WO2015145313A1 - Transducteur de forces radiales, en particulier pour des arbres rotatifs - Google Patents

Transducteur de forces radiales, en particulier pour des arbres rotatifs Download PDF

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Publication number
WO2015145313A1
WO2015145313A1 PCT/IB2015/052029 IB2015052029W WO2015145313A1 WO 2015145313 A1 WO2015145313 A1 WO 2015145313A1 IB 2015052029 W IB2015052029 W IB 2015052029W WO 2015145313 A1 WO2015145313 A1 WO 2015145313A1
Authority
WO
WIPO (PCT)
Prior art keywords
transducer
cross
piece
pillars
longitudinal direction
Prior art date
Application number
PCT/IB2015/052029
Other languages
English (en)
Inventor
Fabrizio ORTOLANI
Giulio DUBBIOSO
Original Assignee
Consiglio Nazionale Delle Ricerche
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Consiglio Nazionale Delle Ricerche filed Critical Consiglio Nazionale Delle Ricerche
Publication of WO2015145313A1 publication Critical patent/WO2015145313A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction
    • G01L1/2237—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction the direction being perpendicular to the central axis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
    • G01L5/161—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance
    • G01L5/1627—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance of strain gauges

Definitions

  • the present invention relates to a transducer of radial forces, in particular apt to be applied for determining the radial efforts acting on rotating shafts during the rotation thereof, without interfering therewith.
  • a similar transducer has several application possibilities, especially to verify that a shaft is not subjected to efforts which could jeopardize the integrity thereof .
  • a particular application, therefor the present transducer has been developed, relates to the application to rotating shafts of propellers, wherein the efforts determined by the propeller on the shaft describe the propeller operation and efficiency.
  • the use of the transducer subject of the present patent upon performing tests on models allows quantifying the efforts thereto the axes of the propellers and the respective supports have been subjected, during navigation and procedures for moving the hull.
  • DE 199 60786 Al describes a sensor for radial forces in a lifting arm with annular shape.
  • DE 89 09048 Ul describes instead a sensor for measuring induced forces implemented by a single piece.
  • the technical problem underlying the present invention is to provide a transducer of radial forces allowing to obviate the drawback mentioned with reference to the known art .
  • transducer as specified above comprising :
  • a base member apt to be applied to a frame, shaped like a ring and comprising a central opening for the passage of a rotating shaft, defining a longitudinal direction coinciding with the axis of said rotating shaft;
  • each cross-piece having a passage circular hole acting as bushing for said shaft, the holes of each cross-piece being concentric and overlapping;
  • each pillar having at least a respective strain gauge applied on its own surface, oriented according to said longitudinal direction.
  • the main advantage of the transducer according to the invention consists in its easy mounting on a rotating shaft, wherein the measurement of the radial forces is mechanically released from the rotation itself and possible torques bending the shaft, and wherein the overall dimensions are of course reduced by the transducer structure, which then can be received within a real application.
  • figure 1 shows an axonometric view of a first embodiment of transducer of radial forces according to the invention
  • figure 2 shows a raised side view of the transducer of figure 1 ;
  • figure 3 shows another raised side view of the transducer of figure 1, from a point of view rotated by 90° with respect to the previous view;
  • figure 4 shows a top plan view of the transducer of figure 1;
  • figure 5 shows an axonometric view of a second embodiment of transducer of radial forces according to the invention
  • figure 6 shows another axonometric view of the transducer of figure 5, from a different point of view;
  • figure 7 shows an additional axonometric view of the transducer of figure 5, from another bottom point of view;
  • figure 8 shows a raised side view of the transducer of figure 5;
  • figure 9 shows another raised side view of the transducer of figure 5, from a point of view rotated by 90° with respect to the previous view;
  • figure 10 shows a top plan view of the transducer of figure 5.
  • a transducer for radial forces is designated as a whole with 1.
  • the same numeral references will be used to designate analogous portions of different embodiment examples.
  • a transducer 1 comprises a base member 2 substantially shaped like a ring, with circular or square shape; such base member 2 is destined to be fastened to a fixed, that is not rotating, portion of the destination site wherein the radial forces applied to a rotating shaft could be measured.
  • fastening holes 3 are formed, four in the present example, spaced apart by 90° one with respect to the other one. They are provided to be engaged by fastening members to a frame, such as screws or rivets.
  • the base element 2 further comprises a central opening 4 for the passage of a (not represented) rotating shaft; it defines a longitudinal direction of the transducer coinciding with the axis of said rotating shaft and which is perpendicular to the radial directions thereon one wishes to measure the efforts applied to the shaft.
  • the transducer 1 further comprises a first and a second bridge-like, respectively inner and outer, or lower and upper, structure, designated with 5 and 11.
  • a first bridge-like structure 5 comprises respective first pillars 6 arranged on opposite sites of one face of the base element 2, face which will be designated hereinafter as upper face, opposite to a lower or resting face.
  • first pillars 6 The position of the first pillars 6 is so that the first bridge-like structure 5 extends so as to cross said central opening 4. They extend parallelly with respect to said longitudinal direction as far as one first distal top thereof 7 and have a respective outer flat surface 8.
  • Said distal tops 7 are connected by a first transversal cross-piece 9 to said opening 4; it has a first passage hole 10 arranged to act as bushing for said shaft.
  • the second bridge-like structure 11 comprises respective second pillars 12 arranged on opposite sites of the upper face of the base element 2, selected so as to be half way between said first pillars 6. Then even the second bridge-like structure 11 extends so as to cross said central opening 4.
  • the second distal tops 13 are connected by a second cross-piece 15 transversal to said opening 4; it has a second passage hole 16, arranged too to act as bushing for said rotating shaft.
  • the holes 10, 16 of each cross-piece 9, 15 are concentric and overlapped so as to stand above said opening 4 with respect thereto they are analogously concentric.
  • each hole 10, 16 is slightly made oval: the first hole 10 has close opposite sides, different from the two rounded ends, having each one a first contact area 17 between first hole 10, and respective first cross-piece 9, and the surface of the shaft crossing the first hole. Said opposite sides are faced, each one, towards the respective first pillar 6. Even the second hole 16 has close opposite sides, different from the two rounded ends of the oval, having a second contact area 18 between first hole 10, and second cross-piece 15, and the surface of the shaft crossing the second hole. Said opposite sides are faced, each one, towards the respective second pillar 12. In this way, first and second contact areas 17, 18 are staggered therebetween by 90° on the base element 2.
  • each one of said first and second pillar 6, 12 has at least a respective strain gauge (designated with 30 in the subsequent embodiment) applied on its own surface, in particular but not exclusively on the respective first and second outer surface 8, 14.
  • strain gauges which then are present in number 4, are all directed according to said longitudinal direction, so as to be able to measure the longitudinal deformations of the pillars 6, 12 which will result from the pressures exerted by the shaft on one or two of said contact areas 17, 18.
  • Such pressures could cause the deformation in elongation of a pillar and in shortening of the opposite one thereof, for one or both bridge-like structures.
  • Said strain gauges could be of the electrical resistance type, and they could be uniaxial.
  • the four strain gauges could be connected therebetween so as to constitute a so-called Wheatstone bridge, allowing to measure easily the differences between the electrical resistances modified by the efforts on the shaft.
  • the pillars 6, 12 of said first and second bridge-like structure 5, 11, have different longitudinal extensions so that said cross- pieces 9, 15 are at different heights from said base element 2, so as to create two mechanically uncoupled measuring members .
  • transducer 1 comprises a base member 2 substantially shaped like a ring with squared outer sides; it has its own four passage holes 3 at each angle of the base element 2, apt to be engaged by members for fastening to a frame such as screws or rivets.
  • the base element 2 then comprises a central opening 4 for the passage of a (not represented) rotating shaft defining a longitudinal direction of the transducer 1 coinciding with the axis of said rotating shaft and which is perpendicular to the radial directions thereon one wishes to measure the efforts applied to the shaft.
  • the transducer 1 further comprises a first and a second bridge-like structure, arranged substantially like those described previously by referring to the first embodiment, respectively designated with 5 and 11. Briefly, they comprise first and second pillars 6, 12 arranged on opposite sides of an upper face of the base element 2, extending in longitudinal direction as far as a respective first and second distal top 7, 13 and which have a respective first and second outer flat surface 8, 14.
  • the distal tops 7, 13 are connected in pairs by a respective first and second cross-piece 9, 15 transversal to said opening 4 and with a respective first and second passage hole 10, 16 arranged to act as a bushing for said shaft .
  • the pillars are constituted by plates assembled perpendicularly therebetween, thanks to suitable screws 20 with hexagonal head and with right-angle connection members 21, arranged at the basis and at the top of each pillar 6, 12.
  • the cross-pieces 9, 15 are made of metallic material with thickness substantially equivalent to that of the base element 2, whereas the pillars 6, 12 are constituted by suitable interchangeable measurement plates, whereon respective strip strain gauges 30 are applied thanks to a pair for each pillar outer surface.
  • strain gauges are directed according to said longitudinal direction, so as to be able to measure the longitudinal deformations of the pillars 6, 12 which will result from the pressures exerted by the shaft.
  • Such pressures could cause the deformation in elongation of a pillar and a shortening of the opposed one thereof, for one or both bridge-like structures.
  • first and second ribs 22, 23 which are arranged parallel to the transversal development of the correspondent first and second pillars 6, 12.
  • the ribs 22, 23 narrow the passage aperture of the respective hole 10, 16 and constitute contact areas between the corresponding cross-piece 9, 15 and the rotating shaft, so as to uncouple mechanically the two measurement member.
  • the above-mentioned contact areas will be made of a material with low friction coefficient.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)

Abstract

La présente invention concerne un transducteur (1) de forces radiales, en particulier pouvant être appliqué pour déterminer les efforts radiaux exercés sur des arbres rotatifs pendant la rotation de ceux-ci, par détermination de la quantité minimale d'espace, qui comprend : un élément de base (2), apte à être appliqué sur un cadre, sensiblement en forme d'anneau et comprenant une ouverture centrale (4) pour le passage d'un arbre rotatif, définissant une direction longitudinale coïncidant avec l'axe dudit arbre rotatif ; et une première et une deuxième structures en forme de pont (5, 11), s'étendant depuis un point dudit élément de base (2) à un point opposé à celui-ci, traversant ladite ouverture centrale, comprenant des montants opposés (6, 12), s'étendant parallèlement à ladite direction longitudinale, et une traverse respective (9, 5) reliant les sommets distaux des deux montants opposés, chaque traverse ayant un trou de passage agissant comme un manchon pour ledit arbre ; et chaque montant ayant au moins une jauge de contrainte respective appliquée sur sa propre surface (8, 5), orientée selon ladite direction longitudinale.
PCT/IB2015/052029 2014-03-28 2015-03-19 Transducteur de forces radiales, en particulier pour des arbres rotatifs WO2015145313A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM20140164 2014-03-28
ITRM2014A000164 2014-03-28

Publications (1)

Publication Number Publication Date
WO2015145313A1 true WO2015145313A1 (fr) 2015-10-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/052029 WO2015145313A1 (fr) 2014-03-28 2015-03-19 Transducteur de forces radiales, en particulier pour des arbres rotatifs

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106644210A (zh) * 2015-10-30 2017-05-10 中石化石油工程技术服务有限公司 一种圆柱形工件测力装置
KR101900048B1 (ko) * 2017-08-25 2018-09-18 재단법인 대구경북과학기술원 힘센서 모듈

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8909048U1 (de) 1989-07-26 1989-10-05 Dornier Gmbh, 7990 Friedrichshafen Kraftmeßsensor
WO1994007118A1 (fr) 1992-09-24 1994-03-31 Asea Brown Boveri Ab Tranducteur circulaire de force radiale
DE19960786A1 (de) 1999-12-16 2001-06-21 Schenck Process Gmbh Radialkraftaufnehmer
US20120234104A1 (en) 2011-03-15 2012-09-20 Deutsches Zentrum Fur Luft-Und Raumfahrt E.V. Force/moment sensor for measurment of forces and moments
US20120266694A1 (en) 2009-12-08 2012-10-25 Abb Ag Multiaxial force-torque sensors
EP2549253A1 (fr) * 2011-07-19 2013-01-23 Magna Steyr Fahrzeugtechnik AG & Co KG Corps de mesure, capteur de mesure de force et agencement de mesure destinés à la mesure de forces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8909048U1 (de) 1989-07-26 1989-10-05 Dornier Gmbh, 7990 Friedrichshafen Kraftmeßsensor
WO1994007118A1 (fr) 1992-09-24 1994-03-31 Asea Brown Boveri Ab Tranducteur circulaire de force radiale
DE19960786A1 (de) 1999-12-16 2001-06-21 Schenck Process Gmbh Radialkraftaufnehmer
US20120266694A1 (en) 2009-12-08 2012-10-25 Abb Ag Multiaxial force-torque sensors
US20120234104A1 (en) 2011-03-15 2012-09-20 Deutsches Zentrum Fur Luft-Und Raumfahrt E.V. Force/moment sensor for measurment of forces and moments
EP2549253A1 (fr) * 2011-07-19 2013-01-23 Magna Steyr Fahrzeugtechnik AG & Co KG Corps de mesure, capteur de mesure de force et agencement de mesure destinés à la mesure de forces

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106644210A (zh) * 2015-10-30 2017-05-10 中石化石油工程技术服务有限公司 一种圆柱形工件测力装置
KR101900048B1 (ko) * 2017-08-25 2018-09-18 재단법인 대구경북과학기술원 힘센서 모듈

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