共查询到20条相似文献,搜索用时 140 毫秒
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针对热封辊轴在工作过程中空气与辊轴和加热管间的流固耦合问题,在Star CCM+中建立三维参数化仿真模型。根据试验数据设置运行速度、材料、导热系数、进出口界面等边界条件,采用k-ε湍流模型进行稳态传热数值计算,得到耦合系统的温度场。在此基础上,结合加热管分段数和螺距等因素设计了4组改型方案,并进行温度场仿真分析。结果显示:第二组方案的热封辊轴温度两端高中间低,可以部分抵消辊轴整体热胀;实物综合循环试验跟踪记录结果表明该方案满足新机器在实际使用中的要求。 相似文献
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首先通过理论计算确定了辊轴和辊套过盈配合过盈量的上、下限,然后对不同过盈量下的过盈联接进行有限元分析,得到了辊轴与辊套在过盈配合状态下的接触面压强及辊套整体的应力分布情况,结果表明选定的配合尺寸符合设计要求。 相似文献
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磨辊轴过盈联接系统可靠性设计 总被引:1,自引:0,他引:1
考虑磨辊轴过盈联接设计参数的随机性,将磨辊轴过盈联接强度、辊轴强度、辊体强度三种强度的可靠度视为一个串联系统,提出了基于系统可靠度的磨辊轴过盈联接可靠性设计模型。计算结果表明,就系统可靠度和重量而言,这里给出的六种设计方案均优于二种目前广为采用的设计方案。 相似文献
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针对传统的机械机构应力分析方法,本文以工作装置在静力条件下的正载工况和偏载工况为例.应用ANSYS软件建立装载机工作装置的有限元模型,并对模型在这两种工况下进行应力状态分析,找出机构的危险点和应力集中区,对工作装置设计有一定的指导意义。 相似文献
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我公司一分厂在改造煤加工系统时,增设了一台辊轴筛,用于混合块煤的预筛分。当不同块径的混合煤通过辊轴筛时,块径合格的煤落下,进行二次筛分,其余块煤被输送到双齿辊破碎机进行破碎加工。一、故障分析经过几年运行,出现了辊轴虽正常运转但块煤却停在原处不向前移动的情况,使后道工序不能工作,直接影响生产。辊轴为空心铸钢件,按合格煤块径的要求设计,结构如图1。经观察分析,因煤长期与辊轴接触,擦系数减小;而担负输送工作的齿顶也被磨尖,且因煤的比重小,故造成辊轴筛不能正常工作。二、修理方法在同一根轴上,每隔一齿按120度等分,加工深10m… 相似文献
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滚子修形对轴承性能影响的研究 总被引:3,自引:2,他引:3
为了提高滚子轴承的工作寿命和承载能力,普遍采用滚子修形。本文研究了直线滚子、全凸滚子、凸弧-直线滚子和对数滚子的母线方程及修形参数,在相同的工况条件下,分析计算了这四种滚子的接触应力沿接触线的变化情况,得出了对数滚子具有最佳受载状态的结论。并以提高轴承工作寿命为目标,建立了确定最佳修形量的数学模型,分析了修形量对轴承受载特性的影响,得出了滚子合理修形可以显著改善高速滚子轴承受载状态的结论 相似文献
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以某隧道工程实际工况条件为例,建立盾构机主驱动轴承载荷分布计算模型和等温线接触弹流润滑模型,通过数值分析得到极限工况和占比99.9%的工况条件下盾构机主驱动轴承的油膜厚度及油膜压力分布;依据实际工况条件分析不同工况对轴承油膜厚度、油膜压力的影响规律,以及滚子所处位置不同时滚子负载与油膜压力和膜厚之间的变化关系。结果表明:不同工况下主轴承油膜厚度、油膜压力分布规律相似,均出现二次峰值;同一工况下,随着滚子于主轴承所处位置不同,油膜压力及膜厚最值随滚子负载的增大而减小;同一位置处二者最值随主轴承受力的增大而减小。 相似文献
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Essentially the fault diagnosis of roller bearing is a process of pattern recognition. However, existing pattern recognition method failed to capitalize on the nature of multivariate associations between the extracted fault features. Targeting such limitation, a new pattern recognition method – variable predictive model based class discriminate (VPMCD) is introduced into roller bearing fault identification. The VPMCD consider that all or part of the feature values will exhibit interactions in nature and these associations will have different performances between different classes, which is always true in practice when faults occur in roller bearings. Target to the characteristics of non-stationary and amplitude-modulated and frequency-modulated (AM–FM) of vibration signal picked up under variable speed condition, a fault diagnosis method based upon the VPMCD, order tracking technique and local mean decomposition (LMD) is put forward and applied to the roller bearing fault identification. Firstly, LMD and order tracking analysis method are combined to extract the fault features of roller bearing vibration signals under variable speed condition; Secondly, the feature values are regard as the input of VPMCD classifier; finally, the working condition and fault patterns of the roller bearings are identified automatically by the output of VPMCD classifier. The analysis results from experimental signals with normal and defective roller bearings indicate that the proposed fault diagnosis approach can distinguish the roller bearing status-with or without fault and fault patterns under variable speed condition accurately and effectively. 相似文献
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基于ADAMS的冲击压路机动力学仿真研究 总被引:1,自引:0,他引:1
利用虚拟样机技术,建立了冲击压路机的动力学模型;主要对牵引主机在作业中所受水平冲击载荷进行了仿真研究.首先在pro/E环境下建立了冲击压路机的装配模型;然后将该模型导入独立的ADAMS环境中,并建立整机的动力学仿真模型.在压实工况下,对该系统进行了动态特性仿真研究,并获得了地面和工作装置传递给牵引主机的水平冲击截荷及其变化规律.通过仿真结果与试验结果的对比,验证了模型的正确性,研究结果可为设计该类机械结构提供参考. 相似文献
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After a heat preservation cover is installed on the main rolling line, the heat dissipation environment of the transfer roller working on the heat preservation cover is changed. To ensure the normal production, a reasonable working jet capacity of the roller neck is derived. First, a globe model of the transfer roller is built for finite element analysis. Second, the sub-model of the fixed end bearing is built and the boundary condition of the sub-model is supplied by the results of the globe model. The analysis result of the sub-model shows that the temperature of the transfer roller bearing exceeds 85°C a rolling periodicity later. With finite element analysis, the heat flux is obtained and the minimum working jet capacity is derived. 相似文献
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After a heat preservation cover is installed on the main rolling line, the heat dissipation environment of the transfer roller
working on the heat preservation cover is changed. To ensure the normal production, a reasonable working jet capacity of the
roller neck is derived. First, a globe model of the transfer roller is built for finite element analysis. Second, the sub-model
of the fixed end bearing is built and the boundary condition of the sub-model is supplied by the results of the globe model.
The analysis result of the sub-model shows that the temperature of the transfer roller bearing exceeds 85°C a rolling periodicity
later. With finite element analysis, the heat flux is obtained and the minimum working jet capacity is derived. 相似文献