高剪切均质机转子齿变形的可靠性研究

目前高剪切均质机转子系统转速有不断提高的趋势,这对均质设备工作的可靠性提出了新的挑战。课题组以转子系统为研究对象,提出了高速转子齿径向位移的数学力学模型,在此基础上结合机械结构可靠性设计理论,以均质机转子的工作转速、齿全高、底厚和齿厚为变量,导出了转子最外层齿顶径向位移变形的可靠度计算函数。实例分析结合有限元计算结果表明该位移可靠度公式是正确的,实践也验证了该型号的高剪切均质机具有良好的工作可靠性。所得结论同时也为新型高剪切均质设备转子的设计与优化提供一定的参考依据。     

高剪切均质机转子的力学性能分析

对于普通实体底盘式转子得到了应力和应变的解析解；对于筋板式底盘的超高速转子，应用有限元法计算了变形和应力的分布及转子的固有频率和振型的数值解，所得的结果为此类转子的结构参数优化设计提供了依据。     

高速超剪切均质机结构设计有限元分析

运用有限元理论，抽象出高速超剪切均质机的关键元件（转子），建立了有限元模型，分析了转子在高速转动下（5000r/min)的有限元静态应力与振动模态，并用图形形式输出；讨论了ANSYS输出文件的特性，为进一步对高速超剪切均质机关键结构的研究和设计提出可靠的理论依据。     

高速定转子均质机均质过程能量特性的研究

对高速定转子均质机均质过程中能量特性的理论进行了研究，分析了能量分散率的确定方法，并进行了相关的实验分析，从不同类定转子组合得到相应的能量特性，为进一步对定转子均质机的研究和设计提供理论与实验依据。     

超高速剪切式均质机转子系统非线性动力学数值的仿真分析

针对剪切式均质机转子系统建立其动力学模型,并对模型加以无量纲化和必要的简化,用于数值仿真。对建立的动力学模型,编写相应的庞卡莱图,轴心轨迹图,相位图,波形图,频谱图的作图分析程序。通过该程序分析其运算所得数据和图形,得出影响转子系统稳定性的因素和在超高转速下提高均质机转子的稳定性方法。     

无摩擦气缸活塞的结构变形分析

针对超低频悬挂装置刚体往复运动的无摩擦要求,设计了一套新颖的无摩擦气缸-活塞结构。建立了无摩擦气缸-活塞应力计算模型,得到气缸和活塞结构应力计算公式。利用ANSYS Workbench建立无摩擦气缸-活塞的气膜仿真计算模型,计算得到气膜沿活塞轴向的压力分布情况,利用单向流固耦合模块将气膜压力加载到无摩擦气缸-活塞上,基于线性静力结构分析模块Static Structural计算无摩擦气缸-活塞应力和应变分布,对结果做出分析,对无摩擦气缸-活塞结构不合理之处提出了解决方案。     

基于ANSYS的脱溶机转子结构有限元分析及优化

大豆粕低温脱溶过程中,传统脱溶机转子的辐条式端板结构易出现疲劳断裂。通过对脱溶机转子辐条式端板的结构研究,建立力学模型,采用ANSYS软件对转子辐条式端板进行有限元分析,模拟辐条各截面上应力的变化,确定端板辐条应力集中位置。为该转子端板结构的改进方案提供理论依据。     

高速齿轮箱齿轮轴转子动平衡的分析与处理

主要对高速齿轮箱齿轮轴转子按实际情况进行分类,并按类别作低速、高速动平衡,同时为了便于齿轮轴转子作动平衡,给予了相关建议。     

模切机墙板变形分析及优化

为了解决传统模切机主机墙板在工作过程中可能出现的断裂或形变过大问题,运用Solid Works对模切机主机墙板进行三维建模,采用ANSYS软件对模型进行受力分析,输出主机墙板的位移等值线图和应力等值线图,确定应力集中区域,提出了不同的结构优化方案。对比优化方案的结果,确定了最终的优化结构。通过对优化后的模型进行分析,得出结论:优化后的结构不仅满足强度和刚度的要求,还降低了应力集中区域的最大应力值。     

丙烯腈变径回收塔的可靠性分析

压力容器是常见的化工设备,其常规设计早已非常成熟。而常规的安全系数法却不能反映应力和材料强度变化。针对此不足采用ANSYS概率设计方法,不仅考虑了应力和强度的变化,又考虑了失效的不同后果。文章以丙烯腈回收塔为例,对其进行了可靠性分析。从计算结果可以看出,用ANSYS概率分析方法对压力容器进行设计即安全又经济。     

微机喷窑报警系统的抗干扰设计与可靠性分析

微机喷窑报警系统能有效防止水泥机械化立窑生产过程中的喷窑事故发生．通过对供电、屏蔽与接地及信息通道等硬件抗干扰设计和系统控制软件中采用数字滤波及容错算法，从而使该系统具有很强的抗干扰能力．同时，选用经过功能检验的集成电路和１００ｈ的成机拷机，大大增强了系统的可靠性．     

工业水洗机转笼结构设计的有限元分析

根据一般的转笼结构形式和实际受力状况,建立有效的转笼在工作过程中的静力学模型和动力学模型,对转笼在高速脱水状况下的偏心激震力大小和分布规律进行分析,利用有限元分析工具,有效控制转笼转笼的受力变形和疲劳破坏等实际问题。针对某工业水洗机转笼建立分析模型。利用有限元软件Cosmosworks对转笼改进进行变形控制和结构优化。图13表1参10     

酶制剂和活性干酵母在大曲酱香型酒中的应用

提出将酶制剂和活性干酵母同时应用于大曲酱香型优质白酒生产。试验表明酒酷酒精含量随着酶制剂、干酵母的加入量的增多而增大,且达到最高酒精份的时间逐步缩短,出酒率最高可增产71.7％;在不影响大曲酱香型酒质量的前提下,酶制剂和活性干酵母的最佳加入排次宜从四排开始,并选取适当加入量,大曲用量减少10％～15％之间时可提高发酵活力,加速糖转化为酒的过程,缩短发酵期。实例计算证明,采用该工艺可明显提高经济效益。     

采用PLC控制的聚酯生产线热媒炉控制系统的设计

本文介绍经改进的聚酯生产线上热媒炉控制系统的设计思想、工艺过程以及采用PLC控制的硬件和软件实现等．改进后的热煤炉控制系统投入运行后，硬件设备成本降低了50％，所用燃料可由柴油改用重柴油，加热系统原料成本降低了30％。     

CT试样焊缝界面裂纹蠕变断裂参量估算的数值模拟研究

针对双材料紧凑拉伸试样,提出了加权平均C的概念,即双材料CT(Compact Tension)试样的C总是可以通过对由其母材和焊材组成的均质CT试样C的加权平均计算而得到,进而基于美国ASTM标准E1457,提出了一个双材料CT试样C的估算式,以用于简单估算特定材料CT试样的C值。采用ABAQU S软件,通过有限元法模拟分析裂纹处于焊缝界面的双材料CT试样和分别由其母材和焊材组成的均质CT试样的蠕变断裂性能,验证了加权平均C概念的正确性,同时也验证了上述估算双材料CT试样C方法的可行性。     

Finite element analyses of compressive behaviors of biaxial warp-knitted composite material under various strain rates with a simplified geometrical model

This paper reports the compressive behaviors of biaxial warp-knitted (BWK) composite material under compression with various strain rates. The compression stress–strain curves and the failure modes along three orthogonal directions were obtained from split Hopkinson pressure bar (SHPB) apparatus. A finite element analysis (FEA) model based on a simplified model of BWK composite was also carried out to verify the experimental results. In the simplified model, an equivalence resin (ER) combined tricot yarns with resin, and the stiffness matrix was derived from the mechanical parameters of the tricot yarns and the resin. A good agreement between experimental and FEA demonstrates that the simplified method is applicable of modeling the high strain-rate behaviors. By comparing the experimental damage morphologies with the damage development and morphologies observed from the model, it was found that the FEA model offers a better understanding to the compression damage mechanisms. The model can also be extended to design the impact performance of the BWK composite with high efficiency.     

Multi-scale structure finite element analyses of damage behaviors of multi-axial warp-knitted composite materials subjected to quasi-static and high strain rate compressions

This paper reports a multi-scale structure finite element modeling scheme to analyze the damage behaviors of biaxial multi-layer warp-knitted composite materials subjected to quasi-static and high strain rate compressions. The multi-scale structure model includes: (1) a micro/meso/macro structure model with periodic boundary conditions for homogenizing the heterogeneous fiber/resin system into unit cells, and (2) a macroscopic rate-dependent plasticity model for the knitting composite materials combined with critical damage area failure theory, which accounts for the stiffness degradation and failure strength of the material. The finite element results from the model provide the locations of stress propagation, the stress distribution, and the progressive failure behavior within the biaxial multi-layer warp-knitted composite materials. The effects of the knitted yarns and the element number sensitivity of the macro-scale model have also been discussed.     

Large-scale finite element analysis of a 3D angle-interlock woven composite undergoing low-cyclic three-point bending fatigue

This paper reports the large-scale finite element analysis (FEA) of a 3D angle-interlock layer-to-layer woven composite material undergoing low-cyclic three-point bending fatigue at microstructure level. A microstructure geometrical model of the 3D woven composite material was established to model the real structure of the woven composite. The fatigue behaviors of the 3D woven composite undergoing three-point bending with sinusoidal wave-form were investigated from experimental and FEA approaches. Based on displacement-controlled bending and inelastic hysteresis energy fatigue damage criterion, the interior deformation, energy absorption, and stress distribution characteristics during the fatigue process were analyzed. The different failure mechanisms and damage patterns of yarns and resin were discussed. The influence of the 3D woven structure on the fatigue behaviors was discussed. The fatigue damage morphologies and stiffness degradation were obtained to compare with the experimental results. The results show that the most of energy was absorbed by warp yarns. Stress concentration was emerged on the inclined part of warp yarns and the interface between yarns and resin. The damage morphologies from experimental and FEA results are in good agreement. The stiffness degradation curves also show the same tendency.