连续回转式甘蔗收割机集堆机构设计与试验

集堆是整秆式甘蔗收割机的重要作业工序之一,集堆性能影响到收割机作业质量。本文在分析现有的几种甘蔗收割机集堆机构的基础上,设计了一种连续回转式集堆机构,并试制了样机。田间试验结果表明,该机构能够有效实现甘蔗集堆功能,达到了设计要求。

4GL—1型割晒机集堆器的设计研究

本文从理论分析和设计实践两个方面综合探讨了农作物收获过程中放铺集堆装置的工作过程和特点,分析了集堆器弹齿机构集拢作物时的运动规律。在此基础上设计出了新型的搂齿机构。并通过田间试验取得了满意的结果。该装置的使用对于农业生产的丰产增收,降低人力劳动强度,对中小型农作物收割机械的作业功能增加将有明显的社会效益和经济效益,具有较好的推广使用价值。

间歇回转式甘蔗收割机集堆机构设计与试验

集堆是整秆式甘蔗收割机的重要作业工序之一,集堆性能影响到收割机作业质量。本文在分析现有的几种甘蔗收割机集堆机构的基础上,设计了一种间歇回转式集堆机构,并试制了样机。田间试验结果表明,该机构能够有效实现甘蔗集堆功能,达到了设计要求。

整秆式甘蔗收割机集堆装置重力自卸机构设计与仿真

甘蔗集堆是整秆式甘蔗收割的重要环节,其集堆的效率及集堆效果影响整秆式甘蔗收割机的工作速度。为此,提出一种基于重力自卸的甘蔗集堆机构,运用三维软件Creo对集蔗装置重力自卸机构进行三维建模,并运用Adams对自卸机构进行运动学仿真分析,验证机构设计的正确性与可行性。

4U-1600型集堆式马铃薯挖掘机设计与试验

针对传统一级升运链马铃薯挖掘机土薯分离效果差、人工捡拾铺条劳动强度大的作业难题,设计了4U-1600型集堆式马铃薯挖掘机。对挖掘机阶梯挖掘铲、两级升运链式土薯分离输送装置及液压开启式集薯箱等关键部件进行设计与选型,并完成其关键参数的计算确定。以样机前进速度、一级土薯分离装置线速度和二级土薯分离升运装置线速度为自变量,以明薯率和伤薯率为响应值,依照BoxBehnken试验设计原理,采用三因素三水平响应面分析方法,分别建立了各因素与明薯率、伤薯率之间的数学模型,并对各因素及其交互作用进行分析。试验结果表明,对明薯率影响的主次顺序依次为二级土薯分离升运装置线速度、样机前进速度和一级土薯分离装置线速度,对伤薯率影响的主次顺序依次为一级土薯分离装置线速度、二级土薯分离升运装置线速度和样机前进速度;马铃薯挖掘机最佳工作参数为:样机前进速度1.50 m/s、一级土薯分离装置线速度1.37 m/s、二级土薯分离升运装置线速度0.89 m/s。验证试验表明,4U-1600型集堆式马铃薯挖掘机作业后,明薯率为95.11%、伤薯率为3.36%,性能试验指标均达到国家行业标准要求,表明在优化工作参数条件下该作业机能够提升马铃薯机械化收获质量。

压水堆高温陶瓷型堆内捕集器设计与初步分析

为防止压力容器内壁发生熔化,作为压力容器外部冷却技术的补充,本文设计了一种由耐高温陶瓷材料制成的堆内捕集器,利用陶瓷材料耐高温、高热阻的特性来优化热流分配。通过建模和计算,结果表明:熔融物氧化物层向下的平均热流密度明显降低,压力容器内壁不会出现熔化现象,保证了其完整性;向上的热流增加使上腔室温度升高,但未超过其结构材料熔点,不会造成上腔室熔化。研究结果显示了采用耐高温陶瓷堆内捕集器设计的潜在可行性。

直线度误差测量数据处理的堆凸集法

本文针对直线度误差在线自动测量中提出的数据处理问题，提出了一种新的解法——堆凸集法。把进行中的测量数据定义为整个测量数据集的一个子集，当测量数据依序获得时，相当于对这个子集求其与另一个子集的和。一般情况下，两个子集的和并不一定是一个子集，因此本文给了一个关于两子集之和的定义，在此定义之下可以使用堆集方法解决渐增凸集的问题。

堆内捕集器对压力容器中子辐照影响分析

严重事故下为实现堆内熔融物滞留,可采用堆内捕集器(IVCC)的策略。捕集器属压力容器的一部分,属不可更换设备,需长期在堆内受中子辐照。本文通过对典型压水堆压力容器模型和带IVCC的压力容器模型的比较,发现IVCC不会改变压力容器内快中子通量,不会对压力容器的辐照造成影响。且IVCC使得压力容器的热中子通量明显减小,降低了压力容器的整体辐照水平。这说明IVCC对压力容器的辐照性能不会产生不利影响,反而有助于防止压力容器的老化。

一种小型螺旋集摊机

为在自然晾晒收获粮食时,减轻劳动强度、节省劳力、提高生产效率,并能应付突变的天气,我们研制了一种小型螺旋集摊机,并对样机在粮库晒场进行了生产实验,对小麦、玉米、大豆进行摊晒和集堆,效果很好。

某铝土矿采剥工艺设计及设备选型特点

缓倾斜、薄至中厚矿体露天采剥方法及设备配置相关研究不多,针对国外某铝土矿矿体为缓倾斜、薄至中厚矿体的赋存特点,设计推荐采剥工作面布置沿地形水平布置,由下往上开采,推土机剥离或集堆,挖掘机铲挖,采矿、复垦同时进行,该方法能提高矿山设备效率,降低能耗及贫化率,最终达到高效、节能、效益最大化的目的。

提高桂西铝土矿难洗矿胶泥矿回收率的研究

文章分析了堆积型铝土矿胶泥难洗的原因,阐述加快难洗胶泥矿物理改性的回采新工艺以及后续出矿阶段的配矿方法,通过采用组合的方式,能提高难洗胶泥矿的回收率。

信函自动分拣机应用中的几点体会

信函自动分拣机应用中的几点体会广州市邮政局何锡平，曾俊强我局继深圳、北京之后引进了日本和德国的信函处理设备，自１９９４年１月验收后正式投产使用已一年有余，经过对人、机结合生产作业形式的不断探索和改进，引进设备所发挥的作用越来越显著。可以说，广州局目前...

Model and algorithm for container ship stowage planning based on bin-packing problem

In a general case, container ship serves many different ports on each voyage. A stowage planning for container ship made at one port must take account of the influence on subsequent ports. So the complexity of stowage planning problem increases due to its multi-ports nature. This problem is NP-hard problem. In order to reduce the computational complexity, the problem is decomposed into two sub-problems in this paper. First, container ship stowage problem (CSSP) is regarded as 'packing problem', ship-bays on the board of vessel are regarded as bins, the number of slots at each bay are taken as capacities of bins, and containers with different characteristics (homogeneous containers group) are treated as items packed. At this stage, there are two objective functions, one is to minimize the number of bays packed by containers and the other is to minimize the number of overstows. Secondly, containers assigned to each bays at first stage are allocate to special slot, the objective functions are to minimize the metacentric height, heel and overstows.The taboo search heuristics algorithm are used to solve the subproblem. The main focus of this paper is on the first subproblem. A case certifies the feasibility of the model and algorithm.

HPR1000： Advanced Pressurized Water Reactor with Active and Passive Safety

HPR1000 is an advanced nuclear power plant(NPP)with the significant feature of an active and passive safety design philosophy,developed by the China National Nuclear Corporation.On one hand,it is an evolutionary design based on proven technology of the existing pressurized water reactor NPP;on the other hand,it incorporates advanced design features including a 177-fuel-assembly core loaded with CF3 fuel assemblies,active and passive safety systems,comprehensive severe accident prevention and mitigation measures,enhanced protection against external events,and improved emergency response capability.Extensive verification experiments and tests have been performed for critical innovative improvements on passive systems,the reactor core,and the main equipment.The design of HPR1000fulfills the international utility requirements for advanced light water reactors and the latest nuclear safety requirements,and addresses the safety issues relevant to the Fukushima accident.Along with its outstanding safety and economy,HPR1000 provides an excellent and practicable solution for both domestic and international nuclear power markets.

Review of containership stowage plans for full routes

Containership stowage plans are a pivotal teaches in the system of container transportation.With the increasing containers shipping,planning containership stowage has become more and more complicated.So intelligent stowage planning for containerships is of great significance.An effective stowage plan may improve efficiency of transportation system.First,the progress of containership stowage plan at home and abroad is reviewed,including the latest developments,such as the application of various optimization methods and computer techniques to the problem.Then,the complexities of the problem are discussed and areas where investigations are still needed are pointed out.This will provide a reference for further research on the subject.

Research on logistics domain-oriented cloud resource management model and architecture

To address the challenges posed by resource shortage or surplus to enterprises productivity,Internet platforms have been widely used,which can balance shortage and surplus in broader environments. However,the existing resource management models lack openness,sharing ability and scalability,which make it difficult for many heterogeneous resources to co-exist in the same system. It is also difficult to resolve the conflicts between distributed self-management and centralized scheduling in the system. This paper analyzes the characteristics of resources in the distributed environment and proposes a new resource management architecture by considering the resource aggregation capacity of cloud computing. The architecture includes a universal resource scheduling optimization model which has been applied successfully in double-district multi-ship-scheduling multi-container-yard empty containers transporting of international shipping logistics. Applications in all these domains prove that this new resource management architecture is feasible and can achieve the expected effect.

Mass Transfer Characteristics of H_2 and CO in Mimicked F-T Slurry Bubble Column Reactor

The equilibrium solubilities,volumetric gas-liquid mass transfer coefficients kLa of H_2 and CO were measured as functions of temperature(298―513 K),pressure(1―3 MPa),superficial gas velocity(0.5―3 cm/s) and solid volume fraction(5%―25%) in liquid paraffin/iron-based catalyst slurry bubble column reactor.The volumetric mass transfer coefficients kLa were obtained by measuring the dissolution rate of H_2 and CO.The influences of the operation conditions,such as pressure,temperature,superficial gas velocity and catalyst concentration on kLa,were investigated.Two empirical correlations were proposed to predict kLa values of H_2 and CO in liquid paraffin/solid particles slurry bubble column reactor.The results showed that the equilibrium solubilities of H-2 and CO increased with an increasing temperature and pressure,and the solubility of CO was greater than that for H_2.It was found that the equilibrium solubility can be expressed by Henry's law.The volumetric mass transfer coefficients of H_2 and CO were of the same order of magnitude,and increased with the increase of pressure,temperature and superficial gas velocity.The presence of solid particles decreased kLa values of both H_2 and CO.

An optimal stacking order for mid-bond testing cost reduction of 3D IC

In order to solve the problem that the testing cost of the three-dimensional integrated circuit(3D IC)is too high,an optimal stacking order scheme is proposed to reduce the mid-bond test cost.A new testing model is built with the general consideration of both the test time for automatic test equipment(ATE)and manufacturing failure factors.An algorithm for testing cost and testing order optimization is proposed,and the minimum testing cost and optimized stacking order can be carried out by taking testing bandwidth and testing power as constraints.To prove the influence of the optimal stacking order on testing costs,two baselines stacked in sequential either in pyramid type or in inverted pyramid type are compared.Based on the benchmarks from ITC 02,experimental results show that for a 5-layer 3D IC,under different constraints,the optimal stacking order can reduce the test costs on average by 13%and 62%,respectively,compared to the pyramid type and inverted pyramid type.Furthermore,with the increase of the stack size,the test costs of the optimized stack order can be decreased.