Payload Ejection Mechanism for Launch Capsule Shock Absorption
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Solution Overview
Problem
Launch capsules face challenges in deploying payloads safely due to axial shock during launch and the risk of debris damage, particularly during low-speed deployments where aerodynamic forces are diminished, potentially damaging the payload or preventing safe wing deployment.
Innovation Solution
A combined shock absorption and payload ejection mechanism within the launch capsule, comprising a movable housing with an energy-storing resilient member and a damping system, which compresses and stores energy during launch, then rapidly propels the payload forward upon capsule opening, increasing separation distance and reducing shock exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shock isolation system is used to protect the payload from axial shock during launch, then the payload can withstand launch acceleration, but the payload remains exposed to debris and cannot rapidly separate from the capsule
Solution Approach 1:
The patent combines the shock isolation system and payload ejection mechanism into a single integrated apparatus. The movable housing contains both the resilient member for shock absorption and the piston-cylinder damping system for controlled ejection. This merging allows the payload to be protected during launch while simultaneously enabling rapid separation from the capsule to avoid debris damage.
Solution Approach 2:
The resilient member is pre-compressed during launch to store energy, and the locking mechanism is pre-positioned to engage with the piston. When deployment is initiated, the locking mechanism releases, allowing the pre-compressed spring to rapidly expand and eject the payload. This preliminary preparation enables fast payload ejection without requiring complex active actuation systems.
2Speed
If explosive bolts are used to open the capsule for payload deployment, then the capsule can open quickly, but debris is produced that can damage the payload
Solution Approach 1:
The payload ejection mechanism acts as an intermediary between capsule opening and payload separation. Instead of relying solely on capsule opening to achieve separation, the mechanism uses the pre-compressed resilient member to actively propel the payload forward once the capsule opens. This intermediary action ensures rapid separation without requiring high-speed capsule opening, thereby reducing debris production while maintaining deployment speed.
3Device complexity
If aerodynamic forces are relied upon to brake the capsule and separate the payload, then no additional mechanism is needed, but separation is insufficient during low-speed deployments
Solution Approach 1:
The integrated mechanism serves multiple functions: it provides shock isolation during launch, stores energy in the resilient member, dampens the ejection motion through the piston-cylinder system, and actively propels the payload forward. This multi-functionality allows the apparatus to achieve rapid payload separation in both high-speed and low-speed deployment scenarios, overcoming the limitation of relying solely on aerodynamic forces.
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 mechanism effectively reduces the risk of payload damage by absorbing launch shock and enhancing separation speed, ensuring safer and more efficient deployment, especially in low-speed scenarios where aerodynamic forces are limited.
Implementation Method 1
the energy-storing element is a resilient member, such as a coil spring... the downward movement of the movable housing compresses the resilient member and results in further insertion of the piston into the cylinder. The former action stores energy (as potential energy in the compressed spring)
Implementation Method 2
A damping system that includes a piston and cylinder is also at least partially housed within the movable housing... the downward movement of the movable housing compresses the resilient member and results in further insertion of the piston into the cylinder. The latter action results in damping that provides shock isolation for the payload
Data Source
AI summary
An apparatus that provides shock absorption and ejection for a payload that is to be deployed from a launch capsule is disclosed. The payload ejection mechanism comprises a movable housing that houses a resilient member and a shock-damping system. The rapid acceleration of the capsule upon launch causes the movable housing to move, which compresses the resilient member, thereby storing energy. Movement of the housing also provides shock damping behavior. A locking mechanism maintains the compression of the resilient member until the capsule opens to deploy the payload. As the capsule opens, a restraint decouples from the locking mechanism and permits the resilient member to expand. Expansion of the resilient member causes the movable housing to move, thereby propelling the payload away from the capsule.