稻草水洗撕裂机的研制

目前，国内已有专家研究出利用稻草作为原料生产食用菌的方法，其工艺是成熟的，并且经济效益相当可观但由于缺少栩应设备将稻草原料进行初加工，故未得到广泛推广。为此，笔者没计了一种机械——稻草撕裂机，将稻草进行撕裂、切断初加工，以满足生产食用菌的要求。     

秸秆撕裂机的设计与研究

对秸秆撕裂机的结构、工作原理作介绍,对主要零部件的结构进行说明,使利用稻草作为原料生产食用菌成为可能。     

新型秸秆撕裂粉碎机的设计

目前食用菌生产的原材料资源不断开发,为了充分利用农业废料,设计了一种利用动定锯齿结构对稻草等秸秆进行较细撕切粉碎的加工机械,能够用作食用菌的原料,大大提高了稻草的利用率.     

济钢1750m^3高炉供料皮带防撕裂改造

济钢第二炼铁厂1750m3高炉供料区域皮带多,不能互相备用,受设备、作业环境、供料方式的影响,原料中经常附带许多铁件,这些不规则的铁件在原料的运输过程中插入运行的皮带,导致皮带撕裂。同时,部分皮带机料筒结构设计不合理,经常溢料挤裂皮带,影响正常生产并造成较大经济损失。为解决皮带被铁件划伤、撕裂事故,需对供料皮带进行防撕裂改造。     

基于机器视觉的矿用输送带纵向撕裂检测系统设计

针对矿井生产中输送带纵向撕裂事故的易发性,使用机器视觉方式设计一套自动的事故检测系统。利用工业CCD相机对输送带的实时情况进行采集,下位机PC处理平台对输送带图像进行撕裂识别和检测,下位机与报警及输送机控制装置相连,可实现事故时对输送机工况的及时控制。     

某型柴油机机身螺栓孔撕裂修复研究

大型中速柴油机机身作为船用动力装备不可更换的零部件,其主要连接螺栓的断裂以及螺栓孔的撕裂给柴油机的使用造成极大影响,同时螺栓孔的撕裂修复也一直是相关领域研究的重点。本文通过对某大型柴油机机脚螺栓孔撕裂情况进行分析研究,根据现场实际结构布局提出修复方案,并对修复方案进行三维运动仿真及强度计算,最后通过实际装机验证,确认了修复方案的可行性。     

离心泵叶轮口环撕裂原因分析

某大型工业离心泵在生产运行中转子叶轮口环发生撕裂。通过外观检查、成分分析、断口分析、金相组织分析和硬度测试等手段对断裂性质进行诊断,分析口环撕裂原因。结果表明:材质确为ZG06Cr13Ni4Mo,基体组织均为回火索氏体加逆转变奥氏体。可以诊断断裂性质为脆性断裂,口环撕裂的主要原因是由于基体材质中存在大量的非金属夹杂物并存在链状分布的情况,严重破坏了基体的连续性,导致叶轮口环的力学性能下降。在运行过程中的工作载荷作用下,裂纹首先在叶轮口环材质基体中的链状非金属夹杂物处萌生,并沿着非金属夹杂物扩展直至口环发生撕裂,从而引发叶轮失效。     

新型食用菌菌棒自动套袋装袋机的设计与应用

本文通过一大型食用菌节能机械企业对菌棒自动化生产设计和研究,根据人工对食用菌菌棒的菌袋固定、装袋、扎口、打孔和接种多道工序分析,设计相对应的设备,成功设计由套袋机、装袋机、扎口机和接种机配合而成的加工流水线,在无人工无菌环境中,全自动化完成对食用菌菌棒的加工。本新型套袋装袋机减少人工成本,提高生产效率,可达到100%无菌感染的标准。     

SFDG-60型自走式粪草类食用菌培养料翻堆机研发

分析我国粪草类食用菌栽培过程中培养料的人工堆制工艺,简要介绍国内翻堆机的应用和开发现状,由此提出新型了翻堆机关键工作部件采用旋转运动机构的设计思路。介绍SFDG-60型自走式粪草类食用菌培养料翻堆机的结构组成、工作原理等。重点介绍其翻料滚筒的结构,并分析设计该滚筒的钉齿排列及转速。经过创新设计的翻堆机满足粪草类食用菌培养料堆制农艺要求,适应多种场地作业。检测测定,机器作业性能达到预期设计指标。     

胶带撕裂的形成与预防措施

带式输送机由于具有连续、高效、循环运行的特性,是散货自动化作业线的关键设备。但在运转过程中胶带撕裂的事故时有发生,尤其以纵向撕裂对企业造成的影响最大,一旦发生轻则给企业带来严重的经济负担和大量的维修工作,重则造成停产并影响设备管理技术人员的工作信心。所以分析和预防胶带撕裂在煤码头尤为重要。我们以汕头港务集团第四分公司专业煤炭装卸码头历年所发生的胶带撕裂事故为基础,分析形成原因,探索降低损失     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.