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An Optimal Sensor Layout Method Based on ei and Step-by-Step Subtraction

A technology of sensor and subtraction method, which is applied in the direction of instruments, special data processing applications, electrical digital data processing, etc., and can solve the problems of low energy, large amount of calculation, information loss and other problems in the selection of measuring points

Inactive Publication Date: 2018-02-02
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effective independent method does not take into account the inhomogeneity of the structural mass distribution, and there may be situations where the energy of the selected measuring point is low and the information is lost
However, when the sequence method has many measuring points to be selected, the amount of calculation is relatively large.

Method used

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  • An Optimal Sensor Layout Method Based on ei and Step-by-Step Subtraction
  • An Optimal Sensor Layout Method Based on ei and Step-by-Step Subtraction
  • An Optimal Sensor Layout Method Based on ei and Step-by-Step Subtraction

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Embodiment Construction

[0038] This kind of sensor optimization layout method based on EI and step-by-step method of the present invention comprises the following steps:

[0039] 1) Obtain the modal vector matrix of the structure through finite element calculation, determine the number of monitoring mode shapes, and determine the number of sensor arrangements;

[0040] 2) Use the EI method to optimize the modal vector matrix, select initial measuring points to form an initial modal vector matrix, and the number of initial measuring points is n times the number of sensor arrangements; where n=2~7;

[0041] 3) Solving the confidence matrix MAC of the initial modal vector matrix, and seeking the maximum off-diagonal element max of the MAC matrix;

[0042] 4) After eliminating the kth degree of freedom of the initial modal vector matrix, find the (MAC ij ) k Matrix, and calculate its largest off-diagonal element d; where k is a natural number;

[0043] 5) Calculate the value of f(k)=max-d, delete the ...

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Abstract

The invention discloses a sensor optimization layout method based on EI and step-by-step subtraction method. The formula provided by the method can be directly used to calculate the optimal layout position of sensors of bridges with different structure types and different calculation spans. It is suitable for the technical field of bridge structure calculation and analysis. What the present invention obtains is a suboptimal solution. It can be known from the vibration theory that if the number of modes to be identified is m, then m sensors can meet the requirements of parameter identification. type matching considerations, so a suboptimal solution is acceptable.

Description

technical field [0001] The invention belongs to the technical field of calculation and analysis of bridge structures, and relates to a sensor optimization layout method, in particular to a sensor optimization layout method based on EI and step-by-step subtraction methods. Background technique [0002] As the span and scale of bridge structures become larger and larger, health monitoring of bridge structures under operating conditions is a hot issue worthy of research. In a bridge health monitoring system, sensors are the "eyes" of the entire system. Through the sensor system, the bridge health monitoring system can monitor the structure in real time and send back data to lay the foundation for follow-up work. Sensor optimization layout is one of the key issues in designing a structural health monitoring system, and it is the first step in realizing a bridge health monitoring system, which has a crucial impact on data collection. The sensor system itself is a "contradiction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 梁鹏贺敏李琳国温苏强李斌王晓光马旭明吴向男
Owner CHANGAN UNIV