Controlled Separation Device Using Thermal Expansion
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Solution Overview
Problem
Existing separation systems for satellite appendages and equipment in space vehicles are unreliable, bulky, costly, and can cause damage or debris, particularly due to pyrotechnic systems, thermal fatigue, and abrupt heating methods, which are unsuitable for various orbital environments.
Innovation Solution
A controlled separation device using a stationary and mobile part with a bonding agent and electrical heating, where the stationary part has a higher thermal expansion coefficient than the mobile part, allowing for predictable separation without environmental dependence, and utilizing a wireless control system for remote operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If pyrotechnic systems are used for separation, then separation force is sufficient, but shocks and vibrations are produced causing damage to equipment
Solution Approach 1:
The patent uses thermal expansion of a connection element (such as a metal base or support structure) to achieve separation. When heated, the connection element expands, creating sufficient force to separate the deployable structure from the satellite body without producing shocks or vibrations. This resolves the contradiction by providing adequate separation force through controlled thermal expansion rather than explosive pyrotechnic forces.
Solution Approach 2:
The patent replaces the mechanical pyrotechnic separation system with a thermal-based separation mechanism. Instead of using chemical combustion to generate separation force, the system uses controlled heating of the connection element, substituting a mechanical/explosive system with a thermal field-based system that eliminates harmful mechanical shocks and vibrations.
2Reliability
If pyrotechnic systems are used for separation, then separation is achieved, but debris is jettisoned into space damaging instruments
Solution Approach 1:
The patent replaces the pyrotechnic system that generates debris with a thermal expansion-based separation mechanism. The connection element itself expands when heated and pushes the deployable structure away, eliminating the need for combustion and thus preventing debris generation. This maintains separation reliability while eliminating the harmful debris effect.
3Reliability
If metal base fatigue is used for separation, then separation occurs after thermal cycles, but separation time cannot be accurately determined and reliability is reduced
Solution Approach 1:
The patent applies preliminary action by actively heating the connection element to a predetermined temperature to trigger separation at a specific moment. Instead of relying on passive fatigue accumulation over unpredictable thermal cycles, the system pre-heats or rapidly heats the connection element to a critical temperature where separation occurs reliably and predictably, allowing accurate control of separation timing.
Solution Approach 2:
The patent uses parameter changes by controlling the temperature of the connection element as the key parameter for separation. By monitoring and controlling the temperature parameter, the system achieves predictable and reliable separation timing, replacing the unpredictable fatigue process with a controllable thermal parameter-based separation mechanism.
4Reliability
If screw and heating means are used for separation, then separation is achieved, but screw can become stuck requiring additional means
Solution Approach 1:
The patent extracts or removes the screw from the separation mechanism entirely. Instead of using a screw that may become stuck, the system uses a connection element that separates through uniform thermal expansion. This eliminates the stuck-screw problem and reduces device complexity by removing the need for additional extraction means.
5Productivity
If abrupt heating is used for separation, then separation is achieved quickly, but temperature control is difficult and equipment may be damaged
Solution Approach 1:
The patent applies local quality by heating only the specific connection element or localized region that requires separation, rather than heating the entire satellite or large areas. This localized heating approach enables quick separation while maintaining precise temperature control, as the heating energy is concentrated on a small, well-defined target area with controlled thermal boundaries.
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 a reliable, debris-free, and cost-effective separation mechanism that is not bulkier, ensuring minimal damage to surrounding equipment and allowing for precise control of the separation process, suitable for various orbital environments.
Implementation Method 1
The stationary part has a thermal expansion coefficient different from that of the mobile part... the stationary part has a higher thermal expansion coefficient than the mobile part, allowing for predictable separation
Implementation Method 2
at least one device for heating at least one of the stationary part and the mobile part
Data Source
AI summary
Disclosed is a device for controlled separation of a first so-called stationary part and a second so-called mobile part, the stationary part having a stationary connecting surface opposite a mobile connecting surface of the mobile part, the stationary part having a different thermal expansion coefficient from that of the mobile part, the separation device including: at least one connecting agent arranged in a layer between the stationary connecting surface and the mobile connecting surface, at least one device for heating at least one of the stationary part and the mobile part, and at least one system for controlling the heating device.