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1IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Smaller Size
Outcome of the test results with MP-P1 was the need for a reduced cross section
Rectangular Shaped Cross Section
One key topic is the storage of the tether
Classical winded coils contain high risk to get stuck during unwinding
Use of flex-board as tether together with slip-ring mechanism provides higher reliability
Water Tightness
Protection of MP electronics and payload against water turned out to be important
Externally Mounted Heater
Concentration of the heat-flow into the ice rather than heating the entire probe
Design Aspects
2IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Size: 40 x 40 x 195 mm
Estimated mass: 450g w/o electronics
Main Components
Cable cartridgeContains the tether and the slip-ring mechanism
BodyContains the MP electronics and provides space for the payload
TipContains front heater and provides space for optional vibration system
Overview
3IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Shall provide:
High value for the heat conduction
High weight density to shift the CoG close to the tip
Single curved surface to facilitate mounting of heater elements
Water tight interface to the main body
Space for vibration system
The Tip (1/2)
4IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Present design
Copper as material
Dimension 40 by 40 mm basis
Pyramidal shape
Flat heater foils
Space for temperature sensor at the utmost front
Threads for mounting of vibration system or other payload
The Tip (2/2)
5IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Shall provide:
Small mass
Optimised space for MP electronics and payload
Large openings for easy installation of MP electronics and payload
Water tight interface to the tip and the cable cartridge
The Main Body (1/2)
6IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Present design
Two flanges (stainless steel) to mount with tip and cable cartridge
Hull made from thin metallic sheets, glued onto the flanges
Flanges provide 4x M3 threads to fix tip and cartridge
Cut outs in flanges for gaskets (O-ring for water tightness)
M2 threads for fixation of electronics and payload
Opening for payloadapprox. 26 x 26 mm or18 x 34 mm respectively
The Main Body (2/2)
7IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Shall provide:
Small mass
Enough space to contain more than 10m of tether
Slip-ring mechanism with water tight cover
System to measure the vertical position of the probe
Water tight interface to the main body
The Cable Cartridge (1/2)
8IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Present design
Cartridge body manufactured as one piece
Final design has rather complex geometry
Some pieces have tiny dimensions (critical for assembly)
The Cable Cartridge (2/4)
Space for tether
Cutout for gasket
Bearing
Room for slip-ring
Fixation for side cover
9IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Present design
Hollow axle for fixation of tether
Rotating flange for fixation of slip-ring and bearing
Sleeve bearings type IGLIDUR® provide water tightness
Slip-ring from PCB material with gold plated surface
COTS elements as electrical contacts (rework to be applied)
The Cable Cartridge (3/4)
Cable not shown
Electrical contacts
Hollow axleSlip-ring
PCB for electrical contacts not shown Bearing
Teflon foil for protection of tether
Rotating flange
10IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2
Detailed view on cross section
The Cable Cartridge (4/4)
Cable not shownElectrical contacts
Hollow axle
Slip-ring
Side cover removed
Bearing Teflon foil for protection of tether
Rotating flange
PCB for electrical contacts
Position sensor
Rear cover
Gliding element for cable
11IWF-EXP/ÖAW GRAZ
MP
Pro
toty
pe 2 Mass budget
Tip: ~230g
Main body: ~75g w/o electronics and payload
Cable cartridge: ~65g w/o cable
Cable: ~80g
Status
Parts for the first model of cable cartridge are currently manufactured
Assembly within the next weeks
Test of slip-ring: 10.000 revolution with maximum current until end of the year
Summary