Helicopter rotor-fuselage aeroelasticity modeling and solution using the partition-iteration method

Xiong, Junato; Yu, Xiaoxiao

doi:10.1016/j.jsv.2006.12.009

Cited by 11 publications

(3 citation statements)

References 26 publications

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“…In this crossover, only one offspring was produced and characterized as the convex linear combination of the parents, and gene positioning was chosen at random by exchanging the positions of their respective genes. Following that, various types of real coded crossover operators [29], [30], [31], [32], [33], [34] were developed to achieve faster convergence as well as greater accuracy and efficiency. We develop a novel real-coded crossover operator for this purpose.…”

Section: Literature Reviewmentioning

confidence: 99%

Installation of Smog-Free Towers Using Novel Real Coded Genetic Algorithm

Kumar,

Deep,

Nagar

2024

IEEE Access

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The circle packing problem involves finding the best way to place non-overlapping circles within a given space, while the smog-free tower installation problem aims to minimize the exposure of residents to secondhand smog by identifying the optimal tower locations. This study proposes a Real Coded Genetic Algorithm (RCGA) that uses real-valued representations of circle positions to solve the smog-free tower installation problem. A new crossover operator is introduced, combining the information from two parent solutions to generate two new offspring solutions. The operator uses a random crossover point and two scaling factors to control the amount of information exchanged. The performance of the operator is evaluated on CEC-2017 benchmark problem set and compared to other commonly used operators, with results indicating that it produces high-quality solutions and outperforms other operators in terms of solution quality and convergence speed. This research contributes to developing effective optimization algorithms that can have important implications for improving public health and reducing the negative effects of secondhand smog.

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Section: Literature Reviewmentioning

confidence: 99%

Installation of Smog-Free Towers Using Novel Real Coded Genetic Algorithm

Kumar,

Deep,

Nagar

2024

IEEE Access

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“…Rotor blades are essential and critical components of helicopters, turbines, compressors, and other rotatory machinery ( [1]- [6]). Blade failure is a severe accident causing the entire machine to shut down.…”

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 equations are transformed to discrete form using finite elements, then to a state-space formulation, and finally decomposed into modes. Xiong and Yu [8] developed a coupled helicopter rotor-fuselage model and a partition-iteration solution to predict structural response and rotor blade vibration loads. Integral anisotropic active plies have been used by Cesnik and Shin [9] to model an asymptotical formulation for the preliminary design of multi-cell composite helicopter rotor blades.…”

Section: Introductionmentioning

confidence: 99%

Parametric modelling application to a twin rotor system using recursive least squares, genetic, and swarm optimization techniques

Toha

Tokhi

2010

Proceedings of the Institution of Mechanical Engineers, Part G:

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An essential step towards the solution of many scientific problems is to accomplish modelling and identification of the system under investigation. This paper endeavours to establish an empirical relationship between input and observed output data for the identification of a one-degree-of-freedom hovering motion model of a twin rotor multi-input—multi-output system (TRMS). The TRMS can be perceived as a static test rig for an air vehicle with formidable control challenges. Therefore, modelling of aerodynamic function of the system is needed and carried out in both time and frequency domains based on observed input and output data pairs. Improved algorithms of recursive least square, genetic algorithm, and particle swarm optimization are proposed to develop a parametric model to mimic the behaviour of the twin rotor system in hovering mode. A complete system identification procedure is carried out, from experimental design to model validation using a laboratory-scale helicopter. In this case, the identified model is characterized by a fourth-order linear auto-regressive moving average structure, which describes with very high precision the hovering motion of a TRMS. Experimental results are obtained using a laboratory set-up system, confirming the viability and effectiveness of the proposed methodology.

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Helicopter rotor-fuselage aeroelasticity modeling and solution using the partition-iteration method

Cited by 11 publications

References 26 publications

Installation of Smog-Free Towers Using Novel Real Coded Genetic Algorithm

Installation of Smog-Free Towers Using Novel Real Coded Genetic Algorithm

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

Parametric modelling application to a twin rotor system using recursive least squares, genetic, and swarm optimization techniques

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