Radax Joint Pneumatic Separation for Low Shock

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Solution Overview

Problem

Existing rocket body separation systems using explosives create hazardous environments, are costly, generate debris, and induce high shock loads detrimental to electronic systems, making them logistically challenging and inefficient.

Innovation Solution

A low-shock rocket body separation system utilizing a radax joint with a flattened bladder and inflation system, which applies a separating force to overcome fastener loads and separate rocket bodies, reducing shock and assembly hazards, and incorporating pyrotechnic piston actuators for enhanced separation performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If explosives are used for rocket body separation, then separation force is sufficient, but shock load on electronic systems increases and hazardous environment is created

Engineering Contradiction:

Improveseparation forceVSAvoidshock load

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The patent replaces explosive-based mechanical separation with a pneumatic system using a bladder that inflates with gas to push the rocket body apart. The bladder is positioned between the separating bodies and inflated through a valve system, creating separation force through pneumatic pressure rather than chemical explosion, thereby eliminating high shock loads while maintaining sufficient separation capability

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The invention substitutes the chemical-mechanical explosive system with a controlled pneumatic-mechanical system. Instead of using explosives to generate instantaneous mechanical force, the system uses gradual pneumatic inflation to generate the same mechanical separation force, replacing a high-shock mechanical process with a low-shock alternative while achieving the same functional outcome

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If explosives are used for rocket body separation, then separation capability is achieved, but assembly hazards and logistics complexity increase

Engineering Contradiction:

Improveseparation capabilityVSAvoidassembly hazards

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs a disposable bladder component that is inserted into the separation joint, connected to inflation lines, and then discarded after a single use. The bladder is designed to be simple, inexpensive, and single-use, eliminating the need for complex reusable explosive systems while ensuring reliable separation capability through a straightforward replaceable component

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The invention extracts the hazardous explosive material from the separation system entirely, removing the source of assembly hazards and logistical complexity. By taking out the dangerous component and replacing it with a benign pneumatic system using inert gas and simple elastomeric bladders, the system maintains separation capability while dramatically improving safety and ease of assembly

Inventive Principle:

Principle #2Taking out (Extraction)

3Force

If explosives are used for rocket body separation, then separation force is generated, but debris is produced

Engineering Contradiction:

Improveseparation forceVSAvoiddebris

Core Design Contradiction:

ForceVSObject-generated harmful factors

Solution Approach 1:

The patent uses a flexible bladder made of elastomeric material that inflates to generate separation force. Unlike rigid explosive charges that fragment into debris, the flexible bladder maintains its integrity during inflation and separation, then can be cleanly deflated and removed as a single piece, eliminating debris generation while still providing sufficient compliant separation force

Inventive Principle:

Principle #30Flexible shells and thin films

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 system achieves reduced weight, increased strength, lower induced shock, and safer assembly logistics by eliminating the need for explosive systems, while maintaining high separation performance and integrating well with rocket bodies and electronics.

Implementation Method 1

the bladder is pressurized and exerts a separating force between the members of the radax joint

Methodology Applied

Scientific EffectPressure: Pressure Increase

Implementation Method 2

a flattened bladder and inflation system coupled thereto

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS8607705B2Low shock rocket body separation

Publication Date: 2013.12.17 KARMAN SPACE & DEFENSE LLC

AI summary

The present disclosure generally relates a high strength, low weight, and low shock rocket body separating joint for the purpose of joining rocket bodies, and method of assembly thereof. The solution combines a radax joint, joined by fasteners, with a flattened bladder and inflation system coupled thereto. Upon activation of the inflation system, the bladder is pressurized and exerts a separating force between the members of the radax joint, overcoming the load carrying capability of the fasteners and breaking apart the radax joint.