CN116067607B - Flat plate automatic calibration system for wind tunnel - Google Patents
Flat plate automatic calibration system for wind tunnel Download PDFInfo
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- CN116067607B CN116067607B CN202310243219.3A CN202310243219A CN116067607B CN 116067607 B CN116067607 B CN 116067607B CN 202310243219 A CN202310243219 A CN 202310243219A CN 116067607 B CN116067607 B CN 116067607B
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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
- G01M9/02—Wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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Abstract
The invention discloses a flat plate automatic calibration system for a wind tunnel, which relates to the field of wind tunnel test automation and comprises the following components: the task management unit is used for managing the wind tunnel test combined flat plate calibration task; the generating unit generates parameter information of the wind tunnel test combined panel to be calibrated; a wiring unit for generating a wiring scheme; a drawing unit for drawing a measurement line and a measurement point; the measuring unit is used for reading the reading of each measuring point on the measuring line and obtaining the measuring data of all the measuring points; a calculation unit for calculating a distance value from each measurement point to an ideal plane based on the measurement data of each measurement point, and obtaining a maximum value and a minimum value of the distance from the measurement point to the ideal plane; and the system is used for calculating and obtaining the flatness error of the wind tunnel test combined flat plate to be calibrated based on the distance maximum value and the distance minimum value, and can realize the automatic calibration of the flat plate for the wind tunnel.
Description
Technical Field
The invention relates to the field of wind tunnel tests, in particular to a flat plate automatic calibration system for a wind tunnel.
Background
The wind tunnel test flat plate is a plane reference for verification and adjustment of various aircraft and weapon model test models before wind tunnel test. The plate specifications include single plates and combined plates.
The wind tunnel test combined flat plate is formed by splicing a plurality of single flat plates with different specifications, and forms a cross shape, a T shape, a triangular shape, a rectangular shape and the like, and wind tunnel technicians plan different measuring routes according to different shapes of the flat plates to detect the flatness.
The existing flat plate calibration mode for wind tunnels needs to manually prepare calibration tasks and calibration equipment before each calibration and detection, and needs to be prepared once for each detection, so that good detection cannot be performed when the detection task pressure is high.
Disclosure of Invention
The invention aims to realize automatic calibration of a flat plate for a wind tunnel.
To achieve the above object, the present invention provides an automated calibration system for a flat panel for a wind tunnel, the system comprising:
the task management unit is used for managing the wind tunnel test combined flat plate calibration task;
the generating unit is used for generating parameter information of the wind tunnel test combined flat plate to be calibrated based on the wind tunnel test combined flat plate calibration task;
the wiring unit is used for generating a wiring scheme based on parameter information of the wind tunnel test combined panel to be calibrated;
the drawing unit is used for drawing a measuring line and corresponding measuring points on the measuring line on the wind tunnel test combined flat plate to be calibrated based on a wiring scheme;
the measuring unit is used for fixing the electronic level instrument on the bridge plate aiming at each measuring line, sequentially moving the bridge plate from one end of the measuring line to the other end of the measuring line along a straight line according to the selected span, and reading the reading of each measuring point on the measuring line on the electronic level instrument to obtain the measuring data of all the measuring points;
a calculation unit for calculating a distance value from each measurement point to an ideal plane based on the measurement data of each measurement point, and obtaining a maximum value and a minimum value of the distance from the measurement point to the ideal plane; and the flatness error of the wind tunnel test combined flat plate to be calibrated is obtained through calculation based on the distance maximum value and the distance minimum value.
The principle of the system is that a task management unit can be used for making a wind tunnel test combined flat plate calibration task, a detector can complete detection only by inputting task information each time, and the system does not need to repeatedly execute relevant accurate work each time, so that the detection efficiency is improved; the wiring unit can be used for generating a wiring scheme based on parameter information of the wind tunnel test combined panel to be calibrated; the drawing unit can draw a measuring line and corresponding measuring points on the measuring line on the wind tunnel test combined flat plate to be calibrated based on a wiring scheme; the electronic level meter can be fixed on the bridge plate by utilizing the measuring unit aiming at each measuring line, the bridge plate is sequentially moved from one end to the other end of the measuring line along a straight line according to the selected span, and the reading of each measuring point on the measuring line is read on the electronic level meter to obtain the measuring data of all the measuring points; the calculating unit is used for calculating the distance value from each measuring point to the ideal plane based on the measured data of each measuring point to obtain the maximum value and the minimum value of the distance from the measuring point to the ideal plane; and the flatness error of the wind tunnel test combined flat plate to be calibrated can be obtained based on the distance maximum value and the distance minimum value, namely the system can automatically perform wiring, slide county and measurement and calculation, and realizes automatic calibration of the flat plate for the wind tunnel.
Preferably, the system further comprises a display unit for displaying the wiring scheme and the calculation result of the calculation unit. The display unit is used for facilitating observation and display of the first detection result and the first detection process of the staff.
Preferably, the system further comprises a certificate management unit, which is used for adding certificate information into the identity information of the wind tunnel test combination flat plate with qualified flatness error. And the certificate management unit can issue a qualified certificate for the qualified flat plate, and then when the wind tunnel test is carried out subsequently, a tester can select the qualified test flat plate for use only according to the certificate.
Preferably, the system further comprises a storage unit, wherein the storage unit is used for storing the wind tunnel test combined flat plate calibration task information, wiring scheme information, measurement data and flatness error results of the wind tunnel test combined flat plate to be calibrated. The storage unit is utilized to realize information electronization, so that information can be stored and managed conveniently.
Preferably, the task management unit specifically includes:
the input module is used for inputting the size information, the shape information and the application information of the wind tunnel test combined panel which is required to be calibrated by the calibration tester;
the auditing module is used for auditing the data input by the input module;
the selection module is used for selecting corresponding calibration equipment information, calibration personnel information and calibration date information based on the wind tunnel test combined panel to be calibrated after the verification is qualified;
the task management module is used for generating a wind tunnel test combination flat plate calibration task of the wind tunnel test combination flat plate to be calibrated based on the information related to the wind tunnel test combination flat plate to be calibrated in the input module and the selection module.
The task management unit is used for formulating corresponding tasks according to various requirements, so that the tasks are convenient to manage, and the system is convenient to detect correspondingly according to the tasks.
Preferably, the system further comprises a circuit diagram unit for generating a measurement circuit diagram based on the drawing result of the drawing unit, and updating the measurement circuit diagram in real time in the measurement process. The whole condition and progress of detection can be observed by the staff conveniently by utilizing the circuit diagram unit.
The conventional verification method of the wind tunnel test combined flat plate is an electronic level method, and the electronic level method is suitable for verifying single plates or combined flat plates (> 400mm multiplied by 400 mm), and because the combined flat plates are complex in shape and large in area, points are marked by adopting a Chinese character 'mi' method, so that the number of the measured points is large, and the bridge plate spans on each line segment are different. When each line segment is measured, the bridge span must be checked and confirmed or readjusted, and the position and measuring direction of the level relative to the bridge must be kept unchanged. The verification personnel can only squat on the flat plate for a long time to read, and the bridge plate is carefully moved to the next line segment and the end-to-end connection is ensured after one data is read. In this way hundreds of data are measured and recalculated, the whole process takes at least one day. If the single flat plate is unqualified, the single flat plate needs to be repeatedly adjusted, so that the labor intensity is high, the efficiency is low, errors are easy to occur, the data analysis amount is huge, errors are easy to occur, the non-main section part of the flat plate with a special shape (cross shape, T shape and triangular shape) cannot be completely covered, the dot layout on the single flat plate is uneven, and the flat plate flatness information cannot be objectively reflected.
It is also an object of the present invention to achieve a fast and accurate flatness measurement of wind tunnel test composite plates.
In order to achieve the above object, preferably, the computing unit is specifically configured to:
calculating the straightness deviation value of the measuring point to the corresponding measuring line based on the measuring data of the measuring point;
and calculating the distance value from the measuring point to the ideal plane based on the straightness deviation value of the measuring point to the corresponding measuring line and the distance from the known two points on the measuring line to the ideal plane.
Preferably, the calculation unit calculates the straightness deviation value of the measuring point to the corresponding measuring line by using the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,
for the straightness deviation value of the i-th measuring point to the corresponding measuring line, i is the measuring point number, i=0, 1,2,..，/>
Reading values for the j-th measurement section, +.>
The line value difference of two points to be measured is corresponding to each cell of the electronic level meter, and n is the number of segments.
Preferably, the calculation unit calculates the distance value from the measurement point to the ideal plane using the following formula:
wherein d o To measure the distance from the starting point to the ideal plane on the line, d i To measure the distance from the ith measurement point on the line to the ideal plane, d m To measure the distance from the mth point on the line to the ideal plane, d n To measure the distance of the nth point on the line to the ideal plane, i is the measurement point number, i=0, 1,2,..,
for the straightness deviation value of the mth measuring point to the corresponding measuring line,
for the straightness deviation value of the ith measuring point to the corresponding measuring line, the value is +.>
The straightness deviation value of the n-th measuring point to the corresponding measuring line is obtained.
Preferably, the wind tunnel test combined flat plate comprises a main body part and other parts, wherein the main body part is wired in a Chinese character 'mi' type mode, and the other parts are wired in a grid mode.
The flatness error measurement of the wind tunnel test combined flat plate adopts a mode of using a meter word line and grid wiring, a pitch method is used for processing data, a measured section is divided into a plurality of sections, an electronic level meter is used for measuring the inclination angle change of the measured section relative to a measurement reference (natural level), the deviation of each measurement point of the measured section to the connection line of two end points is calculated, the deviation of each section measurement point of a working surface to an evaluation reference is calculated according to a flatness evaluation method, the data processing is carried out according to the reading of the electronic level meter at each measurement point position of each section and a flatness evaluation method, and the flatness of the flat plate working surface is calculated, so that the rapid and accurate flatness measurement of the wind tunnel test combined flat plate is realized.
The method for measuring the flatness of the panel based on the main section flatness is guaranteed by adopting a diagonal gridding wiring measurement method and processing and analyzing the measured value through differential equation technology, and the high efficiency and the accuracy of the method for measuring the flatness of the panel based on the non-main part are considered, so that the method can realize rapid and accurate flatness measurement of the wind tunnel test combined panel.
The one or more technical schemes provided by the invention have at least the following technical effects or advantages:
the invention realizes the automatic calibration of the flat plate for the wind tunnel.
The invention realizes the rapid and accurate flatness measurement of the wind tunnel test combined flat plate.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a schematic diagram of the components of an automated calibration system for a wind tunnel panel;
FIG. 2 is a flow chart of a differential equation based method for measuring flatness errors of a combined flat plate for a wind tunnel;
FIG. 3 is a rectangular combination flat layout schematic;
FIG. 4 is a schematic diagram of a cross-shaped composite panel layout;
FIG. 5 is a schematic diagram of a principle of flatness measurement of a cross-shaped combined flat plate;
fig. 6 is a schematic view of the distance between each point on a straight line and an ideal plane.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. In addition, the embodiments of the present invention and the features in the embodiments may be combined with each other without collision.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than within the scope of the description, and the scope of the invention is therefore not limited to the specific embodiments disclosed below.
Example 1
Referring to fig. 1, fig. 1 is a schematic diagram of a system for automatically calibrating a flat panel for a wind tunnel, and in accordance with an embodiment of the present invention, a system for automatically calibrating a flat panel for a wind tunnel is provided, the system includes:
the task management unit is used for managing the wind tunnel test combined flat plate calibration task;
the generating unit is used for generating parameter information of the wind tunnel test combined flat plate to be calibrated based on the wind tunnel test combined flat plate calibration task;
the wiring unit is used for generating a wiring scheme based on parameter information of the wind tunnel test combined panel to be calibrated;
the drawing unit is used for drawing a measuring line and corresponding measuring points on the measuring line on the wind tunnel test combined flat plate to be calibrated based on a wiring scheme;
the measuring unit is used for fixing the electronic level instrument on the bridge plate aiming at each measuring line, sequentially moving the bridge plate from one end of the measuring line to the other end of the measuring line along a straight line according to the selected span, and reading the reading of each measuring point on the measuring line on the electronic level instrument to obtain the measuring data of all the measuring points;
a calculation unit for calculating a distance value from each measurement point to an ideal plane based on the measurement data of each measurement point, and obtaining a maximum value and a minimum value of the distance from the measurement point to the ideal plane; and the flatness error of the wind tunnel test combined flat plate to be calibrated is obtained through calculation based on the distance maximum value and the distance minimum value.
The current flat plate calibration flow used by the detection department does not realize automatic butt joint and acquisition of detection equipment. Meanwhile, only the detection and calculation process is focused, and the flow control is not realized. Therefore, the invention establishes the flat-plate automatic calibration system for the wind tunnel to complete the automatic processing of flat-plate calibration service. The system can realize data acquisition and input of rectangular, cross-shaped and T-shaped large-sized plates in the plate calibration process, automatically acquire numbers (two detection devices of a TESA MICROBEVEL1 electronic level instrument and a Talay Bluetooth electronic level instrument) and directly obtain flatness errors after data processing, and realize the functions of data storage, data analysis, fitting of three-dimensional figures on the surfaces of the plates, automatic generation of certificates and printing. And a flat calibration data management software module is established, and the flat calibration data management software module has the functions of storage and retrieval.
In the embodiment of the invention, the system further comprises a display unit, wherein the display unit is used for displaying the wiring scheme and the calculation result of the calculation unit.
In the embodiment of the invention, the system further comprises a certificate management unit for adding certificate information into the identity information of the wind tunnel test combined flat plate with qualified flatness error.
In the embodiment of the invention, the system further comprises a storage unit, wherein the storage unit is used for storing the wind tunnel test combined flat plate calibration task information, the wiring scheme information, the measurement data and the flatness error result of the wind tunnel test combined flat plate to be calibrated.
In this embodiment of the present invention, the task management unit specifically includes:
the input module is used for inputting the size information, the shape information and the application information of the wind tunnel test combined panel which is required to be calibrated by the calibration tester;
the auditing module is used for auditing the data input by the input module;
the selection module is used for selecting corresponding calibration equipment information, calibration personnel information and calibration date information based on the wind tunnel test combined panel to be calibrated after the verification is qualified;
the task management module is used for generating a wind tunnel test combination flat plate calibration task of the wind tunnel test combination flat plate to be calibrated based on the information related to the wind tunnel test combination flat plate to be calibrated in the input module and the selection module.
In the embodiment of the invention, the system further comprises a circuit diagram unit, which is used for generating a measurement circuit diagram based on the drawing result of the drawing unit and updating the measurement circuit diagram in real time in the measurement process.
The specific detection process of the system comprises the following steps:
detection plan: and (3) detecting the input of the receiving task, and arranging a detection plan to form a task to be detected.
The detection process comprises the following steps: and detecting tasks to be detected in the detection plan, and completing detection business processes (simulation display of the pieces to be detected, roadmap generation, detection data entry and detection result calculation). And recording the related process files in the detection process. After the acquisition is completed, the original data detected each time can be checked and corrected, and a modification log is recorded when needed.
The evidence issuing process comprises the following steps: after the laboratory finishes detection, certificate issuing management is carried out on the calibrated piece, a corresponding calibration certificate is generated, a word document is generated according to the certificate format requirement, and the word document is exported.
The system realizes the functions of storing and retrieving the flat calibration data through the management module of the digital system, realizes the informatization and automatic control of the whole process of flat metering, performs full-period and omnibearing precise management and control, meets the requirement of precise tracing, and improves the efficiency of guarantee work.
Example two
On the basis of the first embodiment, the second embodiment of the present invention provides a method for measuring a flatness error of a combined flat plate for a wind tunnel based on a differential equation, please refer to fig. 2, fig. 2 is a schematic flow chart of the method for measuring a flatness error of a combined flat plate for a wind tunnel based on a differential equation, and the method for measuring a flatness error of a combined flat plate for a wind tunnel based on a differential equation is provided, which includes:
setting a wiring mode based on the shape and the size of the wind tunnel test combined flat plate to obtain a wiring scheme;
drawing a measuring line and corresponding measuring points on the measuring line on the wind tunnel test combined flat plate based on a wiring scheme;
for each measuring line, fixing an electronic level on the bridge plate, sequentially moving the bridge plate from one end of the measuring line to the other end along a straight line according to the selected span, and reading the reading of each measuring point on the measuring line on the electronic level to obtain the measuring data of all the measuring points;
calculating the distance value from each measuring point to the ideal plane based on the measuring data of each measuring point, and obtaining the maximum value and the minimum value of the distance from the measuring point to the ideal plane;
and calculating and obtaining the flatness error of the wind tunnel test combined flat plate based on the distance maximum value and the distance minimum value.
The following first describes the wiring mode during measurement of the method:
according to the main section of the flat plate and the meter word line mode, other parts are arranged according to grid lines. The wiring modes of the rectangular combined flat plate and the cross-shaped combined flat plate are shown in fig. 3 and 4, fig. 3 is a wiring schematic diagram of the rectangular combined flat plate, fig. 4 is a wiring schematic diagram of the cross-shaped combined flat plate, and numbers 1-28 in fig. 4 respectively represent points of the wiring scheme falling on the combined test flat plate and are also starting points or end points of measuring lines on the flat plate by the wiring method.
The wiring schematic diagram of the cross-shaped combined flat plate is shown in fig. 4. In addition to diagonal lines, side lines and central lines, grid lines are added, the distances between parallel lines are equal, and the intersection point of the transverse lines and the vertical lines is a measuring point. The main section refers to the main part of the plate, i.e. the effective maximum rectangular area. Grid lines refer to: and establishing the intersection of the horizontal and vertical axes and the maximum rectangular boundary by using the intersection point of the diagonal lines. Taking the intersection point as a first point, taking points with equal intercept along the rectangular side line to two sides, and forming grid lines by taking the taken points as the horizontal and vertical coordinates respectively.
a. And selecting a main section and wiring. When wiring, the rectangular flat plate is in a meter word line mode; the main part of the special shape flat plate is in a meter word line mode, but irregular part measurement dead zones (small rectangles on two sides cannot be measured) exist, and other parts are arranged in grid lines for measuring more accurately. The number of wiring points is set according to the size of the combined flat plate, generally more than or equal to 49 points, and the number of single flat plate size (630 mm multiplied by 400 mm) to (1600 mm multiplied by 1000 mm) measurement points is not less than 25, and the number of single flat plate size is not less than 49 (1600 mm multiplied by 1000 mm) measurement points. And selecting the set number of grid lines according to the requirement of the measurement points. Principle to be followed for wiring: firstly, the central axes in the vertical and horizontal directions must pass through the intersection point of diagonal lines, and an acquisition point is arranged at the intersection point; secondly, taking points on diagonal lines, vertical lines and horizontal lines, and equally dividing the lines; thirdly, the distances between points on the diagonal, vertical and horizontal lines can be designed independently, but on the same type of line, the point-to-point distances must be consistent. For example, the dot pitch on the transverse line must all take the same value, i.e. the transverse bridge pitch. Limited by the bridge plate length, the typical point-to-point distance is 200 mm-520 mm. Such wiring is optimized, wiring is minimized, and coverage is maximized.
b. To ensure accurate measurement, the wire is required to avoid the influence of edges and welding seams as much as possible, and the distance between the wire and the edge of the working surface of the flat plate is generally not less than 15 mm.
c. And drawing lines and points on the flat plate according to the wiring schemes of the two wires.
d. The measurement data must first start from the diagonal. The electronic level is fixed to the bridge deck with a plasticine or adhesive tape, and the bridge deck is sequentially moved in a straight line from one end of the diagonal (or horizontal, vertical) of the slab to the other according to the selected span (i.e., point-to-point distance described above), and readings are taken at each location on the electronic level. The measurement direction of the electronic level should be considered during measurement, and the electronic level should be kept moving along the wiring direction. Each time the bridge plate is moved, the bridge plate must be connected end to end, i.e. the last head supporting point position of the bridge plate, after the bridge plate is moved, the tail supporting point of the bridge plate is positioned at the position. In the bridge plate moving process, the electronic level instrument and the bridge plate cannot be relatively displaced, so that the bridge plate and the electronic level instrument are ensured to be used as an integral angle measurement, and the reading of the electronic level instrument is more accurate.
The measurement of all the measurement points is completed, each measurement point obtains the corresponding measurement data, and then the following flatness calculation is performed:
the straightness error assessment is carried out by adopting a two-end method in the processing of straightness measurement data, and the calculation formula of the deviation value of each measurement point to the connecting line of the two ends is as follows:
wherein:
for the straightness deviation value of the i-th measuring point to the corresponding measuring line, i is the measuring point number, i=0, 1,2,..n,/, -j>
Reading values for the j-th measurement section, +.>
The line value difference of two points to be measured is corresponding to each cell of the electronic level meter, and n is the number of segments.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
the definition data is related to the precision of the electronic level device, where n is the definition data and is the number of segments on each measurement line.
a. Flatness error calculation method
The deviation value of the connecting line from each measuring point to two end points on the straight line can be calculated by the formula (1)
. Assuming that the ideal plane passes through two points ad and is parallel to the line bc, the distance from points a and d to the ideal plane is 0 +.>
Then the straightness deviation of the midpoint O of the line segment adLI.e. its distance from the ideal plane. b. c the two points have the same distance to the ideal plane, and are arranged at the O pointStraightness deviation value on straight line bcHThe distance between the points b and c and the ideal plane is%L-H). Based on the pitch method flatness assessment method, see formula (2), the distance from each point on the abcd plane to the ideal plane can be calculated.
By two points r on the plane abcd at a known relative ideal plane distance 1 、r 2 Sum s 1 、s 2 Respectively connecting the lines to the irregular parts of the flat plate to obtain a straight line p 1 p 2 And q 1 q 2 Calculating the straight line p according to the formula (5) and the formula (6) 1 p 2 And q 1 q 2 The straightness deviation of each point on the upper part. Known r 1 、r 2 、s 1 、s 2 The distance from four points to the ideal plane is p 1 p 2 Straight line is taken as an example, let r 1 Is a straight line p 1 p 2 The mth point, r 2 Is a straight line p 1 p 2 The nth point on the upper part is set from the mth point to p 1 p 2 The deviation values of the two end point connecting lines are respectively
、/>
Further, let the mth point n point (m<n) the distance from the ideal plate is d m 、d n The distance between each point on the straight line and the ideal plane is d i The schematic diagrams are shown in fig. 5-6, and the abscissa in fig. 6 is the distance from the point on the measurement line to the starting point of the line, in units of: mm; the ordinate is the distance of a point on a measurement line from the line on which the line is projected onto the ideal plane (in fact, a difference, i.e. the deviation of the straightness of the measurement point from its corresponding measurement line), in: />
。
The formulas of formulas (3) and (4) to avoid the situation that n equals m when the algorithm is implemented, will cause algorithm error, so the formulas are corrected as:
wherein d o To measure the distance from the starting point to the ideal plane on the line, d i To measure the distance from the ith measurement point on the line to the ideal plane, d m To measure the distance from the mth point on the line to the ideal plane, d n To measure the distance of the nth point on the line to the ideal plane, i is the measurement point number, i=0, 1,2,..,
for the straightness deviation value of the mth measuring point to the corresponding measuring line,
for the straightness deviation value of the ith measuring point to the corresponding measuring line, the value is +.>
The straightness deviation value of the n-th measuring point to the corresponding measuring line is obtained.
The straight line p can be calculated by the formula (5) 1 p 2 And q 1 q 2 The distance between each point on the plane and the ideal plane can be calculated according to the formula (6) 1 q 1 r 1 s 1 And p 2 q 2 r 2 s 2 The distance between each measuring point on the plane and the ideal plane is calculated by the distance from all measuring points on the whole plane to the ideal planeThe absolute value of the difference between the maximum value and the minimum value of the distance of the wanted plane is taken as the flatness error of the whole combined flat plate.
b. The calculation process comprises the following steps:
1. the distances between each point on the main diagonal and the auxiliary diagonal relative to an ideal plane are calculated.
2. If both end points of the selected line are calculated after traversing all the remaining lines, the distances of other points on the lines with respect to the ideal plane are calculated according to equation (5), and the loop is continued until the lines of all the two end points are calculated.
3. All lines are traversed again, checking for the presence of an uncomputed line and the presence of two points on the line that have been computed, which are not end points. If so, finding out the two points m, n which are the largest possible distances, and calculating the distance according to the formulas (5) and (6).
And finally taking the absolute value of the difference between the maximum value and the minimum value of the distances from all the measuring points on the whole flat plate to the ideal plane as the flatness error of the whole combined flat plate.
The method in the embodiment can rapidly and efficiently finish the flatness measurement of the wind tunnel combined test panel.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. A flat panel automated calibration system for a wind tunnel, the system comprising:
the task management unit is used for managing the wind tunnel test combined flat plate calibration task;
the generating unit is used for generating parameter information of the wind tunnel test combined flat plate to be calibrated based on the wind tunnel test combined flat plate calibration task;
the wiring unit is used for generating a wiring scheme based on parameter information of the wind tunnel test combined panel to be calibrated;
the drawing unit is used for drawing a measuring line and corresponding measuring points on the measuring line on the wind tunnel test combined flat plate to be calibrated based on a wiring scheme;
the measuring unit is used for fixing the electronic level instrument on the bridge plate aiming at each measuring line, sequentially moving the bridge plate from one end of the measuring line to the other end of the measuring line along a straight line according to the selected span, and reading the reading of each measuring point on the measuring line on the electronic level instrument to obtain the measuring data of all the measuring points;
a calculation unit for calculating a distance value from each measurement point to an ideal plane based on the measurement data of each measurement point, and obtaining a maximum value and a minimum value of the distance from the measurement point to the ideal plane; the flatness error of the wind tunnel test combined flat plate to be calibrated is obtained through calculation based on the distance maximum value and the distance minimum value;
the computing unit is specifically configured to:
calculating the straightness deviation value of the measuring point to the corresponding measuring line based on the measuring data of the measuring point;
calculating the distance value from the measuring point to the ideal plane based on the straightness deviation value of the measuring point to the corresponding measuring line and the distance from the known two points on the measuring line to the ideal plane;
the calculation unit calculates the straightness deviation value of the measuring point to the corresponding measuring line by adopting the following formula:
the calculation unit calculates the distance value from the measuring point to the ideal plane by adopting the following formula:
the wind tunnel test combined flat plate comprises a main body part and other parts, wherein the main body part is wired in a Chinese character 'mi' type mode, and the other parts are wired in a grid mode.
2. The automatic calibration system for a flat panel of a wind tunnel according to claim 1, further comprising a display unit for displaying the wiring scheme and the calculation result of the calculation unit.
3. The automatic calibration system for the wind tunnel flat panel according to claim 1, wherein the system further comprises a certificate management unit for adding certificate information to the identity information of the wind tunnel test combination flat panel with qualified flatness error.
4. The automatic calibration system for the wind tunnel flat plate according to claim 1, wherein the system further comprises a storage unit for storing the calibration task information of the wind tunnel test combined flat plate, the wiring scheme information, the measurement data and the flatness error result of the wind tunnel test combined flat plate to be calibrated.
5. The automated calibration system for a wind tunnel panel according to claim 1, wherein the task management unit specifically comprises:
the input module is used for inputting the size information, the shape information and the application information of the wind tunnel test combined panel which is required to be calibrated by the calibration tester;
the auditing module is used for auditing the data input by the input module;
the selection module is used for selecting corresponding calibration equipment information, calibration personnel information and calibration date information based on the wind tunnel test combined panel to be calibrated after the verification is qualified;
the task management module is used for generating a wind tunnel test combination flat plate calibration task of the wind tunnel test combination flat plate to be calibrated based on the information related to the wind tunnel test combination flat plate to be calibrated in the input module and the selection module.
6. The automatic calibration system for a flat panel of a wind tunnel according to claim 1, wherein the system further comprises a line graph unit for generating a measurement line graph based on the drawing result of the drawing unit and updating the measurement line graph in real time during the measurement.
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