Floating Bushing Oil Film Analysis for Transient Lubrication Faults
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Solution Overview
Problem
The existing lubrication analysis methods for diesel engine oil supply mechanisms with roller-floating bushing structures fail to accurately identify transient lubrication abnormalities, leading to reliability issues due to abnormal locking and wear, which affects the overall performance and life of the engine.
Innovation Solution
A double-layer oil film lubrication analysis method and system that determines the inner and outer oil film thickness, roller and bushing displacement, and motion tracks, using Reynolds-averaged Navier-Stokes equations and elastic deformation calculations to identify abnormalities in oil film thickness, thereby providing a more accurate assessment of the lubrication state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a roller-floating bushing-roller pin structure is used to form double-layer oil film lubrication, then bearing capacity increases and friction temperature rise decreases, but lubrication abnormalities such as abnormal locking and wear occur affecting reliability
Solution Approach 1:
The patent applies parameter changes by transitioning from static lubrication analysis to transient lubrication analysis that accounts for time-varying parameters including rotating speed, load, and oil film thickness. The Reynolds-averaged Navier-Stokes equations are solved with time-dependent boundary conditions to capture the dynamic behavior of the double-layer oil film, enabling accurate prediction of lubrication state under varying operating conditions and preventing abnormal locking and wear.
2Device complexity
If traditional lubrication analysis methods are used for roller-floating bushing structures, then analysis simplicity is maintained, but accuracy in identifying transient lubrication abnormalities is insufficient
Solution Approach 1:
The patent replaces traditional mechanical lubrication analysis methods with a computational fluid dynamics approach based on Reynolds-averaged Navier-Stokes equations. This substitution enables accurate modeling of the transient behavior of the double-layer oil film by solving the full Navier-Stokes equations with appropriate boundary conditions, capturing complex fluid dynamics that traditional methods cannot predict, thereby significantly improving identification accuracy of lubrication abnormalities.
3Device complexity
If stable working condition assumptions are made for lubrication analysis, then analysis complexity is reduced, but transient lubrication abnormalities cannot be accurately identified
Solution Approach 1:
The patent applies dynamics by formulating a transient lubrication model where all parameters are time-dependent. The analysis captures the dynamic interaction between the roller, floating bushing, and roller pin by solving the Reynolds-averaged Navier-Stokes equations with time-varying boundary conditions. This dynamic approach accurately identifies transient lubrication abnormalities that occur during startup, shutdown, and load variations,而不能 be detected by static analysis methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for real-time abnormality analysis and improved accuracy in determining the double-layer oil film lubrication state, enhancing the reliability and performance of diesel engine oil supply mechanisms by considering thermo-elastic deformations and mixed lubrication effects.
Implementation Method 1
Reynolds-averaged Navier-Stokes (RANS) equations of the inner-layer and outer-layer oil films are solved according to the time-varying rotating speed of the roller
Implementation Method 2
an inner-layer elastic deformation and an outer-layer elastic deformation of the floating bushing are determined according to the inner-layer oil film pressure and the outer-layer oil film pressure
Data Source
AI summary
Disclosed is a double-layer oil film lubrication analysis method and system based on a floating bushing. The method includes: determining a roller motion track and a floating bushing motion track according to a roller displacement and a floating bushing displacement; determining, when the motion tracks are closed end to end, minimum values of inner-layer and outer-layer oil film thickness of the floating bushing according to an oil film thickness at each moment; and determining that an abnormality exists in double-layer oil film lubrication when either of the minimum values of the inner-layer and outer-layer oil film thickness of the floating bushing is less than a preset oil film thickness threshold value. According to the present disclosure, more accurate abnormality analysis of double-layer oil film lubrication can be realized.