Read Vibration Control in Turbomachinery Using Active Magnetic Journal Bearings - National Aeronautics and Space Administration | ePub
Related searches:
Jan 1, 2003 viscoelastic vibration dampers for turbomachine blades torsion-mode blade vibrations, which are excited by unsteady aerodynamic forces.
The results demonstrate that passive eddy-current damping is a viable candidate for vibration control in cryogenic turbomachinery.
A phase shaping method provided sufficient damping for the 1st bending mode of the rotor. The structure vibration instability was avoided by adjusting the joint strength between two parts of the pump housing. The gyroscopic effects also destroyed the stability of unbalance control algorithms for the ambs at a high rotation speed.
3 what controls blade vibrations of turbomachinery blades? as vibrations in turbo engines have been a problem since the early beginning of their development,.
Many high speed turbomachines operate above their first critical speed and thus, pass through one or more resonant frequencies during start-up. This can result in momentary vibration spikes, which is a normal condition.
One of the most common malfunctions in modern high speed, high efficiency turbomachinery is contact between the rotating and stationary elements of the machine. This paper defines rub mechanisms and then uses case histories of known rubs to illustrate how to diagnose a rub from vibration signals.
Modeling techniques used to model friction dampers in turbomachinery. Control of vibration and resonance in aero engines and rotating.
Turbomachinery controls and instru- tim shea, senior analyst, arc advi- ovation also supports integrated vibration son performed steam turbine mechanical.
The results of the previous calculation study agree well with the experimental data on the torsional vibration control.
Piezoelectricity; vibrations; energy harvesting; vibration control; transient vibration turbomachinery blade vibrations, namely resonance frequency detuning.
Proceedings of the asme 1998 international gas turbine and aeroengine congress and exhibition.
* state-of-the-art methods for vibration prediction, measurement, and monitoring and fatigue analysis.
The turbomachinery blade design has been extensively adopted in turbine tailored vibration response and flutter control of high-bypass shroudless fans.
Rubs may be caused by an unbalanced rotor, clearances that are too tight, differential thermal growth of various components, mis-alignment, instability, or other.
In the mechanical design of turbomachinery, it is critical to determine the natural frequencies of vibration—of individual components such as radial and axial compressors and turbines using finite element analysis in a software package such as pbfea, as well as the complete rotor assembly via rotordynamic analysis in a software package such.
Vibration monitoring is important in determining the condition of turbomachines. For example, a high vibration may be caused from an excitation mechanism of a gas labyrinth seal or from an aerodynamic excitation caused by pressure distortion in a high-pressure turbo-compressor.
These devices have numerous potential applications, including actuation, sensing, structural health monitoring, and vibration control -- the latter of which is of particular interest here. This work seeks to develop an understanding of energy harvesting behavior within the framework of a semi-active technique for reducing turbomachinery blade.
Dynamics and active bending vibration control of turbomachinery rotating blades featuring temperature-dependent material properties july 2004 journal of thermal stresses 27(7):625-644.
A method for reducing blade vibration in turbo-machinery is described. The method involves inserting flow obstructions and/or gas injections upstream of vibrating blades in such a manner that power flow into the blades is reduced by means of cancellation within a modal power integral.
Are widely installed on all types of low speed turbomachinery, especially hydro combustion and vibration monitoring (cp and ca sensors, with vm600).
Turbomachinery requires a higher level of vibration analysis than general purpose machinery. This includes identifying natural frequencies or modes of a system to determine if a potential resonance occurs.
Modelling and control of turbomachinery vibrations the authors describe an integrated approach to the modelling and active control of lateral vibrations in turbomachinery. Starting with consideration of the control of multiple rotor bending modes, the generation of a state vector from available.
An analysis and curves are provided for some common types of turbomachinery bearings which can be used to correlate mils of vibration with bearing dynamic load. The analysis shows that the percent of bearing clearance consumed by a vibrating jour.
Addressing high sub-synchronous vibrations in a turboexpander equipped with active magnetic bearings.
Turbomachinery vibration analyzer for continuous vibration monitoring and turbomachinery vibration analysis with bode plot, polar plot, orbit, filtered orbit.
Fluid dynamics and heat transfermechanical vibration analysis and resource for anyone involved in vibration control, including vibration control analysts,.
Floor vibration control using three-degree-of-freedom tuned mass dampers. Proceedings of the asme 2004 international mechanical engineering congress and exposition.
In-flight blade and rotor vibration monitoring, combined with ground-based fleet usage and fault database, offers a great potential to reduce high maintenance.
Vibration isolation of rotating machinery by parameters switched magnetic bearing and high static low dynamic stiffness supports. Proceedings of the asme turbo expo 2018: turbomachinery technical conference and exposition.
Abstract— vibrations of turbomachinery blades are critical to jet engine durability and performance.
Dynamics and vibrations of gas turbine engines and other turbomachinery propconel – “more electric, advanced hydromechanics propeller control.
Post Your Comments: