提升SMT生产线效率的方法和措施

SMT生产线要达到最大的产量，必须要考虑生产线的效率。贴片机是SMT生产线中的关键设备，因此提高贴片机的生产效率具有十分重要的意义。文章以环球贴片机为例，介绍了提高SMT生产线效率的方法和经验，包括PcB工艺设计、生产线平衡、优化、管理措施等，希望对相关工程人员有一定帮助。     

SMT生产线中贴片机平衡优化方法研究

贴片机是SMT生产线中的核心设备,其生产效率的高低直接决定着整条生产线的产出,因此提高其生产效率具有十分重要的意义。根据SMT生产模式以及生产线优化对象的不同,分别从单机优化、线体平衡、归组优化和生产计划优化四个方面进行阐述,着重探讨了SMT生产线中贴片机平衡优化的思想、方法以及经验,并结合具体的案例进行分析。     

SMT生产线负荷分配及平衡研究

要使SMT生产线发挥最大的效率,生产线平衡必然要被考虑。通过负荷的优化分配可以实现生产线的平衡。本文介绍了负荷优化分配的思想、方法和经验。希望对广大工程技术人员提供一些帮助。     

提升SMT生产线效率的方法和措施

SMT生产线要达到最大的产量,必须要考虑生产线的效率。贴片机是SMT生产线中的关键设备,因此提高贴片机的生产效率具有十分重要的意义。本文以环球贴片机为例,介绍了提高SMT生产线效率的方法和经验,包括PCB工艺设计、生产线平衡、优化、管理措施等,希望对相关工程人员有一定帮助。     

提升SMT生产线效率的方法和措施

SMT生产线要达到最大的产量,必须要考虑生产线的效率。贴片机是SMT生产线中的关键设备,因此提高贴片机的生产效率具有十分重要的意义。本文以环球贴片机为例,介绍了提高SMT生产线效率的方法和经验,包括PCB工艺设计、生产线平衡、优化、管理措施等,希望对相关工程人员有一定帮助。     

提升SMT生产线效率的方法和措施

SMT生产线要达到最大的产量,必须要考虑生产线的效率。贴片机是SMT生产线中的关键设备,因此提高贴片机的生产效率具有十分重要的意义。本文以环球贴片机为例,介绍了提高SMT生产线效率的方法和经验,包括PCB工艺设计、生产线平衡、优化、管理措施等,希望对相关工程人员有一定帮助。     

如何提高SMT生产线的效率

SMT生产线要达到最大的产量,必须要考虑生产线的效率。贴片机是SMT生产线中的关键设备,因此提高贴片机的生产效率具有十分重要的意义。本文以环球贴片机为例,介绍了提高SMT生产线效率的方法和经验,包括PCB工艺设计、生产线平衡、优化、管理措施等,希望对相关工程人员有一定帮助。     

如何提高SMT生产线的效率

SMT生产线要达到最大的产量,必须要考虑生产线的效率。贴片机是SMT生产线中的关键设备,因此提高贴片机的生产效率具有十分重要的意义。本文以环球贴片机为例,介绍了各种提高SMT生产线效率的方法和经验,包括PCB工艺设计、生产线平衡、优化、管理措施等,希望对相关工程人员有一定帮助。     

提升SMT生产线效率的方法和措施

SMT生产线要达到最大的产量,必须要考虑生产线的效率.贴片机是SMT生产线中的关键设备,因此提高贴片机的生产效率具有十分重要的意义.以环球贴片机为例,介绍了提高SMT生产线效率的方法和经验,包括PCB工艺设计、生产线平衡、优化、管理措施等,希望对相关工程人员有一定帮助.     

IMT—60贴装机工作原理及提高贴装速率的体会

本文是根据ＩＭＴ－６０外形结构，工作状态，在熟练使用的基础上，深入分析总结贴装机各部分，如贴装机气路系统，贴装头系统，贴状机传输系统，Ｘ－Ｙ定位机构系统，喂料系统，换嘴系统等部分的工作原理，同时给出贴装机精度计算法，进而摸索归纳出提高贴装速率的一套经验技巧。     

基于mean-variance的服务集群负载均衡方法

大量并发请求任务进行分配时,负载调度机制是通过最小化响应时间及最大化节点利用率实现网络中节点的负载均衡,在基于遗传算法的负载均衡算法中,适应度函数设计对服务集群负载均衡效率产生重要的影响.对此提出了一种基于mean-variance的服务集群负载均衡方法对适应度函数进行优化,采用投资组合选择模型mean-variance进行最小化响应时间,以得到每个服务器资源利用率的权重,从而获得最优的分配组合,进而提高适应度函数的准确性和有效性.在不同服务环境下与其他模型进行比较,仿真结果表明,本文的负载均衡算法在节点利用率和响应时间方面使服务集群得到了更好的均衡.     

基于模拟退火算法的风电场消纳线路负载拓扑结构研究

基于当前线路负载率具有较高的突发性、较高的实时性等特点,将对线路资源利用率和电流控制问题所采用的模拟退火算法进行风电场拓扑结构模型优化。利用模拟退火算法对线路负载均衡问题进行搜索,随后在全局最优区域附近进行局部拓扑结构优化,就可以找到线路负载均衡问题最优解。仿真研究表明,此方法不但完善了局部搜索速度,还提高了线路消纳的利用率,明显改善了线路拓扑负载不均衡的情形,进而可以为大型风电场建设中的功率设备线路拓扑优化提供有效的参考。     

Balancing energy efficiency and spectrum efficiency for lower error rate in bidirectional relay networks

A scheme for combining data rate, energy efficiency and relay location in bidirectional amplify-and-forward relay networks is proposed in this paper. The proposed scheme allows the energy consumption to be evaluated for all positions of a chosen relay along a line between the transmitter and the destination. Furthermore, the evaluated energy reduction is used to obtain the optimal balance between the energy efficiency (EE) and spectrum efficiency (SE). This balance enables the EE to increase significantly with the least loss of SE. Such a balance is then expressed with respect to the bit error rate. Numerical examples are provided to validate the analysis.

     

Distributed dynamic load balancing with applications in radio access networks

Managing and balancing load in distributed systems remains a challenging problem in resource management, especially in networked systems where scalability concerns favour distributed and dynamic approaches. Distributed methods can also integrate well with centralised control paradigms if they provide high‐level usage statistics and control interfaces for supporting and deploying centralised policy decisions. We present a general method to compute target values for an arbitrary metric on the local system state and show that autonomous rebalancing actions based on the target values can be used to reliably and robustly improve the balance for metrics based on probabilistic risk estimates. To balance the trade‐off between balancing efficiency and cost, we introduce 2 methods of deriving rebalancing actuations from the computed targets that depend on parameters that directly affects the trade‐off. This enables policy level control of the distributed mechanism based on collected metric statistics from network elements. Evaluation results based on cellular radio access network simulations indicate that load balancing based on probabilistic overload risk metrics provides more robust balancing solutions with fewer handovers compared to a baseline setting based on average load.     

容量偏差对超级电容储能的影响及解决方案

分析了容量偏差率对串联超级电容模块储能的影响,比较了采取均压措施前后超级电容模块的储能,鉴于现有均压方法存在的问题,设计了一套简单实用的超级电容电压均衡电路,并进行了仿真分析。结果显示:采用电压均衡措施后使储能提高了37%。所设计电路能够在2s内实现对电压的均衡,均衡精度约为4%,能有效解决超级电容充电时的均压问题。     

Domain load balancing routing for multi-gateway wireless mesh networks

As Wireless Mesh Networks (WMNs) are typically used for Internet access, most traffic is routed through the gateways which connect WMN to the wired network. As a result, the gateways tend to get congested and balancing of the traffic load of gateways is critical. In this paper, we consider applications that require continuous provision of a certain bandwidth to a server located at the wired network. If a path that satisfies the bandwidth request cannot be found, the request will be rejected, so that load imbalance will result underutilization of the network capacity. We present a novel load balancing routing algorithm for maximizing the network utilization (i.e., accommodating service requests as many as possible) for multi-gateway WMNs. In the proposed scheme, a WMN is divided into domains. Each domain is served by one gateway, so that all traffic of a domain is served by the corresponding gateway. Our scheme determines routing to balance the traffic load among domains, and then performs load balancing routing within each domain. Simulation results show that in square grid topologies, our intra-domain routing achieves near optimal performance with about 70% less overhead than the existing schemes. Our inter-domain load balancing scheme outperforms the existing heuristics by up to 25% while achieving about 80% performance of the optimal solution.     

基于跟随滤波和相敏检波的转轴动平衡检测系统

针对传统平衡装置需要将回转体拆出检测的不便性,尝试根据跟踪滤波和相敏检测技术研究出可用于典型旋转体设备的现场动平衡测试装置,此装置主要包括信号处理模块、下位机、上位机模块。通过现场模拟实验,证明该装置在600～1 800 r·min-1范围内,能直接对整机和机组进行动平衡检测,数据的误差均在允许的范围内,其不平衡量最大误差为0.347 g,相位最大误差不超过5°,并具有良好的测量精度和重复性。     

BALLS: A structured peer-to-peer system with integrated load balancing

Load balancing is an important problem for structured peer-to-peer systems. We are particularly interested in the consumption of network bandwidth for routing traffic and in the usage of computer resources for object storage. In this paper, we investigate the possibility to simultaneously balance these two types of load. We present a structured peer-to-peer overlay that efficiently performs such simultaneous load balancing. The overlay is constructed by partitioning the nodes of a de Bruijn graph and by allocating the partitions to the peers. Peers balance network bandwidth consumption by repartitioning the nodes. Balancing of computer resources for storage is enabled by dissociating the actual storage location of an object from the location of its search key. The paper presents and analyzes the protocols required to maintain the overlay structure and perform load balancing. We demonstrate their efficiency by simulation. We also compare our proposed overlay network with other approaches.     

Current balancing control for an interleaved boost power converter

The interleaved boost power converter has the advantages of ripple cancellation and better efficiency. The major problem of the interleaved boost power converter is the current balancing among different phases of the boost power converters. In this paper, a current balancing control method for equalizing the currents of two-phase interleaved boost power converter is proposed. The output current can effectively detect the mismatch between the boost power converters for the interleaved boost power converter. The output current is used to perform both the current balance and the current-mode control. The salient feature is that only one current sensor is used in the proposed current balancing control method. A hardware prototype is developed, and the experimental results verify the performance of the proposed current balancing control method is as expected.