| In view of the rapid development of wind turbines in recent years in our country,the design and construction are still immature.There is no unified theoretical norms to guide them.The damage to wind turbines caused by wind-induced fatigue causes the towers to tilt,even more serious accidents such as collapse have also occurred,so the safety of fan units is worrying.Therefore,in this paper,the wind turbine 2MW gravity fan unit is taken as the research object,the wind turbine tower inclination is measured by using the multi-station method for troublesome fans and normal fans,and based on the error propagation law,mathematical model of fan tower tilt measurement method has been established,the error precision analysis has been carried out,and achieved the following results:(1)Proposed a method based non-prism total station that applied for wind turbine tower tilt measurement.An analysis model based on the law of error propagation was established,and the error precision analysis of multi-station method was carried out.The formula for calculating the error precision was obtained.The multi-station measurement method is more effective for the measurement of wind field in mountainous area.The results of ellipse error analysis in multi-station and single-station in this paper show that the error of single-station measurement method is obviously larger than that of double-station measurement.(2)The test results of multiple wind turbines in wind power filed show that the multi-station measurement can effectively measure the tilt between test sections,which is a good non-destructive testing method.The measurement results of 10 # wind turbine show that the measurement of wind turbine inclination has a certain effect on the prediction of bottom fatigue damage.The inclination is obviously greater than that caused by the fatigue damage of the fan base ring.The deformation of the fan tower is not only related to the initial inclination of the bottom base ring,but also related to the second-order gravity effect caused by the wind direction,the wind load and the eccentricity of topThe measurement error is within one centimeter,which can reach the ideal measurement accuracy.Good command of the wholemeasurement process,not only can improve the speed and accuracy of measurement,more important is do not need to climb to the top of the tower drum fan,also don't demand measuring the radius of the tower drum fan,can save a lot of manpower material resources.(3)The tilt amount of wind turbine tower application for the total station,within16 mm measurement error,which can achieve very good measurement accuracy.use the entire measurement process skillfully can not only improve the measurement speed and accuracy,but more importantly,don't need to climb to the top of the fan tower and measure the radius of the fan tower at the same time,that can save a lot of manpower and resources.(4)The model of straight and slant bar of wind turbine is established based on SAP2000.The analysis results show that due to the self-weight of structure,the moment caused by eccentricity is relatively smaller than the wind-induced bending moment.Therefore,moments increment produced by foundation inclination is compared with not inclined at the begining are less than 5 percent,in consideration of the safety reservation,fan base can be used according to the original reinforcement design.However,in view of the height of the fan tower is about 80 m,and the steel cylinder is partial to be softer,0.38% inclination is relatively large and is difficult to effectively ensure its normal operation.Therefore,for 10 # fan base,it is more prudent to reinforcement after the demolition,so as to avoid the second investment. |
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