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Life prediction method and system for rubber and plastic shaft seals based on finite element wear degradation analysis

A technology of life prediction and finite element, which is applied in design optimization/simulation, instrumentation, calculation, etc., can solve the problems of high cost and low accuracy, and achieve the goal of reducing prediction cost, improving accuracy, and saving manpower and material resources Effect

Active Publication Date: 2021-06-04
BEIHANG UNIV
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  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a rubber and plastic shaft seal life prediction method and system based on finite element wear degradation analysis to solve the problems of low accuracy and high cost of existing rubber and plastic shaft seal life prediction methods

Method used

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  • Life prediction method and system for rubber and plastic shaft seals based on finite element wear degradation analysis
  • Life prediction method and system for rubber and plastic shaft seals based on finite element wear degradation analysis
  • Life prediction method and system for rubber and plastic shaft seals based on finite element wear degradation analysis

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Embodiment

[0184] In the embodiment of the present invention, a three-dimensional modeling of a certain type of rubber and plastic shaft seal is carried out, and the appearance of the three-dimensional model is as follows Figure 8 shown. At the same time, the two-dimensional profile of the actual surface was measured by a roughness profiler. The two-dimensional profile curve is as follows: Figure 9 As shown, the abscissa is the axial sampling length, and the ordinate is the height of the two-dimensional profile. And based on previous tests and expert experience, the relevant failure thresholds of friction torque and pumping rate under specific working conditions were obtained. The working conditions and failure thresholds are shown in Table 1:

[0185] Table 1 Test profile and failure threshold under this profile

[0186]

[0187]

[0188] According to the method of the present invention, the simulation time step is set to be 1 hour, and finally the degradation curve of its pum...

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Abstract

The invention discloses a method and system for predicting the life of a rubber-plastic shaft seal based on finite element wear degradation analysis. The method adopts the finite element method to carry out physical modeling of wear and tear degradation, obtains the two-dimensional model of the sealing lip of the rubber-plastic shaft seal, and according to the two-dimensional model and the three-dimensional shape of the sealing lip of the rubber-plastic shaft seal The transient performance parameters are obtained by simulation, and the friction torque and pumping rate are used as the failure judgment conditions of the rubber and plastic shaft seal. When the friction torque or pumping rate reaches the failure threshold, the simulation iteration is stopped, and the rubber is calculated according to the simulation time step and the current simulation times. The theoretical life of the plastic shaft seal improves the accuracy of life prediction of the rubber and plastic shaft seal; and the method of the invention does not need to carry out an accelerated life test, which saves a lot of manpower and material resources and reduces the life prediction cost of the rubber and plastic shaft seal.

Description

technical field [0001] The invention relates to the technical field of rubber and plastic shaft seals, in particular to a method and system for predicting the life of rubber and plastic shaft seals based on finite element wear degradation analysis. Background technique [0002] Rubber and plastic shaft seals are also called oil seals. They are mainly composed of metal skeleton, fastening spring and sealing lip. As a common dynamic seal, they are widely used in gear pumps and fuel pumps. Its main features are simple structure, low price and long life. Under working conditions, the failure modes of rubber and plastic shaft seals include: material aging and hardening, spring failure and lip friction and wear. The most important failure mechanism is the friction and wear degradation of the sealing lip. The failure of the rubber and plastic shaft seal directly leads to a large amount of oil leakage, which will not only pollute the environment in the working chamber, but more ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F119/02G06F119/04G06F119/14
Inventor 张超王少萍陈启航刘迪
Owner BEIHANG UNIV
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