Lightweight UXO system Concept design For Berkeley Geophysics Concept design For Berkeley Geophysics

Lightweight UXO systemLightweight UXO system

Concept designFor Berkeley Geophysics

Concept designFor Berkeley Geophysics

04/18/23 Robin Lafever 2

Frank, Ugo,

Here is my take on the UXO hand held, rendered as a small cart.The intent was to address this as a design for manufacture, rather than a Lab prototype. The primary focus is on field operation and the attendant requirements for simplicity, and robustness.This concept reflects a more final production concept than usual (without details).And I addressed operational requirements such as cost-per-unit, manufacturability, robustness, field-repair and parts change.The concept presented has three main features:1. It assumes a high degree of integration, i.e. mechanical and electronic components are co-developed into integrated assemblies. 2. Tx and Rx fabrication can produce dimensionally consistent, self-supporting coils, especially Tx coils: and,3. Structures are blow-molded or composite assemblies designed for high volume production. (electronics also designed for high vol production...).

A word about Tx fabrication:We have experience and capability to fab self-supporting, dimensionally consistent Tx coils, but will have to develop tooling and procedures to achieve the consistency we will need.We will also have to do trade-offs with the electrical properties while we do this....I have typical cross-sections and material choices in mind that seem like appropriate starting points. I also have tooling in mind, but Ugo may already have a plan.If we can balance electrical and mechanical properties and still have a mechanically stable coil assembly, the 'blow-molded' design has a range of advantages that coincide with the design targets.

A word about 'blow-molded' design:Double-wall construction, hi-impact resistance, low weight, and low part cost, are hallmarks of the process. ( Along with ~zero conductivity )If we use the process cleverly, we can also get very simple assemblies, low part count, easy parts changes, and terrific robustness at no extra production cost.The main expense will be in the integration and design, then development of production tooling.I have looked into this deep enough to reassure myself that there is a clear path to prototyping functional iterations before committing to expensive production tooling.The scope of our proposal should NOT include production tooling.

NOTE: I did not include the battery pack Power Supply. Sorry.. I see it as a series of battery-packs worn on a belt on the Hips, or in a vest, a la TV cameramen; or in a backpack.

THE WHEELS are ambiguous at this point. They present the possibility of eating up design effort. This needs a closer look.

My take:An integrated detector assembly along these lines will be really robust, really cheap, and really simple.....when we get done. You could beat it with a baseball bat with not much effect.Even early, hand made prototypes could demonstrate this.The challenge is to integrate.

Comments?Robin

Two Transmitter configurations are presented.

Both are arranged in a 16” X 16” X 10” volumeWith Receiver arrays along the edges.

Rectangular cross-section transmitter coils(4 X 5 turns)

Flat ribbon cross-section transmitter coils(1 x 20 turns)

Receiver arrays


Flat ribbon cross section coilCorresponds to1 X 20 turns, .10 dia. copper wire.

This design concept assumes we can manufactureDimensionally stable coil units using B-phase adhesivesor potting techniques.


Flat ribbon cross section coil Set

Note offsets to allow the coils to nest


Nesting…..


Nesting…..


Nesting…..


Nesting…..


Nesting…..



Flat ribbon cross section coil SetFinal configuration with Receiver Array


Receiver Array

Note that Receivers pairsare Diagonally opposite.


Rectangular cross section coilCorresponds to4 X 5 turns, .10 dia. copper wire.

This design concept assumes we can manufactureDimensionally stable coil units using B-phase adhesivesor potting techniques.


Rectangular cross section coil Set

Note offsets to allow the coils to nest


Nesting…..





Nesting…..



Rectangular cross section coil SetFinal configuration with Receiver Array



Detector Assembly, Exploded


Mounting features for both the Transmitter and Receiver elements are molded into the housings.

Housings are Blow-molded, hi-impact, plastic.




Cutaway shows internal supportand alignment features, as well as, double wall construction.




Cutaway show internal supportand alignment features, as well as, double wall construction.

We can get superior shock absorption and light weight.


Mounting features for both the TransmitterAnd Receiver elements.



Baseline configuration:16” X 16” X 10” rectangular volume, nominal.


Cart HousingDouble-walled, blow-molded, hi-impact, plastic .


Clever design may allow us to put the assembly features directly into the Cart Housing and eliminate the detector packaging..



Adjustable handles

Thumb button padsData screen

Electronics

Housing

Integral wheels


Adjustable handles


Electronics

Housing

Integral wheels



Electronics


Adjustable handles


Electronics

Housing

Integral wheelsDetector Assembly


Adjustable handles


Electronics

Housing

Integral wheelsDetector Assembly


Adjustable handles


Electronics

Housing

Integral wheels

Detector Assembly


Adjustable handles


Electronics

Housing

Integral wheels

Detector Assembly



Electronics

Housing

Detector Assembly



ElectronicsDetector Assembly


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Lightweight UXO system Concept design For Berkeley Geophysics Concept design For Berkeley Geophysics