Damped Docking Stud Retraction for Fast Satellite Separation
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Solution Overview
Problem
Current separation systems for satellite constellations with large diameter and mass studs fail to achieve rapid retraction within 20 ms, as existing devices are unsuitable for studs larger than 20 mm and 1 kg, and cannot meet the performance criteria required for quick and safe stud retraction.
Innovation Solution
A separation device with a retraction spring and damping material that converts kinetic energy into deformation energy, allowing the docking stud to be safely housed in a cap after separation, using a pre-stressed spring to propel it into damping material for shock absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a notched cage is used to absorb shock and prevent stud piercing, then the cap structure is protected, but the stud retraction speed is reduced and cannot meet the <20 ms requirement
Solution Approach 1:
A damping element is installed at the bottom of the cap before separation occurs. This cushioning element absorbs the shock when the stud impacts the cap bottom, allowing the stud to be contained without requiring a notched cage structure that would slow retraction. The damping element is positioned in advance to immediately absorb impact energy upon stud contact.
Solution Approach 2:
The harmful notched cage structure is extracted and replaced with a simple damping element at the cap bottom. This removal of the complex cage structure eliminates the speed limitation while maintaining protection functionality through the damping material alone.
2Speed
If a retraction spring is added to propel the stud quickly into the cap, then retraction speed increases to meet <20 ms, but the device complexity increases
Solution Approach 1:
The retraction spring is merged with the existing cap structure. The spring is positioned within the cap's internal volume and works in conjunction with the damping element already present at the cap bottom. This integration achieves rapid retraction without adding separate complex mechanisms, as the spring and cap form a unified retraction system.
Solution Approach 2:
The retraction spring acts as an intermediary mechanical element between the separation event and the stud. It converts the separation energy into directed kinetic energy that propels the stud into the cap, mediating the transition from separation to contained state without requiring complex control systems.
3Strength
If the stud is made with large diameter (>20 mm) and significant mass (>1 kg) for satellite constellation connections, then connection strength is improved, but the shock energy upon impact increases requiring more robust damping
Solution Approach 1:
The damping element is designed with specific material parameters (elastoplastic or viscoelastic properties) that allow it to absorb the high impact energy generated by large, massive studs. The material parameters are selected to match the energy levels produced by studs with diameter >20 mm and mass >1 kg, transforming the shock energy into deformation energy of the damping material.
Solution Approach 2:
The damping element uses composite material properties (elastoplastic or viscoelastic) that combine elastic recovery with energy dissipation. This composite behavior allows the material to withstand the high impact forces from massive studs while effectively absorbing and dissipating the shock energy through internal friction and deformation mechanisms.
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 device achieves rapid and stable housing of the docking stud in the cap, absorbing shock and maintaining it there during the satellite's service life, ensuring safe and efficient separation.
Implementation Method 1
a retraction spring for extracting the docking stud from the first interface, propelling it towards a damping material
Implementation Method 2
absorbing shock and maintaining it there during the satellite's service life
Implementation Method 3
damping material disposed at the bottom of the cap and holding it there by its residual holding force alone
Data Source
AI summary
Device for separating a second part from a first part, including a first interface intended to be fixed to the first part and a second interface intended to be fixed to the second part, a docking stud passing through the first and second interfaces and being held at the first interface by a separation nut and at the second interface by a first nut/locknut assembly, the docking stud being covered by a cap secured to the second interface and intended to receive it once the separation nut has broken and the first and second interfaces have been separated, and a retraction spring is provided to extract the docking stud from the first interface, propel it towards a damping material fixed at the bottom of the cap and hold it there by its residual holding force alone.