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针对某新翼型叶片,提出了翼型加厚、新型双夹板式叶片连接方式、叶片沿翼展方向开槽和加胁三种风轮固有频率改进新方法。利用PULSE16.1结构振动分析系统对相应系列新翼型叶片风轮进行模态测试,获得各结构改进方法对风轮各阶固有频率的影响规律。试验结果表明:加厚新翼型叶片可有效提升风轮前三阶固有频率18%以上;新型双夹板式叶片安装疗式较老式法兰紧固叶片安装方式也可有效提升风轮前三阶固有频率,且其对风轮各阶对称振型固有频率的提升效应较反对称振型显著;沿翼展方向开槽和加胁的新翼型同样可有效提升风轮的前三阶固有频率,且其对风轮各阶反对称振型固有频率的提升效应较对称振型显著。
Aiming at a new wing blade, a new method to improve the natural frequency of three kinds of wind wheels is proposed, which is airfoil thickened, new type of double cleat blade connection, blade flanging in the span direction and adding threat. Using the PULSE16.1 structural vibration analysis system, the corresponding series of new airfoil rotor blades were mode tested, and the influence of each structural improvement method on the natural frequencies of each rotor was obtained. The test results show that the thickening of the new airfoil blade can effectively increase the natural frequency of the first three stages of the wind turbine by more than 18%. The installation of the new double-cleat blade mounting type old-style flange fastening blade also can effectively enhance the first three stages Natural frequency, and its natural frequency of each mode of symmetry of the wind turbine to enhance the effect than the anti-symmetric vibration mode significantly; along the spanwise direction of the slotted and added threat of new airfoils can also effectively enhance the first three natural frequencies , And its lifting effect on the natural frequencies of the anti-symmetrical vibration modes at all levels of the wind turbine is more pronounced than that of the symmetrical vibration mode.