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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
25、sed to demonstrate the adopted methods. Finally, the adopted methods are demonstrated in an engineering case study of a generic laminated composite wind turbine blade.Structural collapse of a wind turbine blade. Part B: Progressive interlaminar failure modelsComposites Part A: Applied Science and Ma
26、nufacturingThe objective of this paper is to present a geometrical nonlinear and interlaminar progressive failure finite element analysis of a generic wind turbine blade undergoing a static flap-wise load and comparisons with experimental findings. It is found that the predictive numerical models sh
27、ow excellent correlation with the experimental findings and observations in the pre-instability response. Consequently, the ultimate strength of the wind turbine blade studied is governed by a delamination and buckling coupled phenomenon, which results in a chain of events and sudden structural coll
28、apse with compressive fibre failure in the delaminated flange material. Finally, a parametric study of the critical load factors with respect to various delamination sizes and positions inside the compressive flange of the wind turbine blade is presented.An adaptive neuro-fuzzy inference system appr
29、oach for prediction of tip speed ratio in wind turbinesExpert Systems with ApplicationsThis paper introduces an adaptive neuro-fuzzy inference system (ANFIS) model to predict the tip speed ratio (TSR) and the power factor of a wind turbine. This model is based on the parameters for LS-1 and NACA4415
30、 profile types with 3 and 4 blades. In model development, profile type, blade number, Schmitz coefficient, end loss, profile type loss, and blade number loss were taken as input variables, while the TSR and power factor were taken as output variables. After a successful learning and training process
31、, the proposed model produced reasonable mean errors. The results indicate that the errors of ANFIS models in predicting TSR and power factor are less than those of the ANN method.Optimal blade shape of a modified Savonius turbine using an obstacle shielding the returning bladeEnergy Conversion and
32、ManagementDue to the worldwide energy crisis, research and development activities in the field of renewable energy have been considerably increased in many countries. Wind energy is becoming particularly important. Although considerable progress have already been achieved, the available technical de
33、sign is not yet adequate to develop reliable wind energy converters for conditions corresponding to low wind speeds and urban areas. The Savonius turbine appears to be particularly promising for such conditions, but suffers from a poor efficiency. The present study considers a considerably improved
34、design in order to increase the output power of a classical Savonius turbine. In previous works, the efficiency of the classical Savonius turbine has been increased by placing in an optimal manner an obstacle plate shielding the returning blade. The present study now aims at improving further the ou
35、tput power of the Savonius turbine as well as the static torque, which measures the self-starting capability of the turbine. In order to achieve both objectives, the geometry of the blade shape (skeleton line) is now optimized in presence of the obstacle plate. Six free parameters are considered in
36、this optimization process, realized by coupling an in-house optimization library (OPAL, relying in the present case on Evolutionary Algorithms) with an industrial flow simulation code (ANSYS-Fluent). The target function is the output power coefficient. Compared to a standard Savonius turbine, a rela
37、tive increase of the power output coefficient by almost 40% is finally obtained at =0.7. The performance increase exceeds 30% throughout the useful operating range. Finally, the static torque is investigated and found to be positive at any angle, high enough to obtain self-starting conditions.The in
38、ception of OMA in the development of modal testing technology for wind turbinesMechanical Systems and Signal ProcessingWind turbines are immense, flexible structures with aerodynamic forces acting on the rotating blades at harmonics of the turbine rotational frequency. These harmonics are comparable
39、 to the modal frequencies of the structure. Predicting and experimentally measuring the modal frequencies of wind turbines have been important to their successful design and operation. Performing modal tests on wind turbine structures over 100m tall is a substantial challenge, which has inspired inn
40、ovative developments in modal test technology. For wind turbines, a further complication is that the modal frequencies are dependent on the turbine rotation speed. The history and development of a new technique for acquiring the modal parameters using output-only response data, called the Natural Ex
41、citation Technique (NExT), will be reviewed, showing historical tests and techniques. The initial attempts at output-only modal testing began in the late 1980s with the development of NExT in the 1990s. NExT was a predecessor to Operational Modal Analysis (OMA), developed to overcome these challenge
42、s of testing immense structures excited with natural environmental inputs. We will trace the difficulties and successes of wind turbine modal testing from 1982 to the present.Optimization of Savonius turbines using an obstacle shielding the returning bladeDue to the worldwide energy crisis, research
43、 and development activities in the field of renewable energy have been considerably increased in many countries. In Germany, wind energy is becoming particularly important. Although considerable progress has already been achieved, the available technical design is not yet adequate to develop reliabl
44、e wind energy converters for conditions corresponding to low wind speeds and urban areas. The Savonius turbine appears to be particularly promising for such conditions, but suffers from a poor efficiency. The present study considers a considerably improved design in order to increase the output powe
45、r of a Savonius turbine with either two or three blades. In addition, the improved design leads to a better self-starting capability. To achieve these objectives, the position of an obstacle shielding the returning blade of the Savonius turbine and possibly leading to a better flow orientation towar
46、d the advancing blade is optimized. This automatic optimization is carried out by coupling an in-house optimization library (OPAL) with an industrial flow simulation code (ANSYS-Fluent). The optimization process takes into account the output power coefficient as target function, considers the positi
47、on and the angle of the shield as optimization parameters, and relies on Evolutionary Algorithms. A considerable improvement of the performance of Savonius turbines can be obtained in this manner, in particular a relative increase of the power output coefficient by more than 27%. It is furthermore d
48、emonstrated that the optimized configuration involving a two-blade rotor is better than the three-blade design.Acoustic measurement for 12% scaled model of NREL Phase VI wind turbine by using beamformingCurrent Applied PhysicsWind tunnel test for the 12% scaled model of NREL Phase VI wind turbine wa
49、s conducted at Korea Aerospace Research Institute (KARI) low speed wind tunnel. Test condition for the scaled model was decided to match the blade tip mach number with real scale model test which was conducted at NASA Ames (80120) Tunnel. Aerodynamic performance represented by torque of the blades was measured by using the torque sensor installed in rotating shaft and compared with real