Projectile Parachute Braking Device with Delayed Deployment
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Solution Overview
Problem
Conventional aerodynamic braking systems for projectiles face challenges in controlling the opening moment of parachutes, leading to mechanical interference with the base during ejection, and lack a reliable solution for shifting the trajectory of a monolithic base, resulting in potential mechanical interference and unreliable braking.
Innovation Solution
An aerodynamic braking device featuring a parachute housed in a sleeve wound around an axis perpendicular to its longitudinal direction, connected to a cylindrical housing secured to the base, with extension cables and break lines that control the uncoiling sequence to delay parachute deployment and avoid interference, utilizing a textile loop for extraction and aerodynamic braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parachute is used for aerodynamic braking of the casing, then the braking effectiveness is improved, but the parachute deployment may be hindered by mechanical interference with the base during ejection
Solution Approach 1:
The extension cable is pre-wound around the cylindrical housing with break lines positioned to ensure delayed deployment. This preliminary arrangement of the cable and break lines guarantees that the parachute will only deploy after the casing has sufficiently separated from the base, preventing mechanical interference while maintaining braking effectiveness
Solution Approach 2:
The break lines are designed as weak points in the extension cable assembly that will fail under tension. This beforehand cushioning mechanism ensures that if the casing remains too close to the base during ejection, the break lines will break, allowing the parachute to deploy without causing mechanical interference or damage to the system
2Loss of time
If the parachute is deployed immediately after ejection, then the braking response time is improved, but the base and casing trajectories cannot be sufficiently separated, causing mechanical interference
Solution Approach 1:
The extension cable is pre-configured with break lines at specific intervals along its length. This preliminary arrangement ensures that the parachute deployment is automatically delayed until the casing has traveled far enough from the base, at which point the cable tensions and breaks the lines in sequence, achieving reliable deployment at the optimal moment
Solution Approach 2:
The system transitions from a static, fixed deployment mechanism to a dynamic one where the break lines are positioned to break at specific moments based on the relative motion between base and casing. This dynamic approach allows the braking response time to be optimized based on the actual separation distance achieved during ejection
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 controlled and interference-free parachute deployment, allowing for reliable aerodynamic braking and sufficient base distancing to prevent mechanical interference, enhancing the reliability and effectiveness of the braking system across various firing conditions.
Implementation Method 1
the payload must next be aerodynamically braked to be able to adopt a vertical descent trajectory
Implementation Method 2
the textile loop serving to ensure aerodynamic braking of the sleeve, thus facilitating the extraction of the hangers and the canopy of the parachute from the sleeve
Data Source
AI summary
An aerodynamic braking device for a payload casing intended to be ejected from a projectile on its trajectory including at least one parachute connected to the casing by hangers, the parachute and the parachute hangers being housed in a sleeve. The sleeve is wound around an axis of winding perpendicular to its longitudinal direction and attached to a cylindrical housing the axis of which is parallel to the axis of winding, which housing is itself secured to a shell base that closes off the projectile, the hangers being connected to the casing by an extension cable which is wound around the axis of the housing and attached thereto by at least three peripheral break lines which are uniformly angularly distributed.