排序方式: 共有17条查询结果,搜索用时 15 毫秒
11.
12.
To reasonably design the blade-tip radial running clearance(BTRRC) of high pressure turbine and improve the performance and reliability of gas turbine, the multi-object multi-discipline reliability sensitivity analysis of BTRRC was accomplished from a probabilistic prospective by considering nonlinear material attributes and dynamic loads. Firstly, multiply response surface model(MRSM) was proposed and the mathematical model of this method was established based on quadratic function. Secondly, the BTRRC was decomposed into three sub-components(turbine disk, blade and casing), and then the single response surface functions(SRSFs) of three structures were built in line with the basic idea of MRSM. Thirdly, the response surface function(MRSM) of BTRRC was reshaped by coordinating SRSFs. From the analysis, it is acquired to probabilistic distribution characteristics of input-output variables, failure probabilities of blade-tip clearance under different static blade-tip clearances δ and major factors impacting BTRRC. Considering the reliability and efficiency of gas turbine, δ=1.87 mm is an optimally acceptable option for rational BTRRC. Through the comparison of three analysis methods(Monte Carlo method, traditional response surface method and MRSM), the results show that MRSM has higher accuracy and higher efficiency in reliability sensitivity analysis of BTRRC. These strengths are likely to become more prominent with the increasing times of simulations. The present study offers an effective and promising approach for reliability sensitivity analysis and optimal design of complex dynamic assembly relationship. 相似文献
13.
集电系统作为海上风电场的重要组成部分,其内部海缆的选型与网络连接直接影响到其运行经济性。针对海上风电场集电系统拓扑经济优化问题,为获取兼顾工程实际性和经济性的拓扑结构,首先对集电系统中海缆的避障、升压站的进线限制和海缆交叉规避进行了分析,并针对含多升压站和障碍区的集电系统拓扑优化问题,提出了求解最小拓扑生成树的改进prim算法,平衡了各进线集合的风机数量,从而保证了海缆选型的有效性。在此基础上,以总经济成本最小为目标,提出了集电系统拓扑经济优化模型。鉴于模型的非线性与高度复杂性,将原模型转化为含经济优化模型和拓扑优化模型的双层优化模型,模型采用遗传算法和改进prim算法进行迭代求解。以汕头海域深水海上风电场实际项目为例进行验证分析,结果表明:该方法能有效求解含多升压站和障碍区的集电系统拓扑优化问题,优化结果在海缆总长度和总经济成本方面分别较现有方法下降了9.91%和9.04%,算法的求解精度得到了提升。 相似文献
15.
采用喷雾干燥法对富含γ-氨基丁酸(γ-aminobutyricacid,简称GABA)的麦胚孵育液进行干燥熟化,研究喷雾干燥进料速度、进风温度和喷雾压力对麦胚粉冲调性能的影响。运用Mixture-D-Optimal混料设计和模糊综合评价法对麦胚粉、黄豆粉、燕麦粉、白砂糖混合,研究麦胚营养粉的最佳配方。结果表明,在喷雾压力0.7 MPa,进料速度0.9 L/h,进风温度130 ℃时,麦胚粉的溶解时间最短,为38 s。产品配方试验得出,麦胚营养粉的最优配方为麦胚含量42%,黄豆粉含量28%,燕麦粉含量23%,白糖含量7%,此时产品的感官评分为3.83分。模糊综合评价表明,以此配方生产的麦胚粉达到“较喜欢”级别。产品色泽浅黄,有浓郁的豆香和麦香味,其中GABA含量为1.02%。 相似文献
16.
在对装配体进行模态分析时,装配体接触面间的法向接触刚度对计算结果具有很大影响,但在实际中由于处理困难却往往被省略。基于有限元建模方法分析了装配体接触面法向接触刚度对装配体振动模态的影响。首先,根据接触力学理论推导了法向接触刚度与接触表面粗糙度和接触应力之间的关系;然后,探讨了通过改变层单元弹性模量来模拟法向接触刚度的有限元建模方法;最后,通过算例分析了考虑与不考虑接触刚度时振动模态的差异。研究结果表明,考虑法向接触刚度的有限元等效模型计算结果与解析解非常接近,不考虑接触刚度的整体模型计算结果与解析解异较大,一般超过了10%以上,且频率越低差异越大,另外振型也有明显差异。本文建立的有限元建模方法可用于研究法向接触刚度对装配体振动模态的影响。 相似文献
17.