2024 Stick-slip motion of turbine blade dampers

Stick-slip motion of turbine blade dampers

Author: tqbq

August undefined, 2024

WebXia proposed a model for investigating the stick-slip motion caused by dry friction of a two-dimensional oscillator under arbitrary excitations and provided a numerical approach to investigate the system with the Coulomb friction law. ... adding a platform damper will make the turbine blade’s vibration reduce obviously. When the steady-state ... WebApr 25, 2024 · In this study, a more advanced set-up based on a high speed camera together with digital image correlation (DIC) will be used to obtain a more complete and detailed …

Stick-slip motion of turbine blade dampers

WebA common damper configuration is the so-called under-platform dry fricti on damper in the form of a small piece of metal device located underneath the blade platform and actuated … WebA numerical approach for solving the steady-state vibration of a simplified blade-damper system with nonsmooth friction contact is put forward and three distinct types of vibration, including stick-slip vibration between the two dampers … 卒業式コーデママ

Characterization of Contact Kinematics and Application to the

WebMar 16, 1992 · They are positioned loosely between the roots of turbine blades improving the damping of blade vibrations by generating dry friction from the relative motion of blades and damper. This paper presents a theoretical approach to these stick-slip vibrations and … WebA numerical approach for solving the steady-state vibration of a simpliﬁed blade-damper system with nonsmooth friction contact is put forward and three distinct types of … WebJan 28, 2024 · Gastaldi, C., Gola, M.M.: On the relevance of a micro-slip contact model for under-platform dampers. Int. J. Mech. Sci. 115, 145–156 (2016) CrossRef Google Scholar … 卒業式コーデ母親

Robust design optimisation of underplatform dampers for turbine ...

Design of a Multi-Robot System for Wind Turbine Maintenance

Webdamper blades. Smoke dampers are motorized and are usually triggered by a ﬁ re alarm or detector. Keeping a Facility Code Compliant The Joint Commission reviews the … WebDec 24, 2014 · Friction dampers are often used in turbine design to attenuate blade vibration to acceptable levels so as to prolong blades’ service life. A wedge damper, also called a self-centering blade-to-blade damper, can provide more design flexibility to meet various needs in different operating conditions when compared with conventional platform dampers. 卒業式コーデ女の子WebAug 22, 1991 · 4. CONCLUSIONS The friction damper is used widely in industry to minimize the response of turbine blades. Experimental results [9, 10] have indicated that the dynamic friction coefficient is dependent on the sliding velocity of the contact surfaces, especially when stick-slip motion occurs. basio4 メール着信音設定

"WebOct 7, 2024 · In this paper, a comparative analysis of the nonlinear characteristics and the vibration reduction characteristics of shrouded blades based on the two typical macro … " - Stick-slip motion of turbine blade dampers

Stick-slip motion of turbine blade dampers

Dynamic Response of a Simplified Turbine Blade …

WebMar 30, 2012 · A preliminary static analysis of the contact is performed in order to compute the static pressure distribution over the damper/blade interfaces, assuming that it does … WebFeb 1, 2006 · Stick-Slip Motion of Turbine Blade Dampers ,” Philos. Trans. R. Soc. London, Ser. A 0962-8428, 338 , pp. 503 – 517 . 6. Pierre , C. , Ferri , A. A. , and Dowel , E. H. , 1985, “ …

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WebJul 6, 2024 · The motion of the damper is not harmonic but periodic whose period is the period of the excitation in gross slip regime and stick–slip regime, but is quasi-periodic in pure stick regime. During slip and stick–slip schemes, the odd-order superharmonic components of the driving frequency emerge because the friction force is periodic at the ... WebDuring operation mechanical structures can experience large vibration amplitudes. One of the challenges encountered in gas-turbine blade design is avoiding high-cycle fatigue failure usually caused by large resonance stresses driven by aeroelastic excitation. A common approach to control the amplitude levels relies on increasing friction damping by …

WebMar 15, 1992 · Turbine blade dampers are small elements of a parabolic configuration usually fabricated from sheet steel. They are positioned loosely between the roots of … WebApr 1, 2015 · The vertical motion of the dampers leads to time-varying contact forces and can cause horizontal stick-slip motion between the contact surfaces. Due to the relative horizontal motion...

WebJun 6, 2024 · Thus, the damper’s motion between blade platform locations could be determined by iteration of force balance equations of the damper once the blades’ motions as inputs of the system were determined. The effect of normal load on the contact stiffness was ignored for simplicity. WebJan 1, 2008 · Stick-Slip Motion of Turbine Blade Dampers. Article. Mar 1992; PHILOS T R SOC A; Friedrich Pfeiffer; Manfred Hajek; Turbine blade dampers are small elements of a parabolic configuration usually ...

WebMar 30, 2012 · A common type of blade-to-blade friction dampers are the so-called underplatform dampers (UPDs); these are metal devices placed under the blade platforms and held in contact with them by the centrifugal force acting during rotation.

WebOct 1, 2024 · Sanlitürk et al. used an Iwan model capable of reproducing the micro-slip behavior and analyzed the dynamic characteristics of wedge dampers for turbine blades using a combination of harmonic balance method and structural modification approaches [16]. 卒業式コーデ男の子WebMar 3, 2024 · 1. Introduction. The optimisation of underplatform dampers (UPD) has been receiving growing interest in recent publications, see Ref. [1, 2].The UPD is an established passive friction device that mitigates the threat of high-cycle fatigue for gas turbine blades due to large resonance stresses [3].This is achieved by reducing the resonance amplitude … 卒業式イラスト簡単WebDec 8, 2024 · 1. Introduction. One of the most common causes of failure for gas turbines is high-cycle fatigue (HCF) driven by large resonant stresses [1].Underplatform dampers are devices used by aeroengine manufacturers to reduce the risk of HCF failure, since they dissipate the vibrational energy while at the same time acting as a seal between blades to … 卒業式コーデ母WebSep 20, 2024 · This survey provides an insight into the modeling and testing of uniaxial friction dampers. The focus is on attenuating the linear relative movement along planar surfaces for frequencies between 10 Hz and 1 kHz. An overview of the different approaches seen in the literature concerning friction damping is provided. basio4 ライト点滅消えないWebresponse analysis of turbine blades [13,14]. Most of the commercially-used dampers are more complex than the bar-shaped underplatform dampers. Pfeiffer and Hajek [15] proposed a method to analyse stick-slip vibrations in general and studied a curved wedged damper for turbine blades. The behaviour of 卒業式コート母 50代WebFeb 5, 2024 · It’s going to get worse: Most were built more than a decade ago, when installations were less than a fifth of what they are now. Built to withstand hurricane-force … 卒業式コート母 40代WebThe absolute motion of the blade consists of rigid body rotation and vibration relative to the bladed disc. It is assumed that the rigid damper is mounted on an elastic beam and that there is no friction between the damper and the elastic beam. 卒業式コートコーデ