文章摘要
曾永顺,姚志峰,杨正军,王福军.非对称尾部形状水翼水力阻尼识别方法研究[J].水利学报,2019,50(7):864-873
非对称尾部形状水翼水力阻尼识别方法研究
Study on hydrodynamic damping identification for an asymmetrical trailing edge shape hydrofoil
投稿时间:2018-11-23  
DOI:10.13243/j.cnki.slxb.20181051
中文关键词: 非对称  尾部形状  水翼  水力阻尼比  识别方法
英文关键词: asymmetric  trailing edge shape  hydrofoil  hydrodynamic damping ratio  identify method
基金项目:国家自然科学基金项目(51879266,51839001);国家重点研发计划(2017YFC0403206)
作者单位E-mail
曾永顺 中国农业大学 水利与土木工程学院, 北京 100083  
姚志峰 中国农业大学 水利与土木工程学院, 北京 100083
北京市供水管网系统安全与节能工程技术研究中心, 北京 100083 
yzf@cau.edu.cn 
杨正军 中交天津航道局有限公司, 天津 300461
天津市疏浚工程技术企业重点实验室, 天津 300461 
 
王福军 中国农业大学 水利与土木工程学院, 北京 100083
北京市供水管网系统安全与节能工程技术研究中心, 北京 100083 
 
摘要点击次数: 93
全文下载次数: 71
中文摘要:
      水力阻尼是影响流激振动幅值预测精度的关键参数,是水力机械流激振动领域研究的热点问题。非对称尾部形状水翼在涡激振动和升力的联合作用下,振动响应的平衡位置具有时变特性,采用传统自由振动衰减法获得的水力阻尼比误差大幅度增加,甚至失效。为了克服传统自由振动衰减法应用局限,本文借助双向流固耦合数值模拟方法获得流激振动响应位移,通过带通滤波结合平衡位置校准,研究了动水环境中对称和非对称尾部形状水翼水力阻尼的识别方法。结果表明,数值模拟可较准确获取低阶结构模态和尾部旋涡脱落频率,相比实验结果,低阶弯曲模态频率、低阶扭曲模态频率和15 m/s流速下脱落涡频率最大偏差分别为7.58%、2.90%和1.42%;带通滤波可消除周期性涡激振动对响应信号的影响,水力阻尼比识别偏差度从7.51%下降到1.92%;平衡位置校准方法可采用多项式拟合法、线性插值法和光滑样条曲线法,所对应的水力阻尼比识别偏差度分别为34.93%、3.53%和0.16%。工程上,可优先推荐滤波结合线性插值法,在需要高精度水力阻尼比的场合,则必须采用滤波结合光滑样条曲线法。
英文摘要:
      Hydrodynamic damping is a critical parameter that affects the prediction accuracy of the vibration amplitude induced by flow, which is a hot issue in the field of the flow induced vibration of the hydraulic machinery. Due to the comprehensive effects of vortex-induced vibration and lift,the equilibrium position of the vibration of the asymmetric trailing edge shape hydrofoil has a time-variant characteristic. Therefore, the hydrodynamic damping ratio identified by traditional logarithmic decay method may have large deviation or even invalid. In order to overcome the limitation of the traditional free vibration method, the hydrodynamic damping identification methods of the hydrofoil with symmetrical and asymmetric trailing edge shapes in moving water were studied by combining bandpass filtering and equilibrium position calibration. The vibration induced by flow was obtained by a two-way fluid-structure numerical simulation, the first-order and second-order natural frequencies in water and the vortex shedding frequencies have good agreement with the experiments. The relative deviations are 7.58%, 2.90% and 1.42%, respectively. The vortex-induced vibration was eliminated by performing bandpass filtering, and the deviations of the identified hydrodynamic damping ratio decreased from 7.51% to 1.92%. The polynomial fitting method, the linear interpolation method and the smooth spline curve method were used in the calibration of the equilibrium position, and the deviations of identified hydrodynamic damping ratio were 34.93%, 3.53% and 0.16%, respectively. In order to reduce the time consumption of the vibration data processing, the methods of coupling filter and linear interpolation are recommended in engineering. However, the method coupled filter and smooth spline curve must be employed in the cases that the high-precision hydrodynamic damping ratio are required.
查看全文   查看/发表评论  下载PDF阅读器
关闭