Hydraulic-Elastic Separation Mechanism for Fluid Coupling Tests
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Solution Overview
Problem
Current test apparatuses are inadequate for simulating the diverse separation conditions of fluid couplings in launch vehicles, requiring multiple apparatuses for different fluid types and sizes, which are costly and complex.
Innovation Solution
A hydraulic test apparatus that mimics coupling forces using a control system with hydraulic loads, employing a biasing mechanism and controlled venting to replicate separation forces, allowing for a single apparatus to handle various fluid types and sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple different test apparatus are used to test coupling separation for various fluid types and sizes, then testing accuracy for specific conditions is improved, but device complexity and cost increase
Solution Approach 1:
The test apparatus is designed with a universal testing mechanism that can accommodate multiple coupling sizes (0.25 to 1.5 inches diameter) and test various fluid types (compressible and incompressible) using a single apparatus. The system uses interchangeable coupling holders and adjustable testing parameters to maintain accuracy across different test conditions while eliminating the need for multiple specialized test rigs.
Solution Approach 2:
The apparatus employs programmable control systems that allow dynamic adjustment of testing parameters including separation speed, force application rate, and pressure control based on the specific fluid type and coupling size being tested. This enables a single apparatus to adapt its behavior to match the specific testing requirements of different fluid-coupling combinations.
2Force
If expensive hydraulic pumps and large fluid flow control valves are used to mimic large separation forces, then separation force capability is improved, but cost and device size increase
Solution Approach 1:
The system uses dynamic force application through programmable actuators that can vary the separation force in real-time during the test. Rather than requiring continuously high force capability, the system applies force dynamically matched to the actual separation process, using only the necessary force at each moment of the test cycle.
Solution Approach 2:
The testing mechanism employs periodic cycles of force application and release, where the actuator applies separation force during the actual separation event and then releases or reduces force during repositioning and reset phases. This periodic action allows the use of smaller, less expensive actuators that can handle peak forces intermittently rather than requiring continuous high force capability.
3Reliability
If different apparatus and control systems are used for compressible and incompressible fluids, then testing accuracy for specific fluid behavior is improved, but device complexity increases
Solution Approach 1:
The control system automatically adjusts testing parameters such as separation speed, force application rate, and pressure control based on the selected fluid type (compressible or incompressible). For incompressible fluids like hydraulic fluid, the system uses slower separation speeds and progressive force application to account for vacuum formation. For compressible fluids, faster separation speeds are permitted. These parameter changes are managed through a single unified control system rather than requiring separate apparatus.
Solution Approach 2:
The apparatus incorporates sensors and feedback control mechanisms that monitor actual separation forces, pressures, and displacement during testing. The control system uses this feedback to automatically adjust test parameters in real-time to match the expected behavior of the specific fluid type being tested, ensuring accuracy for both compressible and incompressible fluids through a single adaptive system.
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 apparatus efficiently replicates a wide range of separation conditions for propellant, hydraulic, and pneumatic couplings, reducing costs and complexity by using energy stored in biasing mechanisms, and enabling robust, repeatable testing.
Implementation Method 1
A biasing mechanism is provided between the base and the movable yoke
Implementation Method 2
A hydraulic actuator is provided between the base and the movable yoke
Data Source
AI summary
A system and method for testing the decoupling of fluid fittings utilizing a hydraulic circuit in combination with a biasing mechanism to emulate the separation forces experienced by such couplings is disclosed. The biasing mechanism is loaded with a predetermined force and the flow of hydraulic fluid within the hydraulic circuit is controlled to follow desired separation force profiles.