigidities were derived to allow the prediction based on the layered structure of pultruded shapes. The values computed from the analytical expressions were examined with the experimental results.     

滑轨升降拉钢台架的结构、强度、钢度分析

介绍了攀钢轨梁厂钢轨收集装置——滑轨升降式拉钢台架的结构,并计算了主要受力构件滑轨的强度和刚度。     

Manipulability of leader–follower networks with the rigid-link approximation

This paper introduces the notion of manipulability to mobile, multi-agent networks as a tool to analyze the instantaneous effectiveness of injecting control inputs at certain, so-called leader nodes in the network. Effectiveness is interpreted to characterize how the movements of the leader nodes translate into responses among the remaining follower nodes. This notion of effectiveness is a function of the interaction topologies, the agent configurations, and the particular choice of inputs used to influence the network. In fact, classic manipulability is an index used in robotics to analyze the singularity and efficiency of configurations of robot-arm manipulators. To define similar notions for leader–follower networks, we use a rigid-link approximation of the follower dynamics and, under this assumption, we prove that the instantaneous follower velocities can be uniquely determined from that of the leaders’, which allows us to define a meaningful and computable manipulability index for the leader–follower networks. This paper examines the property of the proposed index in simulation and with real mobile robots, and demonstrates how the index can be used to find effective interaction topologies.     

SCS—30B型电子地上衡的结构分析与计算

本文建立了电子地上衡称体的力学模型，对传感器规格的选择进行了理论计算，通过称体结构分析与计算为工厂电子地上衡设计提供了理论依据。     

大长径比高刚性碳纤维杆缠绕成型工艺研究

作为应用于浮空器领域的雷达结构杆件,长达12 m,直径为30 mm,长径比为400∶1。为达到其高刚性、轻质、快速组装的要求,在研制过程中采用了分段杆套管连接方式;分段杆端头变厚度缠绕加强;多角度缠绕角交叉缠绕;干法缠绕碳纤维预浸丝等工艺手段,研制出大长径比高刚性轻质碳纤维结构杆。     

波纹管换热器若干设计问题的分析

通过对波纹管换热器设计过程中遇到的一系列有别于普通列管换热器的技术问题,如管板设计计算、膨胀节的设置分析、折流板间距与厚度、波纹管的稳定性以及技术要求等结构设计计算与使用要求问题进行分析,得到了较为完整的一套波纹管换热器的结构设计方法。     

基于有限元分析的汽车同步器齿套倒锥刀具安全校核

为了解决汽车同步器齿套的倒锥部分的表面加工问题,本文在分析传统加工缺陷的基础上,针对专用的摆线数控机床,从功能和结构上设计了加工倒锥部位的刀具.通过有限元对其进行强度、刚度及动力学模态的分析,并进行了安全校核.理论和实践证明该刀具是适用的.     

井状筋移动工作台静刚度分析及优化设计

首先利用有限元分析的方法对井状筋式和整板式移动工作台两种典型结构进行了静刚度分析及比较.然后对井状筋移动工作台进行了优化设计.并将井状筋移动工作台放在机身上进行整体分析,比较了单个分析与整体分析的异同.     

客车车骨架有限元建模技术及结果分析

对于客车身骨架类的框架结构，用梁单元建模不仅具有建模简单、计算量小的优点，而且通过一些建模技术，精度能很好地满足工程要求。以某集团的CJ6121GCHK型客车车身骨架为例来阐述框架结构的梁单元建模技术及结果分析技术，通过一些模型简化措施，建立并简化了梁单元模型；采用短梁单元对其连接区域进行模拟，提高了框架结构梁单元的建模精度；通过不同典型工况下结构的强度、刚度性能较核，进行了结果分析，提出了对该客车车身骨架进行结构粗略修改的依据。