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1.
针对数字电路中非鲁棒路径时滞故障测试时间长,故障覆盖率较低的问题,提出了人工蜂群优化的测试生成算法。该算法首先应用电路转换法则把数字电路转换成为其等效电路,然后用Hopfield神经网络构建等效电路单固定故障的约束电路,并得到能量函数,再应用人工蜂群优化算法计算能量函数的最小值以得到等效电路单固定故障的测试矢量,最后根据对应关系得到原电路非鲁棒路径时滞故障的测试矢量对。在ISCAS’85国际标准电路上的实验结果表明该算法故障覆盖率能够达到98%,并且平均测试生成时间明显减小。  相似文献   

2.
针对数字电路多固定故障测试生成故障覆盖率低和平均测试生成时间长的问题,提出了人工蜂群和神经网络优化的数字电路多固定故障测试生成算法。该算法首先通过等效的方法得到多固定故障的单固定故障模型,再使用Hopfield二值神经网络的方法得到单固定故障的约束电路模型,最后使用人工蜂群优化方法求解故障约束电路接口电路的能量函数的零值点获得原电路的多固定故障的测试生成矢量。实验结果(在ISCAS’85国际标准测试电路上)表明该算法的故障覆盖率可达98.5%以上,平均测试生成时间小于0.25μs。  相似文献   

3.
为了改善组合电路测试生成效率,提出了一种有效的基于三值神经网络的组合电路测试生成算法。该算法不需要传播和回溯,而是使用三值神经网络把组合电路表示为双向神经元网络,并构建网络的能量函数,最后使用遗传算法求出全局最小值点作为电路的测试矢量,所以组合电路的测试生成问题转换为优化问题。在标准电路上的测试实验结果表明该算法具有较高的故障覆盖率和较短的测试生成时间。  相似文献   

4.
提出了一种有效的串扰时滞故障测试生成算法,该算法使用了三值神经网络理论和混沌搜索方法。首先在电路的受害点处把电路分成两个部分,对第一部分,可以得到时滞时间表达式;对第二部分,使用混沌搜索和三值神经网络网络的方法把故障传播到输出端。最后,能够把故障传播到输出端且使时滞时间表达式取最大值的输入矢量就是串扰时滞故障的最优测试矢量。实验结果表明该算法能够容易地得到故障输入测试矢量,平均测试生成时间小于0. 25μs,故障覆盖率能够达到98. 2%。  相似文献   

5.
提出了一种有效的串扰时滞故障测试生成算法,该算法使用了三值神经网络理论和混沌搜索方法。首先在电路的受害点处把电路分成两个部分,对第一部分,可以得到时滞时间表达式;对第二部分,使用混沌搜索和三值神经网络网络的方法把故障传播到输出端。最后,能够把故障传播到输出端且使时滞时间表达式取最大值的输入矢量就是串扰时滞故障的最优测试矢量。实验结果表明该算法能够容易地得到故障输入测试矢量,平均测试生成时间小于0. 25μs,故障覆盖率能够达到98. 2%。  相似文献   

6.
提出一种有效的数字电路故障阈值故障测试生成算法。首先构造出数字电路的阈值测试模型,通过这个模型可以区分出可接受故障和不可接受故障,然后使用成熟的固定故障测试生成算法得到不可接受故障的测试生成矢量。在ISCAS’85和ISCAS’89电路上的实验结果表明:该算法的故障覆盖率能达到96%,故障测试生成时间少于0. 019 s。  相似文献   

7.
基于人工蜂群算法的机器人路径规划   总被引:5,自引:0,他引:5  
为求解机器人路径规划问题,引入人工蜂群算法,并将路径空间以网格划分,通过固定起始节点和设定最大允许路径节点数等方法,解决了人工蜂群算法应用于路径规划的两个难题--路径节点不固定和邻域构造困难,实现了将ABC算法应用于路径规划问题.通过典型的实例仿真对算法性能进行测试,结果表明:该算法有效克服了停滞行为的过早出现,而且能够加快收敛速度,得到全局最优解或近似解,是解决机器人路径规划问题的一种有效算法.  相似文献   

8.
针对串联机械臂工作时间最优、能耗最优、脉动最优的轨迹优化问题,提出一种基于改进人工蜂群算法的多目标轨迹优化方法。文中采用5次NURBS曲线插值法建立工作轨迹数学模型,构造高阶连续关节运行轨迹并对其进行合理规划。以串联机械臂运行时间、能量消耗和脉动冲击为目标建立目标函数,通过改进人工蜂群算法进行优化设计并获得Pareto最优解集,运用归一化权重目标函数获取期望解。选择PUMA560串联机械臂进行仿真分析,结果表明:5次NURBS曲线轨迹规划方法有效构造平滑轨迹,改进人工蜂群算法能够实现满足约束条件的多目标优化,验证了算法的有效性,为后续研究奠定基础。  相似文献   

9.
基于人工蜂群算法的双机器人路径规划分析   总被引:1,自引:1,他引:0       下载免费PDF全文
针对手动液压搬运车车架主焊工序双机器人同步焊接路径规划问题,文中引入虚拟点将多旅行商问题转化为单旅行商问题,选用换位表达编码方式对车架焊缝编码,然后采用基于状态转移策略的人工蜂群算法建立双机器人同步焊接数学模型,仿真求解全局最优焊接路径的较好近似解,并与改进的自适应遗传算法以及人工鱼群算法做了仿真对比试验.结果表明,人工蜂群算法不会过早停滞,具有较快收敛速度,较其它两种算法更能缩短焊接工时,基于人工蜂群算法的双机器人路径规划方法能有效解决搬运车车架主焊工序双机器人同步焊接问题.  相似文献   

10.
针对焊接机器人的运动特点及焊接工作过程中焊枪的避障问题,提出基于改进人工蜂群算法的机器人避障焊接路径规划策略。首先针对传统人工蜂群算法存在的问题,将Lévy(莱维)分布引入到人工蜂群算法侦查蜂寻找新蜜源的过程中,代替其原有0~1之间的随机分布过程,形成了基于Lévy飞行的改进型人工蜂群算法,然后将其应用到焊接机器人的路径规划问题中,并进行了仿真实验。结果表明:改进后的方法能够得到最优的焊接避障路径,且寻优速度快、过程稳定。该方法可用于解决焊接机器人避障路径规划问题。  相似文献   

11.
The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.  相似文献   

12.
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.  相似文献   

13.
In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.  相似文献   

14.
After nearly two years' tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry (SRIF), located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.  相似文献   

15.
韩磊 《腐蚀与防护》2015,36(1):84-90,94
综述了常见的电化学噪声数据处理方法,介绍了直流趋势剔除、统计分析、快速傅立叶变换(FFT)法计算功率谱密度(PSD)以及小波变换处理电化学噪声信号的基本过程,并阐释了各种数学处理及所得参数的物理意义。  相似文献   

16.
Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.  相似文献   

17.
正Harbin General Hydraulic Machinery Works Co.,Ltd.of Yilin Hydraulic Group is the most professional production base of large-scale metallurgy oil cylinder and oil machinery cylinder in the Northeast of China.The main products include metallurgy cylinder,swell-shrink cylinder,rotating injection device,lifting cylinder,main lifting jack,front lifting jack,engineering oil cyl-  相似文献   

18.
<正>Copyright Information For Authors As soon as an article is accepted for publication,authors will be requested to assign copyright of the article(or to grant exclusive publication and dissemination rights)to the publisher(respective the owner if other than Springer).This will ensure the widest possible protection and dissemination of information under copyright laws.More information about copyright regulations for this journal is available at  相似文献   

19.
《中国铸造》2014,(6):539-539
The ANKIROS/ANNOFER/TURKCAST shows held on Sept. 11-14, 2014, in Istanbul, Turkey, provided an ideal opportunity for the World Foundry Organization Executive Board to meet and discuss member benefits. Nine executive board members attended the meeting, including Dr. Lou Yanchun, Vice President of FICMES and President of Shenyang Research Institute of Foundry. During the board meeting, the WFO executives agreed to establish a special working group which is responsible for drafting a strategical plan for the WFO and submitting it for discussion at the next board meeting in 2015.  相似文献   

20.
《中国铸造》2014,(5):460-463
The 9th China International Diecasting Congress and the 1st International Symposium on Nonferrous Alloys and Special Casting Technologies (ISNASCT) were successfully held in Shanghai on July 19-22, 2014. Both events were jointly sponsored by Chinese Mechanical Engineering Society, Die Casting Commission of World Foundry Organization and Non-Ferrous Materials Commission of World Foundry Organization, and organized by the Foundry Institution of Chinese Mechanical Engineering Society (FICMES) and China Productivity Promotion Center of Foundry Industry.  相似文献   

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