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CN-122009514-A - Large-size measurement field component attitude thermal expansion compensation method

CN122009514ACN 122009514 ACN122009514 ACN 122009514ACN-122009514-A

Abstract

The application belongs to the technical field of thermal expansion compensation of large aircraft technical equipment, and particularly relates to a method for compensating the thermal expansion of a large-size measuring field part. According to the large-size measuring field component gesture thermal expansion compensation method, the expansion plate structure is utilized, the sensor ranging is combined, the assembly structure of the ranging sensor and the gesture adjusting positioner is unified, expansion amount change data of the expansion plate in two thermal expansion coefficient states and the gesture adjusting positioner are unified through a measuring field coordinate system, the expansion amount of the expansion plate with the same thermal expansion coefficient as that of a product to be assembled is used as the axial displacement momentum of the gesture adjusting positioner along the compensation direction, and the axial displacement momentum is transmitted to the block assembly component, so that thermal expansion compensation is realized. The application is suitable for high-precision assembly of various large-size aircraft products, and is suitable for unidirectional or multidirectional combination temperature compensation of a tool measuring field and a component gesture adjusting and positioning structure in the assembly process.

Inventors

  • ZHENG WEI
  • ZHOU XINFANG
  • XIA BIN
  • WANG SHOUCHUAN
  • WANG MIN

Assignees

  • 中航西安飞机工业集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (9)

  1. 1. A method of compensating for thermal expansion of a large-scale measurement field component pose, comprising: Step 1, acquiring a plurality of block assembly parts (7) of a to-be-assembled product, respectively installing process ball heads on each block assembly part (7), and connecting each process ball head with a corresponding posture adjusting positioner (6) through a hinge; Step 2, arranging expansion plates (1) of the same material in parallel in the compensation direction of the to-be-assembled connecting product, arranging a plurality of measurement datum points (8) on the upper surface of the expansion plates (1), and constructing a measurement field coordinate system based on the measurement datum points (8); step 3, selecting one block assembly part (7) as a compensation direction expansion reference, and setting the gesture adjusting positioner (6) connected with the compensation direction expansion reference as a long-direction compensation zero position (5); Step 4, arranging a fixed pin (2) at the position of the expansion plate (1) corresponding to the longitudinal compensation zero position (5), and connecting the expansion plate (1) with a tooling structure; step 5, setting a sliding rail parallel to the compensation direction on the interface of the expansion plate (1) and the tooling structure by taking the expansion reference in the compensation direction as a starting point; step 6, obtaining a vertical line perpendicular to the compensation direction for the hinging points of the process ball heads and the gesture adjusting positioner (6); Step 7, arranging limiting pieces (3) at the positions of the expansion plates (1) intersected with the perpendicular lines, wherein each limiting piece (3) is provided with a limiting piece measuring section parallel to the compensation direction, and a distance measuring sensor (4) is arranged at the position corresponding to each limiting piece measuring section; step 8, calibrating the distance relation between the hinge point of the process ball head and the gesture adjusting positioner (6) and the vertical line along the compensation direction under the measuring field coordinate system; Step 9, measuring the distance measurement information of the limiting piece (3) along the compensation direction caused by temperature change in real time through the distance measurement sensor (4); And 10, adjusting the axial displacement momentum of the gesture adjusting positioner (6) along the compensation direction according to the distance measurement information, and performing thermal expansion compensation.
  2. 2. The method for compensating for thermal expansion of large-scale measuring field component attitude according to claim 1, wherein in step 1, said attitude adjusting positioner (6) is provided on the upper surface of foundation (9).
  3. 3. The method for compensating for thermal expansion of attitude of large-size measurement field unit according to claim 2, wherein in step 7, said distance measuring sensor (4) is disposed on an upper surface of foundation (9).
  4. 4. The method for compensating for thermal expansion of large-scale measuring field component attitude according to claim 1, wherein in step 1, said attitude adjusting positioner (6) is provided on a column on the upper surface of foundation (9).
  5. 5. The method for compensating for thermal expansion of attitude of large-size measuring field unit according to claim 4, wherein in step 7, said distance measuring sensor (4) is provided on a column on the upper surface of foundation (9).
  6. 6. The method for compensating for thermal expansion of large-scale measuring field component according to claim 3 or 5, wherein in step 8, the distance relationship is expansion change data when the process ball joint and the vertical line are zero at a reference temperature along the compensation direction, wherein the expansion reference is the starting point.
  7. 7. The method of compensating for thermal expansion of large-scale measurement field member according to claim 6, wherein in step 10, the thermal expansion compensation is performed at fixed time intervals of not less than 30 minutes and not more than 2 hours.
  8. 8. The method of compensating for thermal expansion of a large-scale measurement field member according to claim 7, wherein in step 10, the axial displacement momentum is: ; ; Wherein p n is the axial displacement momentum of the nth compensation period, λ is a thermal response coefficient, d n is distance measurement information of the nth compensation period, p n-1 is the axial displacement of the nth-1 compensation period, ε is a temperature change rate compensation coefficient, T n is the temperature of the nth compensation period, T n-1 is the temperature of the nth-1 compensation period, Δt is a fixed time interval, and τ is a thermal time constant.
  9. 9. The method according to claim 8, wherein in step 10, when the distance measurement information is equal to or less than αmm, thermal expansion compensation is not performed, and α is a distance measurement information threshold.

Description

Large-size measurement field component attitude thermal expansion compensation method Technical Field The application belongs to the technical field of thermal expansion compensation of large aircraft technical equipment, and particularly relates to a method for compensating the thermal expansion of a large-size measuring field part. Background The aircraft manufactured products and the process equipment thereof have large sizes, the maximum aircraft process equipment size can reach about 80m, the aircraft manufactured products are mostly made of composite materials, aluminum alloy and other material structures, the process equipment is mostly made of steel structures, and the foundation of the rooting position of the process equipment is mostly made of reinforced concrete structures. Based on the above, due to factors such as uniformity, material difference and the like, the wing structure often adopts a long-direction expansion plate to compensate the wing box when the wing box is assembled. The fuselage structure usually does not use expansion plates because of good symmetry, but in large-scale precise fuselage assembly, the expansion plates are also a conventional structural design means. The current expansion panels are typically provided with a slat or beam structure throughout the expansion direction for supporting the positioning and measurement datum arrangement of the aircraft product, the slat or beam structure being of a material consistent with the panel skin material of the main expansion structure of the aircraft. The long slat or beam structure is generally provided with a fixed structure at the main positioning reference position of the airplane, parallel guide rails are arranged at other positions along the long direction, and the long slat or beam structure freely expands along the long direction along with the temperature change by taking the fixed structure as a reference. The expansion plate adopted in the existing aircraft manufacturing process at home and abroad is mainly suitable for the integral tool structure which is easy to change materials, and for discrete structure assembly tools such as horizontal wing box assembly, three-section butt joint of a fuselage and the like, the expansion plate is difficult to set or difficult to set completely in practice, and based on the expansion plate, a thermal expansion compensation method which can be suitable for the discrete structure assembly tools needs to be explored. Accordingly, there is a need for a solution that overcomes or mitigates at least one of the above-mentioned drawbacks of the prior art. Disclosure of Invention The application aims to provide a large-size measuring field component attitude thermal expansion compensation method, which aims to solve at least one problem existing in the prior art. The technical scheme of the application is as follows: A method of compensating for thermal expansion of a large-scale measurement field component pose, comprising: step 1, acquiring a plurality of block assembly parts of a to-be-assembled product, respectively mounting process ball heads on the block assembly parts, and connecting the process ball heads with corresponding gesture adjusting positioners through hinges; Step 2, arranging expansion plates of the same material in parallel in the compensation direction of the to-be-assembled connecting product, arranging a plurality of measurement datum points on the upper surface of the expansion plates, and constructing a measurement field coordinate system based on the measurement datum points; Step 3, selecting one block assembly part as a compensation direction expansion reference, and setting the gesture adjusting positioner connected with the compensation direction expansion reference as a long-direction compensation zero position; step 4, arranging a fixing pin at the position of the expansion plate corresponding to the longitudinal compensation zero position, and connecting the expansion plate with a tooling structure; step 5, setting a sliding rail parallel to the compensation direction on the interface of the expansion plate and the tooling structure by taking the expansion reference in the compensation direction as a starting point; step 6, obtaining a vertical line perpendicular to the compensation direction for the hinging points of the process ball heads and the gesture adjusting positioner; step 7, arranging limiting pieces on the positions of the expansion plates intersected with the vertical lines, wherein the limiting pieces are provided with limiting piece measuring sections parallel to the compensation direction, and arranging distance measuring sensors at positions corresponding to the limiting piece measuring sections; step 8, calibrating the distance relation between the hinge point of the process ball head and the gesture adjusting positioner and the vertical line along the compensation direction under the measuring field coordinate system; Step 9, measuring the