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A high-precision method for measuring the structural dimension deformation of spacecraft

A technology for the deformation of the structure and size of a spacecraft, which is applied to measurement devices, instruments, space navigation equipment, etc., can solve the problems of changing the refractive index of the air, increasing the error, and failing to achieve the accuracy of the sensor, so as to improve the accuracy, reduce the development cost, The effect of good production and scientific research benefits

Active Publication Date: 2022-06-21
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

[0004] (1) High-precision deformation is usually measured using optical sensors, and temperature changes will change the refractive index of the air and interfere with the measurement results of the sensor, that is, the thermal deformation measurement in the atmospheric environment, the sensor often cannot achieve its nominal accuracy;
[0005] (2) Drift phenomenon is inevitable in the ground measurement system, including the time drift of the sensor and the slow deformation of the tooling under the action of gravity, while the thermal deformation measurement lasts for a long time, and the temperature gradient load is used for quasi-static measurement. The time drift error of the superposition system, this error cannot be eliminated and the error continues to increase with the increase of measurement time;
[0007] (4) The high-precision spacecraft stability index is usually proposed in the form of frequency domain, and the deformation measurement using the temperature gradient step method cannot reflect the dynamic characteristics of the spacecraft structure, and cannot directly verify the design index

Method used

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  • A high-precision method for measuring the structural dimension deformation of spacecraft
  • A high-precision method for measuring the structural dimension deformation of spacecraft
  • A high-precision method for measuring the structural dimension deformation of spacecraft

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Embodiment 1

[0037] This embodiment provides a high-precision spacecraft structural dimension deformation measurement method, which adopts the cyclic loading method to perform high-precision deformation measurement, simulates the real pressure and temperature environment of the spacecraft in orbit, and uses the deformation time domain signal preprocessing and The spectral transformation method eliminates the measurement system error, and effectively improves the accuracy of the structural dimension deformation measurement.

[0038] like figure 1 As shown, the deformation measurement method includes the following steps:

[0039] Step 1. Build a deformation measurement system;

[0040] The deformation measurement system includes: a sensor fixing tool and a high-precision optical displacement sensor (such as a laser displacement sensor), and the optical displacement sensor is installed on the spacecraft through the sensor fixing tool to form a deformation measurement system;

[0041] In ord...

Embodiment 2

[0065] Step 1. Build a deformation measurement system based on a laser displacement sensor and a low-expansion quartz tool;

[0066] like figure 2 As shown, two laser displacement sensors are erected on the spacecraft structural plate through a quartz rod tooling, so that the two laser displacement sensors are respectively opposite to the targets at both ends of the spacecraft structural plate;

[0067] Step 2, carrying out the deformation measurement test in the vacuum tank, wherein, the pressure of the control vacuum tank is less than 1E-2Pa;

[0068] Step 3. The deformation measurement system is pre-tested in the vacuum tank with the spacecraft. The test time is 10 hours. During this period, the deformation measurement system continues to work. The measured result is the drift law of the deformation measurement system, which drifts monotonically and shows a convergence trend. , using a quadratic function to fit the drift law, the form of the quadratic function is:

[006...

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Abstract

The invention discloses a method for measuring the deformation of the structure size of a high-precision spacecraft, which relates to the technical field of aerospace precision measurement. It adopts a cyclic loading method for high-precision deformation measurement, and simulates the real pressure and temperature environment of the spacecraft on orbit. Time-domain signal preprocessing and spectrum transformation eliminate measurement system errors and effectively improve the accuracy of structural dimension deformation measurement.

Description

technical field [0001] The invention relates to the technical field of aerospace precision measurement, in particular to a method for measuring deformation of a high-precision spacecraft structure. Background technique [0002] Dimensional stability refers to the ability of a structure to maintain its own shape and size under the action of the external environment. In order to ensure that the main load of the high-resolution spacecraft works normally in orbit, the requirements for the dimensional stability of the structure are getting higher and higher. Taking the Earth's gravitational field detection satellite as an example, the micron-level deformation control requirements are put forward for the structure during the spacecraft's in-orbit operation. [0003] According to the spacecraft development process, in order to verify the product design, it is necessary to carry out ground test verification of the design indicators. Considering the complexity of the spacecraft stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16B64G7/00
CPCG01B11/16B64G7/00B64G2007/005
Inventor 赵震波罗文波赵云鹏蔡铮陈海峰杨洁张龙刘志全
Owner BEIJING INST OF SPACECRAFT SYST ENG
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