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Journal articles on the topic 'Blade-root'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Sal, Firat. "Analysis of combined passively and actively morphing blade root chord length and blade taper for helicopter control." Aircraft Engineering and Aerospace Technology 92, no. 2 (2019): 172–79. http://dx.doi.org/10.1108/aeat-04-2019-0077.

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Purpose The purpose of this study is to examine the effect of passive and active morphing of blade root chord length and blade taper on the control effort of the flight control system (FCS) of a helicopter. Design/methodology/approach Physics-based helicopter models, which are functions of passive and active morphing, are created and applied in helicopter FCS design to determine the control effort. Findings Helicopters, having both passively and actively morphing blade root chord length and blade taper, experience less control effort than the ones having either only passively morphing blade ro

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2

Sal, Firat. "Effects of the actively morphing root chord and taper on helicopter energy." Aircraft Engineering and Aerospace Technology 92, no. 2 (2019): 264–70. http://dx.doi.org/10.1108/aeat-08-2019-0165.

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Purpose The purpose of this paper presents the effects of actively morphing root chord and taper on the energy of the flight control system (i.e. FCS). Design/methodology/approach Via regarding previously mentioned purposes, sophisticated and realistic helicopter models are benefitted to examine the energy of the FCS. Findings Helicopters having actively morphing blade root chord length and blade taper consume less control energy than the ones having one of or any of passively morphing blade root chord length and blade taper. Practical implications Actively morphing blade root chord length and

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3

Amer, Kenneth B. "Technical Notes: Comment on the “Minimum Weight Design of Helicopter Rotor Blades with Frequency Constraints,” Journal of the American Helicopter Society, October, 1989." Journal of the American Helicopter Society 35, no. 2 (1990): 69. http://dx.doi.org/10.4050/jahs.35.2.69.

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It appears that most of the weight saving from the reference blade to the minimum‐weight blade is in the region of the blade root. Undoubtedly, the reference blade requires this weight increase to accommodate the usual bending fatigue loads at the root. The authors do not address the question of how their minimum‐weight blade would handle blade‐root fatigue loads.

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4

Sun, Yuanrong, Yihang Qu, Congli Hu, Peiyu Qi, Huawei Liu, and Jianbo Li. "Effects of Fibre-Reinforced Plastic Wedge-Stick Slope on the Performance of Wind-Turbine Blade Root Connections." Coatings 14, no. 1 (2024): 129. http://dx.doi.org/10.3390/coatings14010129.

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Bushing-insert connections have emerged as efficient blade root connection designs. Bushing-insert connections with fibre-reinforced plastic (FRP) wedge-sticks enhance the strength and stability of the blade root, prevent stress concentration at the blade root, and improve the service life and reliability of the blade. However, studies on the failure mechanisms of the FRP wedge-sticks in bushing-insert connections are scarce. Hence, in this study, the influence of the FRP wedge-stick on the structural performance of the blade root was analysed by changing the slope of the FRP wedge-stick’s inc

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5

Zhou, Peng Zhan, and Fang Sheng Tan. "Stress Characteristics Analysis on a Composite Wind Turbine Blade." Advanced Materials Research 602-604 (December 2012): 111–14. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.111.

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The stress characteristics on a composite wind turbine blade are analyzed by using a finite element method. The whole stress level of the spar cap and the blade root is higher than that of the shear web and the airfoil plate, so the spar cap and the blade root are the main force-supporting parts. If the stress concentration point on the interface corner between the blade root and the shear web is neglected, the stress of the spar cap is higher than that of the blade root, and its maximum stress and mean stress are 211 MPa and 180 MPa respectively. The maximum stress of the blade is only 34.8%

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6

Hee, Lim Meng, M. Salman Leong, and K. H. Hui. "Blade Faults Classification and Detection Methods: Review." Advanced Materials Research 845 (December 2013): 123–27. http://dx.doi.org/10.4028/www.scientific.net/amr.845.123.

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Blade faults are ranked among the most frequent causes for gas turbine failures. This paper provides a review on the types of blade faults as well as its pertinent detection methods. In this paper, blade faults are categorized into five major groups according to their nature and characteristics namely, blade rubbing, blade fatigue failures, blade deformation, blade fouling, and blade root related problems such as cracked root and loose blade. This paper aims to provide an overview on the characteristics of each type of blade fault as well as its best detection methods available to date.

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7

Wiryolukito, Slameto. "Design Flaw Enhanced by Improper Workmanship to Cause Fatigue Failure on Rotor Blade of Compressor Gas Turbine." Applied Mechanics and Materials 660 (October 2014): 593–97. http://dx.doi.org/10.4028/www.scientific.net/amm.660.593.

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Ten stages of Compressor Engine S/N 123 of X-Gas Turbine failed in service prior the schedule for overhaul at 40,000 hour. At the failure event the running hour was 29,600. The maintenance was normally done every 8000 hours including filter and gasket replacement, instrument re-calibration, and bore scope examination. Upon dismantling, it was found one blade at rotor stage #3 failed with facture surface strongly indicated a fatigue failure, defective on stator and rotor blades at downstream, no defective blades at upstream. Detail examination confirm Root Cause of failure on Compressor Blade o

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Martynenko, Volodymyr. "Comparative analysis of the dynamic characteristics of all-metal, composite and composite blades with the same profile, taking into account the influence of the connection of elements and aerodynamic loads." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, no. 2 (December 21, 2023): 16–27. http://dx.doi.org/10.20998/2078-9130.2023.2.292982.

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The paper presents a comparative analysis of the dynamic properties of the blades of one rotary machine which have the same airfoil shape, but are made of three different materials, namely aluminum alloy, a complex material combining aluminum alloy and steel, and a composite material which is unidirectional fiberglass. In the case of an all-metal blade, its airfoil and root are made of aluminum alloy. In the case of complex blade airfoil material, the root is made of steel which is also a component of the airfoil material. In the case of a composite blade, the root is steel and is connected at

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9

Dong, Zheng Yan, and Han Long Zhang. "Study on Finite Element Model of Bolt Strength in Blade Root." Applied Mechanics and Materials 427-429 (September 2013): 221–24. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.221.

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This study has established a 1/184 model of blade root by using finite element software (ANSYS), and analyzed the stress pipeline and errors of this blade root model. By transforming the loads in blade root and imposing axial step load, especially by analyzing models boundary conditions and the structure of contact surface, the axial stress, bending stress and the other parameters have been acquired.

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10

Oktay, Tugrul, and Firat Sal. "Effect of the Simultaneous Variation in Blade Root Chord Length and Blade Taper on Helicopter Flight Control Effort." International Journal of Aerospace Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6325269.

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In this study, the effect of simultaneous variation in blade root chord length and blade taper on the control effort of helicopter flight control system (i.e., FCS) of a helicopter is investigated. Therefore, helicopter models (i.e., complex, control-oriented, and physics-based models) including the main physics and essential dynamics are used. The effect of simultaneous variation in the blade root chord length and blade taper (i.e., in both chordwise and lengthwise directions dependently) on the control effort of an FCS of a helicopter and also on the closed-loop responses is studied. Compari

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11

Purnomo, Anggit Aji, Sunaryo Sunaryo, and Ahmad Kafrawi Nasution. "Failure Analysis of High-Pressure Turbine Blades in Steam Power Plants." Journal of Applied Materials and Technology 4, no. 1 (2023): 24–33. http://dx.doi.org/10.31258/jamt.4.1.24-33.

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This paper describes the failure of high-pressure steam turbine blades. During the Serious Inspection, it was discovered that the ninth-stage high-pressure turbine blade had failed. The causes of blade failure are examined via visual inspection and destructive testing. The failure mechanism of the blades was determined by conducting mechanical properties testing, metallographic inspection, and energy spectrum analysis. The mechanical properties of the leaf and root blade specimens were within the range of blade steel for steam turbines according to the Chinese National Standard (GB/T 8732-2004

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Zhang, Yi, Ming Hui Zhang, and Yong Hui Xie. "Turbine Blade Straddle Root and Rim Structural Optimization Using Finite Element Contact Analysis." Advanced Materials Research 753-755 (August 2013): 1453–56. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.1453.

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The development of turbine blade root style is one of the key problems in the blade design technology as the root carries most of the loads of the whole blade. The optimal design problem and the corresponding numerical method were established for a straddle root structure with the minimum equivalent stress of the root and rim as the optimal objective. A multi-variable parametric model of the blade and rim, which took eight critical geometrical variables of the root and rim as design variables, was built by APDL (ANSYS parametric design language) and the optimal problem was numerically solved b

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13

Li, Zhen, Bofeng Xu, Xiang Shen, Hang Xiao, Zhiqiang Hu, and Xin Cai. "Performance Analysis of Ultra-Scale Downwind Wind Turbine Based on Rotor Cone Angle Control." Energies 15, no. 18 (2022): 6830. http://dx.doi.org/10.3390/en15186830.

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The theoretical feasibility of the power output strategy based on rotor cone angle control for ultra-scale downwind wind turbines is studied in this paper via the Open FAST simulation platform. The performance of five cases, namely UW, DW, DWC, DW6, and DW6IC, which have different rotor parameters or control strategies compared with the reference DTU 10 MW wind turbine, are calculated and analyzed. It is found that the downwind rotors have significant advantages in reducing the blade root load. The DW case reduces the peak load at the blade root by 22.54% at the cost of 1.57% annual energy pro

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14

Nurfauzi, Egi, Lilies Esthi Riyanti, and Bhima Shakti Arrafat. "Damage Analysis of Propeller Blade P/N R815505 with Root Cause Failure Analysis Method on ATR 72 Aircraft." Airman: Jurnal Teknik dan Keselamatan Transportasi 5, no. 2 (2022): 87–94. http://dx.doi.org/10.46509/ajtk.v5i2.297.

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The propeller blade is a component that is the main source of thrust on the ATR 72 aircraft. Based on data from the Aircraft Flight Maintenance Log (AFML) for the period 2019 – 2021 ATR 72 aircraft, the propeller blade component was damaged causing the need for unscheduled removal which had impact losses to airlines such as delays and aircraft-on-ground (AOG). This study aims to find the root causes of damage to the propeller blade components. Analysis was carried out using the Root-Cause Failure Analysis (RCFA) method using fault tree analysis (FTA) and fishbone diagrams as tools so that fact

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15

Weihing, Pascal, Tim Wegmann, Thorsten Lutz, Ewald Krämer, Timo Kühn, and Andree Altmikus. "Numerical analyses and optimizations on the flow in the nacelle region of a wind turbine." Wind Energy Science 3, no. 2 (2018): 503–31. http://dx.doi.org/10.5194/wes-3-503-2018.

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Abstract. The present study investigates flow dynamics in the hub region of a wind turbine focusing on the influence of nacelle geometry on the root aerodynamics by means of Reynolds averaged Navier–Stokes simulations with the code FLOWer. The turbine considered is a generic version of the Enercon E44 converter incorporating blades with flat-back-profiled root sections. First, a comparison is drawn between an isolated rotor assumption and a setup including the baseline nacelle geometry in order to elaborate the basic flow features of the blade root. It was found that the nacelle reduces the tr

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16

Verma, Amrit Shankar, Zhiyu Jiang, Zhengru Ren, Zhen Gao, and Nils Petter Vedvik. "Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines." Energies 12, no. 10 (2019): 1867. http://dx.doi.org/10.3390/en12101867.

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Installation of wind-turbine blades on monopile-type offshore wind turbines is a demanding task. Typically, a jack-up crane vessel is used, and blades are individually lifted from the vessel deck and docked with the preinstalled hub. During the process of mating, large relative motions are developed between the hub and root due to combined effects of wind-generated blade-root responses and wave-generated monopile vibrations. This can cause impact loads at the blade root and induce severe damages at the blade-root connection. Such events are highly likely to cause the failure of the mating task

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17

Zhang, Ming Hui, Di Zhang, and Yong Hui Xie. "Design Optimization for Double-T Root and Rim of Turbine Blade with Three-Dimensional Finite Element Method." Applied Mechanics and Materials 215-216 (November 2012): 239–43. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.239.

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As the main bearing part in a turbine blade, the root carries most of the loads of the whole blade. The improvement of the root structure can be used to enhance the operation reliability of steam turbine. The research on design optimization for double-T root and rim of a turbine blade was conducted by three-dimensional finite element method. Based on the APDL (ANSYS parametric design language), a multi-variable parametric model of the double-T root and rim was established. Twelve characteristic geometrical variables of the root-rim were optimized to minimize the maximum equivalent stress. The

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18

Damanik, Natalina, and Hendery Dahlan. "Failure Investigation and Crack Propagation Analysis of LP Blade Steam Turbine 220 MW." Key Engineering Materials 876 (February 2021): 67–76. http://dx.doi.org/10.4028/www.scientific.net/kem.876.67.

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The cracked blade in L-0, L-1 governor side, and L-1 generator side were found when A 220 MW low-pressure steam turbine was checked in the serious inspection. However, the crack population more dominant at L-1 Gen compared to L-0 Gov and L-1 Gov. Most of the cracks were located on 300-400 mm from the root of the blade span, and it did not associate with the pitting defect. In this study, the root cause of L-1 blade failure was investigated. There is three-stage of analyzing process, firstly capturing the airfoil and dimension of L-1—secondly, the material properties analysis, and finally stres

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19

., Sutrisno, Prajitno ., Purnomo ., and B. W. Setyawan. "The Performance & Flow Visualization Studies of Three dimensional (3-D) Wind Turbine Blade Models." Modern Applied Science 10, no. 5 (2016): 132. http://dx.doi.org/10.5539/mas.v10n5p132.

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<p>The researches on the design of 3-D wind turbine blades have been received less attention so far even though 3-D blade products are widely sold. In the opposite, advanced researches in 3-D helicopter blade have been studied rigorously. Researches in wind turbine blade modeling are mostly assumed that blade span wise sections behaves as independent two dimensional (2-D) airfoils, implying that there is no exchange of momentum in the span wise direction. Further more flow visualization experiments are infrequently conducted.</p><p>The purpose of this study is to investigate

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20

Momin, M. Abdul, Paul A. Wempe, Tony E. Grift, and Alan C. Hansen. "Effects of Four Base Cutter Blade Designs on Sugarcane Stem Cut Quality." Transactions of the ASABE 60, no. 5 (2017): 1551–60. http://dx.doi.org/10.13031/trans.12345.

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Abstract. The cut quality of sugarcane stems during harvesting is of considerable importance, as any damage inflicted on the stems and root systems affects ratooning and reduces yield. In current conventional cutting systems for sugarcane, relatively little attention has been paid to optimizing the cutting dynamics by investigating various blade designs and configurations. One limitation of impact cutting methods is the relatively rapid blunting of the blade edges through wear, leading to stem damage. This study aimed at investigating the effects on sugarcane cut quality of four base cutter bl

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21

Gai, Feng, An Min Cai, Da Tong Zhang, and Li Xiang Sun. "Analysis on Influence of Effective Turbulence Intensity on Blade Root Fatigue Load of WTGS." Advanced Materials Research 538-541 (June 2012): 605–9. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.605.

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Based on the Palmgren-Miner linear cumulative fatigue damage theory, the blade root fatigue loads in different effective turbulence intensities were calculated and analysed. The results show that when the air density and the wind speed are constant, the blade root fatigue loads increase linearly with the effective turbulence intensity increasing, and the slopes increase linearly with the wind speed increasing. According to these results, the main source of the blade root fatigue loads under different wind conditions can be estimated to provide a theoretical basis for WTGS type selection in the

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22

Silori, Praveen, Nithin Kumar KC, Tushar Tandon, and Avichal Pandey. "Structural Analysis of Turbine Blade Disc Fir-Tree Root Using ANSYS." International Journal of Scientific Engineering and Research 3, no. 5 (2015): 52–55. https://doi.org/10.70729/ijser15159.

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23

Rahimi, Javad, Esmaeil Poursaeidi, and Ehsan Khavasi. "Stress analysis of a second stage gas turbine blade under asymmetric thermal gradient." Mechanics & Industry 20, no. 6 (2019): 607. http://dx.doi.org/10.1051/meca/2019041.

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In this study the main causes of the failure of a GE-F9 second stage turbine blade were investigated. The stress distribution of the blade which has 6 cooling vents in three modes (with full cooling, closure of half of the cooling channels, and without cooling) was studied. A three dimensional model of the blade was built and the fluid flow on the blade was studied using the FVM method. The stress distribution due to centrifugal forces applied to the blade, temperature gradients and aerodynamic forces on the blade surface was calculated by the finite element model. The results show that the hi

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Verma, Amrit Shankar, Zhiyu Jiang, Zhengru Ren, Zhen Gao, and Nils Petter Vedvik. "Effects of Wind-Wave Misalignment on a Wind Turbine Blade Mating Process: Impact Velocities, Blade Root Damages and Structural SafetyAssessment." Journal of Marine Science and Application 19, no. 2 (2020): 218–33. http://dx.doi.org/10.1007/s11804-020-00141-7.

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Abstract Most wind turbine blades are assembled piece-by-piece onto the hub of a monopile-type offshore wind turbine using jack-up crane vessels. Despite the stable foundation of the lifting cranes, the mating process exhibits substantial relative responses amidst blade root and hub. These relative motions are combined effects of wave-induced monopile motions and wind-induced blade root motions, which can cause impact loads at the blade root’s guide pin in the course of alignment procedure. Environmental parameters including the wind-wave misalignments play an important role for the safety of

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Li, Yanjun, Yunhao Zheng, Fan Meng, and Majeed Koranteng Osman. "The Effect of Root Clearance on Mechanical Energy Dissipation for Axial Flow Pump Device Based on Entropy Production." Processes 8, no. 11 (2020): 1506. http://dx.doi.org/10.3390/pr8111506.

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The axial flow pump is a low head, high discharge pump usually applicable in drainage and irrigation facilities. A certain gap should be reserved between the impeller blade root and the impeller hub to ensure the blade adjustability to broaden the high-efficiency area. The pressure difference between its blade surface induces leakage flow in the root clearance region, which decreases hydraulic performance and operational stability. Therefore, this study was carried out to investigate the effect of root clearance on mechanical energy dissipation using numerical simulation and entropy production

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Sepehri Amin, H., Ahmad Kermanpur, Saeed Ziaei-Rad, Hassan Farhangi, and M. Mosaddeghfar. "An Investigation on Failure Analysis of Titanium Gas Turbine Compressor Blades." Materials Science Forum 561-565 (October 2007): 2241–44. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.2241.

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Several premature failures were occurred in the high-pressure section of an industrial gas turbine compressor due to the fracture of Titanium blade roots. In this work, the failure process of the compressor blades was investigated based on the experimental characterisation. Macro/microfractographic studies were carried out on the fracture surfaces. Optical and scanning electron microscopy of the blade airfoil and root were performed. Mechanical properties of the blade alloy were also evaluated and compared with the standard specifications. The experimental results showed no metallurgical and m

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Dong, Guodan, Jianhua Qin, Zhaobin Li, and Xiaolei Yang. "An Inverse Method for Wind Turbine Blade Design with Given Distributions of Load Coefficients." Wind 2, no. 1 (2022): 175–91. http://dx.doi.org/10.3390/wind2010010.

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It is shown in the literature that wind turbine designs with different load distributions have different wake features. To systematically study how different load distributions affect turbine wakes, a method for designing variants of blades with different radial load distributions, but with approximately the same power (CP) or thrust coefficient (CT), is needed. In this work, an inverse design method based on the blade element momentum method and the multi-dimensional Newton’s method, with the normal and tangential force coefficients as the design objective and iterations for satisfying the CP

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Yang, Ke, Zhaoyang Yu, Weiwen Luo, et al. "Experiment and Study of Garlic Root Cutting Based on Continuous Force Feedback." Agronomy 13, no. 3 (2023): 835. http://dx.doi.org/10.3390/agronomy13030835.

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In this study, we quantified and analyzed the root-cutting process of garlic with a test bench with pressure sensors on the basis of the comparative analysis of various information perception methods. On the basis of the output value of the pressure sensor, the force curve of garlic roots was plotted, and the double round blade cutting module is optimized on the basis of the force curve diagram. The innovative proposal of slotted round blades for garlic root cutting is presented here. The round blade diameter is 110 mm, the center distance is 100 mm, the blade thickness is 1 mm, and the blade

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29

Hu, Hao, Xin-kai Li, and Bo Gu. "Flow Characteristics Study of Wind Turbine Blade with Vortex Generators." International Journal of Aerospace Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/6531694.

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The blade root flow control is of particular importance to the aerodynamic characteristic of large wind turbines. The paper studies the feasibility of improving blade pneumatic power by applying vortex generators (VGs) to large variable propeller shaft horizontal axis wind turbines, with 2 MW variable propeller shaft horizontal axis wind turbine blades as research object. In the paper, three cases of VGs installation are designed; they are scattered in different chordwise position at the blade root, and then they are calculated, respectively, with CFD method. The results show that VGs installe

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Chai, Bao Tong, Zheng Feng Wu, and Dong Xing Zhang. "Static Frequency Test and Leaf Fracture Analysis of Turbine Blades in a Power Plant." Applied Mechanics and Materials 893 (July 2019): 45–51. http://dx.doi.org/10.4028/www.scientific.net/amm.893.45.

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During the overhaul of a steam turbine of a power station, the frequency of the last twostages of the low-pressure rotor is tested and high-pressure rotor-regulated stage broken blades weresubjected to macroscopic inspection and analysis, chemical composition analysis, hardness test andmetallographic microstructure observation and analysis.The results of blade frequency measurementshow that the two stages of the low-pressure rotor can be safely and stably operated at the workingspeed. The results of broken blade analysis show that: due to the surface damage in the innersurface of the blade roo

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Пелих, В. П., М. Ю. Кибальний, and С. О. Дегтяренко. "Transport helicopter blade root cuff attachment modernization concepts." Наука і техніка Повітряних Сил Збройних Сил України, no. 2(55) (September 2, 2024): 23–31. http://dx.doi.org/10.30748/nitps.2024.55.03.

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The article discusses the issue of modernizing the blade root cuff attachment of the main rotor blade of a Mi-8 type transport helicopter. Several geometry options were designed and the stress-strain state of various options in a nonlinear formulation under the influence of operational loads was calculated using numerical methods. Conclusions are provided regarding the strength and mass of the blade root cuff attachment options under consideration. The influence of the tightening value of fasteners and the use of adhesive on the stress distribution along the connection is analyzed. Analytical

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Lin, Yuansheng, Yuqi Wang, and Yonghui Xie. "Steady-state stress analysis in a supercritical CO2 radial-inflow impeller using fluid solid interaction." Thermal Science 21, suppl. 1 (2017): 251–58. http://dx.doi.org/10.2298/tsci17s1251l.

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According to the geometry and the state parameters, a single channel model of a supercritical CO2 radial-inflow turbine is established. The finite volume method, the finite element method, and the shear stress transport turbulence model are used for solid-fluid interaction. In 3-D finite element analysis, the results of flow analysis and thermal analysis are adopted to obtain the stress distribution of the impeller in working condition. The results show that the maximum equivalent stress of the impeller is 550 MPa, which is located at the blade root of trailing edge and lower than the yield li

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Gao, Jun, and Liming Xie. "Analysis of the reasons for the fracture of the heat-engine plant turbine vane of the power plant feedwater pump." Journal of Physics: Conference Series 2808, no. 1 (2024): 012021. http://dx.doi.org/10.1088/1742-6596/2808/1/012021.

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Abstract The turbine of a 350MW thermal power unit’s feedwater pump in the Mengxi region experienced blade fracture and failure during operation. To identify the cause of blade fracture, comprehensive testing and analysis were conducted on the fractured blade using experimental methods such as macroscopic analysis, chemical make-up analysis, mechanical property testing, microstructure testing, and SEM micro area analysis of the fracture surface. The results indicate that the inner shoulder of the first tooth of the blade root is at a 90° right angle and belongs to the weak part of stress conce

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Major, D., M. Churchfield, and S. Schmitz. "Fatigue study of an inverse-designed low induction rotor using open-source tools." Journal of Physics: Conference Series 2265, no. 4 (2022): 042034. http://dx.doi.org/10.1088/1742-6596/2265/4/042034.

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Abstract The current trend in wind turbine design leans toward increasing rotor diameter for increased energy capture. This presents a notable fatigue concern as blade loads increase with blade length. One solution to potentially alleviate the additional blade loading and improve the fatigue behavior of large-diameter wind turbines, while also reducing overall cost of energy, is the low-induction rotor. The purpose of this work is to perform a holistic analysis to assess the attainable benefits of a notional low-induction rotor variant of the DTU 10MW Reference Wind Turbine using multi-discipl

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Wang, Jiao, Yue-hao Zhang, Tao Yu, and Qing-kai Han. "Dynamic Characteristics of Blade with Viscoelastic Damping Block Based on Complex Eigenvalue Method." Shock and Vibration 2018 (2018): 1–16. http://dx.doi.org/10.1155/2018/5068901.

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A novel method for vibration suppression is proposed, adding a viscoelastic damping block to the root of the blade. The dynamical equation for a rotational viscoelastic damping block-blade (VE-blade) in a centrifugal force field and aerodynamic force field is established to calculate the dynamical natural frequency and responses of the VE-blade. Complex modulus model is applied to represent the constitutive law of viscoelastic material and shear force acting on the VE-blade formulates the effect of viscoelastic damping at the root interfaces. The dynamical equation of the system is established

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Malovrh, Brendon, and Farhan Gandhi. "Localized Individual Blade Root Pitch Control for Helicopter Blade—Vortex Interaction Noise Reduction." Journal of the American Helicopter Society 55, no. 3 (2010): 32007–3200712. http://dx.doi.org/10.4050/jahs.55.032007.

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Kusyumov, Sergey, Robert Stepanov, Alexander Kusyumov, Ruslan Mirgazov, and Boris Kritsky. "Modelling of Flow Characteristics of Main Rotor with Elliptical Root Section in Hover Mode." E3S Web of Conferences 446 (2023): 06002. http://dx.doi.org/10.1051/e3sconf/202344606002.

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The modelling of a helicopter main rotor flow field in hover regime is being considered. The aerodynamic and aeroacoustics characteristics of two rotor models with different blade root geometries are compared. The first rotor has the shape of NACA0012 air foil in the root section of the blades. The second rotor model has an elliptic air foil in the root of the rotor blade. The amplitude and temporal characteristics of the aeroacoustics emission in near-field are investigated using Computational Fluid Dynamics (CFD).

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Dalli, Uğbreve;ur, and Şcedilefaatdin Yüksel. "Identification of Flap Motion Parameters for Vibration Reduction in Helicopter Rotors with Multiple Active Trailing Edge Flaps." Shock and Vibration 18, no. 5 (2011): 727–45. http://dx.doi.org/10.1155/2011/675791.

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An active control method utilizing the multiple trailing edge flap configuration for rotorcraft vibration suppression and blade loads control is presented. A comprehensive model for rotor blade with active trailing edge flaps is used to calculate the vibration characteristics, natural frequencies and mode shapes of any complex composite helicopter rotor blade. A computer program is developed to calculate the system response, rotor blade root forces and moments under aerodynamic forcing conditions. Rotor blade system response is calculated using the proposed solution method and the developed pr

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Langat, Kiprotich Patrick, Mariia Volkova, and Robert Folkenberg Siro. "STRENGTH ANALYSIS OF STEAM TURBINE BLADES FOR A NUCLEAR POWER PLANT." International Journal for Computational Civil and Structural Engineering 21, no. 1 (2025): 188–201. https://doi.org/10.22337/2587-9618-2025-21-1-188-201.

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The blade is an aerofoil-shaped component of a steam turbine that has a root attached to the rotor. The root is the base of the blade that supports the entire structure and transmits the torque generated by the steam flow to the rotor. The root must be designed in a manner that takes into account its removal during maintenance and positional maintenance on-the-fly during turbine operation. This essentially ensures a safe working environment for the operators and other personnel in the nuclear power plant. Strength analysis of a steam turbine blade is a prerequisite procedure in the steam turbi

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Sheard, A. G. "The Effects of Inlet Box Aerodynamics on the Mechanical Performance of a Variable Pitch in Motion Fan." Advances in Acoustics and Vibration 2012 (December 25, 2012): 1–10. http://dx.doi.org/10.1155/2012/278082.

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This paper describes research involving an in-service failure of a “variable pitch in motion” fan’s blade bearing. Variable pitch in motion fans rotate at a constant speed, with the changing blade angle varying the load. A pitch-change mechanism facilitates the change in blade angle. A blade bearing supports each blade enabling it to rotate. The author observed that as the fan aerodynamic stage loading progressively increased, so did the rate of blade-bearing wear. The reported research addressed two separate, but linked, needs. First, the ongoing need to increase fan pressure development capa

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Anusonti-Inthra, P., F. Gandhi, and L. Miller. "Reduction of helicopter vibration through cyclic control of variable orifice dampers." Aeronautical Journal 107, no. 1077 (2003): 657–72. http://dx.doi.org/10.1017/s0001924000013531.

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Abstract The present study demonstrates that cyclically varying the damping coefficient of controllable lag and flap dampers can reduce the 4/rev vibratory hub loads of a four-bladed hingeless rotor helicopter in high speed forward flight. Gradient-based optimization is used to determine the optimal multi-cyclic damping variation inputs that minimise a composite vibration index comprising of all six components of vibratory hub loads. Optimal 2/rev and 3/rev variations in the lag damping coefficient virtually eliminate the vibratory hub drag force and yawing moments, and produce small reduction

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Naji, Abdullah Mezaal, K. V. Osintsev, and S.V. Alyukov. "The computational fluid dynamics performance analysis of horizontal axis wind turbine." International Journal of Power Electronics and Drive System (IJPEDS) 10, no. 2 (2019): 1072–80. https://doi.org/10.11591/ijpeds.v10.i2.pp1072-1080.

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Computational fluid dynamics (CFD) simulations were performed in the present study using ANSYS Fluent 18.0, a commercially available CFD package, to characterize the behaviour of the new HAWT. Static threedimensional CFD simulations were conducted. The static torque characteristics of the turbine and the simplicity of design highlight its suitability for the GE 1.5xle turbine. The major factor for generating the power through the HAWT is the velocity of air and the position of the blade angle in the HAWT blade assembly. The paper presents the effect of The blade is 43.2 m length and starts wit

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Lin, Jinbao, Yanjuan Jin, Zhu Zhang, and Xiaochao Cui. "Strength Analysis of the Carbon-Fiber Reinforced Polymer Impeller Based on Fluid Solid Coupling Method." Mathematical Problems in Engineering 2014 (2014): 1–3. http://dx.doi.org/10.1155/2014/803261.

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Carbon-fiber reinforced polymer material impeller is designed for the centrifugal pump to deliver corrosive, toxic, and abrasive media in the chemical and pharmaceutical industries. The pressure-velocity coupling fields in the pump are obtained from the CFD simulation. The stress distribution of the impeller couple caused by the flow water pressure and rotation centrifugal force of the blade is analyzed using one-way fluid-solid coupling method. Results show that the strength of the impeller can meet the requirement of the centrifugal pumps, and the largest stress occurred around the blades ro

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Zhang, Pan, Xiwei Ke, Weiliang Wang, et al. "Investigation on the Aerodynamic Performance of High-Pressure Cylinders under the Mode of Regulating Steam Supply with an Intermedium-Pressure Adjustment Valve." Processes 11, no. 4 (2023): 1214. http://dx.doi.org/10.3390/pr11041214.

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In order to investigate the operational performance of the high-pressure (HP) cylinder towards a 300 MW boiler unit, the three-dimensional calculation method was applied to simulate the aerodynamic flow characteristics of the last five stage cylinder blades, including limiting streamline, isentropic efficiency along the blade height, and relative work amounts. Simulation results show that with the back pressure controlled at 3.4 MPa and the inlet steam flow decreasing to a certain extent, the flow state of the last three stage blades begins to deteriorate. When the back pressure continues to d

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Mezaal, Naji Abdullah, Osintsev K. V., and Alyukov S.V. "The Computational fluid dynamics Performance Analysis of Horizontal Axis Wind Turbine." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 2 (2019): 1072. http://dx.doi.org/10.11591/ijpeds.v10.i2.pp1072-1080.

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<span lang="EN-US">Computational fluid dynamics (CFD) simulations were performed in the present study using ANSYS Fluent 18.0, a commercially available CFD package, to characterize the behaviour of the new HAWT. Static three-dimensional CFD simulations were conducted. The static torque characteristics of the turbine and the simplicity of design highlight its suitability for the GE 1.5xle turbine. The major factor for generating the power through the HAWT is the velocity of air and the position of the blade angle in the HAWT blade assembly. The study presents the effect of The blade is 43

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Hannun, Rafid M., Hazim I. Radhi, and Noura A. Essi. "The types of mechanical and thermal stresses on the first stage rotor blade of a turbine." Innovaciencia Facultad de Ciencias Exactas Físicas y Naturales 7, no. 1 (2019): 1–11. http://dx.doi.org/10.15649/2346075x.513.

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Introduction: In this paper, the simulation of first stage of low pressure turbine for Nasiriya Power Plant was done to study the aerodynamic characteristic of steam along stage at load 70 MW, also the two types of mechanical stresses on the first stage rotor blade were studied in this paper. Materials and Methods:The material of blade was X20Cr13 stainless steel grade 1.4021. The first type of mechanical stresses which due to the steam pressure on the blade was analyzed. The seconds types of mechanical stresses that the centrifugal stresses on the blade. The AutoCAD software code was used for

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Kumar, M. Rohin, and C. Venkatesan. "Effects of blade configuration parameters on helicopter rotor structural dynamics and whirl tower loads." Aeronautical Journal 120, no. 1224 (2016): 271–90. http://dx.doi.org/10.1017/aer.2015.11.

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ABSTRACTThe influence of the blade geometric parameters on the structural dynamic characteristics, response and loads of a helicopter rotor under hover condition in a whirl tower was investigated. A general geometry was considered for the rotor blade which included configuration parameters like root offset, torque offset, pre-twist, pre-cone, pre-droop, pre-sweep, tip-sweep and tip-anhedral. The option of placing concentrated masses at any location on the blade was also included. Natural frequencies and the corresponding mode shapes of the rotating blade were obtained by solving the linear, un

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Mohamad, Barhm, and salah Amroune. "Geometric regeneration and mechanical analysis of a gas turbine blade type Frame 9001 GE." Engineering Solid Mechanics 6, no. 2 (2019): http://growingscience.com/beta/esm/2734—geometric—regeneration—and—mechanical—analysis—of—a—gas—turbine—blade—type—frame—9001—ge.html. https://doi.org/10.5267/j.esm.2018.3.003.

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Simulation and visualization of the mechanical components have become a predominant phase during the design and the production stages. Several means are used to improve the design and to reduce study time. Today, the powerful hardware and the software available on the market have contributed greatly on the improvement of design, visualization and manufacturing process of complex parts (turbine blade). In this context, our study is a contribution to the establishment of a methodology to a CAD modelling and finite element analysis, which allows us to identify the mechanical behavior of a gas tur

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Antony Harison, M. C., M. Swamy, A. H. V. Pavan, and G. Jayaraman. "Root Cause Analysis of Steam Turbine Blade Failure." Transactions of the Indian Institute of Metals 69, no. 2 (2015): 659–63. http://dx.doi.org/10.1007/s12666-015-0750-2.

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Cui, Jiaping, Zhigang Cao, Pin Lyu, et al. "Research on the Blades and Performance of Semi-Submersible Wind Turbines with Different Capacities." Energies 17, no. 13 (2024): 3259. http://dx.doi.org/10.3390/en17133259.

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With the gradual increase in the maturity of wind energy technology, floating offshore wind turbines have progressively moved from small-capacity demonstrations to large-capacity commercial applications. As a direct component of wind turbines used to capture wind energy, an increase in the blade length directly leads to an increase in blade flexibility and a decrease in aerodynamic performance. Furthermore, if the floater has an additional six degrees of freedom, the movement and load of the blade under the combined action of wind and waves are more complicated. In this work, two types of semi

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