Experimental analysis and simulation of torsional vibration of shaft with curvature and twisting defects

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Experimental analysis and simulation of torsional vibration of shaft with curvature and twisting defects

ارائه دهنده: Provider: Milad Mohammadi

اساتید راهنما: Supervisors: Mahdi Karimi(PhD)

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: دکتر علیرضا شوشتری - دکتر هاشم مظاهری

زمان و تاریخ ارائه: Time and date of presentation: 17 November 2020

مکان ارائه: Place of presentation:

چکیده: Abstract: Shafts are one of the main and very important components of mechanical devices, their failure or malfunction causes a complete stop of the device and imposes high costs. Therefore, it is very important to pay attention to their design and construction. Due to the distortion and change in length of the shafts during the operation of turbomachines at high temperatures, in this study, the occurrence of flexural stresses in the shaft of a gas turbine with retaining bases is investigated. For this purpose, numerical simulation of shaft bearing housing retaining bases will be performed under loading at gas turbine operating temperatures in Ensys software. The type of loading in this analysis is intermittent loading under high temperatures, so that by defining a periodic time function in the software, the rotational load due to the turbine rotation can be applied to the shaft bearing. In order to apply the correct material properties of the shaft, using the pressure mechanism, the reinforcement of the autofertilization process is applied on the steel of the shaft. Next, the numerical results of the equivalent and equivalent stress distribution in the wall of a thin-walled cylindrical wall shaft are optimized by linear stiffness behavior and considering the Bauschinger effects. Finally Simulated Shaft Geometric Dimensions Method Surface Vibration Properties. in order to find the natural frequency and stress ( in bending , torsion and bending modes ) in shaft axis by response surface method ( rsm ) , several analysis were performed by finite element method and then polynomial function was obtained . the output of this research is to optimize the optimized geometry of a gas turbine capable of having special loading conditions with the same way to improve the mechanical and vibration performance of different configurations

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