Method for monitoring deflection of bridge through integration of GNSS/accelerometer and MEMS-IMU

A technology of accelerometer and bridge deflection, which is applied in the direction of navigation through velocity/acceleration measurement, testing of machine/structural components, measuring devices, etc., and can solve the problem of less research on the consistency of integrated results

Pending Publication Date: 2021-04-30
CHINA UNIV OF MINING & TECH
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However, whether it is GNSS, GNSS/accelerometer integration, or GNSS/IMU integration when monitoring bridges, the existin

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  • Method for monitoring deflection of bridge through integration of GNSS/accelerometer and MEMS-IMU
  • Method for monitoring deflection of bridge through integration of GNSS/accelerometer and MEMS-IMU
  • Method for monitoring deflection of bridge through integration of GNSS/accelerometer and MEMS-IMU

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Embodiment Construction

[0075] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0076] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiment...

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Abstract

The invention discloses a method for monitoring the deflection of a bridge through integration of a GNSS/accelerometer and an MEMS-IMU. The method can achieve the reasonable weighting of an observation value of an inertial system according to the course and posture hard constraint of the MEMS-IMU and the output of a high-precision posture in a short time, gives consideration to the deformation characteristics of the bridge, fully mines non-integrity constraint information such as quaternion digital-analog constraints and course angle hard constraints, utilizes a constraint smooth variable structure filter to update, feed back and correct random drift errors of the MEMS-IMU device, utilizes noise information and error information to switch by adopting a saturation term forced estimation state at the upper bound of the errors, and updates in the upper and lower sliding mode surfaces by adopting error innovation so as to suppress modeling residual multipath errors and other unknown or unmodeled errors in the bridge monitoring environment; and consistency monitoring indexes based on state vectors such as rate and the like are constructed, and GNSS/accelerometer and MEMS-IMU fusion reliable monitoring is achieved.

Description

technical field [0001] The invention relates to the technical field of bridge health monitoring, in particular to a method for integrated GNSS / accelerometer and MEMS-IMU fusion monitoring of bridge deflection. Background technique [0002] Over the past 30 years, bridge construction in various regions has entered a period of rapid development, with more than 10,000 bridges being constructed each year. The outstanding problems at present are that the total amount of bridge construction is large, the period is short, there are many hidden dangers, and the aging of bridges in service is accelerating. Therefore, long-term real-time and accurate monitoring of bridge structural health is of great significance to ensure the safe operation of super-large bridges. [0003] In order to improve the frequency and accuracy of bridge monitoring by GNSS (Global Navigation Satellite System), many scholars have proposed the method of using multi-sensor integration. In recent years, the app...

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Application Information

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IPC IPC(8): G01M5/00G01C21/16G01S19/47
CPCG01C21/165G01M5/0008G01M5/005G01S19/47
Inventor 张秋昭孙澳刘振文张书毕郑南山孟晓林
Owner CHINA UNIV OF MINING & TECH
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