Laser measurement system building method for ultra-large aviation process equipment

Abstract

The invention discloses a laser measurement system building method for ultra-large aviation process equipment, which comprises the following steps of: designing a measurement field, setting a system building point position of the measurement field, and determining a measurement station of a laser tracker; measuring and recording temperature data of each building point in the measurement field; measuring the space coordinates of all the system building points in the measuring field; performing iteration judgment of out-of-tolerance data on the space coordinates of the building points at the measurement stations of the laser tracker so as to eliminate the building points with out-of-tolerance space coordinates; performing spatial networking on all the system building points in the measurement field, and determining the relative spatial relationship of all the system building points; and establishing a coordinate system based on the relative spatial relationship of all the system establishment points in the measurement field. According to the technical scheme provided by the invention, the problem that in a reference point measurement mode of ultra-large aviation process equipment, due to measurement errors and temperature factors of measurement equipment, the precision of a measurement field formed by station transfer matching of measured data and theoretical data of the reference point is reduced, and the assembly measurement requirement cannot be met is solved.

Description

Technical Field

[0001] The present invention relates to the field of aviation tooling design technology, but is not limited to it, and in particular to a laser measurement system building method for super-large aviation process equipment. Background Art

[0002] As the performance requirements of the new generation of aircraft increase, the quality requirements for aircraft assembly are becoming higher and higher. In the digital assembly measurement of aircraft, the transfer accuracy of the laser tracker determines the measurement accuracy and assembly quality, and improving the transfer accuracy is crucial.

[0003] Due to the complex environment of the assembly site and the large size and structure of the tooling, the length is up to 40m. The tooling structure will undergo different degrees of thermal deformation with temperature changes, which will cause the reference points arranged on the tooling to deviate from the theoretical position. The measurement error and temperature factors of the measuring equipment in the actual measurement process will cause the measurement field formed by the transfer station matching of the actual measured data of the reference point and the theoretical data to be reduced in accuracy and cannot meet the assembly measurement requirements.

[0004] Therefore, it is necessary to conduct a detailed analysis of the various factors that affect the accuracy of the measurement field. How to analyze the causes of reduced measurement field accuracy based on measured data and simulation of tooling of different sizes and types, so as to provide a reference for the target accuracy prediction in the aircraft assembly tooling design stage and the target accuracy causes in the tooling measurement field deviation stage; in addition, how to separate the causes of measurement field errors caused by tooling measured data and compensate for the errors caused by temperature, and construct a measurement field that meets the requirements, has become the key to the current high-precision tooling design and measurement field construction. Summary of the invention

[0005] Purpose of the present invention: In order to solve the above-mentioned technical problems, an embodiment of the present invention provides a laser measurement system establishment method for ultra-large aviation process equipment, so as to solve the problem that in the measurement method of the reference points of ultra-large aviation process equipment, the measurement error of the measuring equipment and temperature factors will cause the measurement field formed by the transfer and matching of the actual measured data of the reference points with the theoretical data to be reduced in accuracy, and the assembly measurement requirements cannot be met.

[0006] The technical solution of the present invention: The embodiment of the present invention provides a laser measurement system establishment method for super-large aviation process equipment, characterized in that it includes:

[0007] Step 1: Design of measurement field, including: setting the location of the measurement field establishment point and determining the measurement station of the laser tracker;

[0008] Step 2, measuring and recording the temperature data of each system establishment point in the measurement field;

[0009] Step 3: measure the spatial coordinates of all the system building points in the measurement field;

[0010] Step 4: At each measuring station of the laser tracker, iteratively judge the out-of-tolerance data of the spatial coordinates of each system establishment point to eliminate the system establishment points with out-of-tolerance spatial coordinates;

[0011] Step 5: spatially network all the establishment points in the measurement field and determine the relative spatial relationship of all the establishment points;

[0012] Step six: Establish a coordinate system based on the relative spatial relationship of all the system construction points in the measurement field.

[0013] Optionally, in the laser measurement system establishment method for super-large aviation process equipment as described above, the measurement field design in step 1 is specifically performed as follows:

[0014] Step 1-1, setting the position of the tie points in the measurement field, including: according to the length and width of the measurement field where the measurement object is located, evenly setting the tie points around the measurement field, and the spacing between the tie points does not exceed 15% of the length and width of the measurement field; the positions of the arranged tie points are kept continuous, in the same straight line in the horizontal direction, and at the same height in the vertical direction;

[0015] Step 1-2, determining the measurement station of the laser tracker, including: preliminarily setting the measurement station of the laser tracker according to the location of the establishment point, and taking the measurement station of a single laser tracker covering the most establishment points as the principle of selecting the measurement station; overcoming the environmental occlusion phenomenon in the measurement field by setting multiple measurement stations; finally, adjusting each measurement station according to factors such as the foundation stability of the measurement field, the angle at which the target ball receives the laser, and the measurement distance, and determining the measurement station and the number of stations of the laser tracker;

[0016] Step 1-3, determine the measurement accuracy threshold, measurement environment temperature change threshold, measurement mode, and sampling frequency according to the size and environment of the measurement field where the measurement object is located; wherein the measurement parameters are adjusted as the attribute characteristics of the measurement object and the measurement environment change.

[0017] Optionally, in the laser measurement system establishment method for super-large aviation process equipment as described above, in step 1-2, when designing multiple measurement stations, the principle is to take the maximum number of common system establishment points between different measurement stations;

[0018] The common establishment point is the same establishment point that can be measured by the laser tracker at different measurement stations, so as to reduce the establishment error and improve the establishment accuracy.

[0019] Optionally, in the laser measurement system establishment method for super-large aviation process equipment as described above, the method for measuring and recording the temperature data of each system establishment point in the measurement field in step 2 is:

[0020] Use a temperature measuring gun to aim the temperature measuring laser at the center of the establishment point and keep it stable for 5 seconds. The average temperature measured within 5 seconds is taken as the temperature value of the establishment point at this moment. In the same way, maintain the same temperature measurement distance to measure the temperature of each establishment point in the measurement field and record the temperature data.

[0021] Optionally, in the laser measurement system building method for super-large aviation process equipment as described above, the step three of measuring the spatial coordinates of all system building points in the measurement field includes the following steps:

[0022] Step 3-1: The laser tracker is mechanically leveled at the current measurement position by adjusting the support feet or leveling screws of the base until the bubble in the laser tracker is completely located in the center of the circle; then, electronically level the laser tracker through the working panel, fine-tune the support feet or leveling screws of the base, and adjust the horizontal and vertical values ​​to 0; at this point, the laser tracker is in a balanced state and can be used for measurement;

[0023] Step 3-2: The laser tracker measures all observable system points three times at the current measurement station.

[0024] During the measurement process of step 3-2, continuously observe whether the laser tracker has slight deviations in the horizontal or vertical direction during the measurement process; if there are slight deviations, perform a drift check on the measured system points. If the Euclidean distance between the two measurement results does not exceed the measurement accuracy threshold, the laser tracker is deemed to have not deviated and continue measuring; if it exceeds the measurement accuracy threshold, the laser tracker is deemed to have deviated, and the laser tracker is leveled and the measurement is restarted; if the deviation occurs again later, it is deemed that the foundation at the current position is unstable, and the measurement station is changed and remeasured.

[0025] Optionally, in the laser measurement system establishment method for super-large aviation process equipment as described above, the iterative judgment of the out-of-tolerance data in step 4 includes the following steps:

[0026] Step 4-1, re-measure the temperature data of each establishment point in the measurement field, observe the temperature data of the establishment point measured this time and the temperature change in step 2, if the change value exceeds the ambient temperature change threshold, then remove the coordinate data of the establishment point and re-measure;

[0027] Step 4-2: For the system points whose temperature changes meet the requirements, a drift check is performed; if the coordinate change of the system point exceeds the measurement accuracy threshold, the coordinate data of the system point is discarded and re-measured;

[0028] Step 4-3, after completing the preliminary elimination of out-of-tolerance system points, take the average of the three measurement values, and make a difference between the three measurement values ​​and the average to obtain the deviation, eliminate the coordinate data of the system points whose deviation exceeds the measurement accuracy threshold, and re-measure the coordinate data of the corresponding system points, and repeat step 4-3 until the deviation value meets the measurement accuracy threshold requirement;

[0029] Step 4-4, performing surface fitting on the coordinate data of the system building points obtained from each measurement, and comparing the overlap between the surfaces.

[0030] Optionally, in the laser measurement system establishment method for super-large aviation process equipment as described above, the method of performing drift inspection on the system establishment points in step 4-2 includes:

[0031] Use a laser tracker to continuously measure the coordinate data of the system establishment points and observe the drift of the coordinate data values ​​of the measured system establishment points.

[0032] Optionally, in the laser measurement system establishment method for super-large aviation process equipment as described above, the step 5 of spatially networking all the system establishment points in the measurement field to determine the relative spatial relationship of all the system establishment points includes the following steps:

[0033] Step 5-1, the laser tracker is transferred to all measurement stations, and the local nominal values ​​of the coordinate data of each system establishment point at all measurement stations are obtained through steps 2 to 4;

[0034] Step 5-2, using the spatial networking method, select the local nominal values ​​of the coordinate data of the system building points corresponding to each measuring station of the laser tracking instrument to perform spatial networking operations to form a global nominal point set;

[0035] Step 5-3, remove the coordinate data of the system establishment points exceeding 3σ in the global nominal point set.

[0036] Optionally, in the laser measurement system establishment method for super-large aviation process equipment as described above, the way of establishing the coordinate system in step 6 is:

[0037] Use the global nominal point set obtained in step 5 as the reference point for system construction, and use the 3-2-1 system construction method, the selected coordinate axis system construction method, or the plane-normal system construction method to complete the laser measurement system construction of large-scale aviation process equipment.

[0038] Beneficial effects of the present invention: The embodiment of the present invention provides a laser measurement system construction method for super-large aviation process equipment. First, by selecting each system construction point and each measurement station, the measurement basis of the measurement field is established; secondly, the temperature of the system construction point during the measurement process is measured and recorded, and the spatial coordinates of each system construction point are iteratively judged for the deviation data, thereby ensuring the validity of the measurement data; thirdly, all the system construction points in the measurement field are spatially networked, the relative spatial relationship between the system construction points is converted into an absolute relationship in the coordinate system, and the laser tracker is used to perform micron-level position confirmation on the engineering site with high-precision measurement means; for the assembly deviation problem caused by the insufficient measurement accuracy of the laser tracker, it is an accurate and efficient measurement method. The method provided by the embodiment of the present invention is adopted to effectively solve the problem that in the measurement method of the reference point of super-large aviation process equipment, the measurement error of the measuring equipment and the temperature factor will cause the measurement field formed by the transfer station matching of the actual measured data of the reference point to be reduced in accuracy, and the assembly measurement requirements cannot be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0040] Figure 1 A flow chart of a method for establishing a laser measurement system for ultra-large aviation process equipment proposed in an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the arrangement of measurement points in step 1 of an embodiment of the present invention;

[0042] Figure 3 Schematic diagram of the drift check result of the system establishment point in step 3 of the embodiment of the present invention;

[0043] Figure 4 It is a schematic diagram of temperature changes before and after measurement in step 4 of an embodiment of the present invention;

[0044] Figure 5 It is a schematic diagram of the coordinate changes of the coordinate values ​​of the three system building points in step 4 of the embodiment of the present invention;

[0045] Figure 6 It is a schematic diagram of fitting the results of two measurements of the tie points in step 4 of an embodiment of the present invention into a curved surface.

[0046] Description of reference numerals:

[0047] 1. Measurement position 1 of the laser tracker; 2. Measurement position 2 of the laser tracker; 3. Establishment point 1; 4. Establishment point 11; 5. Establishment point 12; 6. Establishment point 22. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0049] As described in the above background technology, in the measurement method of the reference points of ultra-large aviation process equipment, the measurement errors and temperature factors of the measuring equipment in the actual measurement process will cause the measurement field formed by the transfer and matching of the actual measured data of the reference points with the theoretical data to be reduced in accuracy and unable to meet the assembly measurement requirements.

[0050] In view of the above problems, it is necessary to conduct a detailed analysis of various factors that affect the accuracy of the measurement field. To this end, an embodiment of the present invention provides a laser measurement system establishment method for ultra-large aviation process equipment.

[0051] The technical solution provided by the embodiment of the present invention mainly solves the following two problems:

[0052] On the one hand, how to analyze the causes of reduced measurement field accuracy based on measured data, different sizes and types of tooling, so as to provide a reference for the target accuracy prediction in the aircraft assembly tooling design stage and the target accuracy causes in the tooling measurement field out-of-tolerance stage;

[0053] On the other hand, how to separate the causes of measurement field errors caused by the actual measured data of the tooling and compensate for the errors caused by temperature, and construct a measurement field that meets the requirements, has become the key to current high-precision tooling design and measurement field construction.

[0054] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0055] like Figures 1 to 4 As shown, an embodiment of the present invention provides a laser measurement system establishment method for ultra-large aviation process equipment. The laser measurement system establishment method provided by the embodiment of the present invention includes the following steps:

[0056] Step 1: Design of measurement field, including: setting the location of the measurement field establishment point and determining the measurement station of the laser tracker;

[0057] Step 2, measuring and recording the temperature data of each system establishment point in the measurement field;

[0058] Step 3: measure the spatial coordinates of all the system building points in the measurement field;

[0059] Step 4: At each measuring station of the laser tracker, iteratively judge the out-of-tolerance data of the spatial coordinates of each system establishment point to eliminate the system establishment points with out-of-tolerance spatial coordinates;

[0060] Step 5: spatially network all the establishment points in the measurement field and determine the relative spatial relationship of all the establishment points;

[0061] Step six: Establish a coordinate system based on the relative spatial relationship of all the system construction points in the measurement field.

[0062] The laser measurement system establishment method for super-large aviation process equipment provided by the embodiment of the present invention is particularly suitable for the laser measurement system establishment of 40-meter-class large-scale aviation process equipment. The implementation method of the laser measurement system establishment method provided by the present invention is described in detail through a specific embodiment as follows:

[0063] Step 1, measurement field design, including: setting the location of the measurement field's establishment point and determining the measurement station of the laser tracker; in this step, the location of the measurement field's establishment point and the determination of the laser tracker's measurement coordinates are determined. The specific process is as follows:

[0064] Step 1-1, set the location of the anchor points in the measurement field. The length and width of the measurement field where the measurement object is located are: 40m×10m. Set anchor points around the stable foundation in the measurement field, 11 on each side in the north-south direction, for a total of 22 anchor points. The interval between adjacent anchor points is about 4m, and the points are arranged continuously, such as Figure 2 As shown, the mark 3 in the figure is the tie-up point 1, the mark 4 in the figure is the tie-up point 11, the mark 5 in the figure is the tie-up point 12, and the mark 6 in the figure is the tie-up point 22.

[0065] Step 1-2, determine the measurement station of the laser tracker. Based on the position of the system point in the measurement field set in step 1-1, comprehensively consider the foundation stability of the measurement field, the angle of the target sphere receiving the laser, the measurement distance, environmental occlusion and other factors, and finally determine the two measurement stations of the laser tracker as follows: Figure 2 1 and 2 in the figure. Measurement station 1 can observe the establishment points 1-4 and 12-22, and measurement station 2 can observe the establishment points 1-11 and 18-22. The common establishment points between the two measurement stations are establishment points 1-4 and 18-22. At this time, the spatial coordinates of the establishment points measured at the two measurement stations each represent a part of the measurement field characteristics. The spatial coordinates of all the establishment points of the two measurement stations can be combined to fully represent the measurement field characteristics.

[0066] Step 1-3, according to the size of the measurement field where the measurement object is located (40m×10m) and the measurement environment, determine the measurement accuracy threshold: 0.05mm, the measurement environment temperature change threshold: 2°C, the measurement mode: ADM, the sampling frequency: Leica AT960 sampling frequency is a fixed value of 10Hz.

[0067] Step 2: Measure and record the temperature data of each system establishment point in the measurement field; the implementation method of step 2 is:

[0068] Before measuring at measuring station 1, use a temperature gun to measure and record the temperatures of tie points 1-4 and 12-22 in the measurement field.

[0069] Step three, measuring the spatial coordinates of all the establishment points in the measurement field; the implementation method of measuring the spatial coordinates of all the establishment points in the measurement field in step three is:

[0070] Step 3-1: This measurement uses a Leica AT960 laser tracker. The laser tracker is mechanically leveled at the current measurement position, and the base support feet or leveling screws are adjusted until the bubble in the laser tracker is completely in the center of the circle. Then, electronic leveling is performed through the laser tracker work panel, and the base support feet or leveling screws are fine-tuned to adjust the value to: (0,0). At this time, the laser tracker is in a balanced state and can be used for measurement;

[0071] Step 3-2, the laser tracker measures the tie points 1-4 and 12-22 three times at the measuring station 1;

[0072] During the measurement process of step 3-2, the leveling value of the laser tracker working panel is continuously observed during the measurement process. It is found that the leveling value of the laser tracker is offset from (0,0) to (1,0). At this time, a drift check is performed on the measured system point. For example, the drift check result of system point 1 is as follows: Figure 3 As shown, the deviation does not exceed the measurement accuracy threshold of 0.05mm, and the laser tracker considers that there is no deviation and continues to measure.

[0073] Step 4: At each measuring station of the laser tracker, iteratively judge the out-of-tolerance data of the spatial coordinates of each system establishment point to eliminate the system establishment points with out-of-tolerance spatial coordinates; the implementation method of iteratively judging the out-of-tolerance data in step 4 is as follows:

[0074] Step 4-1, re-measure the temperature of the establishment points 1-4 and 12-22 in the measurement field, and observe the temperature data of the establishment points measured this time and the temperature changes in step 2, such as Figure 4 It is observed that the temperature change does not exceed the ambient temperature change threshold, and the measurement result is retained;

[0075] Step 4-2, perform drift check on the establishment points 1-4 and 12-22. If the coordinate changes of the establishment points 1-4 and 12-22 do not exceed the measurement accuracy threshold of 0.05mm, the measurement results are retained;

[0076] Step 4-3, take the average of the spatial coordinates of the three establishment points measured at the measuring station 1, and make a difference between the three measured values ​​and the average to obtain the deviation. It is found that the deviations of the establishment point 14 in the first measurement, the establishment point 12 in the second measurement, and the establishment point 22 in the third measurement exceed the measurement accuracy threshold of 0.05mm. The coordinate data of the above establishment points are discarded, and the coordinate data of the establishment points 14, 12, and 22 are measured again until the deviation value meets the measurement accuracy threshold of 0.05mm. Figure 5 As shown;

[0077] For the above-mentioned elimination process of out-of-tolerance data, for example: in the current measurement station, the measurable system points are a, b, c, and d. In the first measurement, the deviation of system points a and b exceeds the measurement accuracy threshold; in the second measurement, the deviation value of system points b and c exceeds the accuracy threshold; and in the third measurement, the deviation of system point d exceeds the accuracy threshold. Then, the coordinate data of system points a and b in the first measurement, system points b and c in the second measurement, and system point d in the third measurement are eliminated, and system point a is remeasured once and added to the coordinate data of the first measurement; system point b is remeasured twice and added to the coordinate data of the first and second measurements respectively; system point c is remeasured once and added to the coordinate data of the second measurement; system point d is remeasured once and added to the coordinate data of the third measurement. After eliminating and re-adding the coordinate data of the system points, the mean of the three measurement values ​​is recalculated, and the deviation is obtained by subtracting the three measurement values ​​from the mean. If the deviation does not exceed the measurement accuracy threshold, the measurement task of the current measurement station is completed, and the mean is finally used as the coordinate data.

[0078] The local nominal values ​​of the coordinate data of the system points a, b, c, and d at the current measurement station.

[0079] Step 4-4, perform surface fitting on the coordinate data of the construction points obtained from each measurement, and compare the coincidence between the surfaces. The results are as follows: Figure 6 shown.

[0080] Step 5: spatially network all the establishment points in the measurement field to determine the relative spatial relationship of all the establishment points; the implementation method of step 5 is as follows:

[0081] Step 5-1, the laser tracker is transferred to the measuring station 2, and the local nominal values ​​of the coordinate data of each establishment point at the measuring station 2 are obtained through steps 2 to 4; the local nominal values ​​of the coordinate data of the establishment points obtained by the laser tracker at the measuring station 1 are combined to finally obtain the local nominal values ​​of the coordinate data of each establishment point at all the measuring stations;

[0082] Step 5-2, using the spatial networking method, select the local nominal values ​​of the coordinate data of the corresponding system points of the laser tracking instrument at the measuring stations 1 and 2 to perform the spatial networking operation, and transform the relative position relationship between the system points at the two measuring stations into the same coordinate space based on the common system points 1-4, 18-22 between the two measuring stations to form a global nominal point set;

[0083] Step 5-3, remove the coordinate data of the system establishment points exceeding 3σ in the global nominal point set.

[0084] Step 6: Establish a coordinate system based on the relative spatial relationship of all the system establishment points in the measurement field. The method of establishing the coordinate system in step 6 is:

[0085] Using the global nominal point set obtained in step five as the reference point for system construction, and using the 3-2-1 system construction method, the laser measurement system for large-scale aviation process equipment is completed.

[0086] The laser measurement system establishment method for super-large aviation process equipment provided by the embodiment of the present invention firstly establishes the measurement basis of the measurement field by selecting each system establishment point and each measurement station; secondly, measures and records the temperature of the system establishment point during the measurement process and iterates the judgment of the out-of-tolerance data of the spatial coordinates of each system establishment point to ensure the validity of the measurement data; thirdly, spatially networks all the system establishment points in the measurement field, converts the relative spatial relationship between the system establishment points into an absolute relationship in the coordinate system, and uses a laser tracker to confirm the position of the engineering site at the micron level by high-precision measurement means; for the assembly out-of-tolerance problem caused by the insufficient measurement system establishment accuracy of the laser tracker, it is an accurate and efficient measurement method. The method provided by the embodiment of the present invention effectively solves the problem that in the measurement method of the reference point of super-large aviation process equipment, the measurement error of the measuring equipment and the temperature factor will cause the measurement field formed by the transfer station matching of the actual measured data of the reference point to be reduced in accuracy, and the assembly measurement requirements cannot be met.

[0087] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A laser measurement system establishment method for ultra-large aviation process equipment, characterized in that: include: Step 1: Design of measurement field, including: setting the location of the measurement field establishment point and determining the measurement station of the laser tracker; Step 2: Measure and record the temperature data of each system point in the measurement field; Step 3: measure the spatial coordinates of all the system building points in the measurement field; Step 4: At each measuring station of the laser tracker, iteratively judge the out-of-tolerance data of the spatial coordinates of each system establishment point to eliminate the system establishment points with out-of-tolerance spatial coordinates; Step 5: spatially network all the establishment points in the measurement field and determine the relative spatial relationship of all the establishment points; Step six: Establish a coordinate system based on the relative spatial relationship of all the system construction points in the measurement field.

2. The laser measurement system establishment method for super-large aviation process equipment according to claim 1 is characterized in that: The measurement field design in step 1 is specifically designed as follows: Step 1-1, setting the position of the tie points in the measurement field, including: according to the length and width of the measurement field where the measurement object is located, evenly setting the tie points around the measurement field, and the spacing between the tie points does not exceed 15% of the length and width of the measurement field; the positions of the arranged tie points are kept continuous, in the same straight line in the horizontal direction, and at the same height in the vertical direction; Step 1-2, determining the measurement station of the laser tracker, including: preliminarily setting the measurement station of the laser tracker according to the location of the establishment point, and taking the measurement station of a single laser tracker covering the most establishment points as the principle of selecting the measurement station; overcoming the environmental occlusion phenomenon in the measurement field by setting multiple measurement stations; finally, adjusting each measurement station according to factors such as the foundation stability of the measurement field, the angle at which the target ball receives the laser, and the measurement distance, and determining the measurement station and the number of stations of the laser tracker; Step 1-3, determine the measurement accuracy threshold, measurement environment temperature change threshold, measurement mode, and sampling frequency according to the size and environment of the measurement field where the measurement object is located; wherein the measurement parameters are adjusted as the attribute characteristics of the measurement object and the measurement environment change.

3. The laser measurement system establishment method for super-large aviation process equipment according to claim 2 is characterized in that: In the step 1-2, when designing multiple measuring stations, the principle is to take the maximum number of common connection points between different measuring stations; The common tethering point is the same tethering point that can be measured by the laser tracker at different measurement stations.

4. The laser measurement system establishment method for super-large aviation process equipment according to claim 1 is characterized in that: The method for measuring and recording the temperature data of each system establishment point in the measurement field in step 2 is: Use a temperature measuring gun to aim the temperature measuring laser at the center of the establishment point and keep it stable for 5 seconds. The average temperature measured within 5 seconds is taken as the temperature value of the establishment point at this moment. In the same way, maintain the same temperature measurement distance to measure the temperature of each establishment point in the measurement field and record the temperature data.

5. The laser measurement system establishment method for super-large aviation process equipment according to claim 1 is characterized in that: The step 3 measures the spatial coordinates of all the system building points in the measurement field, including the following steps: Step 3-1: The laser tracker is mechanically leveled at the current measurement position by adjusting the support feet or leveling screws of the base until the bubble in the laser tracker is completely located in the center of the circle; then, electronically level the laser tracker through the working panel, fine-tune the support feet or leveling screws of the base, and adjust the horizontal and vertical values ​​to 0; at this point, the laser tracker is in a balanced state and can be used for measurement; Step 3-2: The laser tracker measures all observable system points three times at the current measurement station. During the measurement process of step 3-2, continuously observe whether the laser tracker has slight deviations in the horizontal or vertical direction during the measurement process; if there are slight deviations, perform a drift check on the measured system points. If the Euclidean distance between the two measurement results does not exceed the measurement accuracy threshold, the laser tracker is deemed to have not deviated and continue measuring; if it exceeds the measurement accuracy threshold, the laser tracker is deemed to have deviated, and the laser tracker is leveled and the measurement is restarted; if the deviation occurs again later, it is deemed that the foundation at the current position is unstable, and the measurement station is changed and remeasured.

6. The laser measurement system establishment method for super-large aviation process equipment according to claim 1 is characterized in that: The iterative judgment of the out-of-tolerance data in step 4 includes the following steps: Step 4-1, re-measure the temperature data of each establishment point in the measurement field, observe the temperature data of the establishment point measured this time and the temperature change in step 2, if the change value exceeds the ambient temperature change threshold, then remove the coordinate data of the establishment point and re-measure; Step 4-2: For the system points whose temperature changes meet the requirements, a drift check is performed; if the coordinate change of the system point exceeds the measurement accuracy threshold, the coordinate data of the system point is discarded and re-measured; Step 4-3, after completing the preliminary elimination of out-of-tolerance system points, take the average of the three measurement values, and make a difference between the three measurement values ​​and the average to obtain the deviation, eliminate the coordinate data of the system points whose deviation exceeds the measurement accuracy threshold, and re-measure the coordinate data of the corresponding system points, and repeat step 4-3 until the deviation value meets the measurement accuracy threshold requirement; Step 4-4, performing surface fitting on the coordinate data of the system building points obtained from each measurement, and comparing the overlap between the surfaces.

7. The laser measurement system establishment method for super-large aviation process equipment according to claim 6, characterized in that: The method of performing drift check on the system establishment point in step 4-2 includes: Use a laser tracker to continuously measure the coordinate data of the system establishment points and observe the drift of the coordinate data values ​​of the measured system establishment points.

8. The laser measurement system establishment method for super-large aviation process equipment according to claim 1 is characterized in that: In the step 5, all the establishment points in the measurement field are spatially networked to determine the relative spatial relationship of all the establishment points, including the following steps: Step 5-1, the laser tracker is transferred to all measurement stations, and the local nominal values ​​of the coordinate data of each system establishment point at all measurement stations are obtained through steps 2 to 4; Step 5-2, using the spatial networking method, select the local nominal values ​​of the coordinate data of the system building points corresponding to each measuring station of the laser tracking instrument to perform spatial networking operations to form a global nominal point set; Step 5-3, remove the coordinate data of the system establishment points exceeding 3σ in the global nominal point set.

9. The laser measurement system establishment method for super-large aviation process equipment according to claim 1, characterized in that: The method of establishing the coordinate system in step 6 is: Use the global nominal point set obtained in step 5 as the reference point for system construction, and use the 3-2-1 system construction method, the selected coordinate axis system construction method, or the plane-normal system construction method to complete the laser measurement system construction of large-scale aviation process equipment.

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