CN113686537B - Hybrid double-bridge data processing method based on sonic boom test external balance - Google Patents

Hybrid double-bridge data processing method based on sonic boom test external balance Download PDF

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CN113686537B
CN113686537B CN202111065713.2A CN202111065713A CN113686537B CN 113686537 B CN113686537 B CN 113686537B CN 202111065713 A CN202111065713 A CN 202111065713A CN 113686537 B CN113686537 B CN 113686537B
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moment
component
force
balance
load
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CN113686537A (en
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贾巍
钱丰学
高荣钊
杨洋
刘维亮
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High Speed Aerodynamics Research Institute of China Aerodynamics Research and Development Center
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
    • G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)

Abstract

The invention discloses a mixed double-bridge data processing method based on an external balance of a sonic boom test, which starts from the traditional double-bridge data processing method and comprises the following steps of: under the action of the force load, the signal output of the force element is normal, the signal output of the moment element is zero, and under the action of the moment load, the signal output of the moment element is normal, and the signal output of the force element is zero, so that the interference between the force element and the moment element is small, and the accurate measurement of a wind tunnel test is facilitated; according to the idea, the correction coefficient K is considered to be introduced, and reasonable data processing and iteration are carried out, so that the external balance can reasonably match the load in the calibration process, and under the action of single force/moment load, only the corresponding measuring unit has signal output, and the output of other measuring units is 0 or less, and therefore the problems that the force and moment load are not matched or the interference is large and the like in the calibration process of the external balance are solved.

Description

Hybrid double-bridge data processing method based on sonic boom test external balance
Technical Field
The invention relates to the field of aerodynamic force tests, in particular to a hybrid double-bridge data processing method based on an external balance of a sonic boom test, which is suitable for accurately measuring aerodynamic force data of a model sonic boom test in a sonic boom test of a supersonic aircraft.
Background
In recent years, with the increasing demand for supersonic transport, reconnaissance and early warning, people have generally noticed the value of supersonic transport, but the research on sonic boom technology is not deep enough, and the method is still in the exploration stage in the aspect of the most basic means, namely sonic boom test technology. In the research on sonic boom test technology, wind tunnel test plays a very important role. For a long time, the united states is the main force military for systematically developing sound explosion wind tunnel test technical researches in the world, the research result is one of the main sources for reference of all countries, and the maturity and reliability of the technical researches are urgently needed to be improved in China. Therefore, the Chinese aerodynamic research and development center develops deep research on the sonic boom testing technology. However, in the implementation process of the wind tunnel test, the balance required in the test research technology belongs to an external balance, the balance is positioned outside the model, and the phenomenon necessarily brings a longer force arm, so that the problem of mismatching of force and moment load is caused.
In the supersonic aircraft sonic boom wind tunnel test, two balance calibration modes are applied: one method is to determine the calibration center of the external balance at the center of a balance measuring element, and the method applies a large additional moment load in the calibration process, so that the method has the advantages that the interference of force to the moment is small when the data of the bridge is processed, but a correction link is added when the data is processed subsequently, namely the influence of correction quantity of delta L (the distance from the calibration center to the model pressure center); the other method is to determine the balance calibration center near the model pressure center, and because the moment reference point is near the pressure center, the method has the advantages that the moment load applied in the calibration process is small (the moment is small when the model is near the pressure center), but the moment load has larger signal output in the process of applying the force load, and the interference of the force to the moment component is larger in the data processing process. Therefore, when such balance calibration is performed, a new data processing method needs to be explored urgently.
Disclosure of Invention
The invention aims to solve the problem of large mutual interference among measurement elements in the calibration process of an external balance required by a sonic boom test.
In order to achieve the purpose, the invention adopts the following technical scheme:
a mixed double-bridge data processing method based on an external balance of a sonic boom test starts from a traditional double-bridge data processing method, and comprises the following steps of: under the action of the force load, the signal output of the force element is normal, the signal output of the moment element is zero, and under the action of the moment load, the signal output of the moment element is normal, and the signal output of the force element is zero, so that the interference between the force element and the moment element is small, and the accurate measurement of a wind tunnel test is facilitated; according to the idea, the correction coefficient K is considered to be introduced, and through reasonable data processing and iteration, the external balance can reasonably match the load in the calibration process, and under the action of a single force/moment load, only the corresponding measuring unit has signal output, and the output of other measuring units is 0 or less, so that the problems that the force and moment loads are not matched or the interference is large in the calibration process of the external balance are solved.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: by adopting the data processing method, the problem that the force and moment loads are not matched or greatly interfered in the calibration process of the external balance in the sonic boom wind tunnel test is solved, the accurate measurement of the balance is realized, and the accuracy of the wind tunnel force measurement test data is improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic illustration of a wind tunnel test scenario of the present invention;
FIGS. 2 and 3 are schematic diagrams illustrating the results of finite element analysis according to the present invention;
wherein: 1 is a reference model, 2 is an external balance, and 3 is a supporting mechanism.
Detailed description of the preferred embodiments
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The test scheme of the implementation of this embodiment includes participating in model 1, external balance 2 and supporting mechanism 3, and external balance is located participating in the model outside, selects the mode of single electric bridge group bridge to go on when carrying out the bridge group design. In the traditional prior art, two problems often occur, namely that if the balance calibration center is arranged at the center of a balance element, the additional moment is large, and if the balance calibration center is arranged near a pressure center, finite element analysis can show that when a force load is applied, the moment load has large signal output, and the interference of the force on the moment component is large during data processing.
In view of the above two problems, the present embodiment provides an improvement, and now considers that when the force load calibration is performed, the signal is introduced to correct the output signal of the torque element, so as to ensure that the main signal output of the torque element is close to 0 in this case, and when the measured torque value is corrected by the disturbance signal, so as to ensure that the torque output is 0 under the action of the force load, and the force load output is 0 under the action of the torque, so that the torque is normally output. The method specifically comprises the following steps:
firstly, after the external balance is processed, the resistance strain gauges are adhered to the measuring elements of the balance to form a Wheatstone full bridge to form a measuring circuit, and the adhesion modes of the resistance strain gauges of the balance are all performed by adopting the adhesion mode of a single bridge.
Secondly, a balance calibration center is arranged near a pressure center, meanwhile, a force load 1000N is applied to the pressure center, the signals at a rear end force element are normally output, the strain of a front end moment element reaches about 967 by utilizing the finite element analysis result as shown in figure 2, and the interference of the force to the moment is large. Under the action of moment design load, as shown in fig. 3, the front moment element strain is only about 230 (the force element strain is very small at this time), that is, if the problem is not dealt with, the disturbance output of the force to the moment is larger than the output of the main term of the moment, and the phenomenon should be avoided as much as possible when the balance is calibrated.
According to the finite element calculation result, introducing a correction coefficient K (a numerical value is determined according to an analysis result, and the K value is 3.78 according to the finite element analysis result in the test of the current period) as a force load correction coefficient of the main signal output, firstly correcting the main signal, and then correcting a measurement component corresponding to the main signal to be 0 through correction of an interference term in data iteration, wherein the formula summarized according to the signal processing method is as follows:
Figure SMS_1
wherein:
Figure SMS_11
in order to be the pitching moment,
Figure SMS_4
in order to be the yaw moment,
Figure SMS_7
outputs the amount of change in voltage for the pitching moment component,
Figure SMS_5
outputs the amount of change in voltage for the yaw moment component,
Figure SMS_9
outputs the amount of change in voltage for the normal force component,
Figure SMS_12
the amount of change in the voltage output for the lateral force component,
Figure SMS_15
for the (j) th load component,
Figure SMS_10
for the first load component of the first group,
Figure SMS_13
is composed of
Figure SMS_2
The coefficient of the main term of (a),
Figure SMS_6
is composed of
Figure SMS_14
The coefficient of the main term of (a),
Figure SMS_18
is the correction coefficient corresponding to Y, Y is the normal force,
Figure SMS_16
is the correction coefficient corresponding to Z, Z is the lateral force,
Figure SMS_19
is composed ofjThe first order interference coefficient of a component to an i component (where, when j = i, it is called the principal coefficient, i.e.
Figure SMS_3
、
Figure SMS_8
)，
Figure SMS_17
The quadratic interference coefficients of the j component and the l component to the i component are obtained.
And finally, in an actual operation link, checking the K value (K = 3.78) in the formula through balance calibration, and determining the coefficients of the main terms and the interference terms of other measurement elements.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims (2)

1. A mixed double-bridge data processing method based on a sonic boom test external balance is used for calibration of the external balance and data processing in a test process, the external balance in the test is positioned outside a test model, and the center of a balance element is far away from a pressure center position, and is characterized by comprising the following steps:
the method comprises the following steps: adhering a resistance strain gauge on a balance element to form a Wheatstone full bridge to form a measuring circuit;
step two: positioning a balance calibration center near a pressure center while applying a force load at the pressure center;
step three: according to the finite element calculation result, introducing a force load correction coefficient K of the main signal output, and correcting the main signal;
step four: correcting the measurement component corresponding to the main signal to be 0 through correction of an interference term in data iteration, and processing data according to the following formula:
Figure QLYQS_10
wherein:
Figure QLYQS_3
in order to be the pitching moment,
Figure QLYQS_6
in order to obtain a yaw moment,
Figure QLYQS_4
outputs the amount of change in voltage for the pitching moment component,
Figure QLYQS_7
outputs the amount of change in voltage for the yaw moment component,
Figure QLYQS_12
outputs the amount of change in voltage for the normal force component,
Figure QLYQS_15
the amount of change in the voltage output for the lateral force component,
Figure QLYQS_9
for the jth load component of the load,
Figure QLYQS_11
for the first load component of the first group,
Figure QLYQS_1
is composed of
Figure QLYQS_5
The coefficient of the main term of (a),
Figure QLYQS_14
is composed of
Figure QLYQS_18
The coefficient of the main term of (a),
Figure QLYQS_16
is the correction coefficient corresponding to Y, Y is the normal force,
Figure QLYQS_19
is the correction coefficient corresponding to Z, Z is the lateral force,
Figure QLYQS_2
is composed ofjFirst order interference coefficient of component to i component, wherein when j = i, it is called main term coefficient, i.e. the coefficient of the component is the sum of the first order interference coefficient and the second order interference coefficient
Figure QLYQS_8
、
Figure QLYQS_13
，
Figure QLYQS_17
The quadratic interference coefficients of the j component and the l component to the i component are obtained;
step five: and (4) checking the K value in the fourth step through balance calibration, and determining the main term and interference term coefficients of other measuring elements.
2. The hybrid double-bridge data processing method based on the sonic boom test external balance is characterized in that: when the main signal output of the moment element is near 0, the moment measurement value is corrected by using the interference signal, so that the moment output is 0 under the action of the force load, and the moment output is 0 under the action of the moment, and the moment is normally output.
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US5279144A (en) * 1991-04-28 1994-01-18 Israel Aircraft Industries Ltd. Internal balance calibration system and method
CN101726401A (en) * 2009-12-09 2010-06-09 中国航空工业第一集团公司沈阳空气动力研究所 Scale measuring device for pitching dynamic derivative experiment
CN103616157A (en) * 2013-12-23 2014-03-05 中国航天空气动力技术研究院 Wind-tunnel balance body shafting static correction system and wind-tunnel balance body shafting static correction method
CN104111138A (en) * 2014-04-30 2014-10-22 中国航天空气动力技术研究院 Large-scale missile engine six-component dynamometry and calibrating device
CN104990683A (en) * 2015-07-21 2015-10-21 中国空气动力研究与发展中心高速空气动力研究所 A segmented trace hinge moment balance
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CN106644367A (en) * 2017-01-13 2017-05-10 中国空气动力研究与发展中心高速空气动力研究所 Compound large-resistance wind-tunnel strain balance
CN106644365A (en) * 2016-12-29 2017-05-10 中国航天空气动力技术研究院 Low-speed wind tunnel thrust vector balance calibrating device
CN107462395A (en) * 2017-08-16 2017-12-12 中国空气动力研究与发展中心超高速空气动力研究所 Interference coefficient calibration method between a kind of balance component
CN108254126A (en) * 2018-02-06 2018-07-06 中国空气动力研究与发展中心超高速空气动力研究所 Aerodynamics force measurement balance simply loads calibrating installation
CN108507752A (en) * 2018-03-06 2018-09-07 中国空气动力研究与发展中心高速空气动力研究所 It is a kind of meter and pressure influence wind-tunnel balance band air bridges calibration method
CN111896216A (en) * 2020-07-16 2020-11-06 中国空气动力研究与发展中心高速空气动力研究所 Wind tunnel half-mode balance

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5279144A (en) * 1991-04-28 1994-01-18 Israel Aircraft Industries Ltd. Internal balance calibration system and method
CN101726401A (en) * 2009-12-09 2010-06-09 中国航空工业第一集团公司沈阳空气动力研究所 Scale measuring device for pitching dynamic derivative experiment
CN103616157A (en) * 2013-12-23 2014-03-05 中国航天空气动力技术研究院 Wind-tunnel balance body shafting static correction system and wind-tunnel balance body shafting static correction method
CN104111138A (en) * 2014-04-30 2014-10-22 中国航天空气动力技术研究院 Large-scale missile engine six-component dynamometry and calibrating device
CN104990683A (en) * 2015-07-21 2015-10-21 中国空气动力研究与发展中心高速空气动力研究所 A segmented trace hinge moment balance
CN106053008A (en) * 2016-05-13 2016-10-26 中国空气动力研究与发展中心高速空气动力研究所 Method for displaying balance reading in separate colors in wind tunnel test
CN106644365A (en) * 2016-12-29 2017-05-10 中国航天空气动力技术研究院 Low-speed wind tunnel thrust vector balance calibrating device
CN106644367A (en) * 2017-01-13 2017-05-10 中国空气动力研究与发展中心高速空气动力研究所 Compound large-resistance wind-tunnel strain balance
CN107462395A (en) * 2017-08-16 2017-12-12 中国空气动力研究与发展中心超高速空气动力研究所 Interference coefficient calibration method between a kind of balance component
CN108254126A (en) * 2018-02-06 2018-07-06 中国空气动力研究与发展中心超高速空气动力研究所 Aerodynamics force measurement balance simply loads calibrating installation
CN108507752A (en) * 2018-03-06 2018-09-07 中国空气动力研究与发展中心高速空气动力研究所 It is a kind of meter and pressure influence wind-tunnel balance band air bridges calibration method
CN111896216A (en) * 2020-07-16 2020-11-06 中国空气动力研究与发展中心高速空气动力研究所 Wind tunnel half-mode balance

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