CN-121997654-A - Abrasion evaluation method and related device for squirrel-cage elastic support dry friction damper under dynamic load

CN121997654ACN 121997654 ACN121997654 ACN 121997654ACN-121997654-A

Abstract

The invention discloses a method and a related device for evaluating abrasion of a squirrel-cage elastic support dry friction damper under dynamic load, wherein the method comprises the steps of applying dynamic load boundary conditions to a squirrel-cage elastic support dry friction damper finite element model, carrying out impact analysis of dynamic load parameters on abrasion based on the squirrel-cage elastic support dry friction damper finite element model, respectively changing positive pressure, exciting force and rotating speed through simulation, obtaining abrasion loss, contact stress and relative sliding distance change rules under the positive pressure, exciting force and rotating speed, carrying out impact analysis of squirrel-cage structural parameters on abrasion based on the squirrel-cage elastic support dry friction damper finite element model, respectively changing Poisson ratio, elastic modulus and rigidity of the squirrel-cage elastic support through simulation, and obtaining the impact rules of Poisson ratio, elastic modulus and rigidity on abrasion loss and squirrel-cage strip fillet stress.

Inventors

Hao Keshuang
ZHENG XIANGHUA
QIU HUA
JIANG GUANGZHENG
ZHOU YAOCHONG
WANG BAOYUN
KANG WEI
KONG LINGHUI
LI BAOGEN
FAN YANHONG

Assignees

华能云南滇东能源有限责任公司
西安热工研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20260121

Claims (10)

1. The method for evaluating the abrasion of the squirrel-cage elastic support dry friction damper under the dynamic load is characterized by comprising the following steps of: constructing a finite element model of the squirrel-cage elastic support dry friction damper; Constructing an Archard equation in a squirrel-cage elastic support dry friction damper finite element model; applying dynamic load boundary conditions to the squirrel-cage elastic support dry friction damper finite element model; Based on the squirrel-cage elastic support dry friction damper finite element model, carrying out dynamic load parameter impact analysis on abrasion, and respectively changing positive pressure, exciting force and rotating speed through simulation to obtain the abrasion loss, contact stress and relative sliding distance change rule under the positive pressure, exciting force and rotating speed; Based on a finite element model of the squirrel-cage elastic support dry friction damper, carrying out analysis on the influence of squirrel-cage structural parameters on abrasion, respectively changing the Poisson's ratio, elastic modulus and rigidity of the squirrel-cage elastic support through simulation, and obtaining the influence rules of the Poisson's ratio, elastic modulus and rigidity on the abrasion loss and the squirrel-cage strip fillet stress.
2. The method for evaluating wear of a squirrel-cage elastic support dry friction damper under dynamic load according to claim 1, wherein the squirrel-cage elastic support dry friction damper finite element model comprises a squirrel-cage elastic support, a dynamic friction plate and a static friction plate.
3. The method for evaluating wear of a squirrel-cage elastic support dry friction damper under dynamic load according to claim 1, wherein the process of constructing a squirrel-cage elastic support dry friction damper finite element model is as follows: Based on the actual structure of the squirrel-cage elastic support dry friction damper, establishing a 1:1 squirrel-cage elastic support dry friction damper finite element model by adopting ANSYS software, wherein the squirrel-cage elastic support dry friction damper finite element model comprises a squirrel-cage elastic support, a dynamic friction plate and a static friction plate; Setting the elastic modulus, poisson ratio and density of the squirrel-cage elastic support, the dynamic friction plate and the static friction plate materials based on experimental data; And carrying out grid division and verification on the finite element model of the squirrel-cage elastic support dry friction damper, wherein the abrasion contact surface is divided by adopting hexahedron grids, the rest part adopts tetrahedron grids, different grid densities are set for carrying out grid independence verification, and the size of the grids is determined.
4. The method for evaluating wear of a squirrel cage elastic support dry friction damper under dynamic load according to claim 1, wherein the expression of the Archard equation is: Wherein, the For the depth of wear of the nth node, For the coefficient of bulk wear, For the contact stress of the nth node of the ith increment step, The relative slippage increment of the nth node is the ith increment step.
5. A method for evaluating wear of a squirrel cage elastic support dry friction damper under dynamic load according to claim 3, wherein the process of applying dynamic load boundary conditions to the squirrel cage elastic support dry friction damper finite element model is as follows: The method comprises the steps of simulating periodic alternating load of a rotor, applying two groups of sinusoidal exciting forces with mutually perpendicular action directions and 90-DEG phase difference at radial round holes at the top of a squirrel-cage elastic support, applying uniformly distributed normal positive pressure at the top of a static friction plate to cover a transition critical value from sliding to viscous of friction pairs, setting contact parameters, friction coefficients between the friction pairs, simulating dry friction contact behavior by adopting a Coulomb friction model, applying fixed constraint on the bottom of the squirrel-cage elastic support, limiting displacement and rotation of the squirrel-cage elastic support, and adding constraint on the static friction plate to enable the static friction plate to move only in the axial direction.
6. The method for evaluating wear of a squirrel-cage elastic support dry friction damper under dynamic load according to claim 5, wherein the process of obtaining the wear amount, the contact stress and the relative sliding distance change rule under the positive pressure, the exciting force and the rotating speed by respectively changing the positive pressure, the exciting force and the rotating speed through simulation is as follows: maintaining the exciting force and frequency unchanged, changing the positive pressure at the top, and obtaining the abrasion loss and the contact state in a simulation way; Maintaining the positive pressure and the exciting force frequency unchanged, changing the exciting force, and obtaining the abrasion loss and the contact state in a simulation way; the exciting force and the top positive pressure are kept unchanged, the exciting force frequency is changed, and the abrasion loss and the contact state are obtained through simulation.
7. The method for evaluating the wear of the squirrel-cage elastic support dry friction damper under the dynamic load according to claim 6, wherein the process of obtaining the wear amount, the contact stress and the relative sliding distance change rule under the positive pressure, the exciting force and the rotating speed by respectively changing the positive pressure, the exciting force and the rotating speed through simulation is as follows: Keeping the rigidity and elastic modulus of the used material of the squirrel cage unchanged, changing the Poisson's ratio, and obtaining the abrasion loss and the fillet stress of the cage bars in a simulation mode; keeping the rigidity and poisson ratio of the used material of the squirrel cage unchanged, changing the elastic modulus, and obtaining the abrasion loss and the fillet stress of the cage bars in a simulation mode; the Poisson's ratio and the elastic modulus of the material used by the squirrel cage are kept unchanged, the rigidity is changed, and the abrasion loss and the fillet stress of the cage bars are obtained through simulation.
8. A squirrel cage spring support dry friction damper wear assessment system under dynamic load, comprising: the first construction module is used for constructing a finite element model of the squirrel-cage elastic support dry friction damper; the second construction module is used for constructing an Arcard equation in the finite element model of the squirrel-cage elastic support dry friction damper; the application module is used for applying dynamic load boundary conditions to the squirrel-cage elastic support dry friction damper finite element model; The first simulation module is used for carrying out the impact analysis of dynamic load parameters on abrasion based on the finite element model of the squirrel-cage elastic support dry friction damper, respectively changing positive pressure, exciting force and rotating speed through simulation, and obtaining the abrasion loss, contact stress and relative sliding distance change rule under the positive pressure, exciting force and rotating speed; The second simulation module is used for carrying out the influence analysis of the squirrel cage structural parameters on the abrasion based on the squirrel cage elastic support dry friction damper finite element model, respectively changing the Poisson ratio, the elastic modulus and the rigidity of the squirrel cage elastic support through simulation, and obtaining the influence rules of the Poisson ratio, the elastic modulus and the rigidity on the abrasion loss and the squirrel cage strip fillet stress.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, carries out the steps of the method for evaluating the wear of a squirrel cage spring support dry friction damper under dynamic load according to any one of claims 1-7.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method for evaluating wear of a squirrel cage resilient support dry friction damper under dynamic load according to any one of claims 1-7.

Description

Abrasion evaluation method and related device for squirrel-cage elastic support dry friction damper under dynamic load Technical Field The invention belongs to the technical field of vibration reduction of an aeroengine rotor system, and relates to a wear evaluation method and a related device for a squirrel cage elastic support dry friction damper under dynamic load. Background In order to pursue high thrust-weight ratio, a modern aero-engine rotor system generally adopts a flexible rotor structure, the working rotating speed of the rotor system is far higher than the first-order critical rotating speed, and a squirrel-cage elastic support dry friction damper is required to bear two-dimensional periodic alternating dynamic load transmitted by a rotor in the operation process. The damper dissipates vibration energy through dry friction of the friction pair, but micrometer micro-abrasion is easy to occur to the friction pair under the action of long-term dynamic load, so that vibration reduction performance is degraded, and even the stability of a rotor system is affected. Abrasion can change the surface morphology, contact rigidity and damping characteristics of the friction pair, so that vibration damping performance gradually declines, and instability of a rotor system can be caused when the vibration damping performance is serious, and safe operation of the whole life cycle of the aero-engine is threatened. At present, the abrasion evaluation of the elastic support dry friction damper has the problems of working condition simulation and actual disjointing, insufficient simulation precision, lack of evaluation system and the like. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a method and a related device for evaluating the abrasion of a squirrel-cage elastic support dry friction damper under dynamic load, wherein the method and the related device can overcome the problem of insufficient simulation precision of the abrasion scheme of the existing dry friction damper. In order to achieve the above purpose, the invention discloses a wear evaluation method of a squirrel-cage elastic support dry friction damper under dynamic load, comprising the following steps: constructing a finite element model of the squirrel-cage elastic support dry friction damper; Constructing an Archard equation in a squirrel-cage elastic support dry friction damper finite element model; applying dynamic load boundary conditions to the squirrel-cage elastic support dry friction damper finite element model; Based on the squirrel-cage elastic support dry friction damper finite element model, carrying out dynamic load parameter impact analysis on abrasion, and respectively changing positive pressure, exciting force and rotating speed through simulation to obtain the abrasion loss, contact stress and relative sliding distance change rule under the positive pressure, exciting force and rotating speed; Based on a finite element model of the squirrel-cage elastic support dry friction damper, carrying out analysis on the influence of squirrel-cage structural parameters on abrasion, respectively changing the Poisson's ratio, elastic modulus and rigidity of the squirrel-cage elastic support through simulation, and obtaining the influence rules of the Poisson's ratio, elastic modulus and rigidity on the abrasion loss and the squirrel-cage strip fillet stress. Further, the squirrel-cage elastic support dry friction damper finite element model comprises a squirrel-cage elastic support, a dynamic friction plate and a static friction plate. Further, the process for constructing the squirrel-cage elastic support dry friction damper finite element model comprises the following steps of: Based on the actual structure of the squirrel-cage elastic support dry friction damper, establishing a 1:1 squirrel-cage elastic support dry friction damper finite element model by adopting ANSYS software, wherein the squirrel-cage elastic support dry friction damper finite element model comprises a squirrel-cage elastic support, a dynamic friction plate and a static friction plate; Setting the elastic modulus, poisson ratio and density of the squirrel-cage elastic support, the dynamic friction plate and the static friction plate materials based on experimental data; And carrying out grid division and verification on the finite element model of the squirrel-cage elastic support dry friction damper, wherein the abrasion contact surface is divided by adopting hexahedron grids, the rest part adopts tetrahedron grids, different grid densities are set for carrying out grid independence verification, and the size of the grids is determined. Further, the expression of the Archard equation is: Wherein, the For the depth of wear of the nth node,For the coefficient of bulk wear,For the contact stress of the nth node of the ith increment step,The relative slippage increment of the nth node is the ith increment step. Further, th