Investigating the impact of non‐linear geometrical effects on wind turbine blades—Part 1: Current status of design and test methods and future challenges in design optimization

This article is the first part of a three‐article series and it deals with full‐scale tests of a load‐carrying box girder. The two other articles present more details on smaller sub‐component levels as well as cap specimens (article 2) and shear webs (article 3). This article also links to the two other articles and brings the main results from them into relevance for a wind turbine blade designer. The investigated failure modes in all three articles relate to the Brazier effect, which is expected to be the key dominating failure mechanism in future wind turbine blade designs. The Brazier effect may also have a significant impact on present wind turbine blades. In this article, a 34 m long load‐carrying box girder has been tested in static flap‐wise bending, and it has been demonstrated that, for this design, the Brazier effect is a critical phenomenon of great relevance for the ultimate failure strength. The box girder has been evaluated with and without a cap (wire) reinforcement. The cap reinforcement is one out of seven inventions Risø DTU published in 2008, which are all intended to result in a lighter and more reliable blade design. Copyright © 2010 John Wiley & Sons, Ltd.     

轴流透平多截面气动设计方法研究

本文基于完全径向平衡方程,研究发展了一套多级轴流透平多截面气动设计方法和叶片造型方法.采用该方法对某型燃气轮机四级透平进行了气动设计,并对设计出的透平进行了三维定常流场计算,结果表明,三维计算结果与设计结果吻合较好.     

氰化尾液除铜 提高金氰化浸出率实践

松树南沟金矿氰化厂尾液含铜高,耗氰量大,金浸出率达不到设计指标。为解决这个问题,进行了长时间的试验研究。根据试验结果,采用两步沉淀法除铜、尾液全循环工艺,并进行了工业试验。试验结果表明,采用该工艺可以从氰化尾液中回收铜,提高金氰化浸出率,实现氰化尾液全循环。     

全膜法工艺制备锅炉补给水存在的问题及解决

"超滤+反渗透+EDI"的全膜法工艺应用了最新的膜分离技术来制备锅炉补给水,超滤良好的产水水质能够给反渗透膜提供最佳的保护,而替代传统混床的电除盐(EDI)技术则彻底消除了酸碱的使用和废水排放。但因各地水源不同,该系统在运行过程中也存在一定的缺陷,应根据各地水源的不同作相应的改造,经改造后的系统在热电厂的实际运行结果表明,系统运行可靠,管理方便,产水水质完全能够满足锅炉用水要求。     

车辆半主动悬架联合仿真分析

以多体动力学仿真软件SIMPACK为平台,建立昌河某微型轿车的整车模型,采用模糊控制策略,在联合仿真模块SIMAT中对整车进行了随机路面输入和脉冲输入仿真试验。结果表明,与被动悬架相比,联合仿真环境下,模糊控制的半主动悬架车辆可以有效衰减车体振动,改善整车的平顺性。     

非匀速平飞模式下双基地SAR成像分析

该文研究了收发平台非匀速平飞模式下的双基地SAR成像问题。首先构建收发非匀速平飞模式的几何场景,并通过对回波瞬时收发距离的分析得到了双基地SAR回波的近似模型。收发平台速度变化使得波束不同步,导致SAR数据在方位向非均匀采样,该文首先分析了将非匀速平飞双基地模型等效成单基地变速运动模型的方法,然后采用非均匀傅里叶变换处理变速运动引起的非均匀采样的问题。多组不同条件下的仿真实验表明双基地SAR图像质量较好,验证了该文方法的有效性。     

Characterisation of Indentation‐Induced Pattern Using Full‐Field Strain Measurement

Abstract: In this study, digital image correlation (DIC)‐based strain analysis software was successfully developed. Its strain resolution lies in the order of 2.3 × 10^?4–3.1 × 10^?4. Full‐strain field measurement was used to study indentation‐induced plastic patterns around the spherical indenter for a polycrystal and a single crystal of pure aluminium. During indentation, the pure aluminium specimen of the single crystal revealed a symmetric indentation pattern of von Mises strain. The piling‐up around the residual impression was successfully and directly characterised by examining the sign of strain ?_X and ?_Y in the X and Y directions. However, the inward, out‐of‐plane movement results in an error in calculating in‐plane strain referred to as a ‘distortion strain’ using two‐dimensional DIC.     

工程施工企业全成本核算与管理

施工企业全成本核算的新增要素主要有资金成本和工资费用2个方面。施工企业全成本核算模式与方法有直接分配法、辅助核算法和台账法等。     

全数字单点采集技术在四川盆地的应用

根据地震勘探采集的要求,合理选用检波器至关重要。利用数字单点检波器频带宽、动态范围大的优势,在四川盆地川西地区开展了系统的试验,获得了比常规模拟检波器采集分辨率高的资料。通过对采集到的模拟检波器和数字检波器地震数据的单炮记录、叠加剖面进行对比分析,认为应用全数字单点采集技术获得的地震资料,不仅单炮原始记录的分辨率比模拟检波器高,而且叠加剖面的波组特征清楚、同相轴连续性好、反射信息丰富。表明全数字单点采集技术有很好的应用前景。