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Finite Element Analysis and Experimental Research of Actuator Seal Structure

Author: LiMeng
Tutor: ZhaoShuShan
School: Harbin Institute of Technology
Course: Solid Mechanics
Keywords: Assisting sealing structure Seal failure Finite element analysis Pressurepulsation Fault monitoring
CLC: TB42
Type: Master's thesis
Year: 2012
Downloads: 55
Quote: 0
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Abstract


Sealing ring is often used to solve the leakage problems in the system. O-rubber ring is the typical representative of the elastomer compression deformationsealing form. Due to its simple design, stable performance and low cost advantage,o-ring are widely used in hydraulic systems as common seal components. As thebasic seal of components, o-rings are the most vulnerable to be injured in use,which leading to the failure of sealing ring have caught the attention of the relevantdesigners.There are a variety of reasons which give rise to the injuries of o-rubber ring inuse, related to material performance, the assembly process, the structure design andthe working condition and so on. The main fault of servo actuator system is thefailure of sealing ring caused by leakage problems, damage forms varied, such asinterstitial bites, particles and the permanent deformation wear, distortion, etc. Inthis paper, we give an account of the sealing properties of the auxiliary sealingstructure with finite element simulation research under different workingconditions. At the same time, we establish the actuator simulation model, to doresearch into the pulsing characteristics of cavities in the cylinder in which o-ringsexist wear failure.There are a lot of nonlinear contact problems when we do finite elementsimulation for assisting sealing structure. Particularly, the finite element softwareabaqus is suitable for solving such problems. This paper do simulation research intoauxiliary sealing structure of the hydraulic using abaqus, which is under differentworking conditions of the oil pressure, compression rate and the friction coefficient.With compressing of the max Von Mises distribution and max Cpress stressdistribution in the assisting sealing structure as well as the sealing structure without block circle, we get the reason why clearance bite and interface tear occur on therubber ring in the sealing structure without block circle. However, these damageswon’t happen on the o-rings in assisting sealing structure. Meanwhile this is also therationality that we put block circle into the seal structure.When the sealing rings in fort of actuator cylinder column injury, pressurefluctuation characteristics will change in each chamber oil cylinder. In the testanalysis of actuator simulation model, we will simulate different degree of leakageconditions happened in the actuator through replacing the sealing rings by that withdifferent damage degree circle as well as changing combination of the o-rings.Trial, signal of the internal pressure pulsation in each chamber will be collected bythe outside sensors. We will acquire cavity pressure pulsation variationcharacteristics through analyzing the signal. Meanwhile we can let unloading pulsevalue in cavity as a reference in diagnosis analyzing for internal leakage faul tswithin the course of piston propulsion system monitoring.

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CLC: > Industrial Technology > General industrial technology > Industrial common technology and equipment > Sealing technology
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