CN217878268U - Six-component wind tunnel force balance - Google Patents
Six-component wind tunnel force balance Download PDFInfo
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- CN217878268U CN217878268U CN202222392278.0U CN202222392278U CN217878268U CN 217878268 U CN217878268 U CN 217878268U CN 202222392278 U CN202222392278 U CN 202222392278U CN 217878268 U CN217878268 U CN 217878268U
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Abstract
The utility model relates to a measuring instrument technical field especially relates to a six components wind-tunnel dynamometry balances, include: the device comprises a force measuring platform, a base and a plurality of strain sensors, wherein cavity structures are arranged in the middle of the force measuring platform and the base, the plurality of strain sensors are positioned between the force measuring platform and the base and are arranged in a centrosymmetric manner by taking the cavity structures as centers, and the strain sensors form a Wheatstone bridge and are used for sensing and outputting strain force values; the utility model discloses a set up the cavity structure in force measuring platform and base middle part, under the prerequisite that does not influence the installation and detect, greatly reduced six components wind-tunnel force measuring balance's weight to improve the natural frequency of six components wind-tunnel force measuring balance in the actual testing process, reduced resonance's emergence, thereby improved the stability of testing process, guaranteed the accuracy and the accuracy of testing result.
Description
Technical Field
The utility model relates to a measuring instrument technical field especially relates to a six components wind-tunnel dynamometry balances.
Background
Space any generalized force at a given seatThe system can be generally decomposed into six components, i.e., a vector component F of force along three coordinate axes x 、F y And F z And moment components M about three coordinate axes x 、M y And M z The force on a certain point on a research object can be always decomposed into the six components in a given coordinate system, and the six-component wind tunnel balance is used for simultaneously detecting and sensing the six components acting on the model in a wind tunnel force measurement experiment.
In the related technology, vibration is generated in the detection process, so that the six-component wind tunnel balance is easy to generate resonance phenomenon in the test process, errors are generated between the detection result and the actual result, the detection precision is difficult to achieve the expected effect, and real measurement data is difficult to obtain.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the six-component wind tunnel force measuring balance has high inherent frequency in the detection process, and the detection precision is ensured.
In order to achieve the purpose, the utility model adopts the technical proposal that: a six-component wind tunnel force balance comprising:
the device comprises a force measuring platform, a base and a plurality of strain sensors, wherein a cavity structure is arranged in the middle of the force measuring platform and the base, the plurality of strain sensors are positioned between the force measuring platform and the base and are arranged in a centrosymmetric manner by taking the cavity structure as a center, and the strain sensors form a Wheatstone bridge and are used for sensing and outputting strain force values.
Furthermore, the cavity structure comprises a middle part and four peripheral parts, the four peripheral parts are uniformly arranged around the middle part by taking the middle part as the center, and each four peripheral part and each strain sensor are arranged at intervals.
Further, the cross-section of the middle portion is circular.
Further, the cross-sectional shape of the intermediate portion is a quadrangle.
Furthermore, each of the four peripheral portions comprises a bonding edge and a connecting edge, the bonding edge is arranged close to the middle portion and has a radian consistent with that of the middle portion, and the connecting edge is connected with the bonding edge end to end.
Furthermore, the strain sensor comprises an elastic body, and two ends of the elastic body are respectively connected with the force measuring platform and two opposite side surfaces of the base.
Further, the elastic body comprises strain gauges and at least four strain beams, the strain beams are arranged in parallel, and the strain gauges are bonded to the strain beams.
Furthermore, the strain sensor is also provided with a cover, and the cover is wrapped outside the elastic body and used for protecting the strain beam and the strain sheet.
Furthermore, a plurality of mounting holes are formed in the force measuring platform, and the mounting holes are evenly distributed on one side, away from the strain sensor, of the force measuring platform.
Furthermore, the force measuring platform and the base are both provided with a positioning piece and a fastening piece, and each strain sensor is connected with the force measuring platform and the base through the positioning piece and the fastening piece.
The utility model has the advantages that: the utility model discloses a set up the cavity structure in force measuring platform and base middle part, under the prerequisite that does not influence the installation and detect, greatly reduced six components wind-tunnel force measuring balance's weight to improve the natural frequency of six components wind-tunnel force measuring balance in the actual testing process, reduced resonance's emergence, thereby improved the stability of testing process, guaranteed the accuracy and the accuracy of testing result.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a top view of a six-component wind tunnel force balance in an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken at B-B of FIG. 1;
FIGS. 4-7 are schematic views of different configurations of the cavity structure in the embodiment of the present invention;
fig. 8 is a front view of a strain sensor in an embodiment of the invention;
fig. 9 is a cross-sectional view at C-C in fig. 8.
Reference numerals: 01. a cavity structure; 011. an intermediate portion; 012. the periphery of the body; 012a, a joint edge; 012b, a connecting edge; 02. mounting holes; 03. a positioning member; 04. a fastener; 10. a force measuring platform; 20. a base; 30. a strain sensor; 31. an elastomer; 31a, a strain gauge; 31b, a strain beam; 32. and (4) a housing.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The six-component wind tunnel load cell balance as shown in fig. 1 to 9 comprises:
the force measuring device comprises a force measuring platform 10, a base 20 and a plurality of strain sensors 30, wherein cavity structures 01 are arranged in the middle of the force measuring platform 10 and the base 20, the plurality of strain sensors 30 are located between the force measuring platform 10 and the base 20 and are arranged in a centrosymmetric mode by taking the cavity structures 01 as centers, and the strain sensors 30 form a Wheatstone bridge and are used for sensing and outputting strain force values.
Here, a plurality of mounting holes 02 are provided on the force-measuring platform 10, the mounting holes 02 being evenly distributed on a side of the force-measuring platform 10 facing away from the strain sensor 30; the object to be measured can be fixed on the force measuring platform 10 through the mounting holes 02, and the stability of connection can be guaranteed through the arrangement of the mounting holes 02.
In addition, all be equipped with setting element 03 and fastener 04 on force measuring platform 10 and the base 20, each strain sensor 30 all is connected with force measuring platform 10 and base 20 through setting element 03 and fastener 04, setting element 03 can guarantee force measuring platform 10, the accuracy of relative position between base 20 and the strain sensor 30, fastener 04 can guarantee the stability of connecting between, relative movement can not appear in the testing process, and simultaneously, also be equipped with fastener 04 on setting element 03, be used for pressing from both sides tight setting element 03, wherein setting element 03 can be structure such as locating pin, fastener 04 can be screw, bolt isotructure, do not specifically prescribe a limit here, can realize the effect of location and connection can.
By arranging the cavity structure 01 in the middle of the force measuring platform 10 and the base 20, the weight of the six-component wind tunnel force measuring balance is greatly reduced on the premise of not influencing installation and detection, so that the natural frequency of the six-component wind tunnel force measuring balance in the actual detection process is improved, the occurrence of resonance phenomenon is reduced, the stability of the detection process is improved, and the accuracy and precision of the detection result are ensured.
It should be noted that natural frequency is also called natural frequency, and when the object does free vibration, its displacement changes according to sine or cosine law with time, and the frequency of vibration is only relevant with the inherent characteristic of system (such as quality, shape, material, etc.), the utility model discloses in, through the form that sets up cavity structure 01, under the connection that does not influence strain transducer 30 and six components wind-tunnel dynamometry balances and the fixed prerequisite of being tested object, can greatly reduced holistic weight, and natural frequency is inversely proportional to weight, consequently, six components wind-tunnel dynamometry balances's natural frequency obtains improving, and then the stability of testing process obtains improving.
Specifically, the cavity structure 01 includes a middle portion 011 and four peripheral portions 012, the four peripheral portions 012 are uniformly arranged around the middle portion 011 with the middle portion 011 as a center, and each four peripheral portion 012 is arranged at an interval with each strain sensor 30, that is, a positional relationship between every two strain sensors 30 and the four peripheral portions 012 is formed, so that the volume of the cavity structure 01 is enlarged as much as possible, and the weight of the force measuring platform 10 and the base 20 can be reduced.
Of course, in order to ensure the connection performance and the support performance of the force measuring platform 10 and the base 20, prevent the bending deformation during the test process, and affect the test accuracy, the cavity structure 01 is not set to be a through mode, and only extends from any side of the force measuring platform 10 and the base 20 to the other side, so as to form the cavity structure 01 with a certain depth, wherein each four peripheral parts 012 includes an attaching edge 012a and a connecting edge 012b, the attaching edge 012a is set near the middle 011 and is consistent with the relative position radian of the middle 011, the connecting edge 012b is connected with the attaching edge 012a end to end, the form of the connecting edge 012b is not limited here, and the selection is suitable according to the actual situation.
The arrangement of the cavity structure 01 is exemplified below, but of course in some other embodiments of the invention, other arrangements exist than the arrangement set forth below alone, without specific limitations on the shape.
As an arrangement form, the cross section of the middle portion 011 is circular, the attaching sides 012a are arc-shaped and have the same radian as the middle portion 011, and the connecting sides 012b may be arc-shaped or formed by connecting multiple straight sides, so that the four peripheral portions 012 form a crescent structure or a concave structure; as another arrangement, the cross-sectional shape of the intermediate portion 011 is a quadrangle, the attached side 012a is a straight side that coincides with the corresponding side, and the connecting side 012b may be formed in an arc shape or a polygonal connection, so that the four peripheral portions 012 have a semicircular structure or a quadrangular structure.
Wherein, the strain sensor 30 comprises an elastic body 31, and two ends of the elastic body 31 are respectively connected with two opposite side surfaces of the force measuring platform 10 and the base 20; specifically, the elastic body 31 includes a strain gauge 31a and at least four strain beams 31b, the strain beams 31b are arranged in parallel, the strain gauge 31a is adhered to the strain beam 31b, and the adhesion form of the strain gauge 31a can be changed according to different objects to be tested and test requirements, so as to realize conversion between the strain amount and the resistance of the strain beam 31 b.
In addition, the strain sensor 30 is further provided with a cover 32, and the cover 32 is wrapped outside the elastic body 31 and used for protecting the strain beam 31b and the strain sheet 31a and preventing the external environment corresponding variable and the strain sheet 31a from generating interference, which causes deviation of the detection result.
The utility model discloses a six component wind-tunnel dynamometry balance working process as follows: fix the testee through mounting hole 02 force measuring platform 10 top, when the testee atress, elastic body 31 all can atress elastic deformation in each strain sensor 30 for strain beam 31b produces the dependent variable, pastes the foil gage 31a on strain beam 31b and converts the atress size of testee into resistance change by the dependent variable, and resistance change is converted into pressure output through the wheatstone bridge again, obtains the test result of six components of testee through the processing of data.
It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A six-component wind tunnel force balance is characterized by comprising:
the device comprises a force measuring platform, a base and a plurality of strain sensors, wherein a cavity structure is arranged in the middle of the force measuring platform and the base, the plurality of strain sensors are positioned between the force measuring platform and the base and are arranged in a centrosymmetric manner by taking the cavity structure as a center, and the strain sensors form a Wheatstone bridge and are used for sensing and outputting strain force values.
2. The six-component wind tunnel force balance of claim 1, wherein said cavity structure comprises a central portion and four peripheral portions, said four peripheral portions being centered about said central portion and disposed evenly around said central portion, and each of said four peripheral portions being spaced from each of said strain sensors.
3. The six-component wind tunnel force balance according to claim 2, wherein said middle portion is circular in cross-section.
4. The six-component wind tunnel force balance of claim 2, wherein the cross-sectional shape of said intermediate portion is quadrilateral.
5. The six-component wind tunnel force balance according to claim 3 or 4, wherein each of the four peripheral portions comprises an attaching edge and a connecting edge, the attaching edge is arranged close to the middle portion and has a radian consistent with a relative position of the middle portion, and the connecting edge is connected with the attaching edge end to end.
6. The six-component wind tunnel force balance according to claim 1, wherein the strain sensor comprises an elastomer, and two ends of the elastomer are respectively connected to two opposite side surfaces of the force measuring platform and the base.
7. The six-component wind tunnel force balance according to claim 6, wherein said elastomer comprises strain gages and at least four strain beams, said strain beams being arranged parallel to each other, said strain gages being bonded to said strain beams.
8. The six-component wind tunnel force balance according to claim 7, wherein said strain sensor further comprises a cover, said cover surrounding said elastomer for protecting said strain beam and said strain gauge.
9. The six-component wind tunnel force balance according to claim 1, wherein a plurality of mounting holes are provided on the force-measuring platform, and the mounting holes are evenly distributed on a side of the force-measuring platform away from the strain sensor.
10. The six-component wind tunnel force balance according to claim 9, wherein each of the force-measuring platform and the base is provided with a positioning member and a fastening member, and each of the strain sensors is connected to the force-measuring platform and the base through the positioning member and the fastening member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222392278.0U CN217878268U (en) | 2022-09-08 | 2022-09-08 | Six-component wind tunnel force balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222392278.0U CN217878268U (en) | 2022-09-08 | 2022-09-08 | Six-component wind tunnel force balance |
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| Publication Number | Publication Date |
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| CN217878268U true CN217878268U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222392278.0U Active CN217878268U (en) | 2022-09-08 | 2022-09-08 | Six-component wind tunnel force balance |
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| CN (1) | CN217878268U (en) |
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- 2022-09-08 CN CN202222392278.0U patent/CN217878268U/en active Active
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