振动与冲击
振動與遲擊
진동여충격
JOURNAL OF VIBRATION AND SHOCK
2015年
11期
99-104
,共6页
李正良%刘欣鹏%晏致涛%肖正直%俞登科
李正良%劉訢鵬%晏緻濤%肖正直%俞登科
리정량%류흔붕%안치도%초정직%유등과
遮挡型格构式塔架%风洞试验%风力系数%功率谱%解析模型
遮擋型格構式塔架%風洞試驗%風力繫數%功率譜%解析模型
차당형격구식탑가%풍동시험%풍력계수%공솔보%해석모형
occluded latticed tower%wind tunnel test%wind force coefficient%power spectrum%analytical model
基于高频天平测力技术,对遮挡型格构式塔架模型进行不同遮挡距离、不同试验风速下的风洞试验,研究其对遮挡型格构式塔架顺风向、橫风向、扭转向平均风力系数以及对顺风向、橫风向基底弯矩功率谱的影响,并在此基础上利用最小二乘法对两个方向的功率谱进行了参数拟合。结果表明,遮挡距离是影响平均风力系数的重要影响因素,而试验风速仅对橫风向平均风力系数有影响;与平均风力系数相反,对于基底弯矩功率谱而言,试验风速对其影响显著,而遮挡距离在整个频段上对功率谱密度影响并不大;特定工况下极值脉动功率谱拟合效果较好,可用于遮挡型格构式塔架动力响应的频域计算中。
基于高頻天平測力技術,對遮擋型格構式塔架模型進行不同遮擋距離、不同試驗風速下的風洞試驗,研究其對遮擋型格構式塔架順風嚮、橫風嚮、扭轉嚮平均風力繫數以及對順風嚮、橫風嚮基底彎矩功率譜的影響,併在此基礎上利用最小二乘法對兩箇方嚮的功率譜進行瞭參數擬閤。結果錶明,遮擋距離是影響平均風力繫數的重要影響因素,而試驗風速僅對橫風嚮平均風力繫數有影響;與平均風力繫數相反,對于基底彎矩功率譜而言,試驗風速對其影響顯著,而遮擋距離在整箇頻段上對功率譜密度影響併不大;特定工況下極值脈動功率譜擬閤效果較好,可用于遮擋型格構式塔架動力響應的頻域計算中。
기우고빈천평측력기술,대차당형격구식탑가모형진행불동차당거리、불동시험풍속하적풍동시험,연구기대차당형격구식탑가순풍향、횡풍향、뉴전향평균풍력계수이급대순풍향、횡풍향기저만구공솔보적영향,병재차기출상이용최소이승법대량개방향적공솔보진행료삼수의합。결과표명,차당거리시영향평균풍력계수적중요영향인소,이시험풍속부대횡풍향평균풍력계수유영향;여평균풍력계수상반,대우기저만구공솔보이언,시험풍속대기영향현저,이차당거리재정개빈단상대공솔보밀도영향병불대;특정공황하겁치맥동공솔보의합효과교호,가용우차당형격구식탑가동력향응적빈역계산중。
Based on high-frequency-force-balance technique,a model of an occluded latticed tower was tested in a wind tunnel under conditions of 3 kinds of wind speed,and 6 kinds of occluding distance to investigate mean force coefficients and power spectral densities(PSDs)of base moment.Based on these results,the analytical models of PSD for the base moment in two directions were fitted by applying the least-square method.It was shown that the occluding distance is an important factor to affect mean force coefficients;however,the wind speed is an important factor to affect PSDs of base moment;the analytical models of PSD of base moment agree well with the experimental results obtained with wind tunnel tests,they can be used to calculate wind-induced dynamic responses of occluded latticed towers in frequency domain.