CN204085784U - A kind of both-end calibrating installation - Google Patents
A kind of both-end calibrating installation Download PDFInfo
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- CN204085784U CN204085784U CN201420536746.XU CN201420536746U CN204085784U CN 204085784 U CN204085784 U CN 204085784U CN 201420536746 U CN201420536746 U CN 201420536746U CN 204085784 U CN204085784 U CN 204085784U
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Abstract
The utility model is a kind of both-end calibrating installation and calibration steps, belong to Aero-Space dynamometer check aerodynamics force measurement technical field, for for wind-tunnel pneumatic/dynamometer check of sports coupling research time, a kind of middle part of calibration is fixing, two ends both-end device for measuring force freely; Mainly comprise two covers " L " shape slide block and loading head, be used in conjunction with each other, wherein, " L " shape slide block one end is connected with front loading head, and the other end is connected with both-end device for measuring force front end, after " L " shape slide block, one end is connected with rear loading head afterwards, and the other end is connected with both-end device for measuring force rear end; Described loading head is four-point framework loading head, spatially non-interference, for applying longitudinal loading; Described " L " shape slide block is the web member between device for measuring force and loading head, spatially non-interference, and is provided with a pair longitudinal symmetrical Resistance-load point, for applying axial load.The utility model solves the calibration problem of both-end device for measuring force in special test, maximum adjustable six components, is a kind of extraordinary device for measuring force calibration program of simple possible really.
Description
Technical field
The utility model belongs to wind-tunnel aerodynamics force measurement device technique field, is specifically related to a kind of both-end calibrating installation and calibration steps.
Background technology
At present, need in extraordinary force test in wind tunnel to design special device for measuring force with the size of aerodynamic loading suffered by measurement model, direction and application point.Device for measuring force all needs before the test by calibrating installation imposed load, and according to the calibration of certain step method, to obtain the relational matrix of output signal and load, i.e. computing formula, and the composition error determining device for measuring force.
Conventional calibration cartridge be equipped with slide block type, telescopic two kinds, different with load according to the design feature of device for measuring force, general large load rod-type device for measuring force selects telescopic calibrating installation, and side crops industry device for measuring force selects slide block type calibrating installation.Extraordinary device for measuring force generally will design corresponding charger and explore corresponding new calibration steps, with satisfied test needs.Both-end device for measuring force for special test cannot complete calibration with existing calibrating installation and calibration steps, main cause to be this device for measuring force be fixing two ends, middle part special constructions freely, generic calibration device and calibration steps can only calibrate that one end is fixed, other end device for measuring force freely.
Utility model content
The utility model, in order to solve the static calibration problem of both-end device for measuring force, provides a kind of both-end calibrating installation and calibration steps.
Adopt following technical scheme for achieving the above object:
A kind of both-end calibrating installation, comprise the web member that two opposition are arranged, the upper end of each web member is provided with the connecting hole for fixing tested device, and web member upper end is provided with Resistance-load point for loading axial load; The lower end of each web member is provided with loading head, and the loading head of two web member lower end settings is spatially non-interference.
In technique scheme, the connecting hole symmetric coaxial on described two web members is arranged.
In technique scheme, the Resistance-load point on described two connecting holes is longitudinally symmetrical.
In technique scheme, described loading head is square, and each angle at four angles of loading head connects a loading disc by vertical connection lines.
In technique scheme, described two web members are " L " shape.
The utility model also provides a kind of calibration steps of both-end device for measuring force, and the method is:
The first step, fixes the adjustment level of tested both-end device for measuring force stiff end, installs the web member of two " L " shapes respectively, makes two links of tested both-end device for measuring force to be inserted in the connecting hole on web member;
Second step, the moment adjusting two loading heads respectively loads center, makes it overlap with two, the stiff end both sides electrical centre projection in the horizontal plane of both-end device for measuring force, connects all loading discs;
3rd step, wherein each loading disc repeatedly imposed load of a web member and loading head, gather the important voltage output value of both-end device for measuring force, calculates major event coefficient and distracter coefficient;
4th step, at each loading disc repeatedly imposed load of another web member and loading head, gathers the important voltage output value of both-end device for measuring force, calculates major event coefficient and distracter coefficient;
5th step, rotate around axial force direction respectively both-end device for measuring force 180 degree, 90 degree, 270 degree, repeat the first step, the 3rd step, the 4th step, calibrate the positive and negative direction of device for measuring force vertical and horizontal successively, the final voltage obtaining both-end device for measuring force exports the compute matrix with load relation;
6th step, the composition error of verification computation matrix, all load(ing) points load the inspection load of stochastic distribution by size repeatedly respectively at vertical and horizontal, error of calculation index, obtain both-end device for measuring force and measure accuracy.
In the above-mentioned methods, described second step and the 3rd step load separately the two ends of both-end device for measuring force successively, try to achieve the mutual interference coefficient in both-end device for measuring force two ends respectively.
In the above-mentioned methods, the 6th described step is all directions simultaneously loading both-end device for measuring force leading portion and back segment, to obtain the composition error of both-end device for measuring force.
In the above-mentioned methods, the calibration steps of described both-end device for measuring force adopts earth's axis system calibration steps.
The utility model has following characteristics:
1, both-end calibrating installation of the present utility model can realize the simulation loading of fixing two ends, middle part extraordinary device for measuring force freely, be applicable to play class model pneumatic/sports coupling dynamometry special test before the ground static calibration of device for measuring force.
2, breach conventional calibration device and can only calibrate that one end is stiff end, the other end is the device for measuring force of free end, adopt two cover loading heads with the use of, counterweight loads on time space does not interfere mutually.
3, both-end calibrating installation structure of the present utility model is simple, and utilize framed structure to optimize loss of weight, rigidity is lightweight greatly, has both been easy to processing and assembling, has turn reduced the impact of loading head weight on calibration result.
4, the calibration steps of both-end device for measuring force of the present utility model is simple, adopts the mode of single-ended calibration and both-end integrated correction, has utilization to obtain calibration calculations formula accurately.
Accompanying drawing explanation
The utility model illustrates by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the front view of both-end calibrating installation of the present utility model;
Fig. 2 is the vertical view of both-end calibrating installation of the present utility model.
In figure: 1 is both-end device for measuring force, 11 is leading portion electrical centres, and 12 is back segment electrical centres, and 13 is stiff ends, 21 be before " L " shape slide block, 22 is front loading heads, 31 be after " L " shape slide block, 32 is rear loading heads.
Embodiment
Fig. 1 is the front view of both-end calibrating installation of the present utility model, both-end calibrating installation described in the utility model, mainly comprises two covers " L " shape slide block and loading head, is used in conjunction with each other, wherein, " L " shape slide block one end is connected with front loading head, and the other end is connected with both-end device for measuring force front end; " L " shape slide block one end is connected with rear loading head afterwards, and the other end is connected with both-end device for measuring force rear end; Described " L " shape slide block is the web member between device for measuring force and loading head, and be provided with a pair longitudinal symmetrical Resistance-load point, this Resistance-load point, in the surface level at place, device for measuring force axial force direction, applies axial load by many groups pulley tangent with this surface level.
Fig. 2 is the vertical view of both-end calibrating installation of the present utility model, composition graphs 1, loading head described in the utility model is four-point framework loading head, adopts layout type one in front and one in back, one on the other, make loading code-disc spatially non-interference, be convenient to utilize standard test weight imposed load; Described both-end calibrating installation is longitudinally symmetrical, to reduce the mushing error that unsymmetric structure is introduced.
This example is calibrated to example with the both-end device for measuring force of four components (lift, pitching moment, side force and yawing, totally 8 groups of differential voltage output signals), and concrete implementation step is described:
(1) stiff end of both-end device for measuring force is fixed on calibrated mount, normal force positive dirction upwards, need if desired to be connected by suitable joint, ensure to connect reliably, make the axis of both-end device for measuring force in surface level by the optical instrument such as spirit-leveling instrument, inclinator, 8 of both-end device for measuring force groups of differential voltage output signals be connected with acquisition system, ensure that sense is consistent with the coordinate system direction of regulation, initial reading is stablized;
(2) before installing, " L " shape slide block and front loading head are to both-end device for measuring force front end, after installing, " L " shape slide block and rear loading head are to both-end device for measuring force rear end, longitudinally symmetrical load(ing) point is made to be in same level by the optical instrument such as spirit-leveling instrument, inclinator, namely there is not roll angle, Flange joint, screw are strained;
(3) by loading the distance of the method determination loading head center of moment skew electrical centre of lift and pitching moment, and adjust forward and backward loading head moment loading center accordingly respectively, its leading portion electrical centre with both-end device for measuring force and the projection in the horizontal plane of back segment electrical centre are overlapped, error is no more than 0.2mm, and measure the distance of forward and backward loading head center of moment distance both-end device for measuring force 1 end face respectively, as calibration center moment reference length;
(4) on four loading discs of front loading head, repeatedly apply step loading, gather the important voltage output value of both-end device for measuring force, calculate the leading portion major event coefficient of both-end device for measuring force and a distracter coefficient to back segment;
(5) on four loading discs of rear loading head, repeatedly apply step loading, gather the important voltage output value of both-end device for measuring force, calculate the back segment major event coefficient of both-end device for measuring force and a distracter coefficient to leading portion;
For four component force devices, often carry out the sing1e unit calibration of one-component, after utilizing least square fitting to calculate, the major event coefficient of current alignment component can be obtained and calibrate component to other seven groups of voltage signals interference coefficient.
(6) rotate around axial force direction respectively both-end device for measuring force 180 degree, 90 degree, 270 degree, repetition (1), (2), (4), (5) step, calibrate the longitudinal positive dirction of device for measuring force and horizontal positive and negative direction successively, each coefficient for positive negative direction adopts the method for average to obtain final coefficient.
The voltage of final acquisition both-end device for measuring force exports the compute matrix with load relation, as shown in table 1;
Certain four component both-end device for measuring force calibration formula of table 1
| ? | Y1 | Mz1 | Y2 | Mz2 | Z1 | My1 | Z2 | My2 |
| U-Uo | 173.65 | 3.6726 | 225.65 | 3.7278 | 368.61 | 1.5785 | 460.55 | 2.0101 |
| Y1 | - | 0.06499 | -0.07066 | -0.002546 | 0.08900 | -0.0002905 | 0.008688 | -9.185E-06 |
| Mz1 | -0.5318 | - | 0.7802 | 0.02520 | 0.1275 | 0.002553 | -0.09546 | -0.0005781 |
| Y2 | -0.07800 | 0.002433 | - | -0.06551 | 0.004347 | 9.010E-05 | 0.1303 | 0.0001293 |
| Mz2 | -0.7418 | 0.01740 | 1.272 | - | 0.5341 | -0.001773 | -0.1436 | 0.001574 |
| Z1 | 0.002940 | -0.0004797 | 0.004877 | 0.0002779 | - | -0.06683 | -0.06411 | 0.001789 |
| My1 | -0.1281 | -0.01732 | 0.002760 | 0.0003628 | -1.738 | - | -0.9222 | 0.02631 |
| Z2 | 0.002128 | -0.0001325 | 0.0007873 | -4.915E-05 | -0.03560 | -0.0005834 | - | 0.06717 |
| My2 | -0.02678 | 0.001074 | 0.2619 | -0.007292 | 0.6095 | 0.01209 | -2.7623 | - |
(7) composition error of verification computation matrix, all load(ing) points adopt orthogonal method to arrange 15 groups of inspection load, load respectively at vertical and horizontal and load by inspection load, the error calculating each component measurement value and load between counterweight, and the root mean square of the error of calculation, obtain both-end device for measuring force composite measurement error.
When wind tunnel test, each component calculates the aerodynamic resultant of forward and backward two segment models by following formula:
The Computing Principle of six component force devices of similar structures and step, with four component both-end device for measuring force in above-mentioned example, just do not describe one by one at this.
The technology that the unspecified part of the utility model is known to the skilled person.
The utility model is not limited to aforesaid embodiment.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (5)
1. a both-end calibrating installation, it is characterized in that the web member comprising two opposition settings, the upper end of each web member is provided with the connecting hole for fixing tested device, and web member upper end is provided with Resistance-load point for loading axial load; The lower end of each web member is provided with loading head, and the loading head of two web member lower end settings is spatially non-interference.
2. a kind of both-end calibrating installation according to claim 1, is characterized in that the connecting hole symmetric coaxial on described two web members is arranged.
3. a kind of both-end calibrating installation according to claim 1, is characterized in that the Resistance-load point of described two web member upper ends is longitudinally symmetrical.
4. a kind of both-end calibrating installation according to claim 1, is characterized in that described loading head is square, each angle at four angles of loading head connects a loading disc by vertical connection lines.
5. a kind of both-end calibrating installation according to claim 1, is characterized in that described two web members are " L " shape.
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| CN201420536746.XU CN204085784U (en) | 2014-09-18 | 2014-09-18 | A kind of both-end calibrating installation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198113A (en) * | 2014-09-18 | 2014-12-10 | 中国空气动力研究与发展中心高速空气动力研究所 | Double-end calibration device and calibration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198113A (en) * | 2014-09-18 | 2014-12-10 | 中国空气动力研究与发展中心高速空气动力研究所 | Double-end calibration device and calibration method |
| CN104198113B (en) * | 2014-09-18 | 2017-02-01 | 中国空气动力研究与发展中心高速空气动力研究所 | Double-end calibration device and calibration method |
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