Imperial College London


Faculty of EngineeringDepartment of Mechanical Engineering

Research Fellow



+44 (0)20 7594 2243l.salles Website




Mr Peter Higgs +44 (0)20 7594 7078




556City and Guilds BuildingSouth Kensington Campus






BibTex format

author = {Pesaresi, L and Salles, L and Jones, A and Green, JS and Schwingshackl, CW},
doi = {10.1016/j.ymssp.2016.09.007},
journal = {Mechanical Systems and Signal Processing},
pages = {662--679},
title = {Modelling the nonlinear behaviour of an underplatform damper test rig for turbine applications},
url = {},
volume = {85},
year = {2016}

RIS format (EndNote, RefMan)

AB - Underplatform dampers (UPD) are commonly used in aircraft engines to mitigate the risk of high-cycle fatiguefailure of turbine blades. The energy dissipated at the friction contact interface of the damper reduces the vibrationamplitude significantly, and the couplings of the blades can also lead to significant shifts of the resonance frequenciesof the bladed disk. The highly nonlinear behaviour of bladed disks constrained by UPDs requires an advancedmodelling approach to ensure that the correct damper geometry is selected during the design of the turbine, and thatno unexpected resonance frequencies and amplitudes will occur in operation. Approaches based on an explicit modelof the damper in combination with multi-harmonic balance solvers have emerged as a promising way to predict thenonlinear behaviour of UPDs correctly, however rigorous experimental validations are required before approaches ofthis type can be used with confidence.In this study, a nonlinear analysis based on an updated explicit damper model having different levels of detail isperformed, and the results are evaluated against a newly-developed UPD test rig. Detailed linear finite element modelsare used as input for the nonlinear analysis, allowing the inclusion of damper flexibility and inertia effects. The nonlinearfriction interface between the blades and the damper is described with a dense grid of 3D friction contact elementswhich allow accurate capturing of the underlying nonlinear mechanism that drives the global nonlinear behaviour. Theintroduced explicit damper model showed a great dependence on the correct contact pressure distribution. The use ofan accurate, measurement based, distribution, better matched the nonlinear dynamic behaviour of the test rig. Goodagreement with the measured frequency response data could only be reached when the zero harmonic term (constantterm) was included in the multi-harmonic expansion of the nonlinear problem, highlighting its importance when thecontact inter
AU - Pesaresi,L
AU - Salles,L
AU - Jones,A
AU - Green,JS
AU - Schwingshackl,CW
DO - 10.1016/j.ymssp.2016.09.007
EP - 679
PY - 2016///
SN - 1096-1216
SP - 662
TI - Modelling the nonlinear behaviour of an underplatform damper test rig for turbine applications
T2 - Mechanical Systems and Signal Processing
UR -
UR -
VL - 85
ER -