3D Printed Bracket for Wing Scale Model Pressure Measurement
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Solution Overview
Problem
Existing pressure measuring systems for wind tunnel tests on scale models of elastic wing structures in large transport planes face challenges in achieving perpendicularity between the pipe axis of the pressure measuring pipe and the skin surface, due to the small stiffness and large deformation of the model, making direct installation difficult and affecting measurement accuracy.
Innovation Solution
A pressure measuring device with a bracket system made of photosensitive resin, integrally formed by 3D printing, which includes semi-cylindrical convex structures and a truss structure to support the pressure measuring steel pipe, ensuring accurate perpendicularity and ease of installation, while minimizing additional mass and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direct installation of piezometer tube is used on elastic similar structure model, then installation simplicity is improved, but measurement precision deteriorates due to inability to achieve required perpendicularity
Solution Approach 1:
The patent introduces a bracket as an intermediary component between the skin and the pressure measuring steel pipe. The bracket includes a holding block that clamps the pipe and a supporting plate that bonds to the skin, allowing the pipe to be positioned perpendicular to the skin surface without requiring direct installation. This mediator structure enables both ease of installation and measurement precision.
Solution Approach 2:
The pressure measuring system is segmented into multiple components: the bracket (with supporting plate and holding block), the pressure measuring steel pipe, and the bonding agents. This segmentation allows each component to perform its specific function - the bracket provides positioning and support, the pipe conducts pressure measurements, and the bonding agents ensure secure attachment - thereby achieving both installation simplicity and measurement accuracy.
2Strength
If traditional pressure measuring system is used, then structural support is improved, but device complexity increases and additional mass and stiffness are added to the model
Solution Approach 1:
The bracket is designed with local quality differentiation: the supporting plate provides bonding surface area for structural support, while the holding block provides localized clamping force on the pipe. The outer wall is thin-walled (1mm thickness) to minimize mass, while the inner truss structure provides necessary structural support. This local quality approach reduces overall device complexity and mass while maintaining required strength.
Solution Approach 2:
The outer wall of the bracket is designed as a thin-walled structure with 1mm thickness, which minimizes the additional mass and stiffness added to the elastic similar structure model. The thin-walled design, combined with the inner truss support structure, provides sufficient structural support while keeping the device simple and lightweight.
3Weight of stationary object
If bracket with thin-walled structure is used, then additional mass and stiffness are reduced, but manufacturing precision requirements increase to maintain perpendicularity
Solution Approach 1:
The bracket is pre-formed with the holding block and supporting plate in fixed spatial relationships during 3D printing. The pipe groove and holding block are designed with predetermined geometries that guide the pressure measuring steel pipe into the correct perpendicular position before bonding. This preliminary action ensures manufacturing precision is achieved through design rather than post-assembly adjustment.
Solution Approach 2:
The patent specifies precise geometric parameters: the holding block has a clamping force of 0.5-1.0N, the pipe groove has specific dimensions, and the supporting plate has a bonding area of at least 10mm×10mm. These parameter specifications ensure that the thin-walled bracket can maintain perpendicularity accuracy (within ±1 degree) while minimizing mass and stiffness additions to the model.
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
The solution ensures accurate pressure measurement results by maintaining the required perpendicularity between the pressure measuring pipe and the skin surface, facilitating simultaneous measurement on both surfaces and simplifying the installation process without adding significant mass or stiffness to the model.
Implementation Method 1
an upper surface and a lower surface of the bracket for pressure measuring steel pipes are attached to the skin and are bonded to the skin and the wing beams by resin adhesive
Data Source
AI summary
A pressure measuring device for a scale model for elastic similar structure of a wing in a large transport plane adopts a bracket for pressure measuring steel pipes formed by 3D printing, shapes of an upper surface and an lower surface of the bracket are completely the same as local airfoile profiles of a skin at required pressure measuring positions, and the upper surface and the lower surface of the bracket are bonded to the skin and wing beams; a pressure measuring hose is connected with the pressure measuring steel pipe, and the pressure measuring steel pipe is embedded into the bracket and fixed to it; the upper surface and the lower surface of the bracket are provided with semi-cylindrical convex structures; and the pressure measuring steel pipe extends out of the pressure measuring hole in the surface of the skin for pressure measuring steel pipe in the bracket.