Title: Design and Analysis of Helicopter Rotor Hub for Structural Loads
Authors: Ms.S.Alka & Mr.T.Syam Pradeep
Organisation: Marri Laxman Reddy Institute of Technology and Management
ABSTRACT:
The rotor system is the rotating part of a helicopter which generates lift. The rotor consists of a mast, hub, and rotor blades. The mast is a hollow cylindrical metal shaft which extends upwards from and is driven and sometimes supported by the transmission. At the top of the mast is the attachment point for the rotor blades called the hub. The rotor blades are then attached to the hub by any number of different methods. Main rotor systems are classified according to how the main rotor blades are attached and move relative to the main rotor hub. As the rotor spins, each blade responds to inputs from the control system to enable helicopter control. The center of lift on the whole rotor system moves in response to these inputs to effect pitch, roll, and upward motion. Here the helicopter rotor hub must carry the blade weight and aerodynamic forces as rotational speeds. For that case, of helicopter rotor hub strength will be calculated. The dynamic characteristics analysis of rotor hub is mainly involved in the calculation about natural frequency and operating frequencies. The objective is to calculate the natural frequency and operating frequencies of rotor hub is modulating those frequencies and avoiding resonance at rotational speeds and blade weights, thus the vibrations of helicopter may reduce. In this project, the 3D model of helicopter main rotor hub shall be done in UNIGRAPHICS and imported into ANSYS software to perform static and dynamic analysis to analyze strength and dynamic characteristics of rotor hub and optimize by using different materials for weight reduction.
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