A method of determining test load for full-scale wind turbine blade fatigue tests

Ma, Qiang; An, Zongwen; Gao, Jianxiong; Kou, Haixia; Bai, Xuezong

doi:10.1007/s12206-018-1006-y

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…In fact, there are significant differences in the fatigue damage mechanisms of composites at different stress ratios, and the

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plane is usually divided into compression‐compression (C‐C), compression‐tension (C‐T) and tension‐tension (T‐T) loading zones according to the value of the stress ratio 13,21 . However, a large number of comparative results of CLD models and fatigue test data indicate that the

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plane should be divided into four zones that is, C‐C, C‐T, tension‐compression (T‐C) and tension‐tension (T‐T) loading zones, 31,32 as shown in Figure 5. Each load zone should be determined separately in the p ‐CLD modeling and the equal probability quantile points within each load zone should be co‐linear.…”

Section: P‐cld Modeling Methodologymentioning

confidence: 99%

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A probabilistic constant amplitude life diagram modeling method for composite materials considering spatial mapping relation

Shilong,

Qiang,

Huidong

et al. 2023

Quality & Reliability Eng

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Conventional constant amplitude life diagrams (CLDs) model cannot reasonably describe mean stress effect and stochastic uncertainty present in the fatigue failure process of composite materials. To address this problem, taking the spatial mapping relationship between probabilistic S‐N curves and probabilistic CLD model as an entry point, a probabilistic CLD modeling method is proposed under the assumption of linear equations and the assumption of equiprobable quantile point between static strength distributions and fatigue life distributions. The p‐S‐N curve is established using fatigue test data from different load zones divided by different stress ratios. Subsequently, the p‐CLD model is derived through the spatial mapping relationship of the p‐S‐N curve. The method is validated by fatigue test data of glass fiber/polyester resin composites. The results indicate that the proposed method can offer an accurate description of the probabilistic behavior of composite materials.

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“…In fact, there are significant differences in the fatigue damage mechanisms of composites at different stress ratios, and the

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{S}_{\rm{a}} - {S}_{\rm{m}}

Section: P‐cld Modeling Methodologymentioning

confidence: 99%

“…I G U R E 2 S-N Curve and CLD model for engineering structures 32. CLD, constant amplitude life diagram.…”

mentioning

confidence: 99%

A probabilistic constant amplitude life diagram modeling method for composite materials considering spatial mapping relation

Shilong,

Qiang,

Huidong

et al. 2023

Quality & Reliability Eng

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“…The fatigue load spectrum of the blade is introduced, and the fatigue cumulative damage of the section where each node of the blade finite element model is calculated by using the fatigue test target load calculation method proposed in Reference [8], and the target load with the stress ratio 1 r = − in the flap and edgewise of the section is generated respectively. Since the stress ratio Step 3.…”

Section: Test Load Distribution Optimization Methods Based On Particl...mentioning

confidence: 99%

Load Distribution Optimization Method for Fatigue Test of Full-scale Structure of Biaxial Resonant Wind Turbine Blade

Zhang¹,

Ma²

2022

JEMM

Self Cite

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Wind turbine blade is the key component of wind turbine to realize wind energy capture, so it is necessary to verify the rationality of blade structure design through full-scale structural fatigue test. In order to improve the test accuracy and efficiency, this paper proposes to establish the dynamic analysis model of the multi-degree of freedom system of the tested blade by using the finite beam element to realize the calculation method of the load amplitude of the biaxial fatigue test and integrate the dynamic analysis model and the target load calculation method into the particle swarm optimization algorithm to realize the optimization of the load distribution of the biaxial resonant full-size structure fatigue test. Through the design of a biaxial resonant loading scheme of 2.5MW-52.5m wind turbine blades, the results show that this method can quickly and accurately adjust the optimization parameters such as the position of the exciter and the motion quality of the exciter in the flapwise and edgewise on the premise that the fatigue cumulative damage caused by the test load is not less than the cumulative damage of the target load.

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“…Second, simultaneously carry out the flap-wise and edgewise direction loading test, shorten the test cycle time [4][5]. According to the test loading form, the fatigue test of full-scale structures is mainly divided into forced displacement type and resonance excitation type [6]. Compared to the forced displacement type, the resonant excitation type fatigue test system can obtain a large blade amplitude with a small excitation force, and has the advantages of low cost, short test cycle and suitable for large wind turbine blades [7].…”

Section: Introductionmentioning

confidence: 99%

Wind turbine blades load matching method under biaxial fatigue test

2023

jemm

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In order to improve the fatigue test accuracy and efficiency of full-scale structure of wind turbine blades, an effective load matching method for full-scale structure fatigue test of wind turbine blades under biaxial loading is proposed. The blade biaxial loading fatigue test scheme is designed. The transfer matrix method is used to calculate the test bending moment under biaxial loading. The particle swarm optimization algorithm is designed to optimize the position and mass of the excitation device in the flap-wise and edgewise directions and the position, mass and quantity of the fixed counterweight. Based on this, the calculation model of the test bending moment and the data of the target bending moment are integrated into the particle swarm optimization algorithm to achieve the optimal matching of the biaxial loading fatigue test load, Finally, a numerical example is given to verify it. The results show that this method can make the test load closer to the target load, further accelerate the popularization of biaxial loading fatigue test, and provide a certain theoretical reference and application value for engineering practice.

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A method of determining test load for full-scale wind turbine blade fatigue tests

Cited by 10 publications

References 7 publications

A probabilistic constant amplitude life diagram modeling method for composite materials considering spatial mapping relation

A probabilistic constant amplitude life diagram modeling method for composite materials considering spatial mapping relation

Load Distribution Optimization Method for Fatigue Test of Full-scale Structure of Biaxial Resonant Wind Turbine Blade

Wind turbine blades load matching method under biaxial fatigue test

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