Aircraft Load Release Pantograph with Synchronized Linkages
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Solution Overview
Problem
Existing load release systems for aircraft face challenges in managing loads within confined spaces, particularly during ground handling and flight ejection, with risks of interference with aircraft edges and aerodynamic turbulence, and lack clear guidance on load handling and maintenance.
Innovation Solution
A device featuring an extendable pantograph with synchronized linkage assemblies, an intermediate cradle, and dual actuators – a pyrotechnic trigger cylinder and a hydraulic secondary piston – to ensure precise load guidance and handling, including automatic ground manipulation and efficient ejection with reduced risk of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pantograph assembly is used for load ejection, then the device complexity is reduced, but the load guidance precision and system rigidity deteriorate due to aerodynamic disturbances and potential interference with aircraft edges
Solution Approach 1:
The pantograph system is divided into two independent but synchronized connecting rod assemblies mounted in parallel. Each assembly independently supports and guides the load, providing redundant guidance paths that maintain precision even under aerodynamic disturbances. The segmentation allows each assembly to be optimized for its specific function while collectively achieving superior load control.
Solution Approach 2:
Two connecting rod assemblies are combined in a parallel configuration to work together as a unified load guidance system. The assemblies are synchronized through shared mounting structures and coordinated actuation, merging their individual capabilities to achieve enhanced load guidance precision and system rigidity that neither assembly could provide alone.
2Ease of operation
If the pantograph is designed for automatic ground handling, then the ease of operation is improved, but the device complexity increases due to additional actuators and control mechanisms
Solution Approach 1:
The connecting rod assemblies are designed to perform multiple functions: they provide structural support during ground handling, guide the load during ejection, and enable automatic positioning through their synchronized movement. This multi-functionality eliminates the need for separate ground handling mechanisms, achieving automatic operation without proportionally increasing complexity.
Solution Approach 2:
The pantograph system uses its own structural components and actuators to perform ground handling operations without requiring external equipment or manual intervention. The synchronized connecting rod assemblies automatically position and secure the load during ground operations, making the system self-sufficient for both ground and flight phase operations.
3Adaptability or versatility
If the load is ejected from a hold, then the adaptability to new aircraft configurations is improved, but the risk of load interference with aircraft edges increases due to aerodynamic turbulence
Solution Approach 1:
The pantograph system transitions dynamically from a compact folded configuration during hold containment to an extended guidance configuration during ejection. The connecting rod assemblies adjust their geometry and positioning in real-time to accommodate aerodynamic forces, maintaining load guidance precision throughout the ejection process despite turbulent conditions.
Solution Approach 2:
The intermediate cradle serves as a mediator between the load and the pantograph assemblies during ejection. It provides a stable mounting point that isolates the load from direct aerodynamic disturbances while the connecting rod assemblies guide the cradle-LAD combination away from aircraft edges, reducing interference risks.
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 provides reliable, automatic load handling and ejection with enhanced system rigidity, minimizing the risk of load interference and facilitating easy maintenance by utilizing synchronized linkage assemblies and dual actuators for controlled load release and ground operations.
Implementation Method 1
the trigger cylinder comprises at least two pyrotechnic impellers causing the linear displacement of the sliding carriages
Implementation Method 2
the secondary piston is of the double-acting type, for example hydraulic
Data Source
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AI summary
The present invention relates to a device (1) for releasing a load (5) attached under an aircraft (2) comprising an extendable load release system in the form of a pantograph (20) capable of assuming a first folded position for retaining the load (5) and a second deployed position for installing the load (5) on the ground or releasing it in flight by pushing it away from the aircraft (2) by means of a downward vertical thrust, said release pantograph (20) comprising at least two pairs of articulated connecting rods (25, 26) connected to each other by means of fixed (22) and movable (21, 23, 24) pivots forming a connecting rod assembly, - a pantograph (20) triggering cylinder (40) provided with a cylinder rod (42) to which are connected two movable upper pivots (21) of said release pantograph (20),characterized in that it further comprises an intermediate cradle (30) for supporting the load (5) and in that the release pantograph (20) comprises two identical connecting rod assemblies (20a, 20b) mounted in parallel along the cradle (30) and operating in perfect synchronization for the transition from one position to the other.