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RISMulti-Wave Vibration Caused by Flutter Instability and Nonlinear Tip-Shroud Friction
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Measurements revealed the contribution of multiple traveling waves to the flutter vibrations of bladed disks. Saturated flutter vibration, whether in this multi-wave or in its better-understood single-wave form, is a ...
Effect of Modal Interactions on Friction-Damped Self-Excited Vibrations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: It is well-known that nonlinear dry friction damping has the potential to bound the otherwise unboundedly growing vibrations of self-excited structures. An important technical example are the flutter-induced friction-damped ...
Analysis of the Effect of Multirow and Multipassage Aerodynamic Interaction on the Forced Response Variation in a Compressor Configuration—Part II: Effects of Additional Structural Mistuning
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The prediction of aerodynamic blade forcing is a very important topic in turbomachinery design. Usually, the wake from the upstream blade row and the potential field from the downstream blade row are considered as the main ...
Analysis of Friction-Saturated Flutter Vibrations With a Fully Coupled Frequency Domain Method
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Flutter stability is a dominant design constraint of modern turbines. Thus, flutter-tolerant designs are currently explored, where the resulting vibrations remain within acceptable bounds. In particular, friction damping ...
Validation of a Turbine Blade Component Test With Frictional Contacts by Phase-Locked-Loop and Force-Controlled Measurements
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, a validation approach for a turbine blade component test with frictional contacts is presented. The investigated system is derived from a high cycle fatigue test setup, where a turbine blade is base-excited ...
Fully Coupled Analysis of Flutter Induced Limit Cycles: Frequency Versus Time Domain Methods
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: To save resources and reduce emissions, it is crucial to reduce weight of aircraft engines and further increase aerodynamic efficiency of gas and steam turbines. For turbine blades, these goals often lead to flutter. Thus, ...
Friction Saturated Limit Cycle Oscillations—Test Rig Design and Validation of Numerical Prediction Methods
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, an experimental test rig for friction saturated limit cycle oscillations is proposed to provide a validation basis for corresponding numerical methods. Having in mind the application of turbine blades, an ...
Modeling Complex Contact Conditions and Their Effect on Blade Dynamics
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Dry friction devices such as underplatform dampers are commonly included in turbine bladed disks designs to mitigate structural vibrations and avoid high cycle fatigue failures. The design of frictionally damped bladed ...
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, ...
How Intrusive Are Accelerometers for Measuring Nonlinear Vibrations? A Case Study on a Compressor Blade Subjected to Vibro-Impact Dynamics
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A characteristic feature of nonlinear vibrations is the energy transfer among different parts or modes of a mechanical system. Moreover, nonlinear vibrations are often non-periodic, even at steady state. To analyze these ...