Abstract
The blisks and labyrinth seals in gas turbine engines are typical rotating periodic structures. Vibration problems will inevitably occur during the operation, which can easily lead to High Cycle Fatigue failure of the structure. Adding ring damper is an effective means of structural vibration reduction. The damper uses the dry friction of the contact surface to dissipate the vibration energy, improve the damping of the system, and then reduce the vibration response of the structure. The structures have a nodal diameter and modal shape, and the forced vibration often presents the characteristics of traveling wave. In this paper, an evaluation method for dry friction damping of ring damper under the axial component of traveling wave vibration is established. For the given vibration stress at the critical location, the equivalent damping ratio provided by the ring damper is calculated based on the friction energy dissipation and the damping characteristic curve that is the equivalent damping ratio varying with the vibration stress is obtained. This method can avoid calculating the nonlinear dry friction forced response and is suitable for the design stage. The damping of split ring dampers with rectangular section for one blisk and labyrinth seal is analyzed in this paper. It is shown that rotating speed, friction coefficient, section area and material density significantly influence the damping characteristics. There are many factors affecting the damping characteristics of the damping, so it is necessary to comprehensively consider various factors and multiple modes for vibration reduction design.
Highlights
The blade integrated disks and labyrinth seals in gas turbine engines are typical rotating periodic structures. These rotors bear the static stress caused by high centrifugal load and thermal load, and the vibration stress caused by changing load, which can cause High Cycle Fatigue (HCF) failure
An analytical method considering the damping characteristics of ring under axial motion is proposed for the traveling wave vibration of rotating periodic structure
The equivalent damping ratio provided by the ring is calculated by the energy method, and the damping characteristic curve is obtained
Summary
The blade integrated disks (blisks) and labyrinth seals in gas turbine engines are typical rotating periodic structures. Dry friction damping technology, which dissipates vibration energy through contact surface friction, is an effective means to reduce vibration stress in gas turbine engines [2]. The vibration of the rotors will lead to the relative sliding of the contact surface and reduce the vibration stress of the structure through friction energy dissipation. Considering that the typical steady-state stress and vibration stress range of the rotors are basically known, from the view of vibration stress and energy dissipation, this paper develops an analysis method and process of damping effect of rings, which avoids the calculation of nonlinear response. Aerospace 2021, 8, 302 from the view of vibration stress and energy dissipation, this paper develops an analysis method and process of damping effect of rings, which avoids the calculation of nonlinear response. VelocTitaykainndg athcceel6erNatDionviobfrtahteiomnaminosdtreuactsuarne aetxta=m0p. lIen, tFhiegfuigreur4e,sahmoaxwiss tthheemdaisxpimlaucmement, vamacceoccloevelcleeeimrtryaaettniaionotnondftthathhcaacettetrlhtiehnergeamtimisaoxzan1ix(mθoimuf, tmtu)h,measntmasdttaiaicittnsifcrmsifctrortiiutcoicotnitnoucnirasencdaapetntretopr=vmriod0ivn.eieItdndoetbththyoeeftrfidhigcaetmuidorpenai,mnaagnmpdrainixinngiges.rrtitThniahegle.mfoaTxrahcixaeeil.maxuimal movement of the ring is z1(θ, t), and its motion is determined by friction and inertial force
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