WO2015000021A1 - A support structure - Google Patents
A support structure Download PDFInfo
- Publication number
- WO2015000021A1 WO2015000021A1 PCT/AU2014/000692 AU2014000692W WO2015000021A1 WO 2015000021 A1 WO2015000021 A1 WO 2015000021A1 AU 2014000692 W AU2014000692 W AU 2014000692W WO 2015000021 A1 WO2015000021 A1 WO 2015000021A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frame
- support structure
- elongate member
- induced polarization
- polarization array
- Prior art date
Links
- 230000010287 polarization Effects 0.000 claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 238000005728 strengthening Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101100285518 Drosophila melanogaster how gene Proteins 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/15—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat
- G01V3/16—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat specially adapted for use from aircraft
Definitions
- a SUPPORT STRUCTURE FIELD OF INVENTION [000.1 ]
- the present invention relates to a support stru cture
- the present invention relates to a support structure for an airborne electromagnetic or induced polarization array
- Electromagnetic surveying normally entails the emission of electromagnetic field pulses to generate eddy currents in the ground that induce a secondary current in any underground conductors.
- the resultant electromagnetic Field can be measured as it decays after the emission of the pulses to map the terrain conductivity.
- Induced polarization surveying is conducted by inducing a current in the ground area to be surveyed and measuring the decaying potential difference thereof over time.
- transmission support structure with the coils and loops required to transmit the electromagnetic pulses and induced polarization currents mounted thereto.
- Such support structures comprise a plurality of elongate members which are joined using elbow connectors to form a polygon or circular shape frame * A variety of materials have been employed to make these support structure rangi ng from tubes made of metal, fibre glass or even carbon fibres,
- the support structures are commonly heavy and require significant labour to assemble. Furthermore, due to their large sizes, transportation of assembled structures is often not possible and the frame needs to be disassembled before it can be transported to other areas,
- the present invention attempts to overcome at least in part the aforementioned disadvantages of previous support structure in that there is provides a Sight weight frame that may be relatively easily disassembled and transported.
- a support structure for an airborne electromagnetic or induced polarization array comprising:
- attachment means for attachin the elongate members together in an end-on-end manner to form a .frame
- the frame is capable of supporting a transmitter and/or a receiver of the electromagnetic or induced polarization array.
- the frame may be a planar loop being polygonal or circular in shape.
- Each elongate member may comprise at least two tubular sections located adjacent to each other and joined together.
- the tubular sections may be cylindrical.
- tubular sections may be joined together by straps passing around the tubular sections.
- Each elongate member may be substantially triangular in cross section. [0015] Each elongate member may have a valve port permitting inflation and/or deflation of that elongate member.
- Each elongate member may include a strengthening rod at one end thereof for engaging with an opposed end of a neighbouring elongate member.
- the support structure may include tensioning cables extending between selected elongate members across the frame and co-planar therewith, the tensioning cables being adapted to structurally support the frame to restrict deformation of the frame.
- the support structure may include a plurality of suspension cables joined to the frame at spaced apart intervals.
- the suspension cables may congregate at a verte located away from the plane of the frame to form a pyramidal shape.
- the suspension cables may be adapted to be attached to a tow line for suspending the frame from an aircraft.
- the respective suspension cables may have differing lengths whereby the. suspension cables attached to an operative leading edge of the frame are shorter than those attached to an operative trailing edge of the frame, in use, assisting the frame in maintaining a substantially horizontal orientation when suspended from an aircraft moving at a survey flight speed,
- the invention extends to an airborne electromagnetic or induced polarization array comprising the support structure as described herein.
- the airborne electromagnetic and induced polarization array may include a transmitter and/or receiver supported by the frame.
- the transmitter and/or receiver may be supported concentrically and co-pianar within the frame.
- Figure 3 is a perspective view of a support structure in accordance with an embodiment of the present invention showing a frame joined to a plurality of suspension cables?
- Figure 2 is a side view of the support structure shown in Figure 1;
- Figure 3 is a plan vie of the frame of the support structure shown in Figure 1 ;
- Figure 4 is an enlarged perspective view of an elongate member forming part of the frame of Figure 3;
- Figure 5 is an enlarged end view of the elongate member seen along arrow V in Figure 4;
- Figure 6 is an enlarged side view of a first end of the elongate member indicated by arrow VI in Figure 5;
- Figure 7 is an enlarged side view of a second end of the elongate member indicated by arrow VTI in Figure 5,
- FIG. 10 there is shown a support structure in accordance with an embodiment of the invention, being generally indicated by reference numeral 10.
- the support structure 10 is adapted to support an airborne electromagnetic or induced polarization array by suspending it from an aircraft during use,
- the support, structure 10 includes a planar frame 12 formed by plurality of inflatable elongate members 14 that are releasably attached to each other in an end-o -end manner to form a closed loop being polygonal or circular in shape.
- the frame 12 has a circular shape thereby, in use, to substantially remove null points in an electromagnetic field pulse generated by the array supported by the support structure 10,
- the elongate member 14 is formed by at least two similar cylindrical or tubular sections 16, being generally sausage- like in appearance, which are located adjacent to each other and joined together by a number of straps 18 passing around the tubuiar sections 16 at various locations long their length, in the exemplary embodiment, the elongate member 14 is constituted by three tubular sections 16 being arranged in a substantially triangular shape when seen in cross section.
- the elongate member 14 can be formed by only a single tubular section 16. in the latter case, the elongate member 14 can optionally be provided with internal dividing walls to provide separate internal compartments.
- the elongate member 14 and/or each tubular section 16 is made of a gas impervious flexible material.
- the material contains braided fibers defining the surface of the tubuiar sections 16, with the fibers following continuous left and right spiral paths over the length thereof.
- the material also has axial fibers contained within spaces formed between the braided fibers.
- the tubular sections 16 can be made gas impervious by either coating or impregnating the braided fibers with an eiastomeric material o by providing a synthetic eiastomeric lining bladder within the cylinder defined by the braided fibers.
- the material can be cloth or canvas sheet material also being impregnated with the eiastomeric material or enclosing the eiastomeric lining bladder.
- the elongate member 14 and/or each tubular section 16 has a valve port 20 permitting the inflation or deflation thereof.
- the inflation will normally be performed by pumping air into the tubular section 16, but optionally other gases could be used, such as helium.
- the elongate member 14 In its deflated state the elongate member 14 is flexible and can be rolled up or manipulated into any desired shape, whereas in its inflated state the elongate member 14 has a certain structural rigidity.
- corresponding quick release clips 22 for joining neighbouring elongate members 14 to each other erid-on-end to form the loop shaped frame 12. Any number of elongate members 14 can be joined together depending on the size of the frame 12 that is required.
- the elongate member 1 further includes at least one, but preferably multiple, strengthening rod 24 extending longitudinally beyond one end thereof for engaging with an opposed end of a neighbouring elongate member 14 in the frame 12, Thereby the rod 24 traverses the end-on-end join between neighbouring elongate members 14 and restiicts excessive bending of the frame 12 at the join and transverse forces being applied to the clips 22,
- the rods 24 are either secured to the elongate members 14 by the straps 18 or by insertion into pocket sleeves,
- Each rod 24 can be in the form of a rigid hollow tube, chosen for its strength and weight characteristics.
- the rod 24 can be an inflatable tube having a high internal pressure.
- tensioning cables 26 are joined thereto so as to extend between various selected elongate members 14 across the frame 12 and co-planar therewith.
- the tensioning cables 26 provide a tension force within the frame 12 to stracturaily support the frame 12 and restrict deformation thereof so that it retains a desired shape.
- the tensioning cables 26 are arranged to engage with adjacent or nearly adjacent elongate members 14 (as shown in Figure 3), resulting in a Sattjcework of tensioning cables 26 near to the frame 12 so as to leave an open central area within the frame 12,
- the tensioning cables 26 can also be arranged as spokes extending radially or directly across the frame 12.
- the rods 24 assist the tensioning cables 26 in maintaining the desired shape of the frame 12,
- the support structure 10 is formed by attaching a plurality of suspension cables 28 to the frame 12 at discrete spaced apart intervals,
- the suspension cables 28 congregate at a vertex 30 located away from the plane of the frame 1.2 so that the. support structure has a pyramidal shape.
- the vertex 30 is adapted to be joined to a tow line 36 so as to enable the support structure 10 to be suspended beneath an aircraft.
- the suspension cables 28 have differing lengths and are arranged such thai those being attached to an operative leading edge 32 of the frame 12 are shorter than those being attached to an operative trailing edge 34 of the frame 12,
- the differing lengths cause the vertex 30 to be offset from the centre of the frame 12, and thereby assist the frame 12 in maintaining a substantially horizontal orientation when suspended below and towed by the aircraft at a survey flight speed,
- the support structure 10 may further comprise a receiver shell which is disposed substantially concentrically and co-planar within the frame 12.
- the elongate members 14 are laid out in the required positions, to create the requisite shape of frame 12, and the neighbouring elongate members 14 are joined to each other by the clips 22 and the rods 24, Thereafter the elongate members 14 are inflated by bringing the valve ports 20 in communication with a source of pressurised gas or air,
- the tensioning cables 26 are fixed between the desired elongate members 1 and the amount of tension force applied to stabilise the shape of the frame 12.
- the suspension cables 28 are then also attached to the frame 12 and joined to the aircraft's tow line 36 at which time the electromagnetic or induced polarization array can be arranged on the support structure 10.
- the latticework of tensioning cables 26 act together with the frame 12 to provide the support to which the electromagnetic or induced polarization array and/or the receiver shell can be secured.
- the support structure 10 can be collapsed and disassembled by deflating the elongate members. This is done either fay simply opening the valve ports 20 to allow the air to vent to the atmosphere from the elongate members 14 or by applying a suction force to the valve ports 20 to more quickly exhaust the air from the elongate members 14.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Aviation & Aerospace Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Aerials With Secondary Devices (AREA)
- Clamps And Clips (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2014286914A AU2014286914B2 (en) | 2013-07-05 | 2014-07-04 | A support structure |
CA2916738A CA2916738A1 (en) | 2013-07-05 | 2014-07-04 | A support structure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2013902502 | 2013-07-05 | ||
AU2013902502A AU2013902502A0 (en) | 2013-07-05 | An airborne electromagnetic and induced polarization array |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015000021A1 true WO2015000021A1 (en) | 2015-01-08 |
Family
ID=52142932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2014/000692 WO2015000021A1 (en) | 2013-07-05 | 2014-07-04 | A support structure |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2014286914B2 (en) |
CA (1) | CA2916738A1 (en) |
WO (1) | WO2015000021A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105824049A (en) * | 2016-03-21 | 2016-08-03 | 哈尔滨飞机工业集团有限责任公司 | Hanging-type helicopter time domain aeromagnetic detection pod |
CN106199741A (en) * | 2016-07-04 | 2016-12-07 | 哈尔滨工业大学 | A kind of pod propulsion time domain aviation transient electromagnetic exploration system based on lightweight gas tube supporting construction |
CN106226820A (en) * | 2016-07-04 | 2016-12-14 | 哈尔滨工业大学 | A kind of lightweight inflation ring supporting construction for pod propulsion time domain aviation transient electromagnetic exploration system |
US10252801B2 (en) | 2015-02-27 | 2019-04-09 | Geotech Ltd. | Electromagnetic survey system having tow assembly with attitude adjustment |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090212778A1 (en) * | 2008-02-25 | 2009-08-27 | Geotech Airborne Limited | Large airborne time-domain electromagnetic transmitter coil system and apparatus |
WO2010105337A1 (en) * | 2009-03-17 | 2010-09-23 | Geo Equipment Manufacturing Limited | Geophysical prospecting using electric and magnetic components of natural electromagnetic fields |
-
2014
- 2014-07-04 AU AU2014286914A patent/AU2014286914B2/en not_active Expired - Fee Related
- 2014-07-04 WO PCT/AU2014/000692 patent/WO2015000021A1/en active Application Filing
- 2014-07-04 CA CA2916738A patent/CA2916738A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090212778A1 (en) * | 2008-02-25 | 2009-08-27 | Geotech Airborne Limited | Large airborne time-domain electromagnetic transmitter coil system and apparatus |
WO2010105337A1 (en) * | 2009-03-17 | 2010-09-23 | Geo Equipment Manufacturing Limited | Geophysical prospecting using electric and magnetic components of natural electromagnetic fields |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10252801B2 (en) | 2015-02-27 | 2019-04-09 | Geotech Ltd. | Electromagnetic survey system having tow assembly with attitude adjustment |
CN105824049A (en) * | 2016-03-21 | 2016-08-03 | 哈尔滨飞机工业集团有限责任公司 | Hanging-type helicopter time domain aeromagnetic detection pod |
CN106199741A (en) * | 2016-07-04 | 2016-12-07 | 哈尔滨工业大学 | A kind of pod propulsion time domain aviation transient electromagnetic exploration system based on lightweight gas tube supporting construction |
CN106226820A (en) * | 2016-07-04 | 2016-12-14 | 哈尔滨工业大学 | A kind of lightweight inflation ring supporting construction for pod propulsion time domain aviation transient electromagnetic exploration system |
Also Published As
Publication number | Publication date |
---|---|
AU2014286914B2 (en) | 2017-12-07 |
AU2014286914A1 (en) | 2016-01-28 |
CA2916738A1 (en) | 2015-01-08 |
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