A measuring method for large antenna assembly using laser and vision guiding technology

Peng, Gaoliang; Sun, Yu; Han, Rui; Li, Chuanhao; Liu, Shaohui

doi:10.1016/j.measurement.2016.06.020

Cited by 15 publications

(4 citation statements)

References 19 publications

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“…Actually, there are some effective methods for measuring the deformation and displacement in aircraft assembly. The laser tracker [3,5,6], laser radars [7,8] and iGPS [8,9] (indoor Global Positioning System) are widely used to gauge positions of multiple points in the aircraft components and assembly toolings to obtain their shapes and postures. Benoit and Bernard [10] integrated laser technology with visual system and computer-aided measurement to sense the status of the assembly parts.…”

Section: Introductionmentioning

confidence: 99%

Structural deformation and clamping force monitoring of reconfigurable tooling motivated by strain data in aircraft assembly

Li,

Hu,

Kang

et al. 2024

Smart Mater. Struct.

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The quality of aircraft assembly is mainly guaranteed by toolings which are vital to the geometrical accuracy and service performance of aviation products. In this research, a real-time monitoring system that determines the structural deformation and clamping force of reconfigurable toolings using strain data is developed to perceive the service state of the toolings. By laying fiber Bragg gratings on positioning beam and baseplate of the reconfigurable tooling, strain data of the tooling structures are gauged and transferred to curvatures. The beam and baseplate are modeled as one and two-dimensional objects respectively and shape reconstruction algorithms are established to obtain their deflection curve and surface using curvature information. Distribution of fibers is optimized to minimize the conversion error from strain to curvature. An estimation that reveals the mathematical relationship between the shape reconstruction error and measurement interval is implemented, and a mapping model from strains to clamping force of the beam is established. These algorithms are integrated into the self-developed monitoring software and undergo simulating and experimental tests. The maximum relative errors of deformation and force are 4.53% and 4.12% respectively in simulation, and 9.21% and 7.29% individually in experiment, which validates the efficiencies of the method. Tests of the monitoring system suggest that it can provide a timely and accurate sensing of the deformation and force of the tooling.

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Section: Introductionmentioning

confidence: 99%

Structural deformation and clamping force monitoring of reconfigurable tooling motivated by strain data in aircraft assembly

Li,

Hu,

Kang

et al. 2024

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Li et al improved Liu's method by acquiring images via coaxially distributed cameras and fitting the edges as ellipses, and then aligned the components by building and solving an optimization model via Particle Swarm Optimization (PSO) method [24]. Some other kinds of large parts, such as radar antennas and large frames were also assembled by using cameras, LDS, and inclination angle sensors [25]- [27].…”

Section: Introductionmentioning

confidence: 99%

A Coaxial Alignment Method for Large Flange Parts Assembly Using Multiple Local Images

Sun

Zhang

2021

IEEE Access

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The large flange parts in aero-engines are usually manually assembled. Collision damage caused by assembly alignment error often occurs in the assembly process, which affects the assembly accuracy and product reliability. The machine vision-based alignment methods usually achieve the highprecision measurement of the parts by obtaining the high-resolution images of the whole parts with a combination of laser distance sensors. Hence, existing methods are high costly and inefficient. In this paper, a new alignment method based on the principle of coaxial alignment for large flange parts is proposed. The proposed method first obtains multiple high-precision image pairs from the local field of views at the fitting surfaces of flanges. The clearance and bolt holes in each image pair are then extracted via edge recognition and Hough Transformation. Two optimization models are built to calculate the translation adjustment and rotation adjustment. The optimization model 1 is built with the translation adjustments of the flange as the variables and the consistency of the clearances as the objective function. The algorithm to solve the model based on the gradient-descent method is proposed. The positions of the bolt holes in the images are subsequently adjusted based on the translation adjustment, and the rotation adjustment is calculated by solving the built optimization model 2. The experiments show that the proposed method can be applied to the assembly process of large flange parts, and the visual servo control model based on this method also has good stability.

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“…Measurement technology of dynamic angles for large-space is widely used in the shipping, aerospace and satellite communication fields, where the assembly of shell equipment and the installation process of antennas frequently need to measure the angles of straight lines in different planes in a wide scope, ranging from a few meters to a dozen meters [1][2][3][4]. In addition, measure precision is crucial to the performance of the involved equipment.…”

Section: Introductionmentioning

confidence: 99%

Visual measurement method for large-space dynamic angles

Wang

Duan

et al. 2020

Meas. Sci. Technol.

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In this paper, we propose a measurement method for dynamic angles in large-space based on machine vision and servo control. The azimuth and pitch angles are obtained in real time by identifying and tracking a cooperative target in a high-precision servo system with a camera. Furthermore, the distance between the target and the camera is calculated by means of a monocular measurement. Based on the measured angles and distance, the dynamic angle of the rotating object in test is derived according to the transformational relations. In order to decrease measurement errors, an error correction model is established by the connection between the measurement distance and observation errors caused by the camera, dynamic tracking and pose changing of the target plate. A manual displacement platform with high precision in two-dimensions is conducted to validate the effectiveness of the proposed approach. The experimental results show that, compared with the existing measurement methods, the proposed method enlarges the measurement range of large-space angles to 18.788 m, and the measurement errors of the azimuth channel and pitch channel are 0.018° and 0.019°, respectively, which achieve a high measurement accuracy and verify the validity of the method.

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A measuring method for large antenna assembly using laser and vision guiding technology

Cited by 15 publications

References 19 publications

Structural deformation and clamping force monitoring of reconfigurable tooling motivated by strain data in aircraft assembly

Structural deformation and clamping force monitoring of reconfigurable tooling motivated by strain data in aircraft assembly

A Coaxial Alignment Method for Large Flange Parts Assembly Using Multiple Local Images

Visual measurement method for large-space dynamic angles

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