Simulator for Paint Film Thickness Fluctuation Analysis
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Solution Overview
Problem
Current simulators fail to accurately simulate the fluctuation in film thickness after paint application on a workpiece, neglecting the viscosity of the paint.
Innovation Solution
A simulator that includes units to acquire fluid properties, calculate the maximum film thickness, and determine moving amounts based on fluid properties and mesh inclinations, simulating the movement of paint considering gravity and surface tension effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If paint application simulation is performed using conventional methods, then the basic film thickness can be calculated, but the fluctuation in film thickness after application cannot be simulated
Solution Approach 1:
The patent applies parameter changes by incorporating fluid property parameters (viscosity, surface tension) and environmental parameters (drying time, inclination angle) into the simulation model. These parameters dynamically affect the film thickness calculation, allowing the system to simulate post-application fluctuations by adjusting the governing equations based on varying conditions rather than using fixed conventional parameters.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and storing the relationship between fluid properties, inclination angles, and maximum film thickness in lookup tables or pre-computed data structures. This allows the simulation to quickly access pre-determined characteristics without performing complex real-time calculations during the main simulation process, thereby improving precision while managing computational complexity.
2Manufacturing precision
If viscosity of paint is not considered, then the simulation is simpler, but the fluctuation in film thickness cannot be accurately simulated
Solution Approach 1:
The patent incorporates viscosity as a dynamic parameter that changes the simulation behavior. By integrating viscosity into the governing equations, the model can predict how paint flows and redistributes on inclined surfaces, capturing the fluctuation in film thickness that occurs after application. This transforms the simulation from a static geometric calculation to a dynamic fluid behavior model.
Solution Approach 2:
The patent segments the simulation into distinct computational stages: initial paint application, fluid flow phase (governed by viscosity and inclination), and final film thickness determination. This segmentation allows the complex viscosity-driven flow process to be handled in a dedicated computational module, improving manufacturing precision while containing the complexity within specific simulation stages rather than the entire process.
3Reliability
If maximum film thickness is not calculated based on inclination and fluid properties, then the simulation is faster, but the movement of fluid due to gravity cannot be predicted
Solution Approach 1:
The patent performs preliminary action by pre-calculating the maximum film thickness for various combinations of inclination angles and fluid properties, storing these results in lookup tables. During the actual simulation, the system quickly retrieves pre-computed values rather than performing complex real-time calculations, thereby maintaining high reliability in fluid movement prediction while preserving computational speed and productivity.
Solution Approach 2:
The patent applies equipotentiality by establishing a reference framework where the maximum film thickness is determined by the balance between gravitational force (dependent on inclination) and fluid properties. This creates a stable reference state against which actual film thickness can be compared, allowing the simulation to efficiently predict fluid movement without requiring continuous complex recalculations, thus improving both reliability and computational efficiency.
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
Enables accurate simulation of film thickness fluctuations post-paint application, accounting for paint viscosity, gravity, and surface tension, providing detailed simulation results.
Implementation Method 1
a maximum film thickness calculation unit that calculates, for each mesh, a maximum film thickness of the fluid that can be held in the mesh, from an inclination of the mesh with respect to a gravity direction and the property of the fluid
Implementation Method 2
a first moving amount calculation unit that calculates, for each mesh, a first moving amount in a case where a film thickness of the applied fluid is larger than the maximum film thickness of the fluid that can be held in the mesh, the first moving amount being an amount which is determined by the property of the fluid and by which the fluid moves to a mesh located at a position lower than the mesh among meshes adjacent to the mesh
Data Source
AI summary
A simulator comprises a fluid property acquiring unit for acquiring the properties of a fluid to be discharged; a mesh division unit for dividing the surface of a CAD model for a workpiece into meshes; an application amount calculation unit for calculating the amount of the fluid applied to each mesh; a maximum film thickness calculation unit for calculating the maximum film thickness of the fluid that each mesh can hold; and a first moving amount calculation unit for calculating, for each mesh, a first moving amount by which the fluid in an amount determined by the properties of the fluid moves relative to the mesh located at a position lower than said each mesh among the meshes adjacent to said each mesh when the film thickness of the applied fluid is larger than the maximum film thickness of the fluid that each mesh can hold.