摘要
双曲薄壳冷却塔振型复杂、群塔干扰及风振效应突出,风洞试验中常采用连续介质薄壳材料模拟冷却塔气弹模型缩尺刚度。鉴于该方法气弹模型设计和加工的特点,在实际工程应用中存在多方面不足。针对存在的问题,提出了双曲薄壳冷却塔气弹模型等效梁格设计方法,推导了梁格法冷却塔气弹模型缩尺刚度计算公式,建议了冷却塔缩尺模型模拟原型结构高雷诺数条件下表面绕流Reynolds数和Strouhal数效应修正和验证办法。设计加工1∶200比例等效梁格冷却塔气弹模型,在同济大学TJ-3风洞中,进行了冷却塔单塔测振风洞试验,在模型频率、振型、气动力参数模拟,风振系数分布和试验易操作性方面均取得良好的较果,较好地避免了传统连续介质模型设计方法的不足。
Hyperbolic thin-shell cooling towers have complicated vibration modes, and are very sensitive to the effects of group towers and wind-induced vibration. The aero-elastic models of cooling tower in wind tunnel tests are usually designed based on the method of stiffness simulation by continuous material structure. However, the method has some shortages in actual engineering application, so the so-called“equivalent beam-net design method”of aero-elastic model of cooling tower is proposed in this paper. Reduced-scale stiffness algorithm of cooling tower model is formulated firstly, and corresponding modification and simulation methods about aerodynamic effects of Reynolds and Strouhal number are also suggested. An aeroelastic model of 1：200 ratio of cooling tower was manufactured using beam-net method, then in Tongji university TJ-3 wind tunnel, dynamic response tests were carried out. It can be confirmed that vibration modes and aerodynamic parameters, windvibration factors and testing feasibility meet the requirement of wind tunnel tests, the proposed method can avoid the shortages of traditional method.
出处
《振动工程学报》
EI
CSCD
北大核心
2008年第1期31-37,共7页
Journal of Vibration Engineering
基金
国家自然科学基金青年基金(50408035)
国家自然科学基金(50538050)联合资助
关键词
风洞试验
双曲薄壳冷却塔
气弹模型
等效梁格设计方法
wind tunnel test
hyperbolic thin-shell cooling tower
aero-elastic model
equivalent beam-net design method
