Sediment Core Sampler With Constant-Force Tube Insertion
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Solution Overview
Problem
Existing sediment sampling methods require large reaction forces, making them difficult or impossible to perform from smaller, lower mass vehicles, and existing systems compromise sample integrity or require costly and infrastructure-heavy ROVs or HOVs for precise collection.
Innovation Solution
A novel sampler system using a stationary frame assembly with a first drive mechanism and a traveling frame assembly, employing a second drive mechanism with constant-force springs to insert core tubes without relying on vehicle reaction forces, and an occlusion mechanism to maintain sample integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional core samplers are used, then sediment core samples can be collected, but large reaction forces are required that cannot be generated by smaller vehicles
Solution Approach 1:
The drive system is segmented into two independent mechanisms: a first drive mechanism for initial core tube advancement and a second drive mechanism for continued insertion. This segmentation allows each mechanism to be optimized for its specific function, with the second mechanism generating high insertion forces independently of vehicle mass through direct engagement with the core tube.
Solution Approach 2:
The core tube itself serves as an intermediary element between the drive mechanisms and the sediment. The first drive mechanism advances the core tube a initial distance, then the second drive mechanism engages directly with the core tube to provide the necessary insertion force, effectively using the core tube as a force transmission medium that does not require direct vehicle force generation.
2Measurement precision
If ROVs or HOVs are used for precise sample collection, then sample collection precision is improved, but cost and infrastructure requirements increase significantly
Solution Approach 1:
The system incorporates automated control that enables the smaller vehicle to perform precise sampling operations independently. The controller coordinates the two drive mechanisms and occlusion mechanism to achieve precise sample collection without requiring external ROV/HOV intervention or complex infrastructure support, making the system self-sufficient.
Solution Approach 2:
The invention changes the operational parameters by using a two-stage drive process with specific transition criteria. The controller monitors advancement distance or time and triggers the second drive mechanism at the optimal moment, allowing precise control of core tube insertion depth and timing without requiring the complex maneuvering capabilities of ROVs or HOVs.
3Length of moving object
If the first drive mechanism advances the core tube, then initial insertion is achieved, but additional force is needed for complete insertion
Solution Approach 1:
The first drive mechanism performs a preliminary action by advancing the core tube a initial distance into the sediment before the second drive mechanism is activated. This preliminary advancement positions the core tube for optimal engagement with the second drive mechanism, which then provides the additional force needed to achieve complete insertion depth.
Solution Approach 2:
The two drive mechanisms operate in continuous sequence without interruption. The first drive mechanism advances the core tube, then the second drive mechanism immediately takes over to continue the insertion process to full depth. This continuous action ensures the core tube reaches the required insertion depth without stopping, maintaining the useful action of sediment penetration throughout the process.
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
Enables high-quality sediment core samples from smaller vehicles, reducing costs and infrastructure requirements while maintaining sample integrity, comparable to conventional methods but with improved efficiency and scalability.
Implementation Method 1
The second drive mechanism applies a constant force while driving the core tube to the fully extended position
Data Source
AI summary
A system and method for obtaining a sediment core sample utilizing a stationary frame assembly including a first drive mechanism, and at least one traveling frame assembly movable in a first direction relative to the stationary frame and carrying at least one core tube and carrying a second drive mechanism for each core tube. The first drive mechanism, activated by a controller, is configured to advance the traveling frame in the first direction until a selected parameter is achieved. The second drive mechanism is configured to drive the core tube to a fully extended position in the first direction, when the selected parameter is achieved, by applying a constant force while driving the core tube to the fully extended position. An occlusion mechanism blocks the opening of each core tube after the core tube is removed from the sediment.