共查询到19条相似文献,搜索用时 218 毫秒
1.
2.
3.
以橡胶球铰几何参数、胶料硬度和球铰预压缩量为设计变量,以球铰刚度为目标函数并基于实验设计方法对整个设计空间进行了采样;根据所采样本的数据库建立了橡胶球铰几何参数-球铰刚度神经网络近似模型;基于该模型并借助Isight软件,编制了橡胶球铰结构快速设计模板;使用该模板可进行球铰刚度快速匹配和结构优化设计。以某型齿轮箱吊杆用橡胶球铰为例,验证了该模板计算精度的可行性。结果表明,使用该模板可大幅缩短橡胶球铰的开发时间并提高其疲劳性能和使用寿命,该模板计算精度的可行性较好,达到工程应用标准。 相似文献
4.
5.
6.
7.
针对金属-橡胶球铰扭转刚度试验,分析了2种金属-橡胶球铰的结构与工作原理,设计了球铰水平纯扭转、垂直压缩扭转、组合扭转、系统扭转和组对扭转5种试验方案,并进行了分析对比;研究了不同径向预载荷、扭转速度和扭转方式对球铰扭转刚度的影响。结果表明,试验设计与实际工况一致;水平纯扭转和垂直压缩扭转2种试验方式均适用刚度试验;当增加径向预载荷或增大扭转速度时,球铰扭转刚度变大,单边加载扭转刚度大于正反加载扭转刚度。 相似文献
8.
9.
10.
11.
当前我国国民经济飞速发展,随着人们对于出行要求的不断提高,汽车的数量也在快速增加。橡胶衬套广泛应用于汽车悬架,其能够很好的起到减震的作用,也能够大大提高汽车悬架的使用寿命。作为汽车悬架的重要部件,橡胶衬套的静刚度很大程度上会影响汽车的NVH性能,刚度越小减震效果越好,但容易引起共振带来抖动,反之,静刚度过大不利于隔离震动,因而对于橡胶衬套静刚度的测试分析十分有必要。合适的静刚度能够最大限度地提高车辆行驶的舒适性,也能够在一定程度上保证行车安全。以下就橡胶衬套静刚度的有限元分析与测试技术进行简要的分析研究。 相似文献
12.
针对漏板不同步升温造成的危害,研究了漏板同步自动升温的程序设计。分析了主程序与单块漏板控制程序的运行,对比了热漏板与新漏板升温过程,完成升温速率的计算,对单块漏板控制程序进行是否与主程序建立链接和断开链接的计算,以及升温完成后执行恒温控制。 相似文献
13.
ABSTRACTIn the present work the influence of notch size on the fatigue damage behaviour of toughened epoxy adhesive specimens is investigated. Notched and un-notched bulk adhesive specimens were fatigue tested at room temperature under tension-tension cyclic loading at a stress ratio of 0.1. The investigation was based on the analysis of fatigue life (SN) and stiffness degradation curves, which were correlated with notch size and applied stress. Finite element analysis (FEA) was carried out in order to evaluate the notch-dependent stress concentrations. Fatigue results evidenced a reduction of lifespan with increased applied stress amplitude and a possible relationship between the inverse slope of SN curves and notch size. Most notched samples exhibited lower fatigue strength in comparison to un-notched, except in the low cycle fatigue range where un-notched and notched samples had similar fatigue strength. Stiffness degradation showed a correlation with applied stress, i.e. an increase in applied stress was accompanied by faster and stronger degradation. For higher loads, un-notched and 0.2 mm notch samples presented greater stiffness degradation prior to failure than other notched samples. 相似文献
14.
15.
模拟涵洞受力状态下的玻璃钢夹砂管进行室内疲劳试验,试验研究表明,玻璃钢夹砂管管涵经250万次疲劳加载后,承载力和环刚度降低不显著,没有发生分层开裂和脆断,完全符合公路涵洞实际应用要求。在室内疲劳试验基础上,提出了符合公路规范的玻璃钢夹砂管疲劳寿命的预测公式,并分析了影响玻璃钢夹砂管疲劳性能的因素,为玻璃钢夹砂管在公路涵洞推广使用中的耐久性设计提供了可靠的分析基础。 相似文献
16.
17.
酸性气体脱除单元副产的二氧化碳可作为粉煤气化装置载气循环利用,但其夹带微量甲醇,需经过处理才能达标排放。以某二氧化碳需求量为20000 m3/h的粉煤气化装置为例,分析对比了压缩机段间洗涤和压缩前洗涤两种水洗法脱除二氧化碳中微量甲醇的方案,结果发现水洗法脱除甲醇的方案可行,且压缩机段间洗涤方案较压缩前洗涤方案安全性更高,设备费用更低,能耗低15.5%,每小时可省操作费用105.1元。初步探讨了吸附法用于脱除二氧化碳中微量甲醇的可行性。 相似文献
18.
The temperature increase in flexural fatigue testing of sheet-molding compound SMC-R65 is investigated within a range of testing frequencies from 1000 cpm to 2200 cpm. Variation of the testing frequency affects the temperature increase and, based on 10 percent reduction in flexural stiffness, the effect of changing frequency on the fatigue lives was not detected. Steady-state temperatures are obtained in the case of specimens tested in air. A temperature analysis is carried out that gives reasonable agreement with experimental values. 相似文献
19.
《塑料、橡胶和复合材料》2013,42(9):458-462
AbstractPrediction of damage progress based on measurements of the stiffness and damping changes has been suggested. A model is proposed based on experimental measurements of the rate of decrease of stiffness at given stress or strain levels. The fatigue damage was recorded by measuring the stiffness and the damping changes in the material under cyclic loading.A fatigue testing technique including full control of the test parameters was developed for online measurements of the initial values and the changes in the complex stiffness properties (elasticity and damping). The testing technique was based on a separate adaptive control of the test system using an A-D–D-A interface card in a personal computer setup as an external function generator to the test machine servo loop. The system is test machine independent and the setup and programmes can be used in any servo controlled test system. Further, by use of this control technique it is possible to increase the test frequency by a factor of 2–3 compared with the ability of a standard test system. The technique is described and its use is illustrated by tests on glass–polyester composites under fatigue loading. 相似文献