CN108507753B - Output signal combination method of three-component optical fiber balance - Google Patents

Output signal combination method of three-component optical fiber balance Download PDF

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CN108507753B
CN108507753B CN201810305729.8A CN201810305729A CN108507753B CN 108507753 B CN108507753 B CN 108507753B CN 201810305729 A CN201810305729 A CN 201810305729A CN 108507753 B CN108507753 B CN 108507753B
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strain
fiber
epsilon
output value
column
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CN108507753A (en
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闵夫
戴金雯
杨彦广
邱华诚
李绪国
皮兴才
刘志强
冯双
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Ultra High Speed Aerodynamics Institute China Aerodynamics Research and Development Center
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Ultra High Speed Aerodynamics Institute China Aerodynamics Research and Development Center
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/06Measuring arrangements specially adapted for aerodynamic testing
    • G01M9/062Wind tunnel balances; Holding devices combined with measuring arrangements

Abstract

The invention discloses an output signal combination method of a three-component optical fiber balance, which comprises the following steps: the device comprises a model connecting end, a first single-column beam, an axial force element, a second single-column beam, a supporting rod and a bracket connecting end which are sequentially arranged, wherein an optical fiber strain gauge is arranged on a measuring beam of the axial force element, the first single-column beam and the second single-column beam; the first single-column beam and the second single-column beam jointly form a normal force/pitching moment combined element; wherein, the signal output value of the normal force component of the three-component fiber balance is: the sum of the output value of the optical fiber strain gauge on the first single-column beam and the output value of the optical fiber strain gauge on the second single-column beam; the signal output values of the pitching moment components of the three-component optical fiber balance are as follows: the sum of the output value of the optical fiber strain gauge on the first single-column beam and the output value of the optical fiber strain gauge on the second single-column beam; the signal output values of the axial force components of the three-component optical fiber balance are as follows: the output of the fiber optic strain gauge on the axial force element.

Description

Output signal combination method of three-component optical fiber balance
Technical Field
The invention belongs to the technical field of aerospace force measurement tests, and particularly relates to an output signal combination method of a three-component optical fiber balance.
Background
The optical fiber strain gauge has the advantages of electromagnetic interference resistance, corrosion resistance, high measurement sensitivity, good real-time property, stability, reliability, simple structure and the like, and provides a new technical approach for the development of the wind tunnel strain balance. At present, the research of the optical fiber balance is still in the feasibility verification stage of wind tunnel test application, the work of the optical fiber strain gauge selection, the balance structure optimization design and the like is mainly carried out, and the research of the signal processing method of the optical fiber balance is less. At present, a wheatstone bridge method similar to a resistance balance is still adopted for processing signals of the optical fiber balance, namely, after the optical fiber strain gauges are installed at symmetrical positions, output signals of the optical fiber strain gauges are combined and calculated. The combination mode of the Wheatstone bridge needs more optical fiber strain gauges, for example, a three-component balance needs at least 8 optical fiber strain gauges, a 6-component balance needs at least 16 optical fiber strain gauges, a traditional three-component optical fiber balance needs 8 optical fiber strain gauges, and the installation positions of the optical fiber strain gauges are shown in FIG. 3. 4 strain gauges are installed on the normal force/pitching moment combined element, and a strain gauge 21, a strain gauge 22, a strain gauge 23 and a strain gauge 24 are symmetrically installed on two sides of the single column beam 2 and the single column beam 4 respectively; 4 strain gauges are arranged on the axial force element, and a strain gauge 25, a strain gauge 26, a strain gauge 27 and a strain gauge 28 are respectively arranged at symmetrical positions of a measuring beam; under the action of normal force, pitching moment and axial force load, the balance measuring element deforms, and the strain results of different optical fiber strain gauges in mounting positions are shown in table 1.
Table 1: strain of mounting position of optical fiber strain gauge under action of each component load
Balance weight 21 22 23 24 25 26 27 28
Normal force Fy (+) Fy Fy Fy Fy
Pitching moment Mz (+) Mz Mz Mz Mz
Axial force Fx (+) Fx Fx Fx Fx
Thus, the conventional three-component fiber balance has a component combination formula as follows:
UFy=(-U21+U22)+(-U23+U24)
UMz=(U21-U22)+(-U23+U24)
UFx=(U25-U27)+(U26-U28)
since the output signal of each fiber strain gauge is related to at least one or more component loads of the balance, at least 3 fiber strain gauges are required to meet the measurement requirements of the three-component balance.
The resistance strain gauges on the resistance balance are usually installed at symmetrical positions of the measuring element, and the relationship between the voltage signal of the bridge and the strain of the measuring element of the balance is obtained by combining four or eight strain gauges into a Wheatstone bridge. The optical fiber strain gauge can directly obtain optical signals of wavelength, phase and the like, and the relationship between the optical signals of wavelength, phase and the like and the strain of the balance measuring element can be established without forming a Wheatstone bridge. Therefore, the number of optical fiber strain gauges required by the optical fiber balance is less than that of the resistance strain gauges required by the resistance balance to realize the measurement of the balance.
During the installation process of the optical fiber strain gauge of the optical fiber balance, the more strain gauges are used, the higher the cost is, and the longer the installation period is. Therefore, it is important to reduce the number of fiber strain gauges used in a fiber optic balance.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided an output signal combining method of a three-component fiber optic balance, characterized in that the three-component fiber optic balance includes: the device comprises a model connecting end, a first single-column beam, an axial force element, a second single-column beam, a support rod and a support connecting end which are sequentially arranged, wherein an optical fiber strain gauge is arranged on a measuring beam of the axial force element, the first single-column beam and the second single-column beam; the first single-column beam and the second single-column beam jointly form a normal force/pitching moment combined element;
wherein, the signal output value of the normal force component of the three-component fiber balance is as follows: the sum of the output value of the optical fiber strain gauge on the first single-column beam and the output value of the optical fiber strain gauge on the second single-column beam;
the signal output values of the pitching moment components of the three-component optical fiber balance are as follows: the sum of the output value of the optical fiber strain gauge on the first single-column beam and the output value of the optical fiber strain gauge on the second single-column beam;
the signal output values of the axial force components of the three-component optical fiber balance are as follows: the output of the fiber optic strain gauge on the axial force element.
Preferably, when the optical fiber strain gauge on the measuring beam of the axial force element is located on the upper end side of the measuring beam, the optical fiber strain gauge on the measuring beam of the axial force element senses positive strain + eFxThe output value is U.
Preferably, when the optical fiber strain gauge on the measuring beam of the axial force element is located on the lower end side of the measuring beam, the optical fiber strain gauge on the measuring beam of the axial force element senses a negative strain-epsilonFxThe output value is-U.
Preferably, the optical fibre strain gauges on the first single beam sense a negative strain-epsilon under normal load Fy when the optical fibre strain gauges on both the first and second single beams are on the same sideFyOr positive strain + εFyThe optical fiber strain gauge on the second single column beam senses positive strain + epsilonFyOr negative strain-epsilonFyThe signal output value of the normal force component of the three-component fiber balance is UFy=-U21+U24Or UFy=U22+(-U23) (ii) a Wherein, -U21Sensing negative strain-epsilon for fiber strain gauges on a first single beamFyAn output value of time; u shape24Sensing positive strain + epsilon for fiber strain gauges on a second single beamFyAn output value of time; u shape22Sensing positive strain + epsilon for fiber strain gauges on a first single beamFyAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauges on a second single beamFyThe output value of time.
Preferably, the optical fibre strain gauges on the first single beam sense a positive strain epsilon under the action of the pitching moment Mz when the optical fibre strain gauges on the first and second single beams are both on the same sideMzOr negative strain-epsilonMzThe optical fiber strain gauge on the second single beam senses negative strain-epsilonMzOr positive strain epsilonMzThe signal output value U of the pitching moment component of the three-component optical fiber balanceMz=U21+U24Or UMz=-U22+(-U23);U21Sensing positive strain epsilon for fiber strain gauges on a first single beamMzAn output value of time; u shape24Sensing positive strain epsilon for fiber strain gauges on a second single beamMzAn output value of time; -U22Sensing negative strain-epsilon for fiber strain gauges on a first single beamMzAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauge on second single column beamMzThe output value of time.
Preferably, the optical fibre strain gauges on the first single beam sense a negative strain-epsilon under normal load Fy when they are both on different sidesFyOr positive strain + εFyThe optical fiber strain gauge on the second single column beam senses positive strain + epsilonFyOr negative strain-epsilonFyThe signal output value of the normal force component of the three-component fiber balance is UFy=-U21+(-U23) Or UFy=U22+U24(ii) a Wherein, -U21Sensing negative strain-epsilon for fiber strain gauges on a first single beamFyAn output value of time; u shape24Sensing positive strain + epsilon for fiber strain gauges on a second single beamFyAn output value of time; u shape22Sensing positive strain + epsilon for fiber strain gauges on a first single beamFyAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauges on a second single beamFyAn output value of time;
preferably, the fiber strain gauges on the first single beam sense a positive strain epsilon under the action of the pitching moment Mz when the fiber strain gauges on the first and second single beams are both on different sidesMzOr negative strain-epsilonMzThe optical fiber strain gauge on the second single beam senses negative strain-epsilonMzOr positive strain epsilonMzThe signal output value U of the pitching moment component of the three-component optical fiber balanceMz=U21+(-U23) Or UMz=-U22+U24);U21Sensing positive strain epsilon for fiber strain gauges on a first single beamMzAn output value of time; u shape24Sensing positive strain epsilon for fiber strain gauges on a second single beamMzAn output value of time; -U22Sensing negative strain-epsilon for fiber strain gauges on a first single beamMzAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauge on second single column beamMzThe output value of time.
The invention at least comprises the following beneficial effects: by adopting the method, the accurate measurement of the load of the three-component balance is realized through the three optical fiber strain gauges, the use number of the optical fiber strain gauges of the three-component optical fiber balance can be reduced by adopting the combination scheme, the cost is reduced, and the installation period is shortened.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Description of the drawings:
FIG. 1 is a schematic perspective view of a three-component fiber balance according to the present invention;
FIG. 2 is a schematic plane structure diagram of a three-component fiber balance according to the present invention;
FIG. 3 is a schematic view of a mounting structure of a fiber strain gauge of a prior art three-component fiber optic balance;
FIG. 4 is a schematic view of the mounting structure of the fiber strain gauge of the three-component fiber balance according to the present invention;
FIG. 5 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 6 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 7 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 8 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 9 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 10 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 11 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 12 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 13 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 14 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 15 is a schematic view of another mounting structure of a fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 16 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 17 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 18 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 19 is a schematic view of another mounting structure of the fiber strain gauge of the three-component fiber optic balance of the present invention;
FIG. 20 shows the HB-2 axial force coefficients Ca of case one, case two, and case three in accordance with certain embodiments of the invention;
FIG. 21 shows the HB-2 normal force coefficients Cn for case one, case two, and case three, in accordance with embodiments of the invention.
The specific implementation mode is as follows:
the present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1 and 2, the output signal combination method of a three-component optical fiber balance of the present invention includes: the device comprises a model connecting end 1, a first single-column beam 2, an axial force element 3, a second single-column beam 4, a support rod 5 and a bracket connecting end 6 which are sequentially arranged, wherein an optical fiber strain gauge (any one of 25, 26, 27 and 28), (21 or 22), (23 or 24) is arranged on a measuring beam of the axial force element 3, the first single-column beam 2 and the second single-column beam 4; the first single column beam 2 and the second single column beam 4 jointly form a normal force/pitching moment combined element;
wherein, the signal output value of the normal force component of the three-component fiber balance is as follows: the sum of the output value of the optical fiber strain gauge on the first single-column beam and the output value of the optical fiber strain gauge on the second single-column beam;
the signal output values of the pitching moment components of the three-component optical fiber balance are as follows: the sum of the output value of the optical fiber strain gauge on the first single-column beam and the output value of the optical fiber strain gauge on the second single-column beam;
the signal output values of the axial force components of the three-component optical fiber balance are as follows: the output of the fiber optic strain gauge on the axial force element.
In the above technical solution, when the fiber strain gauge on the measuring beam of the axial force element is located on the upper end side of the measuring beam: (As shown at 25, 26 in fig. 4, 5, 6, 9, 12, 13, 16, 17), the positive strain + epsilon experienced by the fiber strain gage on the measurement beam of the axial force elementFxThe output value is U25Or U26
In the solution described above, when the fibre-optic strain gauges on the measuring beam of the axial force element are located on the lower end side of the measuring beam (as shown in 27, 28 in fig. 7, 8, 10, 11, 14, 15, 18, 19), the fibre-optic strain gauges on the measuring beam of the axial force element experience a negative strain-epsilonFxThe output value is-U27or-U28
In the above solution, when the fiber strain gauges on the first and second single-column beams are both located on the same side (as shown in fig. 4, 9, 10, 11, 12, 13, 14, 15 at 21 and 24, 22 and 23), the fiber strain gauge on the first single-column beam experiences negative strain-epsilon under normal load FyFyOr positive strain + εFyThe optical fiber strain gauge on the second single column beam senses positive strain + epsilonFyOr negative strain-epsilonFyThe signal output value of the normal force component of the three-component fiber balance is UFy=-U21+U24Or UFy=U22+(-U23) (ii) a Wherein, -U21Sensing negative strain-epsilon for fiber strain gauges on a first single beamFyAn output value of time; u shape24Sensing positive strain + epsilon for fiber strain gauges on a second single beamFyAn output value of time; u shape22Sensing positive strain + epsilon for fiber strain gauges on a first single beamFyAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauges on a second single beamFyAn output value of time;
in the above solution, when the fiber strain gauges on the first and second single-column beams are both located on the same side (as shown in fig. 4, 9, 10, 11, 12, 13, 14, 15 at 21 and 24, 22 and 23), the fiber strain gauge on the first single-column beam senses positive strain ∈ under the action of the pitching moment MzMzOr negative strain-epsilonMzThe optical fiber strain gauge on the second single beam senses negative strain-epsilonMzOr is turningStrain epsilonMzThe signal output value U of the pitching moment component of the three-component optical fiber balanceMz=U21+U24Or UMz=-U22+(-U23);U21Sensing positive strain epsilon for fiber strain gauges on a first single beamMzAn output value of time; u shape24Sensing positive strain epsilon for fiber strain gauges on a second single beamMzAn output value of time; -U22Sensing negative strain-epsilon for fiber strain gauges on a first single beamMzAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauge on second single column beamMzThe output value of time.
In the above solution, when the fiber strain gauges on the first and second single-column beams are both located on different sides, as shown in fig. 5, 6, 7, 8, 16, 17, 18, 19 at 22 and 24, 21 and 23), wherein the fiber strain gauge on the first single-column beam experiences a negative strain-epsilon under the normal load Fy)FyOr positive strain + εFyThe optical fiber strain gauge on the second single column beam senses positive strain + epsilonFyOr negative strain-epsilonFyThe signal output value of the normal force component of the three-component fiber balance is UFy=-U21+(-U23) Or UFy=U22+U24(ii) a Wherein, -U21Sensing negative strain-epsilon for fiber strain gauges on a first single beamFyAn output value of time; u shape24Sensing positive strain + epsilon for fiber strain gauges on a second single beamFyAn output value of time; u shape22Sensing positive strain + epsilon for fiber strain gauges on a first single beamFyAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauges on a second single beamFyAn output value of time;
in the above solution, when the fiber strain gauges on the first and second single-column beams are both located on different sides (as shown in 22 and 24, 21 and 23 in fig. 5, 6, 7, 8, 16, 17, 18, 19), the fiber strain gauge on the first single-column beam experiences a positive strain ∈ under the action of the pitch moment MzMzOr negative strain-epsilonMzLight on the second single beamThe fiber strain gauge senses negative strain-epsilonMzOr positive strain epsilonMzThe signal output value U of the pitching moment component of the three-component optical fiber balanceMz=U21+(-U23) Or UMz=-U22+U24);U21Sensing positive strain epsilon for fiber strain gauges on a first single beamMzAn output value of time; u shape24Sensing positive strain epsilon for fiber strain gauges on a second single beamMzAn output value of time; -U22Sensing negative strain-epsilon for fiber strain gauges on a first single beamMzAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauge on second single column beamMzThe output value of time.
Taking the mode in fig. 4 as a first scheme, the combined formula of the first scheme of the 3 optical fiber strain gauges of the three-component optical fiber balance is as follows:
UFy=-U21+U24
UMz=U21+U24
UFx=U26
taking the mode in fig. 5 as a scheme two, the combined formula of the scheme two of the 3 optical fiber strain gauges of the three-component optical fiber balance is as follows:
UFy=-U21-U23
UMz=U21-U23
UFx=U26
in order to verify the feasibility of the two schemes and compare the balance performances of the combination of 8 optical fiber strain gauges and the balance performance of the combination of 3 optical fiber strain gauges, the three-component optical fiber balance is actually provided with 8 optical fiber strain gauges, and the three-component balance is subjected to static calibration and HB-2 standard model wind tunnel test, and the results are shown in Table 2, FIG. 20 and FIG. 21. For more specific description, the first scheme of the three-component optical fiber balance 3 optical fiber strain gauges is referred to as the first scheme, the second scheme of the three-component optical fiber balance 3 optical fiber strain gauges is referred to as the second scheme, and the third scheme of the three-component optical fiber balance 8 optical fiber strain gauges is referred to as the third scheme.
TABLE 2 balance static calibration accuracy
Normal force Fy Pitching moment Mz (+) Axial force Fx (+)
Scheme one 0.27% 0.28% 0.27%
Scheme two 0.34% 0.27% 0.27%
Scheme three 0.21% 0.14% 0.23%
From the test results (table 2, fig. 20 and 21), the differences between the first, second and third solutions were small in terms of balance calibration accuracy and aerodynamic coefficient of wind tunnel test. Namely, the three optical fiber strain gauges can realize accurate measurement of the load of the three-component balance, and the use number of the optical fiber strain gauges of the three-component optical fiber balance can be reduced by adopting the combination scheme.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (5)

1. A method of combining output signals of a three-component fiber optic balance, the three-component fiber optic balance comprising: the device comprises a model connecting end, a first single-column beam, an axial force element, a second single-column beam, a support rod and a support connecting end which are sequentially arranged, wherein an optical fiber strain gauge is arranged on a measuring beam of the axial force element, the first single-column beam and the second single-column beam; the first single-column beam and the second single-column beam jointly form a normal force/pitching moment combined element;
when the optical fiber strain gauges on the first single-column beam and the second single-column beam are positioned on the same side, under the action of a normal load Fy, the optical fiber strain gauges on the first single-column beam sense negative strain-epsilonFyOr positive strain + εFyThe optical fiber strain gauge on the second single column beam senses positive strain + epsilonFyOr negative strain-epsilonFyThe signal output value of the normal force component of the three-component fiber balance is UFy=-U21+U24Or UFy=U22+(-U23) (ii) a Wherein, -U21Sensing negative strain-epsilon for fiber strain gauges on a first single beamFyAn output value of time; u shape24Sensing positive strain + epsilon for fiber strain gauges on a second single beamFyAn output value of time; u shape22Sensing positive strain + epsilon for fiber strain gauges on a first single beamFyAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauges on a second single beamFyAn output value of time;
when the optical fiber strain gauges on the first single-column beam and the second single-column beam are both positioned on the same side, the optical fiber strain gauges on the first single-column beam sense positive strain epsilon under the action of pitching moment MzMzOr negative strain-epsilonMzSaid second single column beamUpper optical fibre strain gauge sensing negative strain-epsilonMzOr positive strain epsilonMzThe signal output value U of the pitching moment component of the three-component optical fiber balanceMz=U21+U24Or UMz=-U22+(-U23);U21Sensing positive strain epsilon for fiber strain gauges on a first single beamMzAn output value of time; u shape24Sensing positive strain epsilon for fiber strain gauges on a second single beamMzAn output value of time; -U22Sensing negative strain-epsilon for fiber strain gauges on a first single beamMzAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauge on second single column beamMzAn output value of time;
the signal output values of the axial force components of the three-component optical fiber balance are as follows: the output of the fiber optic strain gauge on the axial force element.
2. The method for combining the output signals of a three-component fiber-optic balance according to claim 1, wherein the fiber-optic strain gauges on the measuring beam of the axial force element are disposed on the upper end side of the measuring beam, and the fiber-optic strain gauges on the measuring beam of the axial force element sense positive strain + eFxThe output value is U.
3. The method for combining the output signals of a three-component fiber-optic balance according to claim 1, wherein the fiber-optic strain gauges on the measuring beam of the axial force element are subjected to a negative strain-s when the fiber-optic strain gauges on the measuring beam of the axial force element are positioned on the lower end side of the measuring beamFxThe output value is-U.
4. The method according to claim 1, wherein the fiber strain gauges on the first single beam are subjected to a negative strain-epsilon under a normal load Fy when the fiber strain gauges on the first and second single beams are on different sidesFyOr positive strain + εFyThe optical fiber strain gauge on the second single column beam senses positive strain + epsilonFyOr negative strain-epsilonFyThe signal output value of the normal force component of the three-component fiber balance is UFy=-U21+(-U23) Or UFy=U22+U24(ii) a Wherein, -U21Sensing negative strain-epsilon for fiber strain gauges on a first single beamFyAn output value of time; u shape24Sensing positive strain + epsilon for fiber strain gauges on a second single beamFyAn output value of time; u shape22Sensing positive strain + epsilon for fiber strain gauges on a first single beamFyAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauges on a second single beamFyThe output value of time.
5. The method according to claim 1, wherein the fiber strain gauges on the first single beam sense a positive strain ε under a pitching moment Mz when the fiber strain gauges on the first and second single beams are on different sidesMzOr negative strain-epsilonMzThe optical fiber strain gauge on the second single beam senses negative strain-epsilonMzOr positive strain epsilonMzThe signal output value U of the pitching moment component of the three-component optical fiber balanceMz=U21+(-U23) Or UMz=-U22+U24);U21Sensing positive strain epsilon for fiber strain gauges on a first single beamMzAn output value of time; u shape24Sensing positive strain epsilon for fiber strain gauges on a second single beamMzAn output value of time; -U22Sensing negative strain-epsilon for fiber strain gauges on a first single beamMzAn output value of time; -U23Sensing negative strain-epsilon for fiber strain gauge on second single column beamMzThe output value of time.
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