Dynamic stress analysis of rotating twisted and tapered blades

Ramamurti, V.; Sreenivasamurthy, S.

doi:10.1243/03093247v153117

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…In 1980, the dynamic stress induced in rotating twisted and tapered wings was studied. This study employed finite element technique and was later verified by experimental methods [4]. Later, theoretical methods were verified and validated by experimental methods.…”

Section: Introductionmentioning

confidence: 89%

Finite Element Method for Analyzing Axial Fan Blade with Different Twist Angle and Chord Length

Abdallah¹,

Danardono²,

Triyono³

2015

IJERT

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The past decade has experienced a boom in industries and engineering. This has led to an increase in demand for power. The major power generators are wind farms, thermal power plants and hydroelectric power plants. All these industries employ a common method of harnessing power-Turbines. The efficiency of these turbines can be improved by reducing the material used or by increasing the longevity of the blades by either changing the chord length or the twist angle of the turbine blades. Based on the applications of the turbine, these blades have different geometries i.e. different airfoils, different chord lengths and different degrees of twists. The current paper attempts to analyze the effect of chord length and angle of twist on the von-mises stress distribution over the wing of a thin airfoil, namely NACA 5504 using finite element methods. The blade is assumed to be made of aluminum material.

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Section: Introductionmentioning

confidence: 89%

Finite Element Method for Analyzing Axial Fan Blade with Different Twist Angle and Chord Length

Abdallah¹,

Danardono²,

Triyono³

2015

IJERT

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“…At 383 rpm and 1000 rpm, the new shape functions in flap and lead-lag mode vary significantly from the polynomials (Figs. (7)-(8), (10)- (11)). But no significant variation is observed for the axial and the torsion shape functions at these rotation speeds (Figs.…”

Section: Analysis Of Shape Functionsmentioning

confidence: 99%

“…Leissa [10] used shell finite elements to study the vibrations of turbine engine blades. Ramamurti and Sreenivasamoorthy [11] used a three-dimensional, 20-noded isoparametric finite element for the analysis of the stresses in a rotating blade. Bogomolov et al [12] used a superparametric shell finite element to predict the vibrational characteristics of a real blade.…”

Section: Introductionmentioning

confidence: 99%

Superconvergent Finite Element for Coupled Torsional-Flexural-Axial Vibration Analysis of Rotating Blades

Chhabra

Ganguli

2010

International Journal for Computational Methods in Engineering

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A new two-noded, twelve degree of freedom finite element is developed for rotating blades. The shape functions are derived from the exact solutions of the governing static homogenous differential equations for the rotating blades. Such an approach leads to superconvergent elements. These differential equations include out-ofplane bending, in-plane bending, axial deformation, and torsion. The axial and torsion equations yield exact solutions and the flap and lag equations are solved by assuming a constant centrifugal force within the element. Differing from the conventional polynomial shape functions, the new shape functions account for the centrifugal stiffening effect as they depend upon the rotation speed, material properties, and the element position along the length of the blade. The finite element formulation is derived from the energy expressions using the Hamilton's principle. A convergence study for the natural frequencies is performed using the new shape functions and the polynomial shape functions for a coupled and an uncoupled blade. It is observed that the new shape functions lead to much more rapid convergence than the conventional polynomial shape functions for the first few modes at higher rotation speeds, where the effect of centrifugal stiffening is higher. The basis functions can also be used for finite element analysis of rotating rods and beams, and for energy methods.

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“…The unit capacity and pump-turbine diameter is increased gradually, the stiffness of the blade is decreased relatively, the probability of resonant vibration is increased also, and the operation stability is more focused [1,2] . As the primary component of the unit, the runner in the pump-turbine is usually subjected to hydraulic exciting vibration such as stator and rotor interference and tail water vortex, the blade fatigue cracks are appeared easily with the alternating stress.…”

Section: Introductionmentioning

confidence: 99%

Study of the Measurement Method on the Dynamic Stress and Pressure of Model Pump-turbine Splitter Blades

Yingnan,

Xiaolong,

Huanmao

et al. 2024

J. Phys.: Conf. Ser.

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The operation conditions of the pump-turbine are changed frequently and are worse than the conventional turbine. The operation stability of the pump-turbine is more focused with the incremental unit capacity and the pump-turbine runner diameter. The research of the measurement method for the dynamic stress and the pressure of the model pump-turbine splitter runner blades is performed to evaluate the stress and pressure distribution under the various operation conditions, it is optimized for the turbine mechanical and hydraulic computation, the operation references are provided for the prototype pump-turbine also. In this paper, the measurement positions of the blades are determined based on the hydraulic CFD and mechanical computation, the measurement method of dynamic stress and pressure of model pump turbine-runner splitter blades is studied.

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Dynamic stress analysis of rotating twisted and tapered blades

Cited by 12 publications

References 6 publications

Finite Element Method for Analyzing Axial Fan Blade with Different Twist Angle and Chord Length

Finite Element Method for Analyzing Axial Fan Blade with Different Twist Angle and Chord Length

Superconvergent Finite Element for Coupled Torsional-Flexural-Axial Vibration Analysis of Rotating Blades

Study of the Measurement Method on the Dynamic Stress and Pressure of Model Pump-turbine Splitter Blades

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