Thickness Model of the Adhesive on Spacecraft Structural Plate
This paper establishes a physical model for the non-contact rotary screen coating process based on a spacecraft structural plate and proposes a theoretical expression for the adhesive thickness of the non-contact rotary screen coating. The thickness of the adhesive is a critical factor influencing t...
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| Format: | Article |
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MDPI AG
2025-02-01
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| Series: | Aerospace |
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| Online Access: | https://www.mdpi.com/2226-4310/12/2/159 |
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| author | Yanhui Guo Peibo Li Yanpeng Chen Xinfu Chi Yize Sun |
| author_facet | Yanhui Guo Peibo Li Yanpeng Chen Xinfu Chi Yize Sun |
| author_sort | Yanhui Guo |
| collection | DOAJ |
| description | This paper establishes a physical model for the non-contact rotary screen coating process based on a spacecraft structural plate and proposes a theoretical expression for the adhesive thickness of the non-contact rotary screen coating. The thickness of the adhesive is a critical factor influencing the quality of the optical solar reflector (OSR) adhesion. The thickness of the adhesive layer depends on the equivalent fluid height and the ratio of the fluid flow rate to the squeegee speed below the squeegee. When the screen and fluid remain constant, the fluid flow rate below the squeegee depends on the pressure at the tip of the squeegee. The pressure is also a function related to the deformation characteristics and speed of the squeegee. Based on the actual geometric shape of the wedge-shaped squeegee, the analytical expression for the vertical displacement of the squeegee is obtained as the actual boundary of the flow field. The analytical expression for the deformation angle of the squeegee is used to solve the contact length between the squeegee and the rotary screen. It reduces the calculation difficulty compared with the previous method. Based on the theory of rheology and fluid mechanics, the velocity distribution of the fluid under the squeegee and the expression of the dynamic pressure at the tip of the squeegee were obtained. The dynamic pressure at the tip of the squeegee is a key factor for the adhesive to pass through the rotary screen. According to the continuity equation of the fluid, the theoretical thickness expression of the non-contact rotary screen coating is obtained. The simulation and experimental results show that the variation trend of coating thickness with the influence of variables is consistent. Experimental and simulation errors compared to theoretical values are less than 5%, which proves the rationality of the theoretical expression of the non-contact rotary screen coating thickness under the condition of considering the actual squeegee deformation. The existence of differences proves that a small part of the colloid remains on the rotary screen during the colloid transfer process. The expression parameterizes the rotary screen coating model and provides a theoretical basis for the design of automatic coating equipment. |
| format | Article |
| id | doaj-art-2bed47bb2b274dbca964e31237cc1ed2 |
| institution | DOAJ |
| issn | 2226-4310 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Aerospace |
| spelling | doaj-art-2bed47bb2b274dbca964e31237cc1ed22025-08-20T03:11:07ZengMDPI AGAerospace2226-43102025-02-0112215910.3390/aerospace12020159Thickness Model of the Adhesive on Spacecraft Structural PlateYanhui Guo0Peibo Li1Yanpeng Chen2Xinfu Chi3Yize Sun4College of Mechanical Engineering, Donghua University, Shanghai 201620, ChinaShanghai Institute of Spacecraft Equipment, Shanghai 200240, ChinaCollege of Mechanical Engineering, Donghua University, Shanghai 201620, ChinaCollege of Mechanical Engineering, Donghua University, Shanghai 201620, ChinaCollege of Mechanical Engineering, Donghua University, Shanghai 201620, ChinaThis paper establishes a physical model for the non-contact rotary screen coating process based on a spacecraft structural plate and proposes a theoretical expression for the adhesive thickness of the non-contact rotary screen coating. The thickness of the adhesive is a critical factor influencing the quality of the optical solar reflector (OSR) adhesion. The thickness of the adhesive layer depends on the equivalent fluid height and the ratio of the fluid flow rate to the squeegee speed below the squeegee. When the screen and fluid remain constant, the fluid flow rate below the squeegee depends on the pressure at the tip of the squeegee. The pressure is also a function related to the deformation characteristics and speed of the squeegee. Based on the actual geometric shape of the wedge-shaped squeegee, the analytical expression for the vertical displacement of the squeegee is obtained as the actual boundary of the flow field. The analytical expression for the deformation angle of the squeegee is used to solve the contact length between the squeegee and the rotary screen. It reduces the calculation difficulty compared with the previous method. Based on the theory of rheology and fluid mechanics, the velocity distribution of the fluid under the squeegee and the expression of the dynamic pressure at the tip of the squeegee were obtained. The dynamic pressure at the tip of the squeegee is a key factor for the adhesive to pass through the rotary screen. According to the continuity equation of the fluid, the theoretical thickness expression of the non-contact rotary screen coating is obtained. The simulation and experimental results show that the variation trend of coating thickness with the influence of variables is consistent. Experimental and simulation errors compared to theoretical values are less than 5%, which proves the rationality of the theoretical expression of the non-contact rotary screen coating thickness under the condition of considering the actual squeegee deformation. The existence of differences proves that a small part of the colloid remains on the rotary screen during the colloid transfer process. The expression parameterizes the rotary screen coating model and provides a theoretical basis for the design of automatic coating equipment.https://www.mdpi.com/2226-4310/12/2/159thickness modelrotary screen printingvariable cross-section cantilever beamspacecraft structural platesoptical solar reflector |
| spellingShingle | Yanhui Guo Peibo Li Yanpeng Chen Xinfu Chi Yize Sun Thickness Model of the Adhesive on Spacecraft Structural Plate Aerospace thickness model rotary screen printing variable cross-section cantilever beam spacecraft structural plates optical solar reflector |
| title | Thickness Model of the Adhesive on Spacecraft Structural Plate |
| title_full | Thickness Model of the Adhesive on Spacecraft Structural Plate |
| title_fullStr | Thickness Model of the Adhesive on Spacecraft Structural Plate |
| title_full_unstemmed | Thickness Model of the Adhesive on Spacecraft Structural Plate |
| title_short | Thickness Model of the Adhesive on Spacecraft Structural Plate |
| title_sort | thickness model of the adhesive on spacecraft structural plate |
| topic | thickness model rotary screen printing variable cross-section cantilever beam spacecraft structural plates optical solar reflector |
| url | https://www.mdpi.com/2226-4310/12/2/159 |
| work_keys_str_mv | AT yanhuiguo thicknessmodeloftheadhesiveonspacecraftstructuralplate AT peiboli thicknessmodeloftheadhesiveonspacecraftstructuralplate AT yanpengchen thicknessmodeloftheadhesiveonspacecraftstructuralplate AT xinfuchi thicknessmodeloftheadhesiveonspacecraftstructuralplate AT yizesun thicknessmodeloftheadhesiveonspacecraftstructuralplate |