000			02547nam a22001697a 4500
082			_a621.431 5 _bSu46D
100			_aSukhwal, Nitin _926532
245			_aDynamic Analysis Of Turbine Blades In Contact _cby Nitin Sukhwal
260			_aIIT Jodhpur _bDepartment of Mechanical Engineering _c2020
300			_axviii,55p. _bHB
520			_aTurbojets and turbofans are air breathing jet engines that are widely used in aircraft propulsion. Each fan blade carries a load equivalent of nine double-decker buses and swallows the volume of a squash court every second. Cruise missiles, supersonic figh-ters, and hovercraft are some examples of high speed transportation and combating machines, which are driven by turbomachines. The major problem associated with tur-bomachines is its failures in-service results in high costs for repair, safety risks and losses of non-operational income. Thus, the reliability of these blades is very important for the successful operation of the turbo-machine. The frequently identified cause of blade failure is vibration in turbine blades. Resonance is a severe problem, which causes turbine blade failure, and this condition occurs when natural frequency of the rotating body is equal to the rotational speed of the body. Since resonant condition cannot be avoided always, a possible way to avoid the risk of blade failure is by incorporating some kind of friction damping created due to the loading between contacting surfaces at the tip of the blades. This mechanism re-sults in physically limiting the vibrational amplitude on the blade tip. This is achieved by leaving a small gap between the shrouds of adjacent blades. The main objective of this study is to perform the dynamic analysis of the turbine blades in contact. This has nonlinear response problem has been analyzed by varying the gap between the shrouded tip of turbine blades. For this study, a turbine disc-blade assembly model has been developed in SOLIDWORKS® followed by performing modal analysis in AN-SYS® workbench, and the blade response is evaluated in time domain using Newmark-beta method. The response calculations have been performed for different values of spring and damping constants to identify their effect on the blade response. From these response curves, the relation between vibration amplitude and gap between the shrouds has been identified.
650			_aTurbine Blades _926533
650			_aMTech Theses _926534
650			_aDepartment of Mechanical Engineering _926535
700			_aVenkatesan, C. _926536
942			_cTH
999			_c14769 _d14769