New Proposed Design of Rotor Shaft Equipped with Blades Inside a SSHE

2020 ◽  
pp. 428-434
Author(s):  
Rabeb Triki ◽  
Hassene Djemel ◽  
Mounir Baccar
Keyword(s):  
Rotor Shaft

Experimental and Analytical Investigations of a Low Pressure Model Turbine During Forced Response Excitation

2010 ◽  
Author(s):  
Christoph Heinz ◽  
Markus Schatz ◽  
Michael V. Casey ◽  
Heinrich Stu¨er
Keyword(s):  
Degrees Of Freedom ◽  
Timing Analysis ◽  
Dynamic Performance ◽  
Amplitude Distribution ◽  
Low Pressure ◽  
Forced Response ◽  
Operating Conditions ◽  
Linear Regression Method ◽  
Rotor Shaft ◽  
Aerodynamic Damping

To guarantee a faultless operation of a turbine it is necessary to know the dynamic performance of the machine especially during start-up and shut-down. In this paper the vibration behaviour of a low pressure model steam turbine which has been intentionally mistuned is investigated at the resonance point of an eigenfrequency crossing an engine order. Strain gauge measurements as well as tip timing analysis have been used, whereby a very good agreement is found between the methods. To enhance the interpretation of the data measured, an analytical mass-spring-model, which incorporates degrees of freedom for the blades as well as for the rotor shaft, is presented. The vibration amplitude varies strongly from blade to blade. This is caused by the mistuning parameters and the coupling through the rotor shaft. This circumferential blade amplitude distribution is investigated at different operating conditions. The results show an increasing aerodynamic coupling with increasing fluid density, which becomes visible in a changing circumferential blade amplitude distribution. Furthermore the blade amplitudes rise non-linearly with increasing flow velocity, while the amplitude distribution is almost independent. Additionally, the mechanical and aerodynamic damping parameters are calculated by means of a non-linear regression method. Based on measurements at different density conditions, it is possible to extrapolate the damping parameters down to vacuum conditions, where aerodynamic damping is absent. Hence the material damping parameter can be determined.

Adaptive back-stepping tracking control for rotor shaft tilting of active magnetically suspended momentum wheel

2014 ◽  
Vol 53 (6) ◽  
pp. 1892-1900 ◽  
Author(s):  
Yuan-jin Yu ◽  
Jian-cheng Fang ◽  
Biao Xiang ◽  
Chun-e Wang
Keyword(s):  
Tracking Control ◽  
Rotor Shaft

Calculating bending vibrations of main axial mine fan rotor shaft

2016 ◽  
Vol 52 (3) ◽  
pp. 502-510 ◽  
Author(s):  
A. M. Krasyuk ◽  
P. V. Kosykh
Keyword(s):  
Bending Vibrations ◽  
Rotor Shaft

scholarly journals Twisting of the Tail Rotor Shaft - A Case Study

2018 ◽  
Vol 778 ◽  
pp. 28-32
Author(s):  
Muhammad Shahzad ◽  
Tanveer Manzoor ◽  
Qanita Tayyaba ◽  
Ammad Hussain Qureshi
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Strain ◽  
Microstructural Analysis ◽  
Sem Images ◽  
Rotor Shaft ◽  
Ansys Simulation ◽  
Strain Rate Loading ◽  
Rule Out

Presented results report the findings of a case study carried out to determine the possible factors that lead to the twisting of tail rotor shaft. The structural materials of the shaft was evaluated in terms of microstructural analysis and mechanical properties to rule out any material fault. The SEM images showed that the localized fractures at twist ends occurred without any significant plastic deformation. Moreover, there was no evidence of fatigue. Such behavior suggests that twist occurred under impact / high strain rate loading. Such loading conditions are not possible during the event to ground hitting. The Ansys simulation confirmed that the observed twisting can increase the stress at localized point in excess of UTS and cause fracture.

Dynamic analysis of rotor–shaft systems with viscoelastically supported bearings

2000 ◽  
Vol 35 (9) ◽  
pp. 1313-1330 ◽  
Author(s):  
N.H. Shabaneh ◽  
Jean W. Zu
Keyword(s):  
Dynamic Analysis ◽  
Rotor Shaft

scholarly journals FEA-Analysis of Shaft and Supports Deformations for Huge Precise Lathe. Statics and Resonances

2018 ◽  
Vol 1 (1) ◽  
pp. 341-348
Author(s):  
Stanislau Dounar ◽  
Alexandre Lakimovitch ◽  
Andrei Ausiyevich ◽  
Andrzej Jakubowski
Keyword(s):  
System Simulation ◽  
Static Stiffness ◽  
Load Bearing ◽  
Machining Forces ◽  
Rotor Shaft ◽  
Fea Analysis ◽  
Bearing System

Abstract Load bearing system simulation is provided for a huge lathe to be renovated. Static and modal analyses are done by FEM. Focus was centerline rising, needed for larger rotor shaft machining. Forces between shaft and three supports were applied. Shaft static stiffness is lowered at 1.15 times only for 600 mm centerline rising. Supports have lost its rigidity at 1.42 times. Concrete pouring into bed cavities is recommended for supports flexibility limitation such as tailstock reinforcement. Robustness of bottom resonances is revealed both for rotor shaft (14.5–18.2 Hz) and supports (42.7–55.4 Hz). Centerline rising is allowed on 300 mm at least. It gives possibility to machine extremely large (up to ø2750 mm) shafts.

Sign in / Sign up

Export Citation Format

Share Document