共查询到20条相似文献,搜索用时 15 毫秒
1.
Radial and thrust loading characteristics are given for both single row entry and double row entry bearings. The design data presented gives a basis for comparison of the two bearing configurations. The paper shows that the double entry configuration reduces the negative stiffness regions which occur in single entry bearings. Finally a procedure is given to enable the designer to select a bearing to meet his particular requirements. 相似文献
2.
3.
4.
5.
Davood Shishebori Iman Dayarian Armin Jabbarzadeh Farnaz Barzinpour 《The International Journal of Advanced Manufacturing Technology》2014,71(1-4):127-139
Locating certain facilities in predetermined sites is named the multiple facility location problems (MFLP). The objective of these kinds of problems is locating facilities to serve a given set of customers so that candidate sites and requirements are known. When the new facility sites have to be selected from a given set of candidate sites, the mentioned location problem becomes a discrete multiple facility location problem (DMFLP). In this paper, a special approach of DMFLP is considered where different multiple facilities have to be placed (location decision) and also customers have to be assigned to these facilities (allocation or assignment). The mathematical model of the proposed problem is developed, and with respect to the complexity of solving the mathematical model, especially in large scale, a new hybrid approach is proposed based on tabu search algorithm to solve the problem at each scale. Computational results on several randomly generated problems in comparison with a new proposed lower bound obtained from Lagrangian relaxation indicate that the proposed hybrid approach is both accurate and efficient. 相似文献
6.
用于DFM的工艺咨询与评价方法的研究 总被引:1,自引:0,他引:1
分析了CD/DFM对工艺咨询与评价信息的需求,认为实现并行设计的关键是研究和开发用于DFM的计算机辅助工艺咨询与评价系统。介绍了该系统的总体结构、功能与信息需求,提出了工艺咨询与评价等新的方法。 相似文献
7.
8.
本文就无人驾驶飞机上装载的航空照相设备的曝光量自动控制装置的设计问题,进行了理论的分析,提出了无人机载照相设备自动调光装置设计的基本要求,并给出一种新型航空相机自动调光机构的设计做为实例加以说明。 相似文献
9.
10.
11.
面向质量目标的统计公差的表达方式及应用分析 总被引:4,自引:0,他引:4
介绍了统计公差及其标准化的国内外概况,论述了面向质量目标的统计公差及表达方式,总结了这种统计公差技术可满足控制功能和并行设计需求的三个层次的统计公差定量要求,为质量指标的选择、统计质量控制图及其参数设计、保证给定置信度和控制目标的抽样方案提供了并行设计所需要的标准化的系统方法、电子图表和解决方案。在和现有标准对比的基础上,指出这种统计公差技术功能上的拓展、内涵的深化和创新将使其成为指导统计过程控制、保证预期质量目标的不可缺少的界面。 相似文献
12.
This paper describes a new method for choosing a distribution law from a given set of experimental data that provides the best fit to a measured random variable. The method is based on a comparison of empirical distributions constructed for the original sample with the set of given laws using a continuous mapping of the distribution function onto the interval [0, 1]. As a result, the distribution for which the corresponding value of the functional is maximal is taken as the most probable distribution law for the original sample. Examples of implementing the method using statistical Monte Carlo simulation are given. 相似文献
13.
14.
15.
基于有向图的活动序列比较及其在装配序列评判中的应用 总被引:1,自引:0,他引:1
在分析活动序列内涵的基础上,提出了用于描述活动序列及评价指标参考序列的两个模型--完全AOV网和扩展AOV网,给出了一种基于有向图的活动序列相似度的计算方法,实现了工程任务安排决策中活动序列方案对各评价指标满足程度的量化计算.在装配序列规划中的应用实例表明,该方法较好地解决了工程任务安排决策中方案的自动评价与选择问题. 相似文献
16.
17.
18.
19.
设计一种基于反螺旋理论的系统方法,给出了具有三个转动自由度的并联机器人的设计要求。分析了产生平台奇异时三条支链所提供的反螺旋的线性关系,利用三条支链对平台所提供的特殊约束,避免设计位形下发生平台奇异现象。给出了设计该类结构的运动副组成类型和空间放置原则。 相似文献
20.
在形位公差国标的贯彻中,形位误差的精确测量是一项很重要的工作。目前,测量圆度的仪器主要有圆度仪,而测量圆柱度和同轴度还没有专用的测量设备,配有电子计算机进行数据处理的也很少见。本文的目的是提供一种圆度、圆柱度和同轴度的测量原理和用于电子计算机的线性数据处理的解析方法为设计新的专用测量设备用的。这样,与通用测量设备相比可以进一步提高测量的精度和效率。由于圆度测量及数据处理是上述三种项目测量的基础,因此本文以圆度的测量及数据处理的解析方法作为重点加以介绍,同时对被测零件的安装精度提出了要求。 相似文献