Near field phased array structure health monitoring method based on piezoelectric array

A technology for health monitoring and piezoelectric arrays, which is used in the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve problems such as monitoring distance limitations, suppress boundary reflections and other noises, improve signal-to-noise ratio, and overcome limitations.

Inactive Publication Date: 2015-02-25
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, the far-field ultrasonic phased array has certain limitations in the monitoring distance, so the study of the near-field ultrasonic phased array structural health monitoring method can make up for the limitation of the far-field ultrasonic phased array in the monitoring distance

Method used

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  • Near field phased array structure health monitoring method based on piezoelectric array
  • Near field phased array structure health monitoring method based on piezoelectric array
  • Near field phased array structure health monitoring method based on piezoelectric array

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Embodiment Construction

[0032] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] Such as figure 1 In the schematic diagram of the near-field phased array in the present invention shown, M piezoelectric sheets are sequentially marked with serial numbers 0 to M-1, and arranged linearly to form a piezoelectric array, with the straight line where the piezoelectric array is located as the x-axis, A Cartesian coordinate system is established with the position of the 0th piezoelectric film as the origin. The signal received at point P(r, θ) is the accumulation of the excitation signal excited by each piezoelectric plate after propagating in the structure, r is the distance from point P(r, θ) to the origin of coordinates, and θ is the distance from the origin of coordinates to The angle between the beam pointing at point P(r,θ) and the x-axis. Then the signal received at point P(r, θ) is:

[0034] ...

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Abstract

The invention discloses a near field phased array structure health monitoring method based on a piezoelectric array. The method comprises the following steps: arranging a piezoelectric linear array on a monitoring structure so as to obtain a damage scattering signal of each excitation-sensing channel, adding time delay to a damage signal, and determining the damage direction; and finally, determining the damage position according to a signal arrival moment t. With the adoption of the near field phased array structure monitoring method disclosed by the invention, micro damage in a complex structure can be identified, and the limitation of a far field phased array on the monitoring distance is overcome.

Description

technical field [0001] The invention belongs to the technical field of engineering structure health monitoring, and in particular relates to a piezoelectric array-based near-field phased array structure health monitoring method. Background technique [0002] Engineering structure health monitoring technology is used to monitor, diagnose and predict the state and failure of continuous operation engineering systems, ensure the safe operation of engineering equipment, and timely and accurately identify damage will be of great significance to ensure the safe operation of engineering systems and reduce or avoid catastrophic accidents . The health monitoring technology of aviation intelligent structures needs to monitor the structural status online in real time in the early stage of damage, identify the damage in the structure and accurately locate it, but most of the detection equipment is complex, costly, labor-intensive and time-consuming Material structures, such as composite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/11
Inventor 孙亚杰袁慎芳张永宏刘青山季赛
Owner NANJING UNIV OF INFORMATION SCI & TECH
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