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RISA Model Reduction Method for Bladed Disks With Large Geometric Mistuning Using a Partially Reduced Intermediate System Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Reduced order models (ROMs) are widely used to enable efficient simulation of mistuned bladed disks. ROMs based on projecting the system dynamics into a subspace spanned by the modes of the tuned structure work well for ...
Equivalent Linearization of Bladed Disk Assemblies With Friction Nonlinearities Under Random Excitation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This article addresses the vibrational behavior of bladed disk assemblies with nonlinear shroud coupling under random excitation. In order to increase the service life and safety of turbine blades, intense calculations are ...
Measured and Simulated Forced Response of a Rotating Turbine Disk With Asymmetric and Cylindrical Underplatform Dampers
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The dynamics of turbine blades with underplatform dampers (UPDs) is often experimentally explored by using small test rigs like two-blade models for cost and complexity reasons. In this paper, the dynamics of a large-scale ...
A Taylor Series Expansion Approach for Nonlinear Blade Forced Response Prediction Considering Variable Rotational Speed
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In the field of turbomachinery, great efforts are made to enhance computational tools to obtain reliable predictions of the vibrational behavior of friction-damped bladed disks. As a trade-off between computational burden ...
On the Interaction of Multiple Traveling Wave Modes in the Flutter Vibrations of Friction-Damped Tuned Bladed Disks
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: It is well-known that flutter vibrations of bladed disks can be saturated by dry friction. Previous theoretical investigations indicated that the steady-state, friction-damped flutter vibrations of tuned bladed disks are ...
Intentional Response Reduction by Harmonic Mistuning of Bladed Disks With Aerodynamic Damping
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A harmonic mistuning concept for bladed disks is analyzed in order to intentionally reduce the forced response of specific modes below their tuned amplitude level. By splitting a mode pair associated with a specific nodal ...
Approximate Solution of the Fokker–Planck Equation for a Multidegree of Freedom Frictionally Damped Bladed Disk Under Random Excitation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Bladed disks are subjected to different types of excitations, which cannot, in any, case be described in a deterministic manner. Fuzzy factors, such as slightly varying airflow or density fluctuation, can lead to an uncertain ...
Influence of Geometric Design Parameters Onto Vibratory Response and High-Cycle Fatigue Safety for Turbine Blades With Friction Damper
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Among the major concerns for high aspect-ratio, turbine blades are forced and self-excited (flutter) vibrations, which can cause failure by high-cycle fatigue (HCF). The introduction of friction damping in turbine blades, ...
Key Features of the Transient Amplification of Mistuned Systems
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The dynamic behavior of bladed disks in resonance crossing has been intensively investigated in the community of turbomachinery, addressing the attention to (1) the transient-type response that appear when the resonance ...
Rig and Engine Validation of the Nonlinear Forced Response Analysis Performed by the Tool OrAgL
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Since the first nonlinear forced response validation of frictionally coupled bladed disks, more than 20 years have passed, and numerous incremental modeling and simulation refinements were proposed. With the present work, ...