Bi-Stable Valve Array for Precise Composite Ply Adhesion
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Solution Overview
Problem
Current systems for handling composite plies in aircraft manufacturing face challenges due to the lack of stiffness in non-fiber directions, difficulty in controlling ply adhesion, and the need for bulky pneumatic valve systems, which hinder efficient and precise material handling, especially when dealing with less stiff materials like unidirectional fiber composites.
Innovation Solution
An automated bi-stable valve system with a control mechanism that allows multiple valves to be controlled by one system, featuring a bi-stable valve mechanism with a traversable bridge apparatus and a valve switch mechanism, enabling precise control of adhesion zones and higher valve densities, reducing size, mass, and weight compared to traditional systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional pneumatic valves are used for controlling adhesion zones, then the system can handle composite plies, but the valve system becomes bulky and heavy, reducing valve density
Solution Approach 1:
The valve system is divided into multiple independent mini-valves arranged in an array, each controlling a specific adhesion zone. This segmentation allows for high valve density while keeping each individual valve small and lightweight, resolving the contradiction between valve density and system weight
Solution Approach 2:
Each mini-valve is designed with localized control capability, allowing adhesion to be applied selectively to specific zones on the gripper surface. This local quality enables precise control of individual adhesion zones without requiring a bulky centralized valve system
2Ease of operation
If multiple individually controlled pneumatic valves are used, then adhesion control is possible, but the system complexity and weight increase
Solution Approach 1:
Multiple mini-valves are integrated into a single unified valve system with shared control mechanisms. The merging of valve bodies and control electronics reduces overall system complexity while maintaining the ability to control each adhesion zone independently through electronic addressing
3Use of energy by moving object
If area vacuum grippers with passive check valves are used, then vacuum flow is unrestricted, but discrete control of adhesion zones is lost
Solution Approach 1:
The gripper surface is segmented into multiple independently controllable adhesion zones, each with its own mini-valve. This segmentation enables selective activation of specific zones while maintaining unrestricted vacuum flow to active zones, resolving the contradiction between flow efficiency and zone selectivity
4Ease of operation
If ply adhesion is applied to pick up composite plies, then material handling is enabled, but control over adhesion placement precision is difficult
Solution Approach 1:
The valve system provides localized control over adhesion zones with precise spatial positioning. Each mini-valve corresponds to a specific location on the gripper surface, enabling precise control over where adhesion is applied to the composite plies, thereby improving manufacturing precision
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 automated bi-stable valve system enables efficient and precise handling of composite plies by providing fine control over adhesion, allowing for higher valve densities and reducing the risk of disturbing adjacent plies, thus improving the efficiency and accuracy of material handling in composite manufacturing.
Implementation Method 1
Pneumatic valves are typically used in industrial applications where the on/off flow of air, such as compressed air, is controlled. However, because such pneumatic valves are optimized for compressed air, they may not be suitable for pulling vacuum.
Implementation Method 2
the valve switch mechanism is configured to switch one or more of the plurality of bi-stable valves between the valve closed state and the valve open state
Data Source
AI summary
There is provided an automated bi-stable valve system. The system includes a bi-stable valve mechanism with bi-stable valves. Each of the bi-stable valves is configured to switch between a valve closed state and a valve open state. The system includes a control system coupled to the bi-stable valve mechanism and configured to operably control the bi-stable valve mechanism. The control system includes, (i) at least one traversable bridge apparatus, and (ii) a valve switch mechanism attached to the traversable bridge apparatus, and movable, via the traversable bridge apparatus, over the bi-stable valves. The valve switch mechanism is configured to switch the bi-stable valve(s) between the valve closed state and the valve open state, to allow for selective control of one or more adhesion zones on the bi-stable valve mechanism. The adhesion zone(s) correspond to adhesion area(s) on a surface of a material to be selectively picked up and placed.