ig风力发电机叶片:设计规范、材料、制作工艺、结构强度、雷电保护、认证规范 运输运行中的质检标准.doc
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1、Structural collapse of a wind turbine blade. Part A: Static test and equivalent single layered modelsComposites Part A: Applied Science and ManufacturingThe overall objective is a top-down approach to structural instability phenomena in wind turbine blades, which is used to identify the physics gove
2、rning the ultimate strength of a generic wind turbine blade under a flap-wise static test. The work is concerned with the actual testing and the adoption of a phenomenological approach, and a discussion is conducted to assess and evaluate the wind turbine blade response during loading and after coll
3、apse by correlating experimental findings with numerical model predictions. The ultimate strength of the blade studied is governed by instability phenomena in the form of delamination and buckling. Interaction between both instability phenomena occurs causing a progressive collapse of the blade stru
4、cture.Linear vibration analysis of rotating wind-turbine bladeCurrent Applied PhysicsIn the wind-turbine design, linear vibration analysis of the wind-turbine blade should be performed to get vibratory characteristics and to avoid structural resonance. EOM (equations of motion) for the blade are der
5、ived and vibratory characteristics of a rotating blade are observed and discussed in this work. Linear vibration analysis requires the linearized EOM with DOF (degree of freedom). For the system with large DOF, the derivation and linearization of EOM are very tedious and difficult. Constrained multi
6、-body technique is employed to derive EOMs to alleviate this burden. It is well known that natural frequencies and corresponding modes vary as rotating velocity changes. At the operating condition with relatively high rotating velocity, almost all commercial programs cannot predict the blade frequen
7、cies accurately. Numerical problems were solved to verify the accuracy of the proposed method. Through the numerical problems, this work shows that the proposed method is useful to predict the vibratory behavior of the rotating blade. Furthermore, a numerical problem was solved to check the numerica
8、l accuracy of commercial program results within operating region.Aero-elastic behavior of a flexible blade for wind turbine application: A 2D computational studyEnergyThis paper presents a computational study into the static aeroelastic response of a 2D wind turbine airfoil under varying wind condit
9、ions. An efficient and accurate code that couples the X-Foil software for computation of airfoil aerodynamics and the MATLAB PDE toolbox for computation of the airfoil deformation is developed for the aero-elastic computations. The code is validated qualitatively against computational results in lit
10、erature. The impact of a flexibility of the airfoil is studied for a range of design parameters including the free stream velocity, pitch angle, airfoil thickness, and airfoil camber. Static aero-elastic effects have the potential to improve lift and the lift over drag ratio at off-design wind speed
11、 conditions. Flexibility delays stall to a large pitch angle, increasing the operating range of a flexible blade airfoil. With increased thickness the airfoil deformation decrease only linearly.Technical cost modelling for a generic 45-m wind turbine blade producedby vacuum infusion (VI)Renewable En
12、ergyA detailed technical cost analysis has been conducted on a generic 45-m wind turbine blade manufactured using the vacuum infusion (VI) process, in order to isolate areas of significant cost savings. The analysis has focused on a high labour cost environment such as the UK and investigates the in
13、fluence of varying labour costs, programme life, component area, deposition time, cure time and reinforcement price with respect to production volume. A split of the cost centres showed the dominance of material and labour costs at approximately 51% and 41%, respectively. Due to the dominance of mat
14、erials, it was shown that fluctuations in reinforcement costs can easily increase or decrease the cost of a turbine blade by up to 14%. Similarly, improving material deposition time by 2h can save approximately 5% on the total blade cost. However, saving 4h on the cure cycle only has the potential t
15、o provide a 2% cost saving.A cost and performance comparison of LRTM and VI for the manufacture of large scale wind turbine bladesRenewable EnergyLight resin transfer moulding (LRTM) has been developed as an alternative to vacuum infusion (VI) but a direct comparison between the two processes is nee
16、ded to quantify any advantages. This paper uses a technical cost model and an empirical study to show the potential financial and performance benefits of LRTM for manufacture of a generic 40m wind turbine blade shell. The use of LRTM when compared to VI demonstrated a possible 3% cost saving, improv
17、ed dimensional stability (5.5%), and reductions in resin wastage (3%) and infusion time (25%). A decrease in internal void formation (0.9%) resulted in an increase in mechanical performance (4%) for LRTM moulded parts.Power curve control in micro wind turbine designIn this work, a micro wind turbine
18、 will be designed and built for a series of wind tunnel tests (rotor dynamics and Wind Turbine (WT) start-up velocity). Its design stems from an original numerical code, developed by the authors, based on the Blade Element Momentum (BEM) Theory. From classic design criteria, having evaluated all the
19、 geometric characteristics, an innovative methodology will be shown for controlling the power curve of the wind turbine. Indications will be supplied in order to modify various sections of the power curve and so as to design the turbine according to its practical application.微小型风力发电机组的输出电能能源曲线控制Perf
20、ormance effects of attachment on blade on a straight-bladed vertical axis wind turbine直线型垂直轴风力发电机叶片工作效能及其附件选配Current Applied PhysicsRecently, many straight-bladed vertical axis wind turbines (SB-VAWT) are installed in community, urban and high mountain areas as an independent power supply. However,
21、in cold climates, icing, snow and other attachments on the blade surface may affect turbine performance. In this study, the condition of rime-type icing on the leading edge of blade surface was simulated by clay, and the effects on the rotation and power performance were measured by wind tunnel test
22、s and discussed. The results show that the attachment reduced the steady revolution and power coefficient of the SB-VAWT, and the reduction rate increased as the weight of the attachment and wind speed increased.A methodology for the structural analysis of composite wind turbine blades under geometr
23、ic and material induced instabilitiesComputers & StructuresThe objective of this work is to develop a modeling strategy for the structural analysis of large three-dimensional laminated composite structures undergoing geometric and material induced instability. A sub-modeling approach is used with mu
24、ltiple mixed-mode linear-softening cohesive elements and linear-elastic solid-shell elements through the thickness. A localized sub-plane control strategy is adopted for tracking multiple crack formations and the propagation of multiple delamination fronts. Simple element and solver benchmarks are u
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