Computational methods for rotor dynamics simulation

What are the basics of rotor dynamics?
A rotor may have its natural frequencies excited by many sources: rotating imbalance, rubs, or process changes such as surge.
The first objective of rotor dynamics is to identify the resonant frequencies present in a system, determine their severity and, if necessary, design the system around them..
What are the basics of rotor dynamics?
At its most basic level, rotor dynamics is concerned with one or more mechanical structures (rotors) supported by bearings and influenced by internal phenomena that rotate around a single axis.
The supporting structure is called a stator..
What are the different types of rotor dynamics?
There are two types of rotordynamic analysis commonly performed on compressor drive trains: lateral and torsional.
Torsional analysis evaluates the twisting interaction between rotors and couplings.
A lateral analysis evaluates the rotor vibration in a compressor or train of equipment..
What is cross coupling in rotor dynamics?
The aerodynamic cross coupling is defined as the interaction of fluid forces with structural surfaces (both rotating and stationary).
It is mainly created due to the tip leakage flows , secondary flow in an impeller shroud or stator cavity flows.
The aerodynamic cross coupling varies depending on the type of seals..
What is rotordynamics analysis?
Rotor dynamics analysis is an important calculation step to design efficient and reliable rotating equipment.
When calculating the rotor dynamics of systems with hydrodynamic bearings, the non-linear fluid film forces are reduced to linearize stiffness and damping coefficients..
What is the application of rotor dynamics?
Rotordynamics (or rotor dynamics) is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures.
It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk storage..
The aerodynamic cross coupling is defined as the interaction of fluid forces with structural surfaces (both rotating and stationary).
It is mainly created due to the tip leakage flows , secondary flow in an impeller shroud or stator cavity flows.
The aerodynamic cross coupling varies depending on the type of seals.
The natural frequencies around 1,20.
1. Hz are generated from rotor

The book's first section focuses on the theoretical foundation of rotor dynamics, and the second concentrates on the engineering analysis of rotating structures

These are used to simulate behavior of rotational structures that enable the function of various types of machinery—from generators and wind turbines to

Dynamic stall on helicopter rotors

The dynamic stall is one of the hazardous phenomena on helicopter rotors, which can cause the onset of large torsional airloads and vibrations on the rotor blades.
Unlike fixed-wing aircraft, of which the stall occurs at relatively low flight speed, the dynamic stall on a helicopter rotor emerges at high airspeeds or/and during manoeuvres with high load factors of helicopters, when the angle of attack(AOA) of blade elements varies intensively due to time-dependent blade flapping, cyclic pitch and wake inflow.
For example, during forward flight at the velocity close to VNE, velocity, never exceed, the advancing and retreating blades almost reach their operation limits whereas flows are still attached to the blade surfaces.
That is, the advancing blades operate at high Mach numbers so low values of AOA is needed but shock-induced flow separation may happen, while the retreating blade operates at much lower Mach numbers but the high values of AoA result in the stall.

Computational methods for rotor dynamics simulation

What are the basics of rotor dynamics?

What are the basics of rotor dynamics?

What are the different types of rotor dynamics?

What is cross coupling in rotor dynamics?

What is rotordynamics analysis?

What is the application of rotor dynamics?