共查询到20条相似文献,搜索用时 31 毫秒
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通过对矿井通风机扩散器弯头结构处常见的导流板布置方式进行对比分析,采用有限元流体计算方法,对常见导流板布置方式的优缺点进行了说明,并且加入了长圆弧导流板的数值模拟分析,为矿井技术人员在通风系统实际应用方面提供了依据. 相似文献
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以HW15710/19710双中间轴变速箱为研究对象,根据售后故障图片分析进行故障再现试验进行验证,得出导致变速箱齿轮烧蚀的很重要一个原因是变速箱缺油。 相似文献
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针对电站汽轮机实际装配过程中,上半汽缸重量产生的挠度对汽轮机装配后产生偏差进行测量和分析,并结合装配过程提出如何进行修正。 相似文献
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柴油机三大偶件是整个系统的关键部件,磨损之后严重影响柴油机的工作性能。通过实验,分别测量三大偶件磨损后柴油机的供油量和供油压力波形,并对三大偶件对柴油机的供油量和供油压力的影响作了定性分析,为柴油机燃油系统的故障诊断提供了一个可靠的方法和依据。 相似文献
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花键轴齿形成形中齿根开裂的研究 总被引:1,自引:0,他引:1
应用有限元分析软件,对花键轴的齿形成形过程进行模拟.通过研究应力分布,证实齿根开裂现象的发生,找到齿根开裂的原因.通过分析断裂因子的分布和变化,预测可能发生开裂的位置.结合六齿矩形花键轴实际成形情况进行模拟计算,获得了入模半锥角的较佳取值范围. 相似文献
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JT-6-19推焦车在推焦杆推焦进退过程中,出现不同程度的震动.分析推焦杆推焦中的各种因素及受力情况,找出主要因素,减小水平度公差,减小震动. 相似文献
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轴承产品的包装是指对轴承进行清洗、防锈处理后,为达到防水、防潮、防尘和防冲击,维护轴承的质量和精度,方便使用所采用的内、外包装。轴承外包装标准有两项:JB/T3016-2004《滚动轴承包装箱技术条件》和JB/T4036-2004《滚动轴承运输用托盘和大木箱》。近年来,包装材料、包装容器、包装方法、包装印刷和包装机械方面的迅速发展,有效地推动了轴承产品的包装技术改造。 相似文献
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《现代制造技术与装备》2016,(2)
随着工业的发展,我国钢结构技术迅猛发展,大量的工业厂房由原来的钢筋混凝土结构逐步被钢结构替代。由于某些工艺的要求,一些钢结构厂房的规模不断扩大。对大跨度的钢结构厂房来说,厂房内管道支架安装是其难点。本文对大型天基板屋面厂房内管道支架的施工进行简要分析。 相似文献
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滚筒式打麻辊是简易苎麻剥麻机的核心部件,由柴油机驱动,主要作用是将喂入的苎麻条麻骨打碎。柴油机工作时产生的机械振动造成打麻辊的疲劳寿命和工作性能大幅降低。在这个过程中,打麻辊中紧固L型刀片的螺栓受影响最大。螺栓松动会造成L型刀片松动甚至脱落导致机器严重受损。为解决上述问题,本文研究柴油发动机的振动机理,建立合适的振动模型,运用MATLAB分析振型提出改进方案,最后通过样机试验来验证方案的可行性。 相似文献
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In this paper, the results of studying the efficiency of an SP-6 M switch motor have been presented. The friction clutch plays an important role during the transmission of torque from a motor to an actuator. To study a motor switch, a test rig was developed in order to determine the necessary force to move switchblades depending on the pressing force of the friction clutch. The tribological properties of the friction disk materials have been investigated using a specially designed test machine. 相似文献
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本文结合目前国内常用的三菱、FANUC、哈斯数控系统简明扼要地阐述了数控编程中使用宏程序的的优越性.用户宏功能是用户提高数控机床性能的一种特珠功能,在相类似工件的加工中巧用宏程序将起到事半功倍的效果. 相似文献
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F. Čuš 《The International Journal of Advanced Manufacturing Technology》2000,16(6):392-403
The paper deals with the optimisation model of cutting variables by which the manufacturing costs should be reduced to the
lowest possible value. The optimisation strategy takes place in two steps by taking into account all input variables (technological
limitations). First, the tool geometric variables are changed using selected cutting variables; in this way, the smallest
cutting force variables are determined. Geometric variables for the case of the smallest cutting force are used for the second
optimisation step in which the cutting variables are changed. Optimisation of the cutting variables is tested practically
under workshop conditions. In this way, important information about the validity of the optimised values is obtained. If there
are significant differences between the theoretical and practical values, then the theoretical values must be corrected (correction
of cutting variables). As the study of the cutting processes requires much experimental and theoretical work and applies to
a very large body of data, we have organised an information centre for cutting conditions. When forming the information centre
for cutting conditions, it was impossible to avoid the requirement that the technological database must be actively included
in the computer-supported integrated manufacture. 相似文献
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The existence of thermocline changes the acoustic structure and effects the direction of the sound rays.This paper analyzes the working process of the active sonar,and the mathematical models.The detection probability of the active sonar under thermocline is studied.First,the detection distance without thermocline is estimat-ed,then the effect of thermocline's depth and sound velocity changes on detecting submarine probability are discussed,and based an this,the effects of the sea condition on searching submarine probability is discussed,lastly the distance of active sonar is calculated under ther-mocline. The results indicate that under thermocline,the distance of the active sonar becomes obvious short,and with the sea condition becoming rough,the effect is more clear. 相似文献
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A method for the recognition of dispersion curves on the spectrogram of acoustic-emission signals has been developed based on the Hough transform. The method was successfully tested in an experiment using a Hsu-Nielsen source. It has been determined that the suggested method can determine the distance from the source of a signal, even when the signal arrives only at one acoustic emission transducer. This enables one to perform AE testing only with one-sided access to any dimensional object or when there is a sufficiently large distance between transducers, when an AE signal reaches only one of them. 相似文献
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为进一步提升锚杆对井巷围岩变形的控制效果,应根据井巷实际地质、煤层等条件综合确定锚杆支护参数.以3号煤层所属工作面为例,在分析其地质、煤层等条件以及支护现状的基础上,建立数值模拟模型,着重对不同锚杆长度、锚杆直径以及锚杆间距对井巷围岩变形的控制效果进行对比分析,最终得出最佳锚杆支护参数. 相似文献