本文選題：非高斯風(fēng)場 + 風(fēng)場模擬��； 參考：《哈爾濱工業(yè)大學(xué)學(xué)報(bào)》2017年12期

【摘要】：為分析非高斯風(fēng)荷載作用下風(fēng)機(jī)結(jié)構(gòu)的疲勞壽命,在穿越模型基礎(chǔ)上,根據(jù)Monte Carlo模擬生成某典型風(fēng)機(jī)正常風(fēng)速條件下,高斯、非高斯硬化和軟化3種風(fēng)場的風(fēng)速時(shí)程,用于分析風(fēng)場的非高斯性對風(fēng)機(jī)結(jié)構(gòu)疲勞損傷的影響.由葉片的氣動(dòng)模型和多體動(dòng)力,計(jì)算出風(fēng)機(jī)的動(dòng)力響應(yīng),并對響應(yīng)的時(shí)域特性進(jìn)行分析.基于線性損傷累積和線性裂紋擴(kuò)展理論,對裂紋形成壽命和裂紋擴(kuò)展壽命進(jìn)行詳細(xì)討論.結(jié)果表明:不同概率特性風(fēng)場作用下風(fēng)機(jī)動(dòng)力響應(yīng)的最大值有所不同,且風(fēng)機(jī)響應(yīng)的非高斯性較風(fēng)場的非高斯性減弱;在年平均風(fēng)速較小地區(qū),風(fēng)場的非高斯性對風(fēng)機(jī)疲勞壽命影響較小;但隨著年平均風(fēng)速的增大,非高斯性對疲勞壽命的影響顯著增大,當(dāng)年平均風(fēng)速為7 m/s和9 m/s時(shí),相較于高斯風(fēng)場,軟化過程的裂紋形成壽命減小約10%.因此,在年平均風(fēng)速較大地區(qū),需要考慮風(fēng)場的軟化特性對風(fēng)機(jī)結(jié)構(gòu)疲勞損傷的影響.
[Abstract]:In order to analyze the fatigue life of fan structure under non- wind load, based on the crossing model, the wind velocity history of a typical fan under normal wind speed conditions was generated according to Monte Carlo simulation. The effect of non-Gao Si of wind field on fatigue damage of fan structure is analyzed. The dynamic response of the fan is calculated from the aerodynamic model of the blade and the multi-body force, and the time domain characteristic of the response is analyzed. Based on the theory of linear damage accumulation and linear crack propagation, the crack forming life and crack propagation life are discussed in detail. The results show that the maximum value of fan dynamic response is different under different probability characteristics of wind field, and the non- property of fan response is weaker than that of wind field, and the annual average wind speed is smaller in the area where the wind speed is small. The non- effect of wind field on the fatigue life of fan is relatively small, but with the increase of annual average wind speed, the influence of non- property on fatigue life increases significantly. When the average wind speed is 7 m / s and 9 m / s, the wind field is different from that of Gao Si wind field. The crack forming life of softening process is reduced by about 10%. Therefore, the influence of the softening characteristics of wind field on the fatigue damage of fan structure should be considered in the area with large annual average wind speed.
【作者單位】： 北京科技大學(xué)土木與資源工程學(xué)院;北京科技大學(xué)強(qiáng)震區(qū)軌道交通工程抗震研究北京市國際科技合作基地;
【基金】：國家自然科學(xué)基金(51178045) 北京科技大學(xué)與臺(tái)北科技大學(xué)專題聯(lián)合研究計(jì)劃(TW201601) 高校2016年度引智項(xiàng)目(110000201420160126)
【分類號(hào)】：TU312.1
，

本文編號(hào)：1801073