Method for analyzing and estimating precision of inertial device based on vibration performance

Abstract

The invention discloses a method for analyzing and estimating the precision of an inertial device based on the vibration performance. The method comprises the steps of acquiring full-spectrum information transmitted by vibration energy through a vibration source existing in the inertial device during working by analyzing the vibration performance of the vibration source and detecting the frequency spectrum, observing a coupling relation of all constituents in the inertial device according to the structural modes of all the constituents in the inertial device, and accurately calculating the constitution performance of the inertial device. The method is intuitive in characterization, easy to operate and high in detection precision; the precise service life estimation of the inertial device is effectively realized. The method is suitable for the precision estimation of any systems containing vibration excitation.

Description

technical field [0001] The invention relates to a method for evaluating the accuracy of inertial devices based on vibration performance analysis, in particular to a method for intuitively evaluating the microscopic state of the internal composition and working performance of the system through vibration spectrum analysis, which can be used for the working accuracy life and storage life of inertial devices evaluation of. The invention is applicable to any system accuracy evaluation containing vibration excitation, and belongs to the technical field of inertial devices. Background technique [0002] Inertial devices are complex electromechanical systems, and their performance depends on the accuracy of their components. To judge its performance, the error model adopted by the existing models mainly starts from the error items related to the input linear acceleration, angular position or angular rate and other related physical quantities, and establishes the error model for ea...

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Problems solved by technology

The disadvantage is that the criterion is single, and the influence of the coupling correlation of structural modal parameters formed by each structural component in the system on the performance of the structural component is not considered, especially when there is a vibration source inside the inertial device, the linear vibration acceleration and vibration angle generated by it Acceleration will form a vibration interference torque on the gyroscope and accelerometer on the inertial device. Due to the overlapping of the frequency spectrum of each structure, even the coupling and amplification of the modal parameters of each structure will form a resonance area, causing internal local resonance and vibration errors.

Because it is a micro-level vibration (about 0.001g ~ 0.01g), it is easy to ignore and cannot be completely isolated. However, the calibration of the working accuracy of inertial devices in the prior art is carried out under the condition of sensitive ground speed and gravity acceleration. Micro-vibration The impact on the output accuracy of inertial devices cannot be accurately calibrated in the accuracy calibration, and there will also be problems of poor output consistency under different test environments. Often, micro-vibration can only be detected from existing test methods after the vibration error has accumulated to a certain extent. The loss of accuracy caused by it is not easy to be found in the early stage, so there is a certain degree of uncertainty in the estimation and prediction of the accuracy life of inertial devices

[0003] In fact, as long as there is a vibration source inside, the coupling accuracy relationship between the structural components of the inertial device can be intuitively reflected in the energy transfer of the full frequency spectrum of its vibration. Now there is an urgent need for a method to solve the long-standing vibration of the complex electromechanical system due to structural components. The accuracy loss caused by coupling is difficult to evaluate and detect, so as to realize the test coverage and quantitative judgment of the working accuracy of the inertial device in the whole environment, improve the accuracy of the inertial device, and realize the estimation of the working accuracy and accuracy life of the inertial device

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