Nonsynchronous vibrations of turbomachinery bladed discs

The Effects of Detuning upon the Vibration of Bladed Discs

Optimization of Mistuned Bladed Discs Using Gradient-based Response Surface Approximations

The problem of searching for the best arrangement of mistuned blades on a bladed disc is formulated and solved as a combinatorial optimization problem. The maximum response level is chosen as the objective function and the individual blade mistunings are the design variables. Gradient-based response surface approximations are built for the objective function benefiting from a inexpensive calcul...

A Method for Use of Cyclic Symmetry Properties in Analysis of Nonlinear Multiharmonic Vibrations of Bladed Disks

An effective method for analysis of periodic forced response of nonlinear cyclically symmetric structures has been developed. The method allows multiharmonic forced response to be calculated for a whole bladed disk using a periodic sector model without any loss of accuracy in calculations and modeling. A rigorous proof of the validity of the reduction of the whole nonlinear structure to a secto...

Multidisciplinary Optimization in Turbomachinery Design

This paper investigates particular aspects of performing multidisciplinary optimizations in different turbomachinery design steps. The differences in the optimization approaches and used methods in preliminary and final design steps are shown. An optimization environment is developed, which supports multidisciplinary turbomachinery design. The general concept and components are explained. Some ...

Turbomachinery CFD on Parallel Computers

The role of multistage turbomachinery simulation in the development of propulsion system models is discussed. Particularly, the need for simulations with higher fidelity and faster turnaround time is highlighted. It is shown how such fast simulations can be used in engineering-oriented environments. The use of parallel processing to achieve the required turnaround times is discussed. Current wo...