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CN-121980803-A - Quick construction optimization method for optical remote sensing satellite micro-vibration inhibition index system

CN121980803ACN 121980803 ACN121980803 ACN 121980803ACN-121980803-A

Abstract

The invention relates to the technical field of satellite system engineering and micro-vibration suppression, in particular to a method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system, which constructs a system-level frequency domain response model based on a frequency domain transfer function chain by acquiring an imaging quality index threshold value, a system static modulation transfer function value, a structure transfer function data set and a flywheel disturbance source characteristic data set, and calculating a modulation transfer function attenuation factor caused by high-frequency micro-vibration by using a zero-order Bessel function and a time delay integral smoothing function, establishing a reverse design inequality to solve a maximum disturbance force upper limit curve allowed by the flywheel under different rotation speed frequencies, and outputting a design parameter of the vibration isolation device or a flywheel model selection strategy by comparing the maximum disturbance force upper limit curve with a flywheel actual measurement disturbance spectrum. The invention solves the problems of low calculation efficiency and lack of parameter inverse solution capability of the existing time domain simulation, realizes millisecond-level rapid evaluation and direct design guidance, and obviously shortens the demonstration period of the satellite overall scheme.

Inventors

  • WU BINBIN
  • LIU FENG
  • WU TING

Assignees

  • 西安中科西光航天科技集团有限公司

Dates

Publication Date
20260505
Application Date
20260129

Claims (10)

  1. 1. The method for quickly constructing and optimizing the optical remote sensing satellite micro-vibration inhibition index system is characterized by comprising the following steps of: Step 1, acquiring an imaging quality index threshold, a system static modulation transfer function value, a structure transfer function data set and a flywheel disturbance source characteristic data set; step 2, inputting the flywheel disturbance source characteristic data set into a flywheel disturbance power spectrum link to obtain a flywheel disturbance power spectrum, inputting the flywheel disturbance power spectrum into a structure admittance function link to obtain a structure vibration response, inputting the structure vibration response into an optical sampling transfer function link to obtain a system-level frequency domain response model; step 3, converting the system-level frequency domain response model into image plane amplitude distribution, substituting the image plane amplitude distribution into a zero-order Bessel function to obtain a modulation transfer function attenuation component caused by vibration; Step 4, correlating the modulation transfer function attenuation factor caused by the high-frequency micro-vibration, the system static modulation transfer function value and the imaging quality index threshold value to construct a reverse design inequality; And step 5, comparing the maximum disturbance force upper limit curve with the actually measured disturbance spectrum of the flywheel, and outputting design parameters of the flywheel vibration isolation device or generating a flywheel model selection strategy according to a comparison result.
  2. 2. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 1, wherein the step 2 comprises the following steps: inputting the flywheel disturbance source characteristic data set into a flywheel disturbance power spectrum link to obtain a flywheel disturbance power spectrum; Inputting the flywheel disturbance power spectrum into a structural admittance function link, and calculating to obtain structural vibration response; Inputting the structural vibration response into an optical sampling transfer function link, and calculating to obtain a system-level frequency domain response model; the system-level frequency domain response model is equal to the product of the flywheel disturbance power spectrum link, the structure admittance function link and the optical sampling transfer function link.
  3. 3. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 2, wherein the step 3 comprises the following steps: Calculating image plane amplitude distribution through a frequency domain-space domain conversion relation according to the system-level frequency domain response model obtained in the step 2; substituting the image plane amplitude distribution as a variable into a zero-order Bessel function, and calculating to obtain a modulation transfer function attenuation component caused by vibration; And multiplying the modulation transfer function attenuation component caused by the vibration with the time delay integral smoothing function to obtain a modulation transfer function attenuation factor caused by the high-frequency micro-vibration.
  4. 4. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 3, wherein the step 4 comprises the following steps: selecting Nyquist space frequency as an evaluation frequency point; Multiplying the system static modulation transfer function value obtained in the step 1 with the modulation transfer function attenuation factor caused by the high-frequency micro-vibration obtained in the step 3 at the estimated frequency point to obtain a system actual modulation transfer function value; establishing a constraint condition that the actual modulation transfer function value of the system is not smaller than the imaging quality index threshold value acquired in the step 1; converting the constraint condition into a mathematical inequality with respect to flywheel disturbance force; and solving the mathematical inequality to obtain the maximum disturbance force upper limit curve allowed by the flywheel under different rotation speed frequencies.
  5. 5. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 4, wherein the outputting of the flywheel vibration isolation device design parameters in step 5 comprises: identifying a rotating speed frequency interval in which the amplitude value in the flywheel actually-measured disturbance spectrum exceeds the amplitude value corresponding to the maximum disturbance force upper limit curve obtained in the step 4; calculating the area difference value of the area surrounded by the actually measured disturbance spectrum curve of the flywheel and the maximum disturbance force upper limit curve in the rotating speed frequency interval; Determining the vibration attenuation amount required to be provided by the vibration isolator according to the area difference value; Calculating the cut-off frequency and damping ratio parameter combination of the vibration isolator according to the vibration attenuation; The flywheel model selection strategy generation comprises the steps of establishing a flywheel product database, comparing a flywheel actually measured disturbance spectrum in the database with the maximum disturbance force upper limit curve, and selecting the flywheel model with the whole course lower than the maximum disturbance force upper limit curve to form a recommended list.
  6. 6. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 5, wherein the step 1 of obtaining the flywheel disturbance source characteristic data set comprises the following steps: measuring disturbance forces generated by the flywheel at different rotating speeds in the whole life cycle to obtain a disturbance force measurement value sequence; Performing Fourier transform on the disturbance force measurement value sequence, and converting a time domain disturbance force signal into frequency domain flywheel disturbance force spectrum density distribution; And establishing a mapping relation database between the rotating speed frequency and the disturbance force amplitude according to the distribution of the flywheel disturbance force spectral density.
  7. 7. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 6, wherein the application of the time delay integral smoothing function comprises the following steps: reading a time delay integration series parameter and a detector row integration time parameter; Constructing a sampling function in the form of a sine ratio according to the time delay integration series parameter and the detector row integration time parameter; And multiplying the sampling function by the modulation transfer function attenuation component caused by the vibration to obtain a smoothed modulation transfer function attenuation component.
  8. 8. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 7, wherein solving the upper limit curve of the maximum disturbance force comprises: selecting a discrete frequency point set in the working rotating speed range of the flywheel; converting the mathematical inequality into a constraint condition at each frequency point in the set of discrete frequency points; adopting a dichotomy or Newton iteration method to numerically solve the maximum disturbance force value meeting the constraint condition at each frequency point; and connecting the maximum disturbance force values at all the frequency points through spline interpolation or linear interpolation to form a continuous maximum disturbance force upper limit curve.
  9. 9. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 8, wherein the generation of the flywheel type selection strategy comprises the following steps: Collecting actually measured disturbance spectrums of different types of flywheels under rated working conditions, and constructing a flywheel product performance database; Comparing the actually measured disturbance spectrum of each flywheel model in the flywheel product performance database with the maximum disturbance force upper limit curve obtained in the step 4 point by point; Calculating the coincidence percentage of the actually measured disturbance spectrum of each flywheel model below the maximum disturbance force upper limit curve at all rotating speed frequency points; and selecting the flywheel model with the conformity percentage reaching a preset threshold value, and generating a recommended model selection list.
  10. 10. The method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system according to claim 9, further comprising: establishing a design parameter optimization loop, wherein the single execution time of the loop is controlled to be in the millisecond order; When the comparison result in the step 5 shows that the actually measured disturbance spectrum of the flywheel exceeds the maximum disturbance force upper limit curve, adjusting structural rigidity parameters in the structural transfer function data set or unbalance parameters in the flywheel disturbance source characteristic data set; Re-executing the steps 2 to 5 by using the adjusted structure transfer function data set or the flywheel disturbance source characteristic data set; And repeating the adjustment and re-execution processes until the obtained flywheel vibration isolation device design parameters or flywheel model selection strategies meet the imaging quality index threshold requirements.

Description

Quick construction optimization method for optical remote sensing satellite micro-vibration inhibition index system Technical Field The invention relates to the technical field of satellite system engineering and micro-vibration suppression, in particular to a method for quickly constructing and optimizing an optical remote sensing satellite micro-vibration suppression index system. Background In the general scheme demonstration of the optical remote sensing satellite, the micro-vibration suppression index design technology manages micro-vibration generated by movable components in the satellite platform, such as a reaction wheel and a refrigerator, by setting vibration control standards, and the vibration interferes with the stability of an optical imaging system. The optical remote sensing satellite observes the earth from space by utilizing a high-precision optical instrument, and the imaging quality of the optical remote sensing satellite depends on strict control of a dynamic environment of a platform, so that a system-level dynamic modeling and simulation method is applied to a micro-vibration suppression index rapid distribution technology, vibration tolerance is distributed efficiently at the initial stage of a scheme, vibration isolation device configuration and structure optimization are guided, vibration transmission is reduced, remote sensing image definition is maintained, and performance balance and reasonable resource distribution in the overall design are supported. The existing optical remote sensing satellite micro-vibration suppression index design technology has the technical problems that the existing time domain simulation method is low in calculation efficiency based on a numerical integration principle, single simulation takes a long time of several hours, the full-rotation speed working condition of a flywheel is difficult to traverse, micro-vibration suppression index assessment is incomplete, meanwhile, the method lacks direct parameter inverse solution capability, only supports forward design, simulation and modified iterative processes, and the upper limit of the flywheel allowable disturbance cannot be quickly and reversely pushed from an imaging quality index such as MTF. For example, in the satellite population scheme demonstration stage, to meet the system MTF threshold requirement, engineers need to guess the flywheel imbalance multiple times and perform time-consuming simulations, the process is repeated and experience-dependent, the design cycle is prolonged, and the development cost is increased. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a rapid construction optimization method for an optical remote sensing satellite micro-vibration suppression index system, which solves the technical problems of long design period and high iteration cost of the optical remote sensing satellite micro-vibration suppression index due to low calculation efficiency and lack of direct parameter inverse solution capability of the existing time domain simulation method. In order to solve the technical problems, the invention comprises the following specific contents: the invention provides a rapid construction optimization method of an optical remote sensing satellite micro-vibration suppression index system, which comprises the following steps: Step 1, acquiring an imaging quality index threshold, a system static modulation transfer function value, a structure transfer function data set and a flywheel disturbance source characteristic data set; step 2, inputting the flywheel disturbance source characteristic data set into a flywheel disturbance power spectrum link to obtain a flywheel disturbance power spectrum, inputting the flywheel disturbance power spectrum into a structure admittance function link to obtain a structure vibration response, inputting the structure vibration response into an optical sampling transfer function link to obtain a system-level frequency domain response model; step 3, converting the system-level frequency domain response model into image plane amplitude distribution, substituting the image plane amplitude distribution into a zero-order Bessel function to obtain a modulation transfer function attenuation component caused by vibration; Step 4, correlating the modulation transfer function attenuation factor caused by the high-frequency micro-vibration, the system static modulation transfer function value and the imaging quality index threshold value to construct a reverse design inequality; And step 5, comparing the maximum disturbance force upper limit curve with the actually measured disturbance spectrum of the flywheel, and outputting design parameters of the flywheel vibration isolation device or generating a flywheel model selection strategy according to a comparison result. Further, the method for quickly constructing and optimizing the optical remote sensing satellite micro-vibration suppression index system compris