Non Contact Measurement System with Electromagnets for Vibration Tests on Bladed Disks

Firrone, Christian Maria; Berruti, Teresa Maria

doi:10.5772/36948

Cited by 1 publication

(2 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental results of the forced response measurements are available from the Octopus test rig described by Berruti et al (2011) and Firrone et al (2012). A selection of experimental FRFs are here compared with the calculation results in order to check whether each choice of contact parameters is correct.…”

Section: Resultsmentioning

confidence: 99%

“…The bladed disk carries between each couple of blades a cylindrical UPD, sketched in Figure 2a and shown in Figure 10a. This blisk and the UPDs were chosen as a test case since they are part of a test rig (Octopus test rig) (Berruti et al, 2011;Firrone and Berruti, 2012) that provides experimental forced response of blisks with UPDs under controlled conditions.…”

Section: Bladed Disk With Underplatform Dampersmentioning

confidence: 99%

See 1 more Smart Citation

On the choice of contact parameters for the forced response calculation of a bladed disk with underplatform dampers

Gastaldi

Grossi

Berruti

2017

J. Glob. Power Propuls. Soc.

View full text Add to dashboard Cite

Underplatform dampers (UPDs) are still in use to reduce the vibration amplitude of turbine blades and to shift the position of resonant frequencies. The dynamics of blades with UPDs is nonlinear and the analysis is challenging from both the experimental and the numerical point of view. A key point in obtaining a predictive numerical tool is the choice of the correct contact parameters (contact stiffness and friction coefficient) that are required as input to the contact model. The paper presents different approaches to choose these parameters: the contact stiffness in normal and tangential direction are both calculated and measured. The calculation is based on the analytical models in literature, the measurements are carried out on a dedicated test rig. The friction coefficient is also measured. Test results of the forced response of the same bladed disk with UPDs are available for each blade, they come from an experimental campaign under controlled excitation and centrifugal force. The forced response of the bladed disk is not used as a mean to tune the contact parameters, but rather as a validation tool: the effect of the different choices of contact parameters in the code is highlighted by the comparison of the calculated and experimental forced response of the bladed disk.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Bladed Disk With Underplatform Dampersmentioning

confidence: 99%