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