Aircraft Engines
We understand that computer simulation is one of the main directions for solution of the vibration reliability problem and improvement of the engine stabile dynamic characteristics.
A large number of R&D works conducted by United Engine Corporation (UEC) supported our company in creation of a software product that mostly solves practical problems of rotor dynamics – the DYNAMICS R4 system.
The program helps creation of engine models. The analysis results allow solution at all stages of the engine life cycle, design, development, operation. It helps technology improvement of assembling and balancing rotor systems. Our results ensure the dynamic strength of critical structural elements.
Modern GTE have specific features that impose certain requirements on computer simulation tools:
- Aero engines have multi-rotor structure with link elements between rotors.
- The gas turbine engine casing elements are highly flexible.
- Modern GTE rotors are usually “flexible”, i.e. their operating speed is near or above the bending critical speed.
- There is a high axial asymmetry in elastic and inertial parameters of the engine casing and mounts.
- The engine has a large number of cantilevered rotor stages.
- Rotor bearings may be equipped with damping units.
- Engines operate in various modes, at different operating loads and temperatures.
- Some of the advanced multi-stage engines have counter-rotating rotors.
- Dynamic characteristics of some elements are highly non-linear.
- In the engine there are numerous sources of non-synchronous vibration excitations (Unbalances can excite critical speeds with backward precession modes for rotor on orthotropic supports for example).
- Specific technology features of manufacturing and assembling have significant influence upon the engine dynamics.
The list above shows complexity of the task and the need for highly qualified engineers involved in this field of activity. Below are a few references on our experts published papers.
Project PD-14
