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Accelerometer vibration imbalance error evaluation method and device, storage medium and equipment

An accelerometer and error assessment technology, which is applied in the testing/calibration of speed/acceleration/shock measurement equipment, speed/acceleration/shock measurement, measurement devices, etc. The problem of high product technical risk has the effect of shortening development time, realizing low cost and reducing design risk.

Pending Publication Date: 2022-04-12
北京轩宇空间科技有限公司
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AI Technical Summary

Problems solved by technology

[0003] The traditional technical solution is to simulate the flight application conditions of the aircraft through the vibration table to verify the performance indicators of the inertial navigation system after the design of the inertial navigation system is completed. Because the traditional technical solution needs to be tested and verified after the design of the inertial navigation system is completed, the verification cycle is long. At the same time, it needs to spend a lot of manpower and financial resources, the product technology risk is high, and the requirements for designers are high

Method used

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  • Accelerometer vibration imbalance error evaluation method and device, storage medium and equipment
  • Accelerometer vibration imbalance error evaluation method and device, storage medium and equipment
  • Accelerometer vibration imbalance error evaluation method and device, storage medium and equipment

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Embodiment 1

[0055] Such as Image 6 As shown, the present embodiment provides a method for evaluating accelerometer vibration misalignment error, comprising the following steps:

[0056] (1) Based on the principle of random vibration, the input excitation of the accelerometer is established;

[0057] The random vibration signal is an indeterminate signal, which cannot be described by a definite mathematical relationship, but can only be described by a statistical method. It is impossible to predict the precise value at any moment in the future. Any observed value only represents the possible results within its range of variation, but the change of its value obeys statistical laws. A given random spectrogram contains all the information of the random signal, including the frequency range of random vibration, the energy value at each frequency of random vibration and the root mean square of random vibration acceleration. Therefore, random vibration can be used to measure the performance o...

Embodiment 2

[0088] This embodiment provides another accelerometer vibration misalignment error evaluation device, including:

[0089] Establish an input excitation module, which is used to establish an accelerometer input excitation based on the principle of random vibration, wherein the accelerometer tests are all carried out under a 1g gravity field;

[0090] Establishing an output model module for establishing an accelerometer vibration output model, and modeling the accelerometer output as a truncated normal distribution;

[0091] Accelerometer output obeys normal distribution X~N(μ, δ 2 ), and its probability density function is expressed as:

[0092]

[0093] Take the truncation interval (a,b), where a is the minimum value of the accelerometer output range, b is the maximum value of the accelerometer output range, and the probability density function of X is used by standard normal distribution probability density function and cumulative distribution by standardizing variables ...

Embodiment 3

[0108] This embodiment provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is run by a processor, the storage medium device is controlled to execute the accelerometer vibration imbalance error evaluation method of Embodiment 1.

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Abstract

The invention discloses an accelerometer vibration imbalance error evaluation method and device, a storage medium and equipment, and the method comprises the following steps: (1), building the input excitation of an accelerometer based on a random vibration principle; (2) establishing an accelerometer vibration output model, and modeling accelerometer output as truncation normal distribution; and (3) deriving expectation of truncation normal distribution according to the steps (1) and (2), and calculating the vibration imbalance error of the accelerometer. The evaluation device comprises an input excitation establishing module which is used for establishing accelerometer input excitation based on a random vibration principle; the output model building module is used for building an accelerometer vibration output model and modeling accelerometer output as truncation normal distribution; and the calculation module is used for calculating the vibration imbalance error of the accelerometer according to the expectation of deducing the normal distribution of the truncation form. The evaluation method can effectively reduce the design risk of the inertial navigation system, shorten the development time and improve the reliability of the inertial navigation system.

Description

technical field [0001] The present invention relates to the technical field of accelerometers, in particular to an accelerometer vibration imbalance error evaluation method, device, storage medium and equipment. Background technique [0002] The aircraft is affected by atmospheric fluctuations and its own engine vibration during flight. To ensure the attitude of the aircraft is stable, it is necessary to ensure that the inertial navigation system is not interfered by the above vibration signals and outputs effective attitude information. Accelerometer, as the main device for aircraft inertial navigation measurement, is sensitive to vibration information, and the output accuracy of accelerometer directly affects the accuracy of inertial navigation system. [0003] The traditional technical solution is to simulate the flight application conditions of the aircraft through the vibration table to verify the performance indicators of the inertial navigation system after the design...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/00
Inventor 张国兵段磊强钟秀峰宋文强高阳宋俊霞戴居峰
Owner 北京轩宇空间科技有限公司
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