一款车型进气降噪分析及处理

介绍一款高端车型的进气降噪方案分析及处理:使用UG、HyperWorks等专业软件进行分析,选择其中最合适的方案作为此次降噪的最终方案;并完成实车进气噪音验证,最后验证结果达到了预期降噪目标。该最优方案后续在量产车上进行实施,其降噪效果得到客户的认可。     

注塑件翘曲变形分析及其解决途径

本文从注塑件的结构、模具机构、注塑工艺参数等几方面阐述了翘曲变形的机理,分析了注塑件收缩对翘曲变形的影响,并以实例分析如何解决注塑件的翘曲变形。     

某车型尾门装饰条变形分析

尾门装饰条受热胀冷缩影响,容易变形或断裂;针对某车型尾门装饰条变形的现状,利用理论和实际相结合以及CAE分析手段分析在不同工况下尾门装饰条的变化量,综合查找导致装饰条变形原因,并根据具体原因制定整改对策,根据装饰条热胀冷缩的原理,对策主要包含两个方面,一是变形量得到释放,二是改善尾门装饰条本身的变形量;这两个方面的实施改善了尾门装饰条变形的问题。     

某车型后桥壳总成变形弯曲的分析研究

某载货汽车后驱动桥采用中段铸造两端插管式的后桥壳总成,其使用过程中出现变形、弯曲、渗油的问题。研究此类后桥壳总成变形弯曲问题主要从桥壳垂直弯曲疲劳、静强度和刚度试验、制造误差引起套管壁厚不均匀的桥壳强度与刚度的CAE分析、插管处过盈量增大对变形量的影响这些方面着手。经过分析可知,由于长期承受繁重的冲击载荷,服役环境恶劣,此种结构后桥壳总成往往先表现出变形弯曲及渗油的现象。通过研究分析进一步深入了解到,此种结构后桥壳总成薄弱位置在套管与铸造减壳过渡的地方,此处截面积变化大,施加载荷后此处应力也最大,整体桥壳的刚性相比其他结构桥壳差,为产品设计开发的最初结构选型提供很好的指导意义;当机加工过程引起的套管壁厚不均匀在一定范围内时,经CAE分析对后桥壳总成的刚性无明显影响,但其强度有所降低,应采用适合的加工工艺以减小制造偏差,并加严控制套管原材料的壁厚差;插管处的过盈量增大可以提高防松脱能力,但对提升桥壳刚性和强度基本没有贡献,无法解决桥壳变形引起的渗油问题。     

饲料冷却器格栅的有限元分析与优化设计研究

饲料冷却器是降低热饲料温度的一种换热器,格栅作为饲料冷却器中的主要结构,主要起到支撑冷却器以及排料的作用。在饲料的生产加工过程中发现,由于饲料冷却器三层格栅的变形不匹配,容易导致冷却器中的饲料发生卡料现象。通过对饲料冷却器的现场测试,获得了各层格栅的变形及平均应力分布情况。根据测试得到的数据,运用ANSYS有限元程序反推格栅各层的载荷分布规律。在此基础上,对格栅结构进行了改进设计,改善了饲料冷却器的卡料问题。     

熔融沉积薄壁件产生翘曲变形分析及优化

针对熔融沉积薄壁件易产生翘曲变形的问题,采用建立翘曲变形数学模型,设计正交试验,极差分析的方法,对沉积厚度、喷头温度、托盘温度以及填充率4个工艺参数进行研究,得出各参数对翘曲变形量影响的重要因子。结果表明,沉积厚度0.4mm,喷嘴温度225℃,托盘温度70℃,填充率20%时,此时薄壁件的翘曲变形量最小,翘曲量0.392 mm。因此,影响翘曲变形的主次顺序:沉积厚度>喷嘴温度>托盘温度>填充率,理论分析与实验结果一致,并得出各工艺参数对翘曲量的变化。优化设计后工艺参数,产品的翘曲变形量减小86.2%,为成型薄壁件过程减少翘曲变形提供一定参考。     

复合材料层压结构变形机理分析及解决措施

系统的分析了运8飞机水平尾翼防冰前缘层压结构在固化成型过程中发生翘曲变形的各种原因,在此基础上,重点从工艺方法、设计选材和模具三方面提出改进措施,通过试验研究,对铺层方式和固化方法进行了改进,改进后成型出的前缘零件翘曲变形量大幅降低,满足设计要求.     

不同进气角度下轴向转动孔流动特性实验研究

为了研究轴向转动孔的流动特性,在旋转试验台上对轴向进气与预旋45°进气的轴向转动孔,进行了不同压比（1.05～1.3）与不同转速（0～9000r/min）下流动特性的实验研究。研究结果表明：随着压比增加,轴向进气转动孔流量系数增加,最大增幅为12.74%;而预旋45°进气时,流量系数先增后减,最大变化幅度为21%。随着转速增加,轴向进气转动孔流量系数降低,最大降幅为24.02%;而预旋45°进气时,流量系数先增后减,最大变化幅度为14.4%。同压比下,气流预旋45°进气时流量系数随转速变化的幅度显著小于轴向进气,流量大小更加稳定。     

大型薄壁塑件翘曲变形分析及工艺参数优化

在注塑成型大型薄壁塑料产品过程中,由于熔料流动路程长,流动阻力大,产品极易产生翘曲变形,从而影响到使用性能.应用Moldflow软件分析了影响产品翘曲变形的主要原因是收缩率不均引起.通过优化工艺参数,即优化保压曲线,减小了产品翘曲变形.方珐是将保压设置由恒压保压调整为先恒压再线性递减的两段保压,然后再多次调整保压曲线各...     

某柴油发动机缸孔变形分析及优化

采用计算流体动力学CFD(Computational Fluid Dynamics)与有限元FEA(Finite Element Analysis)耦合分析方法,建立缸体缸盖温度场模型和缸体缸盖强度分析模型.通过计算流体动力学分析计算了发动机额定工况下的缸内燃烧热负荷及缸内水套冷却边界,有限元分析加载装配预紧力及最大爆...     

A study of the Taguchi optimization method for surface roughness in finish milling of mold surfaces

The objective of this paper is to develop a Taguchi optimization method for low surface roughness in terms of process parameters when milling the mold surfaces of 7075-T6 aluminum material. Considering the process parameters of feed, cutting speed, axial-radial depth of cut, and machining tolerance, a series of milling experiments were performed to measure the roughness data. A regression analysis was applied to determine the fitness of data used in the Taguchi optimization method using milling experiments based on a full factorial design. Taguchi orthogonal arrays, signal-to-noise (S/N) ratio, and analysis of variance (ANOVA) are used to find the optimal levels and the effect of the process parameters on surface roughness. A confirmation experiment with the optimal levels of process parameters was carried out in order to demonstrate the effectiveness of the Taguchi method. It can be concluded that Taguchi method is very suitable in solving the surface quality problem of mold surfaces.     

冷辗扩工艺中环件锻透变形的数值分析与试验

冷辗扩机床是目前世界上生产轴承套圈的先进设备.在辗压环件过程中存在着接触非线性和材料非线性双重复杂的变化过程.采用ANSYS有限元分析软件对复杂的辗扩过程进行数值仿真.根据锻透条件,计算出不同工况条件下的最小辗压力,为模具的设计及进给机构参数设计提供了依据.同时进行试验验证分析.     

军用某型牵引车车架静动态特性分析

建立了以板壳单元为基本单元的车架有限元分析模型,利用ANSYS软件对该车进行静态和动态特性分析。根据计算结果分析表明,文中所涉及的建模和分析手段是行之有效的。并从车架特性上找到一些影响该车在不同工况下行驶出现车架变形、断裂等情况的因素。     

汽车排气系统的模态实验分析

汽车排气系统的振动是影响汽车振动噪声和舒适度的主要因素之一,掌握其动态特性对优化汽车的NVH性能十分重要.针对某国产轿车的排气系统进行研究,利用B&K数据采集与分析系统对排气系统进行了自由状态下水平和垂直两个方向的测试和工况状态下的垂直方向的测试,得到了排气系统的主要固有频率和振型,为整车减振降噪水平的改善提供了的有效依据.     

Optimal locations of heaters in a shoe outsole rubber injection mold using FEA and parametric analysis

Temperature control of a rubber injection mold is important for the dimensional accuracy of the product. In this study, the arrangement of mold heater cartridges was optimized by using finite element analysis (FEA) and experiments. First, a heat transfer analysis was performed about the rubber mold currently used in a factory. The locations of heater cartridges were modified based on the analytic results. A FE analysis was then performed to improve the rubber mold and experiments were conducted to validate the FE analysis. The FE analysis was in good agreement with the experimental results. Design factors were selected for the arrangement of heater cartridges. Based on parametric analysis, we propose an optimal design method for the arrangement of heater cartridges in the rubber injection mold, thereby improving the outsole mold design.     

Theoretical and experimental analysis of material deformation by microcontact

This paper reports on an investigation of contact damage induced in molds and substrate materials used in micro- and nanoimprint lithography. Silicon, polydimethylsiloxane (PDMS), glass, and silicon carbide were studied. A finite element analysis using ABAQUS software was conducted to investigate the stress induced in mold and substrate materials when they come in contact with each other at a uniaxial pressure of 1 MPa. A spherical indentation experiment was conducted for a model study for various indentation loads and numbers of contact cycles. We examined the contact damage during the spherical indentation. Indentation stress-strain curves, surface views of contact damage, and mechanical properties were characterized for the mold and substrate materials.     

基于Pro/E留置针导管座注塑模设计

充分分析导管座的结构和特点,运用Pro/E软件准确、快速的生成型芯和型腔部分,并使用模具设计专家EMX进行模架和其他零件的设计、装配。应用Pro/E大大缩短了设计周期,提高了生产效率,降低了成本。     

基于感测控制的钢轨承载变形实验研究

本文有针对性的对承载的钢轨从理论和实验两方面进行应力应变分析,得出相关的数值及其分布规律,并作出了枕上钢轨轨腰处作为感测对象最为显著的结论,同时提出了利用应力集中提高感测灵敏度的新理念。为基于火车自动控制的传感器研发提供了依据。     

电动汽车整车性能测试分析

以某款电动汽车为例,基于国标要求对其样车的最高车速、滑行能力、加速性能、制动性能、爬坡能力以及能量消耗率和续航里程进行测试,并对测试结果进行分析.结果表明:被测车辆整车性能基本满足设计要求,对剩余电量的估算及整车的能量消耗率还需要进一步优化.     

The use of simulation modeling and factorial analysis as a method for process flow improvement

Over the past quarter century, much effort has been devoted to the design and development of simulation modeling languages, and to methods for the development of simulation models themselves. Less effort, however, has been expended on the design of the experimental models upon which simulation studies are based. This paper describes a methodology for the determination of near optimal solutions considering experimental design and simulation modeling. Using this methodology, simulation scenarios are created and analyzed using an analysis of variance (ANOVA)-based experimental design. This paper also presents an application of this method in analyzing a manufacturing system design problem.